Partial and full root-zone drought stresses account for differentiate root-sourced signal and yield formation in primitive wheat

Table 2 Effects of water stress on yield and yield components of primitive wheat (diploid and tetraploid) cultivars

Species	Varieties	Treatments	Grain yield (g/plant)	Above-ground biomass (g/plant)	Root biomass (g/plant)	Harvest index	Root-to-shoot ratio
Diploid	MO1	WW	2.08 ± 0.02c	5.49 ± 0.03c	0.43 ± 0.03b	0.38 ± 0.01a	0.08 ± 0.01a
		FS	1.39 ± 0.05b	3.41 ± 0.06b	0.29 ± 0.03a	0.39 ± 0.02a	0.08 ± 0.01a
		PS	1.11 ± 0.02a	3.04 ± 0.07a	0.21 ± 0.04a	0.37 ± 0.01a	0.07 ± 0.01a
	MO4	WW	1.95 ± 0.03c	5.14 ± 0.09c	0.40 ± 0.03b	0.38 ± 0.01a	0.08 ± 0.00a
		FS	1.13 ± 0.05b	2.93 ± 0.03b	0.27 ± 0.04a	0.38 ± 0.02a	0.09 ± 0.01a
		PS	0.97 ± 0.05a	2.57 ± 0.10a	0.23 ± 0.03a	0.37 ± 0.01a	0.07 ± 0.01a
Tetraploid	DM22	WW	3.20 ± 0.04c	6.98 ± 0.38c	0.46 ± 0.02b	0.47 ± 0.02a	0.07 ± 0.01a
		FS	2.08 ± 0.04b	4.02 ± 0.11b	0.35 ± 0.03a	0.59 ± 0.01b	0.09 ± 0.01a
		PS	1.87 ± 0.11a	3.16 ± 0.11a	0.28 ± 0.03a	0.62 ± 0.05b	0.09 ± 0.01a
	DM31	WW	2.69 ± 0.06c	6.78 ± 0.16c	0.48 ± 0.06b	0.42 ± 0.02a	0.07 ± 0.01a
		FS	2.04 ± 0.06b	4.20 ± 0.04b	0.31 ± 0.05a	0.52 ± 0.01b	0.07 ± 0.01a
		PS	1.72 ± 0.02a	3.36 ± 0.02a	0.25 ± 0.04a	0.53 ± 0.01b	0.07 ± 0.01a
	ANOVA	Variety	***	***	*	***	ns
		Treatment	***	***	***	***	ns
		V × T	*	ns	ns	**	ns

Values are mean ± SE (n = 15). Means within column having same letter are statistically similar at P < 0.05 according to Duncan’s multiple range tests. *, **, *** indicate significant at 0.05, 0.01, and 0.001, respectively

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