Carbohydrate accumulation may be the proximate trigger of anthocyanin biosynthesis under autumn conditions in Begonia semperflorens.
Carbohydrate accumulation may be the proximate trigger of anthocyanin biosynthesis under autumn conditions in Begonia semperflorens.
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DOI：
10.1111/j.1438-8677.2012.00721.x
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发表时间：
2013-11
期刊：
影响因子：
3.9
通讯作者：
K. M. Zhang;Z. Li;Y. Li;Yonghua Li;D. Kong;R. Wu
中科院分区：
文献类型：
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作者：
K. M. Zhang;Z. Li;Y. Li;Yonghua Li;D. Kong;R. Wu
许多植物的叶子在秋季呈现红色，许多论文都集中在这一过程中的环境因素和花青素的作用。然而，很少有论文研究了在此过程中诱导的物质。我们假设，过量的糖积累直接诱导花青素积累在秋季条件下。采用限制韧皮部运动和外源蔗糖喂养两种方法，发现过量光合产物和外源蔗糖都能诱导花色素苷的合成，相应地，参与花色素苷合成的几种酶（苯丙氨酸解氨酶、查尔酮异构酶、二氢黄酮醇4-还原酶和类黄酮3-O-葡萄糖基转移酶）和转运酶（谷胱甘肽S-转移酶）的表达上调。我们的研究结果表明，过量的碳水化合物可能是诱导花青素合成的最接近的触发器在秋季，但只有当碳水化合物积累储存。
Many plant leaves appear red in the autumn, and many papers have focused on the environmental factors and role of anthocyanin in this process. However few papers have examined the substances that are induced during this process. We hypothesised that excess sugar accumulation directly induces anthocyanin accumulation under autumn conditions. Using two methods (restricting phloem movement and exogenous sucrose feeding), we found that both surplus photosynthate and exogenous sucrose could induce anthocyanin biosynthesis, corresponding to up-regulation of several enzymes involved in anthocyanin biosynthesis (phenylalanine ammonia lyase, chalcone isomerase, dihydroflavonol 4-reductase and flavonoid 3-O-glucosyl transferase) and in transport (glutathione S-transferase). Our results suggest that excess carbohydrate may be the proximate trigger for induction of anthocyanin biosynthesis in autumn, but only when carbohydrates are accumulated for storage.