Ion content, antioxidant enzyme activity and transcriptional response under salt stress and recovery condition in the halophyte grass Aeluropus littoralis
BMC Research Notes volume 15, Article number: 201 (2022)
In contrast to glycophytes, halophyte plants have evolved unique morphological and physiological mechanisms to deal with abiotic stress. This study presents the physiological responses of Aeluropus littoralis, a halophyte grass, to salt stress and recovery conditions on the molecular level.
Elemental analysis showed that Na+ concentration increased in the analyzed tissue during salt stress application, and declined at recovery condition. With the exception of root tissue, comparable trends of K+, Ca2+, and Mg2+ concentrations were observed (decreased during salt stress, increased during recovery). Salinity led to an increase in total chlorophyll (Chl), Chl a, and carotenoids content, while Chl b content decreased. The level of the proline amino acid associated with drought and salt stress was increased. Here APX, POD, and SOD activity were strongly detectable in roots and reduced later under recovery conditions. RT-qPCR revealed up-regulation of antioxidant genes at S1 and S3 in the root but down-regulation in recovery conditions. This study found a significant halophyte index for understanding the processes of salinity tolerance in A. littoralis. These findings may provide insight into the role of antioxidant enzymes during salt stress and the mechanism underlying the plant's response to stress.
In modern agriculture, salt stress is one of the most important abiotic stressors that threatens crop growth and development . Due to increasing global demand for food, agricultural expansion to salt-affected areas is inevitable . Therefore, the development of salinity tolerant crops is crucial for global food security [3, 4]. To achieve this goal, it is necessary to understand the effects of high salinity on plant morphology, physiological processes, biochemical and metabolic responses, as well as gene expression [5, 6].
Halophytes represent an interesting example of a stress-tolerant plant [7, 8]. Halophytic plants have evolved a diverse set of adaptation strategies and tolerance mechanisms to survive in most extreme saline habitats [1, 9]. Crop improvement in terms of salinity and drought tolerance necessitates the application of halophyte research findings [10, 11]. The genetic potential of halophytic Poaceae can be used to improve glycophyte crops by identifying novel salt-responsive promoters and/or genes based on these resources [12,13,14].
In order to improve the knowledge on the adaptability of halophytes to salt stress, the physiological and molecular response of Aeluropus littoralis as a monocotyledonous halophyte model was evaluated under salt stress (600 mM NaCl treatment) and recovery conditions. Traits related to photosynthesis (Chl a, Chl b, and the total Cars), ion contents (Na+, K+, Ca2+, and Mg2+), and antioxidant enzyme activity (SOD, CAT, POD, and APX) were investigated in this study. On the molecular level, the mRNA abundance of AlSOD, AlCAT, and AlAPX genes at different time-points of salt stress and recovery conditions was analyzed and described.
Plant material and treatments
To ensure the uniformity of plants in this study, the cuttings of one mother plant of A. littoralis were collected from Isfahan province (32° 33′ 03.5"N 52° 29′ 31.3"E) were used in this study. Aeluropus plants were identified by Dr. Seyed Hassan Zali, and A specimen of the analyzed plants was deposited at the herbarium GAT under voucher number 70486. The growth conditions of Aeluropus seedlings were adjusted according to Fatemi et al. . (Additional file 1: Fig. S1). At the end of the sixth passage, the shoot and root samples were collected at 6 h (S1), 48 h (S2), and after one week (S3). The salt-treated plants were transferred to a sodium chloride-free Hoagland's solution and further cultivated, designated as a recovery condition. The samples for recovery conditions were collected after 6 h (R1), 48 h (R2), and one week (R3) (Additional file 2: Fig. S2).
