The influence of elevated CO₂ on the photosynthesis, carbohydrate status, and plastochron of young peach (Prunuspersica) trees

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• 作者：Anna M. Davidson ; David Da Silva…
• 关键词：Additional key wordscarbon assimilation rate ; leaf appearance rate ; metamer ; phyllochron
• 刊名：Horticulture, Environment, and Biotechnology
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：57
• 期：4
• 页码：364-370
• 全文大小：248 KB
• 刊物主题：Life Sciences, general; Plant Breeding/Biotechnology; Plant Physiology; Agriculture; Plant Ecology;
• 出版者：Springer Netherlands
• ISSN：2211-3460
• 卷排序：57

文摘

The plastochron, defined as the time interval between the initiations of two successive leaves, can also indicate the development of successive phytomers along a shoot. Previous work has shown that crop load impacts the plastochron in field-grown peach (Prunuspersica) trees, which led us to hypothesize that the plastochron of peach trees may be sensitive to the carbon status of the tree. To testthis hypothesis, a 38-day growth chamber study was conducted to determine if elevated CO₂ (800 μmol·mol-1) speeds up the plastochron of young peach trees relative to their growth in ambient (400 μmol·mol-1) CO₂. The leaf lamina lengths were measured every other day to generate leaf growth rate curves that were fitted against a classic Gompertz growth curve to estimate the time of the initiation of each leaf, which in turn, was used to estimate the plastochron. Additionally, in order to non-destructively gauge the effects of CO₂ concentration on plant performance during the experiment, net leaf CO₂ assimilation and stomatal conductance measurements were taken approximately half way through and at the end of the 38-day experiment. Doubling the ambient CO₂ concentration had no effect on the plastochron, even though the leaf CO₂ assimilation rates, leaf starch and total nonstructural carbohydrate concentrations were greater in trees grown in elevated CO₂. In addition, there were no significant treatment differences in incremental shoot growth or the number of lateral syleptic shoots.