Effects of shading on the photosynthetic capacity, endogenous hormones and root yield in purple-fleshed sweetpotato (Ipomoea batatas (L.) Lam)

文献类型： 外文期刊

第一作者： Wang, Qingmei

作者： Wang, Qingmei;Hou, Fuyun;Dong, Shunxu;Xie, Beitao;Li, Aixian;Zhang, Haiyan;Zhang, Liming

作者机构：

关键词： Shading;Endogenous hormone;Yield;Purple-fleshed sweetpotato

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.412； 五年影响因子：3.691 ）

ISSN： 0167-6903

年卷期： 2014 年 72 卷 2 期

页码：

收录情况： SCI

摘要： A field experiment was conducted to examine the effects of shading on the photosynthetic capacity, endogenous hormones and root yield in purple-fleshed sweetpotato [Ipomoea batatas L. cv. Jishu18 and Ayamuraski (Aya)]. Sweetpotato plants were treated with two shading levels, 40 and 70 % shading, with full radiation used as a control. The results showed that the photosynthetic rate, adenosine triphosphatase activity, Ribulose 1,5-bisphosphate carboxylase activity and soluble sugar content decreased under both shading treatments. Leaf indole-3-acetic acid (IAA) and abscisic acid content increased, whereas leaf gibberellic acid content, zeatin riboside (ZR) content, root IAA, and ZR content decreased in the plants under both shading treatments. Shading also altered the production of sweetpotato storage root, including reductions in the root yield and dry matter accumulation, increase in the top/root (T/R) ratio, and the difference between the treatments and control for the T/R value and storage root yield was significant. Therefore, the responses of the photosynthetic parameters and endogenous hormones to shading were closely correlated with the variation in the storage root yield of the different cultivars. In response to shading, the reduction of root ZR contents, the fresh dry weight of the above-ground parts and the root yield for Jishu18 were higher than that for cv. Aya, indicating that cv. Jishu18 might be more sensitive to weak light than cv. Aya.

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