Physiological, Ion content and antioxidant enzyme activity measurement
Chlorophyll (Chl) a, Chl b, and the total carotenoids (Cars) were extracted from aerial tissue using methanol, and the absorbance of the extract was measured at 665.2, 652.4, and 470 nm  using the Biochrom WPA Biowave II spectrophotometer. For elemental analysis, plant material was dried at 65 °C for 48 h, and its dry weight was recorded. Samples (three biological replications) were digested in 70% nitric acid and 30% hydrogen peroxide for 2.5 h at 120 °C, and then the elements of Na+, K+, Ca2+, and Mg2+were measured by ICP-OES.
Total protein and ROS scavenging enzymes were purified from root and leaf samples according to Kaur et al. 2016 procedures . Total soluble proteins were measured by the Bradford assay. The activity of SOD (EC 184.108.40.206) was measured using the reduction of nitro blue tetrazolium (NBT) . CAT (EC 220.127.116.11) activity was assayed based on the decomposition of H2O2 . The APX (EC 18.104.22.168) was assayed according to the method described by Nakano and Asada . Assays of POD (EC 22.214.171.124) activity were carried out using guaiacol as the hydrogen donor .
Total RNAs were extracted using Threezol reagent (Riragene company, Iran). The quality and quantity of RNA samples were estimated by Nanodrop spectrophotometer (Biochrom WPA Biowave II, UK). The sequences of CAT, SOD, cAPX, and pAPX as target genes and actin as a reference gene were obtained from the nucleotide database at NCBI. Primers of target and reference genes (except for APXs) were designed using Primer 3 software . The gene-specific primers for two isoforms of cytosolic and peroxisomal APX were designed with the AlleleID v7.0 software (Premier, CA). A taxa-specific/cross-species assay was conducted with aligned sequences of various APX, which could detect cAPX or pAPX only (Table 1). The RT-qPCR was accomplished in the CFX96 real-time PCR instrument (Bio-Rad) according to Hashemi et al. [22, 23]. The specificity of primers was checked by melt curve analysis (Additional file 3: Fig. S3). RT-qPCR data were analyzed according to Livak and Schmittgen method .
Results and discussion
Changes in chlorophyll and carotenoids content
The content of Chl a increased sharply at 48 h during the salt stress treatment and then decreased significantly at the end of the salt stress treatments (Fig. 1A). Chl abundance during the recovery condition tends to return to control levels without reaching this initial value. In contrast, a significant increase in Chl b content (Fig. 1B) and subsequent Chl (a+b)/Cars ratio (Fig. 1F) were observed at S3 and R2 time-points (p-value < 0.01). A significant difference was observed in the Chl a/Chl b ratio between the R1 time-point and others (Fig. 1D).
The Cars quantity showed a strong dynamic response to the stress conditions (Fig. 1E). The Chl (a+b) content increased over the entire stress treatment compared to control (Fig. 1C). Chl and Cars as a key photosynthetic pigments perform vital physiological functions and photosynthetic processes in plants . A recent literature review shows that the effect of salinity stress on photosynthetic pigments is highly complex and plant-specific . In this study, the levels of light-harvesting pigments (Chl) were not equally sensitive to salt stress and recovery conditions (Fig. 1). The reduction of Chl a abundance one week after the salt stress could be attributed to the inhibition of chlorophyll biosynthesis and/or the stimulation of chlorophyll degradation . On the other hand, plants under salt stress (S3) and recovery condition (R2) had more Chl b content than Chl a. Our finding is in agreement with the described inter-conversion of Chl a and Chl b in the chlorophyll cycle, which occurs via 7-hydroxymethyl chlorophyll . In general, understanding the optimization of leaf function under salt stress condition requires more investment in leaf resources in light-harvesting than energy processing. Our finding might indicate the optimization of the halophytes to withstand salinity stress. Contrary to several previous findings [29, 30], the present study showed that the levels of Chl a and Chl b (except R2) were not restored in stressed plants following recovery.
