Variability of Leaf Morphology and Stomatal Conductance in Soybean [Glycine max (L.) Merr.] Cultivars
Variability of Leaf Morphology and Stomatal Conductance in Soybean [Glycine max (L.) Merr.] Cultivars
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DOI：
10.2135/cropsci2010.02.0058
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发表时间：
2010-11-01
期刊：
影响因子：
2.3
通讯作者：
Shiraiwa, T.
中科院分区：
文献类型：
--
作者：
Tanaka, Y.;Fujii, K.;Shiraiwa, T.
叶片表皮结构是大豆[Glycine max (L) Merr.]叶片气体交换的重要决定因素，可作为气体交换性状选择的间接标准。本研究的目的是评估大豆品种之间叶片形态的遗传变异，并研究美国和日本品种在气体交换方面的差异。包括美国和日本大豆在内的 70 多个品种在田间种植了 2 年多的时间，以确定气孔密度、保卫细胞长度和潜在气孔导度以及其他叶片形态性状。在品种中，气孔密度范围为148至334 mm(-2)。潜在气孔导度（g(p)）存在较大变化，与代表性基因型田间气孔导度密切相关（r = 0.89，P < 0.01）。美国品种的 g(p) 值高于日本和其他亚洲品种。这种潜力可能为在美国品种中观察到的更高生产力提供生理和形态学基础。另一方面，PI 416937 显示出较低的气孔导度，这与保存水分的能力一致。这项研究表明了叶子结构在决定气体交换方面的重要性，并表明可以优化这些特征以提高干物质生产力和水分利用。
Leaf epidermal structure is an important determinant of leaf gas exchange in soybeans [Glycine max (L) Merr.] and can be used as an indirect criterion for the selection of gas exchange traits. The objective of this study was to assess the genetic variation of leaf morphology among soybean cultivars and to examine how U.S. and Japanese cultivars differ with respect to gas exchange. Over 70 cultivars, including U.S. and Japanese soybean, were grown in the field over 2 yr to determine stomatal density, guard cell length, and potential stomatal conductance, along with other morphological leaf traits. Among cultivars, stomatal density ranged from 148 to 334 mm(-2). Large variation was found in potential stomatal conductance (g(p)), which was closely associated with stomatal conductance in the field for representative genotypes (r = 0.89, P < 0.01). United States cultivars had larger g(p) values than Japanese and other Asian cultivars. This potential may give a physiological and morphological basis for the greater productivity observed in U.S. cultivars. On the other hand, PI 416937 showed lower stomatal conductance, which is consistent with the ability to conserve water. This study indicates the importance of leaf structure in determining gas exchange and suggests that these characteristics may be optimized to enhance dry matter productivity and water use.