Fig. 4. Relative proportion of endosperm nuclei in each C class, sampled after 0 (ct), 2 (2d), or 4 (4d) days of heat stress (DHS) treatments. (A) 11 days after pollination (DAP). (B) 14 DAP. (C) 17 DAP. (D) 20 DAP. Comparison of means was done by LSD; a and b indicate statistically different values at 5% (*) and 1% (**) levels of significance.