The most important factor here is the detection of sodium ions, as they reflect the amount of salt taken up from the soil. As A. littoralis is able to secrete salt through its salt glands, the level of detected sodium ions is a proxy for the level of in vivo salt stress in the respective tissue. Na+ levels in salt-stressed plants increased in the S2 and S3 time-points and decreased in the R2 and R3 conditions (Fig. 1G). The most variation in Na+ concentration was observed in root tissue by the highest and lowest levels of Na+ in salt stress and recovery conditions, respectively. In contrast, K+ accumulation in leaves and stems decreased during salt stress and increased during recovery (Fig. 1H). An increase in the ratio of Na+/K+ was observed in S2 and S3, while the decreasing trend was seen in recovery conditions (Fig. 1K). Ca2+ content significantly declined in leaf, root, and stem during salt stress compared to control, whereas it increased significantly in leaf and stem during the recovery condition (Fig. 1I). The trend of the Na+/Ca2+ ratio was similar to the Na+/K+ ratio with a minor difference (Fig. 1L). Mg2+ concentration gradually decreased during salt stress and gradually increased after transferring to recovery conditions (Fig. 1J).
High concentrations of Na+ decrease the amount of available K+, Mg2+ and Ca2+ by displacing membrane-bound Ca2+ . Furthermore, Na+ may interfere with K+'s function as a cofactor, resulting in a direct toxic effect . In our experiments, the absorption of Na+ and K+ seemed to be competitive processes. The Na+ concentrations increased mainly in stress conditions, while K+ concentrations were reduced, especially in the roots and stem. This phenomenon occurred because halophytes needed fewer K+ than glycophytes for growth , confirming the capability to substitute K+ with Na+ and finally salt tolerance. This is also the case that was reported by Belkheiri and Mulas (2013) in Atriplex halimus . Even though salt stress causes damage to plants, the post-stress response is vital for recovery and survival. A previous report has described the recovery conditions allowed for the removal of salt-induced ion toxicity by reducing Na+ accumulation and increasing K+, Ca2+, and Mg2+ concentrations . Other studies have found a decrease in oxidative damage and harmful ion accumulations .
Proline, total protein and ROS enzyme activities
Total protein levels in salt-stressed plants and recovery conditions were significantly lower than in controls in both leaves and roots (Fig. 2A). In our study, proline content increased during salt treatment. Proline accumulation was described as its adaptive advantage under stress conditions . Proline content was significantly increased during salt stress, but decreased in recovery conditions (Fig. 2B). Antioxidant enzyme activity also tended to increase in salt stress during different time-points, but decreased in those recovery conditions (Fig. 2C–F). These changes in proline and activity of antioxidant enzymes suggest that both are affected by salt stress conditions and might play an important role in adaptation to salinity-induced oxidative stress. As described in other studies, antioxidant enzyme related genes respond to salt stress treatment . The CAT activity was higher in the recovery condition than in control and stress conditions in the leaf (Fig. 2D). SOD activity increased in both leaves and roots compared to the control (Fig. 2C). Stress conditions caused a profound increase in SOD activity to its maximum level at the S3 time-point, but it suddenly reduced in recovery condition in the leaf. The response of investigated enzymes was variable at different times of salinity and recovery conditions.
ROS are known as cytotoxic compounds that have important roles in homeostasis and cell signaling, which activates antioxidant defense mechanisms [38, 39]. There was a difference between CAT and SOD activity with salinity increasing and duration. The different changes for CAT and SOD activity indicated the importance of SOD rather than CAT in oxidative damage as the stress-time duration extended. The increasing changes of APX activity in the leaf during stress conditions showed that the highest APX activity occurred at the S3 time-point (Fig. 2E). POD activity increased significantly in stressed plants up to the highest level at the S3 time-point, while it decreased in the recovery condition in both leaf and root (Fig. 2F). The activities of SOD and POD in leaves showed similar trends. The decreases in CAT, APX and SOD activities could be attributed to ROS accumulation to toxic levels .
