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如果你认真观察,就可以看到,在光下和黑暗中培养的植物幼苗,它们的外形有很大的不同。在充足光照下生长的植物,叶色浓绿、植株健壮,而在黑暗中生长的植物叶呈黄色,茎叶细长脆弱,细胞伸长快而分化不良,机械组织不发达,植物含水量高,格外柔嫩。这就是黄化现象(etiolation),缺光是植物发生黄化的原因。黄化的植物见光后,很快就可以转绿。这是什么原因呢?原来绿色植物的茎、叶里普遍含有一种叶绿素,而叶绿素的形成是必须要有光线照射的。光照是影响叶绿素形成的主要条件之
If you look closely, you can see that the plant seedlings grown under light and in the dark have very different shapes. Plants grown under adequate light have dark leaf color and robust plants, whereas plants growing in the dark are yellow, slender and fragile stems and leaves, fast cell elongation and poor differentiation, underdeveloped mechanical tissues and high plant water content , Especially soft. This is the etiolation and lack of light is the cause of plant yellowing. Etiolated plants see the light, it can quickly turn green. What is the reason? The original green plants stems, leaves generally contain a chlorophyll, and the formation of chlorophyll is necessary to have light irradiation. Light is the main factor affecting the formation of chlorophyll