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首页> 外文期刊>Russian Journal of Plant Physiology >The effect of epibrassinolide on Arabidopsis seedling morphogenesis and hormonal balance under green light
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The effect of epibrassinolide on Arabidopsis seedling morphogenesis and hormonal balance under green light

机译：表油菜素内酯对绿灯下拟南芥幼苗形态发生和激素平衡的影响

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摘要

We studied the effect of 24-epibrassinolide (EB) on the levels of endogenous hormones and photomorphogenesis of Arabidopsis thaliana (L.) Heynh wild-type (Ler) and mutant (hy4) seedlings. This mutant is deficient in the cryptochrome 1 (CRY1) synthesis. CRY1, which is a product of the HY4 gene, is a blue light photoreceptor in wild-type plants, but is sensitive to green light as well. In dark-grown. seven-day-old mutant seedlings, the ABA/zeatin ratio differed from this ratio in wild-type seedlings. The hy4 mutant exhibited a lower zeatin and higher free-ABA contents, which could retard its hypocotyl growth in darkness. EB retarded the growth of hypocotyls in etiolated hy4 seedlings and enlarged their cotyledons more efficiently than in wild-type seedlings. Green light (GL) did not affect the growth of hypocotyls but enlarged cotyledons of hy4 seedlings, which might be associated with some increase in the level of free IAA and a considerable decrease in free ABA and also with a decrease in the cytokinin level in seedlings. The hy4 cotyledon response to GL depended evidently on photoreceptors other than CRY1. GL enhanced the effects of EB on the morphogenesis of both Ler and hY4 seedlings, which was coupled with changes in the balance of endogenous IAA, ABA, and cytokinins. We may suppose that EB is involved in the control of photomorphogenesis by interaction with endogenous hormones, which are involved in the transduction of a light signal absorbed by the GL photoreceptors.
机译：我们研究了24-表油菜素内酯（EB）对拟南芥（L.）Heynh野生型（Ler）和突变（hy4）幼苗内源激素水平和光形态发生的影响。该突变体在隐色染料1（CRY1）合成中不足。 CRY1是HY4基因的产物，是野生型植物中的蓝光感光体，但对绿光也很敏感。在深色的。在7天大的突变苗中，野生型苗中ABA /玉米素的比率不同于该比率。 hy4突变体表现出较低的玉米蛋白和较高的游离ABA含量，这可能会延迟其下胚轴在黑暗中的生长。与野生型幼苗相比，EB抑制了黄化hy4幼苗中下胚轴的生长，并更有效地扩大了它们的子叶。绿灯（GL）不会影响下胚轴的生长，但会增加hy4幼苗的子叶，这可能与游离IAA含量的一些增加和游离ABA的显着降低以及幼苗中细胞分裂素水平的降低有关。 hy4的子叶对GL的反应显然取决于除CRY1以外的感光体。 GL增强了EB对Ler和hY4幼苗形态发生的影响，并与内源IAA，ABA和细胞分裂素平衡的变化有关。我们可以假设EB通过与内源激素的相互作用而参与控制光形态发生，内源激素与GL感光体吸收的光信号的转导有关。

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