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绪论巴西橡胶树是落叶树,成龄胶树一般都在每年年初落叶。老叶的这种自然脱落通常叫做越冬。相反,幼树可以在老叶脱落前长出几蓬新叶。这种落叶抽叶过程整年都有出现,没有一个显著的年周期。引起胶树叶片衰老和脱落的主要因素是生长促进物质吲哚乙酸和生长抑制物质脱落酸之间的不平衡。另一方面,随着叶龄增长,蛋白质、核糖核酸的合成受到抑制以及某些酶水解活动的增加也与此有关。
Introduction Brazil rubber tree is deciduous trees, plastic trees are generally deciduous leaves at the beginning of each year. This natural shedding of old leaves is often called wintering. In contrast, saplings grow new leaves before they fall off. This deciduous leaf-extraction process occurs throughout the year without a significant annual cycle. The main factor that causes gum tree leaf senescence and shedding is the imbalance between the growth-promoting substance indole acetic acid and the abscisic acid, a growth-inhibiting substance. On the other hand, with the increase of leaf age, the synthesis of protein and RNA is inhibited and the increase of some enzymatic hydrolysis activity is related to this.