在前几讲中提到的生长素、赤霉素和细胞分裂素都有促进植物生长和发育的作用。植物的一生,从萌发到开花结实,直至器官脱落。整株衰老,是一个自然过程。那么,有没有天然的抑制生长发育的植物激素呢?有。1964年,美国的阿迪科特(F·T·Addicott)等人,从未成熟将要脱落的棉桃中,提取出一种促 The auxins, gibberellins and cytokinins mentioned in previous lectures all have the role of promoting plant growth and development. The life of the plant, from germination to flowering strong until the organs fall off. Whole plant aging is a natural process. So, there is no natural inhibition of the growth and development of plant hormones it? In 1964, the United States, F · T · Addicott et al, who never mature shed cotton, extract a kind of promote