Comparison of phenotypes exhibited by BTI1 RNAi transgenic lines, bti1-2 mutant plants, and wild-type nontransgenic plants. All plants were grown in short-day conditions for 5 weeks and moved to a growth chamber in long-day conditions for 1 week. A, Plants from four independent BTI1 RNAi transgenic lines. B, bti1-2 mutant plants. C, Wild-type plants.