Potential effects of Grapevine leafroll-associated virus 3 (genus Ampelovirus; family Closteroviridae) or Grapevine red blotch virus (genus Grablovirus; family Geminiviridae) infection on foliar phenolic and amino acid levels

Table 1 Summary of ANOVA and MANOVA results for effects on different grapevine compound classes

Virus	Compound	Factor	F	P	Effects
GLRaV-3	Total phenolics	Infection status	0.936	0.337
		Month	0.631	0.535
		Year	2.828	0.097
		Rootstock	3.772	0.029	101-14MGt > Freedom, St. George
	Total flavonoids	Infection status	0.091	0.764
		Month	6.439	0.003	Sept > May, July
		Year	0.008	0.928
		Rootstock	3.918	0.024	101-14MGt > Freedom, St. George
		Year × month	4.756	0.012
	Total hydroxycinnamic acids	Infection status	6.367	0.014	Healthy > Infected
		Month	33.399	< 0.001	July > May, Sept
		Year	39.693	< 0.001	2019 > 2018
		Rootstock	1.442	0.243
		Year × month	29.894	< 0.001
		Month × rootstock	2.719	0.039
	Total amino acids	Infection status	5.25	0.025	Infected > Control
		Month	62.178	< 0.001	Sept > May > July
		Year	2.63	0.109
		Rootstock	1.95	0.15
		Year × month	34.302	< 0.001
		Month × rootstock	3.398	0.013
		Rootstock × infection	5.243	0.008
		Year × rootstock × infection	4.85	0.011
GRBV	Total phenolics	Infection status	4.218	0.045	Healthy > Infected
		Month	8.76	0.001	July, Sept. > May
		Year	32.917	< 0.001	2019 > 2018
		Rootstock	14.879	< 0.001	101-14MGt > St. George
		Year × month	5.357	0.008
	Total flavonoids	Infection status	2.313	0.135
		Month	6.19	0.004	July, Sept. > May
		Year	22.915	< 0.001	2019 > 2018
		Rootstock	15.798	< 0.001	101-14MGt > St. George
		Year × month × rootstock	3.372	0.043
	Total hydroxycinnamic acids	Infection status	5.08	0.029	Healthy > Infected
		Month	30.044	< 0.001	July > May, Sept
		Year	25.568	< 0.001	2019 > 2018
		Rootstock	2.704	0.104
		Year × month	37.249	< 0.001
	Total amino acids	Infection status	0.757	0.389
		Month	10.008	< 0.001	Sept. > May, July
		Year	2.636	0.111
		Rootstock	0.096	0.758
		Year × month	8.787	0.001
		Month × rootstock	10.274	< 0.001

Interaction statistics are provided only for interactions that were significant (P < 0.05). For GLRaV-3, N = 106 or 107. For GRBV, N = 72

ISSN: 1756-0500