Leaves senescence的用法和样例：
例句
- The changes of polyamines during peanut leaf senescence of two different senescent type peanut varieties were studied.
在大田条件下以两个不同衰老型花生品种为材料，研究了叶片衰老过程中多胺的变化。 - It showed that paclobutrazol decreased the polyamines in young leaves, but increased the polyamines in matrured leaves and delayed senescence at the same time.
结果证明多效唑对内源多胺的影响较复杂，多效唑降低了幼嫩叶片的多胺含量，却提高了成熟叶片衰老阶段的多胺含量，并起到延缓衰老的作用。