The AlSOD and AlCAT gene expressed similarly in leaf and root tissues. (Fig. 2G, H). The transcript levels of AlCAT in the leaves were consistent with CAT activities at different time-points, suggesting that CAT might be the main H2O2-scavenging enzyme to keep the balance of redox reactions in A. littoralis. The pattern of AlcAPX transcript level was highly similar to that of AlSOD mRNA, both in leaves and roots (Fig. 2I). The pattern of AlpAPX transcript levels in roots and leaves indicated an increase during salt application and a strong reduction during the recovery phase (Fig. 2J). APX isoforms of plants are found in chloroplasts, mitochondria, peroxisomes, cytosols and apoplasts . The changes in transcript levels of AlAPX were not consistent with the APX activity, neither in leaf nor root, under stress and recovery conditions. From these results, the expressions of AlAPX and AlSOD were suppressed during the salinity-caused accumulation of H2O2. Similar results have been reported for rice . This indicates a similar regulation via a common regulatory hub or transcription factor. Overexpression of antioxidant genes such as SOD, APX, and CAT was reported in wheat , Arabidopsis  and oat . Our knowledge of the physiological mechanisms behind plants' responses to recovery is inadequate at this time. As evidenced by changes in chlorophyll fluorescence and oxidative stress indices, Aeluropus plants might perceive the recovery phase as a new stress condition.
In conclusion, rising soil salinity is one of the most significant problems to agricultural productivity worldwide [46, 47]. However, the severity and period of stress have a significant impact on the composition and quantities of leaf photosynthetic pigments, elemental, and antioxidant enzymes, further research is needed to have a better knowledge of how salinity stress affects different species . Moreover, a precise assessment of these traits would allow for the presentation of plant health as well as an indirect reflection of stress response. Findings of this study point to some specific characteristics of A. littoralis in response to ROS accumulation and oxidative stress. These results demonstrated important indices of halophyte describing salinity tolerance mechanisms in A. littoralis.
Due to missing A. littoralis complete genomic data, only small number of genes were selected for RT-qPCR expression analyses.
Availability of data and materials
A specimen of the analyzed plants was deposited by Dr. Markus kuhlmann at the Gatersleben herbarium (GAT) of the IPK under voucher number 70486. The datasets measured and analyzed during the study are available from the corresponding author upon reasonable request.
Reactive oxygen species
- K+ :
- Ca2+ :
- Mg2+ :
- O2 •− :
- H2O2 :
- 1O2 :
National center for biotechnology information
Coupled plasma optical emission spectrometer
Isayenkov SV, Maathuis FJ. Plant salinity stress: many unanswered questions remain. Front Plant Sci. 2019;10:80.
Munns R, Day DA, Fricke W, Watt M, Arsova B, Barkla BJ, Bose J, Byrt CS, Chen ZH, Foster KJ. Energy costs of salt tolerance in crop plants. New Phytol. 2020;225:1072–90.
Dhankher OP, Foyer CH. Climate resilient crops for improving global food security and safety. Plant Cell Environ. 2018;41:877–84. https://doi.org/10.1111/pce.13207.
Zribi OT, Barhoumi Z, Kouas S, Ghandour M, Slama I, Abdelly C. Insights into the physiological responses of the facultative halophyte Aeluropus littoralis to the combined effects of salinity and phosphorus availability. J Plant Physiol. 2015;189:1–10.
Zhao C, Zhang H, Song C, Zhu J-K, Shabala S. Mechanisms of plant responses and adaptation to soil salinity. Innovation. 2020;1: 100017.
Saad RB, Romdhan WB, Zouari N, Azaza J, Mieulet D, Verdeil J-L, Guiderdoni E, Hassairi A. Promoter of the AlSAP gene from the halophyte grass Aeluropus littoralis directs developmental-regulated, stress-inducible, and organ-specific gene expression in transgenic tobacco. Transgenic Res. 2011;20:1003–18.
