Root restriction-induced limitation to photosynthesis in tomato (Lycopersicon esculentum Mill.) leaves
Root restriction-induced limitation to photosynthesis in tomato (Lycopersicon esculentum Mill.) leaves
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DOI：
10.1016/j.scienta.2008.04.010
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发表时间：
2008-07-23
影响因子：
4.3
通讯作者：
Yu, Jing-Quan
中科院分区：
文献类型：
--
作者：
Shi, Kai;Ding, Xiao-Tao;Yu, Jing-Quan
根系限制常常抑制光合能力，然而，这种减少的机制仍不清楚。以番茄（Lycopersicon esculentum Mill.）在对营养液进行或不进行补充通气的情况下，使幼苗经受根限制胁迫。随着根系限制胁迫的发展，CO2同化速率仅在不通气的条件下降低。叶片水势、气孔导度（g（s））、胞间CO_2浓度（Ci）显著降低，气孔限制（1）和木质部汁液阿坝浓度显著升高。与此同时，Rubisco的最大羧化速率（V-cmax）和核酮糖-1，5-二磷酸再生能力（J（max））也随之降低，PSII电子传递量子产率（Phi（PSII））也随之大幅降低。此外，根限制导致碳水化合物在各种植物组织中的积累，无论通气条件。这是可能的，根限制引起的光合作用的抑制是模仿水分胁迫。(C)2008 Elsevier B. V.保留所有权利。
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, CO2 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 CO2 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.