Figure 1.

Heat stress tolerance during germination. Dehusked seeds of “N22” and “IR64” were allowed to germinate in petri plates in an incubator set at 28°C (control) for 24 h. The 1 day old germinating seedlings were kept at 28°C (control) or 37°C (heat stress) for 4 days under dark. Mean and standard error values (n = 20) are shown for (A) root length (C) shoot length, and (B) and (D) same data shown in (A) and (C) repectively, expressed as per cent of control. Means marked with different letters indicate significant differences at α = 0.05 using Duncan's multiple range test.