The role of endogenous hormones in regulating grain number in oat panicles under drought stress across cultivars.

Moreover, the three-way interaction of treatment × cultivar × year was highly significant ( Figure 2 , p < 0.01), suggesting that the combined effects of drought, genotype, and growing season are complex and non-additive. 3.2 Oat drought resistance index The drought resistance index (DI) of different oat cultivars over two years is presented in Figure 3 .

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