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Effect of heat stress on the grains number (A) and grain abortion rate (B). T and S represent the heat-tolerant variety and the heat-sensitive variety, respectively. L represents the natural environment and H represents the heat-stressed environment. V9, V12, and VT represent the 9th leaf, 12th leaf, and tasseling stages. Vertical bars represent ± SD of the mean. a, b, c, and d indicate significant difference among different treatments (n = 3, P < 0.05).
