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首页> 外文期刊>Journal of the American Society for Horticultural Science >Drought response of young apple trees on three rootstocks. II. Gas exchange, chlorophyll fluorescence, water relations, and leaf abscisic acid.
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Drought response of young apple trees on three rootstocks. II. Gas exchange, chlorophyll fluorescence, water relations, and leaf abscisic acid.

机译：苹果幼树对三种砧木的干旱反应。二。气体交换，叶绿素荧光，水的关系和叶片脱落酸。

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摘要

Apple cv. Imperial Gala on M.9 EMLA, MM.111, and Mark rootstocks were subjected to 2 drought-stress and recovery periods in a rain shelter at Hickory Corners, Michigan. Water relations, gas-exchange parameters per unit leaf area and per tree, chlorophyll fluorescence, and leaf abscisic acid content were determined during each stress and recovery period. Whole-plant calculated gas exchange was the best indicator of plant response to drought stress, with consistent reductions in CO2 assimilation, transpiration and leaf conductance. Variable and maximal chlorophyll fluorescence and fluorescence quenching were not as sensitive to stress. Other fluorescence parameters showed little difference. The most consistent decreases due to stress for gas exchange/m2 were in transpiration and leaf conductance, with few differences in CO2 assimilation and fewer for mesophyll conductance, internal CO2 concentration and water-use efficiency. Leaf water potential was consistently lower during drought stress and returned to control values upon irrigation. Leaf abscisic acid content was higher for drought-stressed trees on M.9 EMLA than control trees during the stress periods. Trees on M.9 EMLA were the least affected by drought stress, those on MM.111 were intermediate, and those on Mark were the most sensitive. These results were consistent with growth data.
机译：苹果简历M.9 EMLA，MM.111和Mark砧木上的Imperial Gala在密歇根州Hickory Corners的雨棚里经受了2个干旱胁迫和恢复期。在每个胁迫和恢复时期，测定水的关系，每单位叶面积和每棵树的气体交换参数，叶绿素荧光和叶片脱落酸含量。全植物计算出的气体交换是植物对干旱胁迫反应的最佳指示，同时二氧化碳吸收，蒸腾作用和叶片电导率不断降低。叶绿素荧光的最大变化和荧光猝灭对压力不敏感。其他荧光参数几乎没有差异。气体交换/ m2压力引起的最一致的下降是蒸腾作用和叶片电导，CO2同化差异很小，而叶肉电导，内部CO2浓度和水分利用效率差异较小。干旱胁迫期间叶片水势一直较低，灌溉后恢复到控制值。在胁迫期间，M.9 EMLA上干旱胁迫树木的叶片脱落酸含量高于对照树木。 M.9 EMLA上的树木受干旱的影响最小，MM.111上的树木中等，Mark上的树木最敏感。这些结果与增长数据一致。

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