Effects of sink demand and nutrient status on leaf photosynthesis of spring-cycle shoot in 'Newhall' navel orange under natural field conditions

文献类型： 外文期刊

第一作者： Zhang, Wen-Wen

作者： Zhang, Wen-Wen;Fu, Xing-Zheng;Peng, Liang-Zhi;Ling, Li-Li;Cao, Li;Ma, Xiao-Huan;Xie, Fa;Li, Cai;Zhang, Wen-Wen;Ma, Xiao-Huan;Xie, Fa;Li, Cai;Fu, Xing-Zheng;Peng, Liang-Zhi;Ling, Li-Li;Cao, Li

作者机构：

关键词： Sink demand;Photosynthesis;Navel orange;Leaf morphology features;Nutrition;Fruit quality

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： 2013 年 150 卷

页码：

收录情况： SCI

摘要： Many studies have been performed to evaluate the effects of sink demand on photosynthesis using artificial defruiting experiments. However, information is scarce regarding photosynthesis changes in field citrus trees with naturally varying sink demands. In this study, we compared photosynthesis in three types of shoots of 'Newhall' navel oranges (Citrus sinensis Osbeck), including no fruit bearing shoots, one-fruit bearing shoots and two-fruit bearing shoots, in field conditions. The results showed that the highest sink demand of shoots corresponded to the lowest net photosynthetic rate (Pn). The determination of stomatal conductance (Gs), substomatal CO2 concentration (Ci) and transpiration rate (E) suggested that the Gs and E were not significantly different between these three types of shoots, while the Ci increased as the sink demand increased. Further analysis of leaf morphology features and nutrient status showed that the higher fruit load shoots had smaller leaf area, length, width, thickness and dry weight, and also lower concentrations of nitrogen, phosphorous and potassium. The quality comparison of fruits on one-fruit bearing shoots and two-fruit bearing shoots suggested that there was no difference in internal quality such as total soluble solids (TSS), titratable acidity (TA) and the TSS/TA ratio except for some external features. Overall, our data indicated that the reduction of Pn with sink demand increasing was mainly caused by limited development and a lower nutritional supply in source leaves. This limitation may be derived from competition between fruit and adjacent leaves under a high fruit load. This finding provides new insights into sink demand effects on photosynthesis in field conditions and useful guidance for citrus orchard management practices. (C) 2012 Elsevier B.V. All rights reserved.

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