Mycorrhizal promotion of host stomatal conductance in relation to irradiance and temperature
Mycorrhizal promotion of host stomatal conductance in relation to irradiance and temperature
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DOI：
10.1007/s00572-003-0241-x
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发表时间：
2004-04-01
期刊：
影响因子：
3.9
通讯作者：
Cho, KH
中科院分区：
文献类型：
--
作者：
Augé, RM;Moore, JL;Cho, KH
丛枝菌根（AM）真菌在根部和土壤中的定殖有时会促进宿主植物的气孔导度（g（s）），但科学家们很难预测或操纵这种反应。我们的目标是测试AM对g（s）的影响程度是否与环境条件有关：辐照度，空气温度或叶温。在自然变化的温室条件下，在31个上午和下午的时间内，将两组未定殖高粱植株的气孔导度与被球囊霉（Gi）或珍珠巨孢霉（Gm）定殖的植株的气孔导度进行了比较。气孔导度的Gi和Gm植物往往显着高于g（S）的类似大小的nonAM植物。AM促进g（s）是最小的在最低的辐照度和最低的空气和叶片温度，但在中等的辐照度和温度是实质性的。在最高的辐照度和温度下，AM促进再次低或不存在。AM促进g（s）的幅度不是绝对g（s）的函数。Gi和Gm对gs的促进作用非常相似。不同施磷量对g（s）无影响。
Colonization of roots and soil by arbuscular mycorrhizal (AM) fungi sometimes promotes stomatal conductance (g(s)) of the host plant, but scientists have had difficulty predicting or manipulating the response. Our objective was to test whether the magnitude of AM influence on g(s) is related to environmental conditions: irradiance, air temperature or leaf temperature. Stomatal conductances of two groups of uncolonized sorghum plants were compared to g(s) of plants colonized by Glomus intraradices (Gi) or Gigaspora margarita (Gm) in 31 morning and afternoon periods under naturally varying greenhouse conditions. Stomatal conductance of Gi and Gm plants was often markedly higher than g(s) of similarly sized nonAM plants. AM promotion of g(s) was minimal at the lowest irradiances and lowest air and leaf temperatures, but was substantial at intermediate irradiance and temperatures. AM promotion was again low or absent at the highest irradiances and temperatures. Magnitude of AM promotion of g(s) was not a function of absolute g(s). Promotion of gs by Gi and Gm was remarkably similar. Differing phosphorus fertilization did not affect g(s).