Drought stress tolerance strategies revealed by RNA-Seq in two sorghum genotypes with contrasting WUE

BMC Plant Biology

Table 1 Physiological responses of sorghum genotypes to drought stress

Genotype	Condition	FTSW	RWC	Chlorophyll fluorescence			Gas exchange
Genotype	Condition	FTSW	RWC	Fv/Fm	ΦPSII	qNP	Pn	E	WUE_i	WUE_a
		%	%				μmol m⁻² s⁻¹	mmol m⁻² s⁻¹	μmol mol⁻¹	g/l
IS20351	WW	0.70	92.7	0.803^a	0.50^a	0.18^a	31.2^a	4.58^b	6.38^a	3.31^b
	DS	0.2	78.4	0.779^c	0.28^c	0.15^b	19.8^c	5.56^a	3.56^c	3.26^b
IS22330	WW	0.80	92.9	0.804^a	0.52^a	0.11^b	30.4^a	4.51^b	6.74^a	3.74^ab
	DS	0.2	88.4	0.791^b	0.36^b	0.08^c	24.1^b	4.93^b	4.88^b	4.23^a
LSD _(0.05)			7.76	0.006	0.08	0.002	2.4	0.58	0.28	0.59
P		<0.0001	<0.01	<0.0001	<0.05	<0.0001	<0.0001	<0.001	<0.01	<0.05

Analysis of relative water content (RWC), chlorophyll fluorescence (Fv/Fm, FPSII and qNP), gas exchange (Photosynthetic rate, Pn, and Transpiration, E), intrinsic (WUEi) and agronomic WUE (WUEa) in sorghum plants in well-watered (WW) and drought stress (DS) conditions at vegetative stage of 9th leaf. Values followed by the same letter are not statistically significant at LSD test p < 0.05 performed on the interaction genotype× irrigation.

ISSN: 1471-2229