衰老对生物来说是一个不可避免的生理过程。随着衰老的加深,体内的生理活动将发生较大的改变。在叶片衰老中,首先表现在蛋白质和叶绿素含量下降、光合作用降低,而光合作用的降低,将对作物产量发生较大的影响。从理论推算,如果在水稻生育后期将叶片衰老推迟一天,可使水稻产量增加2%(刘道宏,1983)。这就意味着,如果我们能够在实际生产中有效地延缓作物叶片的衰老,将会明显地提高产量。如何来达到这一目标呢?这是许多植物生理学家所关注的问题。 人们对叶片衰老的研究首先是从离体叶片入手的。在研究中发现,叶片衰老尽管不可避免,但很大程度上却可以设法延缓。植物 Aging is an inevitable physiological process for living things. With the deepening of aging, physical activity in the body will have a greater change. In leaf senescence, the first is the decrease of protein and chlorophyll, the decrease of photosynthesis, while the decrease of photosynthesis will have a greater impact on crop yield. Theoretically, rice production could be increased by 2% if leaf senescence was postponed by one day in late rice growth (Liu Daohong, 1983). This means that if we can effectively delay the aging of crop leaves in actual production, it will obviously increase the yield. How to achieve this goal? This is the concern of many plant physiologists. The first research on leaf senescence started from the leaves in vitro. In the study, it was found that although leaf senescence is inevitable, it can be largely postponed. plant