Fatemi F, Hashemi-Petroudi SH, Nematzadeh G, Askari H, Abdollahi MR. Exploiting differential gene expression to discover ionic and osmotic-associated transcripts in the halophyte grass Aeluropus littoralis. Biol Proced Online. 2019;21:1–16.
Ben-Romdhane W, Ben-Saad R, Meynard D, Zouari N, Mahjoub A, Fki L, Guiderdoni E, Al-Doss A, Hassairi A. Overexpression of AlTMP2 gene from the halophyte grass Aeluropus littoralis in transgenic tobacco enhances tolerance to different abiotic stresses by improving membrane stability and deregulating some stress-related genes. Protoplasma. 2018;255:1161–77.
Rancic D, Pecinar I, Acic S, Stevanovic ZD: 10 Morpho-anatomical traits of halophytic species. In: Halophytes and climate change: adaptive mechanisms and potential uses 2019; 152. https://doi.org/10.1079/9781786394330.0152
Panda A, Rangani J, Parida AK. Physiological and metabolic adjustments in the xero-halophyte Haloxylon salicornicum conferring drought tolerance. Physiol Plant. 2021;172:1189–211.
Saad RB, Zouari N, Ramdhan WB, Azaza J, Meynard D, Guiderdoni E, Hassairi A. Improved drought and salt stress tolerance in transgenic tobacco overexpressing a novel A20/AN1 zinc-finger “AlSAP” gene isolated from the halophyte grass Aeluropus littoralis. Plant Mol Biol. 2010;72:171–90.
Zouari N, Saad RB, Legavre T, Azaza J, Sabau X, Jaoua M, Masmoudi K, Hassairi A. Identification and sequencing of ESTs from the halophyte grass Aeluropus littoralis. Gene. 2007;404:61–9.
Ben Saad R, Fabre D, Mieulet D, Meynard D, Dingkuhn M, et al. Expression of the Aeluropus littoralis AlSAP gene in rice confers broad tolerance to abiotic stresses through maintenance of photosynthesis. Plant, Cell Environ. 2012;35:626–43.
Hashemi SH, Arab M, Dolatabadi B, Kuo YT, Baez MA, Himmelbach A, Nematzadeh G, Maibody SA, Schmutzer T, Mälzer M, Altmann T. Initial description of the Genome of Aeluropus littoralis, a halophile grass. Front Plant Sci. 2022. https://doi.org/10.21203/rs.3.rs-53457/v2.
Lichtenthaler HK, Buschmann C. Chlorophylls and carotenoids: Measurement and characterization by UV-VIS spectroscopy. In: Wrolstad RE, Acree TE, An H, Decker EA, Penner MH, Reid DS, Schwartz SJ, Shoemaker CF, Sporns P, editors. Current protocols in food analytical chemistry. New York: John Wiley and Sons; 2001.
Kaur N, Dhawan M, Sharma I, Pati PK. Interdependency of reactive oxygen species generating and scavenging system in salt sensitive and salt tolerant cultivars of rice. BMC Plant Biol. 2016;16:1–13.
Beauchamp C, Fridovich I. Superoxide dismutase: improved assays and an assay applicable to acrylamide gels. Anal Biochem. 1971;44:276–87.
Aebi H. Catalase in vitro. Methods Enzymol. 1984;105:121–6.
Nakano Y, Asada K. Hydrogen peroxide is scavenged by ascorbate-specific peroxidase in spinach chloroplasts. Plant cell physiol. 1981;22:867–80.
Hammerschmidt R, Nuckles E, Kuć J. Association of enhanced peroxidase activity with induced systemic resistance of cucumber to Colletotrichum lagenarium. Physiol Plant Pathol. 1982;20:73–82.
Rozen S, Skaletsky H. Primer3 on the WWW for general users and for biologist programmers. In: Misener S, Krawetz SA, editors. Bioinformatics methods and protocols, vol. 132. Totowa: Humana Press; 2000. p. 365–86.
