Table 1. Mean squares, genotypic and phenotypic coefficients of variation, and broad sense heritability of wheat grain number per spike under water stress during meiosis and normal growth conditions (control).

Grain number	MSg	MSe	${\mathbf{\delta }}_{\mathbf{g}}^{\mathbf{2}}$	${\mathbf{\delta }}_{\mathbf{e}}^{\mathbf{2}}$	${\mathbf{\delta }}_{\mathbf{p}}^{\mathbf{2}}$	H2
Water stress during meiosis	301.3**	148.0	51.1	49.3	100.4	0.51
Control	209.3**	64.5	48.3	21.5	69.8	0.70

MSg: mean square of genotype; MSe: mean square of random error; ${\mathrm{\delta }}_{\mathrm{g}}^2$: estimated genetic variance; ${\mathrm{\delta }}_{\mathrm{e}}^2$: estimated error variance; ${\mathrm{\delta }}_{\mathrm{p}}^2$: estimated phenotypic variance; H²: broad sense heritability.

** indicates significant difference at P < 0.01.