The upper 10 cm sections of detached first leaves of light-grown 10-day wheat (Triticum vulgate) seedling were treated by immersing their cut ends in 25 ml beakers containing either solutions of ABA, KT or distilled water.

• 苗龄10天的小麦第一真叶的上部长10cm的离体叶片,将其形态下端直立插入不同的激素溶液中进行处理。 在光照下,对照组的气孔在24小时后关闭,ABA(10 ppm)处理叶片的气孔很快关闭,并加速衰老。