Sugars are under light control during bud burst in Rosa sp.
Sugars are under light control during bud burst in Rosa sp.
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DOI：
10.1111/j.1365-3040.2010.02152.x
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发表时间：
2010-08-01
影响因子：
7.3
通讯作者：
Leduc, Nathalie
中科院分区：
文献类型：
--
作者：
Girault, Tiffanie;Abidi, Farouk;Leduc, Nathalie
某些物种的萌芽是由光照环境决定的。对于玫瑰来说，对光的需求是绝对的，黑暗完全阻止了花蕾的萌发。很少有研究了解光在生理萌芽过程中的作用。在这里，我们展示了光对花蕾萌发期间糖代谢的某些成分的影响。对刺梨断头植株进行了测定。‘Radrazz’暴露在黑暗、白色、蓝色或R光下。结果表明，只有在光照条件下，花蕾和携带蔗糖储备的茎段才会发生动员，并伴随着芽的萌发。此外，导致蔗糖在芽中分解的RhVI液泡酸性转化酶的活性以及RhVI基因的转录在黑暗中降低，尽管它受到光的强烈刺激。对编码依赖于NAD的山梨醇脱氢酶的RhNAD-SDH基因的相同分析表明，相反，其在黑暗中的转录被强烈诱导，这可能反映了在这种条件下使用生存机制。
Bud burst in certain species is conditioned by the luminous environment. With roses, the requirement for light is absolute, and darkness totally inhibits bud burst. Few studies have looked into understanding the action of light on the physiological bud burst processes. Here, we show the impact of light on certain components of glucidic metabolism during bud burst. Measurements were taken on decapitated plants of Rosa hybrida L. 'Radrazz' exposed either to darkness, white, blue or R light. Results show that a mobilization of bud and the carrying stem sucrose reserves only takes place in light and accompanies the bud burst. Furthermore, the activity of the RhVI vacuolar acid invertase which contributes to the breakdown of sucrose in the buds, as well as the transcription of the RhVI gene, is reduced in darkness, although it is strongly stimulated by light. The same analysis concerning the RhNAD-SDH gene, coding an NAD-dependent sorbitol dehydrogenase, shows, on the contrary, a strong induction of its transcription in darkness that could reflect the use of survival mechanisms in this condition.