Flooding, gas exchange and hydraulic root conductivity of highbush blueberry
Flooding, gas exchange and hydraulic root conductivity of highbush blueberry
复制标题
高丛蓝莓的水淹、气体交换和水力根系传导性
DOI：
10.1111/j.1399-3054.1986.tb05053.x
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
J. Flore
中科院分区：
文献类型：
--
作者：
F. S. Davies;J. Flore
高丛蓝莓（Vaccinium corymbosum L.）CV.在实验室中，将生长在容器中的蓝作物（Bluecrop）淹没不同的持续时间，以确定淹没对碳同化、对不同CO2和O2浓度的光合反应以及在开放流气体分析系统中测量的表观量子产率的影响。还使用压力室测量了根的导水率。根电导率较低，增加CO2水平对碳同化的影响较小，淹没比未淹没的植物后，短期（1 -2天），中期（10-14天）和长期（35-40天）的洪水。对于未淹水的植物，叶片周围的O2水平从21%降低到2%，碳同化增加了33%，羧化效率从0.012增加到0.021 mol CO2固定（mol CO2）−1。然而，淹水植物的羧化效率不受O2百分比降低的影响，平均为0.005 mol CO2固定（mol CO2）-1。表观量子产率从未淹水植物的2.2 × 10−1 mol CO2固定（mol light）−1分别下降到中期和长期淹水的2.0 × 10−3和9.0 × 10−4。短期淹水通过降低气孔导度降低了碳同化，而较长的淹水时间也降低了叶片的羧化效率。
Highbush blueberry plants (Vaccinium corymbosum L. cv. Bluecrop) growing in containers were flooded in the laboratory for various durations to determine the effect of flooding on carbon assimilation, photosynthetic response to varying CO2 and O2 concentrations and apparent quantum yield as measured in an open flow gas analysis system. Hydraulic conductivity of the root was also measured using a pressure chamber. Root conductivity was lower and the effect of increasing CO2 levels on carbon assimilation less for flooded than unflooded plants after short-(i-2 days), intermediate-(10–14 days) and long-term (35–40 days) flooding. A reduction in O2 levels surrounding the leaves from 21 to 2% for unflooded plants increased carbon assimilation by 33% and carboxylation efficiency from 0.012 to 0.021 mol CO2 fixed (mol CO2)−1. Carboxylation efficiency of flooded plants, however, was unaffected by a decrease in percentage O2, averaging 0.005 mol CO2 fixed (mol CO2)−1. Apparent quantum yield decreased from 2.2 × 10−1 mol of CO2 fixed (mol light)−1 for unflooded plants to 2.0 × 10−3 and 9.0 × 10−4 for intermediate- and long-term flooding durations, respectively. Shortterm flooding reduced carbon assimilation via a decrease in stomatal conductance, while longer flooding durations also decreased the carboxylation efficiency of the leaf.