Table 2.

NO-dependent changes in the expression of genes related to ABA metabolism and signalling in seeds or siliques.

	Gene	Changes in Gene Expression	Plant Material	General Description of the Material and Results	References
Biosynthesis	NCED6	↑/↓	Hedge mustard seeds	Upregulated at 3 h and downregulated at 22 and 26 h of imbibition of non-after-ripened seeds in 20 mM KNO3.	[83]
	NCED9			Upregulated at 12 h and downregulated at 22 and 26 h of imbibition of non-after-ripened seeds in 20 mM KNO3.
	NCED5	↑	Hedge mustard seeds	Among tested NCED, NCED5 expression the highest during imbibition of 7-month after-ripened seeds and the most affected by 20 mM KNO3.	[88]
	NCED6			Stimulated by 20 mM KNO3 only between 22 and 26 h of imbibition of 7-months after-ripened seeds.
	NCED9
	NCED3	↓	Apple seeds	Downregulated in axes of embryos after 3 h of fumigation with vapours of acidified 20 mM NaNO2.	[84]
	NCED9
Degradation	CYP707A2	↑	Arabidopsis seeds	Increased between 3 and 48 h of imbibition after 200 µM SNP application.	[89]
	CYP707A1	↓	Arabidopsis siliques	Downregulated at 15, 19, and 22 d after flowering and was higher in siliques from a mother plant treated with 10 mM NO3− compared to the plant treated with 3 mM NO3−.	[80]
	CYP707A2	↑		Increased at 19 and 22 d after flowering and was higher in siliques from a mother plant treated with 10 mM NO3− compared to the plant treated with 3 mM NO3−.
	CYP707A2	↑	Hedge mustard seeds	Upregulated between 3 and 22 h of imbibition of non-after-ripened seeds in 20 mM KNO3.	[83]
	CYP707A2	↑	Hedge mustard seeds	Increased between 3 and 26 h of imbibition of 7-months after-ripened seeds in 20 mM KNO3.	[88]
	CYP707A1	=	Apple seeds	Observed in axes of embryos after 3 h of fumigation with vapours of acidified 20 mM NaNO2.	[84]
	CYP707A2	↓
Signalling	RCAR3	↑	Apple seeds	Observed in axes of embryos after 3 h of fumigation with vapours of acidified 20 mM NaNO2.	[84]
	ABF	↓
	ABI5	↑/↓	Hedge mustard seeds	Increased at 12 h and decreased at 3 and 26 h of imbibition of non-after-ripened seeds in 20 mM KNO3.	[83]
	ABI5	↑	Hedge mustard seeds	Stimulated by 20 mM KNO3 between 6 and 22 h of imbibition of 7-months after-ripened seeds.	[88]

↑ upregulation, ↓ downregulation, = no changes in gene expression.