Hashemipetroudi SH, Nematzadeh G, Ahmadian G, Yamchi A, Kuhlmann M. Assessment of DNA contamination in RNA samples based on ribosomal DNA. JoVE. 2018. https://doi.org/10.3791/55451.
Hashemi SH, Nematzadeh G, Ahmadian G, Yamchi A, Kuhlmann M. Identification and validation of Aeluropus littoralis reference genes for quantitative real-time PCR normalization. J Biol Res Thessaloniki. 2016;23:1–13.
Livak KJ, Schmittgen TD. Analysis of relative gene expression data using real-time quantitative PCR and the 2− ΔΔCT method. Methods. 2001;25:402–8.
Wang Y, Hu X, Jin G, Hou Z, Ning J, Zhang Z. Rapid prediction of chlorophylls and carotenoids content in tea leaves under different levels of nitrogen application based on hyperspectral imaging. J Sci Food Agric. 2019;99:1997–2004.
Mbarki S, Sytar O, Cerda A, Zivcak M, Rastogi A, He X, Zoghlami A, Abdelly C, Brestic M. Strategies to mitigate the salt stress effects on photosynthetic apparatus and productivity of crop plants. In: Kumar V, Wani SH, Suprasanna P, Tran LS, editors. Salinity responses and tolerance in plants, vol. 1. Cham: Springer; 2018. p. 85–136.
Yang C-M, Chang I, Lin S-J, Chou C-H. Effects of three allelopathic phenolics on chlorophyll accumulation of rice (Oryza sativa) seedlings: II. Stimulation of consumption-orientation. Bot Bull Acad Sin. 2004;45:119–25.
Tanaka A, Ito H, Tanaka R, Tanaka NK, Yoshida K, Okada K. Chlorophyll a oxygenase (CAO) is involved in chlorophyll b formation from chlorophyll a. Proc Natl Acad Sci USA. 1998;95:12719–23.
Parvin K, Hasanuzzaman M, Bhuyan M, Nahar K, Mohsin SM, Fujita M. Comparative physiological and biochemical changes in tomato (Solanum lycopersicum L.) under salt stress and recovery: role of antioxidant defense and glyoxalase systems. Antioxidants. 2019;8:350.
Acosta-Motos J-R, Diaz-Vivancos P, Alvarez S, Fernández-García N, Sanchez-Blanco MJ, Hernández JA. Physiological and biochemical mechanisms of the ornamental Eugenia myrtifolia L. plants for coping with NaCl stress and recovery. Planta. 2015;242:829–46.
Cramer GR, Läuchli A, Polito VS. Displacement of Ca2+ by Na+ from the plasmalemma of root cells: a primary response to salt stress. Plant Physiol. 1985;79:207–11.
Khan MA, Ungar IA, Showalter AM. Effects of salinity on growth, water relations and ion accumulation of the subtropical perennial halophyte Atriplex griffithii var. stocksii. Ann Bot. 2000;85:225–32.
Marschner H. Mineral nutrition of higher plants. 2nd ed. London: Academic Press; 1995.
Belkheiri O, Mulas M. The effects of salt stress on growth, water relations and ion accumulation in two halophyte Atriplex species. Environ Exp Bot. 2013;86:17–28.
Cavalcanti FR, Lima JPMS, Ferreira-Silva SL, Viégas RA, Silveira JAG. Roots and leaves display contrasting oxidative response during salt stress and recovery in cowpea. J Plant Physiol. 2007;164:591–600.
Lei C, Chang Y. Effects of NaCl and Na2CO3 stress on growth and physiological indexes in’Beta’grafted’Red Globe’grape seedlings. J GanSu Agr Univ. 2012;44:50–5.
