Table 4.

Absolute and relative traits measured for RIL population in 2016–17 (trait abbreviation followed by _S1) and 2017–18 (trait abbreviation followed by _S2) in control and drought and their time of measurement each season.

	Traits	Control	Drought	Relative	Time
Agronomic Traits
1	Germination	Gr_S1, Gr_S2	GrD_S1, GrD_S2	RGr_S1, RGr_S2	24th Nov
2	Heading date	Hd_S1, Hd_S2	HdD_S1, HdD_S2	RHd_S1, RHd_S2	50% spike emerg
3	Plant height	Ph_S1, Ph_S2	PhD_S1, PhD_S2	RPh_S1, RPh_S2	Before harvest
Physiological Traits
4	Transpiration rate	Tr_S1, Tr_S2	TrD_S1, TrD_S2	RTr_S1, RTr_S1	7th Feb
5	Stomatal conductance	Sc_S1, Sc_S2	ScD_S1, ScD_S2	RSc_S1, RSc_S2	7th Feb
6	Photosynthetic rate	Phr_S1, Phr_S2	PhrD_S1, PhrD_S2	RPhr_S1, RPhr_S2	7th Feb
7	Water use efficiency	Wue_S1, Wue_S2	WueD_S1, WueD_S2	RWue_S1, RWue_S2	7th Feb
Spike-Related Traits
8	Spike length	Sl_S1, Sl_S2	SlD_S1, SlD_S2	RSl_S1, RSl_S2	After harvest
9	Spike weight	Sw_S1, Sw_S2	SwD_S1, SwD_S2	RSw_S1, RSw_S2	After harvest
10	Seeds per spike	Sps_S1, Sps_S2	SpsD_S1, SpsD_S2	RSps_S1, RSps_S2	After harvest
11	Thousand kernel weight	Tkw_S1, Tkw_S2	TkwD_S1, TkwD_S2	RTkw_S1, RTkw_S2	After harvest
	Traits	Control	Drought	Time
Yield and Related Traits
12	Biomass	Bm_S1, Bm_S2	BmD_S1, BmD_S2	After harvest
13	Yield	Yd_S1, Yd_S2	YdD_S1, YdD_S2	After harvest
14	Harvest Index	HI_S1, HI_S2	HID_S1, HID_S2	After harvest
	Index	Abbrev.	Formula	Time
Stress Indices
15	Stress Tolerance Index (STI)	STI_S1, STI_S2	$\raisebox{1ex}{$\left(Yp\times Ys\right)$}\!\left/ \!\raisebox{-1ex}{${\left(\overline{Yp}\right)}^2$}\right.$	After harvest
16	Mean Productivity (MP)	MP_S1, MP_S2	$\raisebox{1ex}{$\left(Yp+Ys\right)$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$	After harvest
17	Stress Tolerance (ST)	ST_S1, ST_S2	$Yp-Ys$	After harvest
18	Stress Susceptibility Index (SSI)	SSI_S1, SSI_S2	$\left[1-\left(\raisebox{1ex}{$Ys$}\!\left/ \!\raisebox{-1ex}{$Yp$}\right.\right)\right]$/$\left[1-\left(\raisebox{1ex}{$\overline{Ys}$}\!\left/ \!\raisebox{-1ex}{$\overline{Yp}$}\right.\right)\right]$	After harvest
19	Drought Resistance Index (DRI)	DRI_S1, DR_S2	$Ys\times \left(\raisebox{1ex}{$Ys$}\!\left/ \!\raisebox{-1ex}{$Yp$}\right.\right)/\overline{Ys}$	After harvest
where Ys = yield under stress, $\overline{Ys}$ = mean yield under stress, Yp = yield under control and $\overline{Yp}$ = mean yield under control