紫黄素又叫紫黄质。紫黄质就是叶黄素的一种，是植物激素脱落酸的合成前体。
叶绿体的套膜有紫黄质的淡黄色。
The chloroplast envelope has the light yellow color of violaxanthin.
叶黄素循环是指玉米黄质、花药黄质和紫黄质类之间的相互转换，它在高等植物光保护过程中发挥了重要作用。
The xanthophylls cycle refers to the conversion among zeaxanthin, antheraxanthin and violaxanthin, which plays a significant role in plant photoprotection process.
叶绿素，可溶性蛋白，类囊体膜脂脂肪酸不饱和度和紫黄质脱环氧化酶（VDE）蛋白量在衰老过程中逐渐下降。
Besides, chlorophyll content, soluble protein, thylakoid membrane lipids fatty acid instauration and activity of Violaxanthin de-epoxidase(VDE)were all decreased with the progress of senescence.
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