Shafi A, Zahoor I, Mushtaq U: Proline accumulation and oxidative stress: Diverse roles and mechanism of tolerance and adaptation under salinity stress. In: Salt Stress, Microbes, and Plant Interactions: Mechanisms and Molecular Approaches. Springer; 2019: 269–300. https://doi.org/10.1007/978-981-13-8805-7_13
Neill SJ, Desikan R, Clarke A, Hurst RD, Hancock JT. Hydrogen peroxide and nitric oxide as signalling molecules in plants. J Exp Bot. 2002;53:1237–47.
Verma G, Srivastava D, Tiwari P, Chakrabarty D: ROS modulation in crop plants under drought stress. In: Reactive oxygen, nitrogen and sulfur species in plants: Production, metabolism, signaling and defense mechanisms 2019:311–336. https://doi.org/10.1002/9781119468677.ch13
Jiang M, Zhang J. Water stress-induced abscisic acid accumulation triggers the increased generation of reactive oxygen species and up-regulates the activities of antioxidant enzymes in maize leaves. J Exp Bot. 2002;53:2401–10.
Pitzschke A, Forzani C, Hirt H. Reactive oxygen species signaling in plants. Antioxid Redox Signal. 2006;8:1757–64.
Yin G, Xin X, Song C, Chen X, Zhang J, Wu S, Li R, Liu X, Lu X. Activity levels and expression of antioxidant enzymes in the ascorbate–glutathione cycle in artificially aged rice seed. Plant Physiol Biochem. 2014;80:1–9.
Melchiorre M, Robert G, Trippi V, Racca R, Lascano HR. Superoxide dismutase and glutathione reductase overexpression in wheat protoplast: photooxidative stress tolerance and changes in cellular redox state. Plant Growth Regul. 2009;57:57.
Li L, Yi H. Effect of sulfur dioxide on ROS production, gene expression and antioxidant enzyme activity in Arabidopsis plants. Plant Physiol Biochem. 2012;58:46–53.
Kong L, Huo H, Mao P. Antioxidant response and related gene expression in aged oat seed. Front Plant Sci. 2015;6:158.
Ben-Saad R, Ben-Ramdhan W, Zouari N, Azaza J, Mieulet D, Guiderdoni E, Ellouz R, Hassairi A. Marker-free transgenic durum wheat cv. Karim expressing the AlSAP gene exhibits a high level of tolerance to salinity and dehydration stresses. Mol Breeding. 2012;30:521–33.
Barhoumi Z, Djebali W, Chaïbi W, Abdelly C, Smaoui A. Salt impact on photosynthesis and leaf ultrastructure of Aeluropus littoralis. J Plant Res. 2007;120:529–37.
Shah SH, Houborg R, McCabe MF. Response of chlorophyll, carotenoid and SPAD-502 measurement to salinity and nutrient stress in wheat (Triticum aestivum L). Agronomy. 2017;7:61.
We are grateful to all members of Genetic and Agricultural Biotechnology Institute of Tabarestan (GABIT), Sari Agricultural Sciences and Natural Resources University (SANRU) for their helpful discussion and technical assistance.
This research was supported by the Genetics and Agricultural Biotechnology Institute of Tabarestan (GABIT), Sari Agricultural Sciences and Natural Resources University (SANRU).
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. The salt stress and recovery condition of A. littoralis and their growth parameters.
Checking the primers specificity by melt curve analysis.
A leaf surface of A. littoralis plants grown at different watering regimes (left: Hoagland solution, and right: On the leaves of a stressed plant, salt gland secretions were visible in the form of salt crystals.
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Hashemipetroudi, S.H., Ahmadian, G., Fatemi, F. et al. Ion content, antioxidant enzyme activity and transcriptional response under salt stress and recovery condition in the halophyte grass Aeluropus littoralis. BMC Res Notes 15, 201 (2022). https://doi.org/10.1186/s13104-022-06090-4
- Salt stresses
- Superoxide dismutase
- Ascorbate peroxidase
- Elemental analysis