Root restriction-induced limitation to photosynthesis in tomato (Lycopersicon esculentum Mill.) leaves

文献类型： 外文期刊

第一作者： Shi, Kai

作者： Shi, Kai;Ding, Xiao-Tao;Zhou, Yan-Hong;Yu, Jing-Quan;Yu, Jing-Quan;Dong, De-Kun

作者机构：

关键词： carbohydrates;chlorophyll fluorescence;leaf water potential;Lycopersicon esculentum;photosynthesis;root restriction

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

ISSN： 0304-4238

年卷期： 2008 年 117 卷 3 期

页码：

收录情况： SCI

摘要： Root restriction often depresses photosynthetic capacity and the mechanism for this reduction, however, remains unclear. To identify the mechanism by which root restriction affects the photosynthetic characteristics, tomato (Lycopersicon esculentum Mill.) seedlings were subjected to root restriction stress with or without supplemental aeration to the nutrient solution. With the development of the root restriction stress, CO(2) assimilation rate was decreased only in confined plants without supplemental aeration. There were also significant decreases in leaf water potential, stomatal conductance (g(s)), intercellular CO(2) concentration (C(i)), and increases in the stomatal limitation (1) and the xylem sap ABA concentration. Meanwhile, the maximum carboxylation rate of Rubisco (V(cmax)) and the capacity for ribulose-1,5-bisphosphate regeneration (J(max)) also decreased, followed by substantial reductions in the quantum yield of PSII electron transport (Phi(PSII)). Additionally, root restriction resulted in accumulation of carbohydrates in various plant tissues irrespective of aeration conditions. It is likely that root restriction-induced depression of photosynthesis was mimicked by water stress. (C) 2008 Elsevier B.V. All rights reserved.

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