试想一下市场上及菜场上所卖的豆芽之类吧,茎的顶端必定有类似钩状的东西,故一般称其为芽钩。此种幼芽顶端的钩状部分,在植物从土壤中发芽时起着重要的作用。如果幼芽顶端不长钩,子叶笔直地展开而行出芽,则柔软的生长点部分碰到土壤而受伤害,幼芽就不能很好地长出。最近已经明确,这种芽钩的开放关闭,乙烯起着重要的作用。植物幼芽的顶端部分,碰到土壤物理上的压力后, Just think of the bean sprouts and the like sold on the market and the farms. The top of the stem must have something similar to a hook, so it is generally called a bud hook. The hook-shaped part of the top of such shoots plays an important role in plant germination from the soil. If the top of the sprout is not long hook, cotyledons spread out and budding, the soft part of the growth point hit the soil and hurt, the sprout can not grow well. It has recently been made clear that ethylene plays an important role in the opening of this budding hook. The top part of plant buds, after encountering the physical pressure of the soil,