Stem growth habit affects leaf morphology and gas exchange traits in soybean
Stem growth habit affects leaf morphology and gas exchange traits in soybean
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DOI：
10.1093/aob/mcp240
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发表时间：
2009-12-01
期刊：
影响因子：
4.2
通讯作者：
Shiraiwa, Tatsuhiko
中科院分区：
文献类型：
--
作者：
Tanaka, Yu;Shiraiwa, Tatsuhiko
大豆品种的茎生长习性（确定或不确定）影响多种植物形态和发育性状。本研究的目的是确定大豆茎生长习性对与其叶片形态有关的单叶气孔导度的影响，以便更好地了解该植物性状的生态和农艺意义。在有利的田间条件下定期测量主茎上叶片的气孔导度，以评估四个大豆品种及其各自的确定或不确定近等基因系（NIL）的g（max），定义为全叶展开时的最大气孔导度。还测量了叶片形态性状，包括气孔密度、保卫细胞长度和叶脉密度。两年间所有基因型的 g(max) 值范围为 0 中心点 383 至 0 中心点 754 mol H2O m(-2) s(-1)。对于四对品种，两年中不确定品系的 g(max)、气孔密度、单位面积表皮细胞数和单位面积总静脉长度均显着高于其各自的确定 NIL。在确定类型中，保卫细胞长度、单位面积叶质量和单叶尺寸都趋于更大。气孔密度和保卫细胞长度的乘积很好地解释了 g(max) 随基因型和年份的变化（r = 0 中心点 86，P < 0 中心点 01）。不确定的茎生长习性导致大豆的最大气孔导度大于确定的茎生长习性，这归因于叶片结构的差异。这就提出了进一步的假设，即茎生长习性的差异导致田间大豆植株的水分利用特征不同。有利条件下的气孔导度可以通过叶片形态特征来改变。
The stem growth habit, determinate or indeterminate, of soybean, Glycine max, varieties affects various plant morphological and developmental traits. The objective of this study is to identify the effect of stem growth habit in soybean on the stomatal conductance of single leaves in relation to their leaf morphology in order to better understand the ecological and agronomic significance of this plant trait.The stomatal conductance of leaves on the main stem was measured periodically under favourable field conditions to evaluate g(max), defined as the maximum stomatal conductance at full leaf expansion, for four varieties of soybean and their respective determinate or indeterminate near isogenic lines (NILs). Leaf morphological traits including stomatal density, guard cell length and vein density were also measured.The value of g(max) ranged from 0 center dot 383 to 0 center dot 754 mol H2O m(-2) s(-1) across all the genotypes for both years. For the four pairs of varieties, the indeterminate lines exhibited significantly greater g(max), stomatal density, numbers of epidermal cells per unit area and total vein length per unit area than their respective determinate NILs in both years. The guard cell length, leaf mass per area and single leaf size all tended to be greater in the determinate types. The variation of g(max) across genotypes and years was well explained by the product of stomatal density and guard cell length (r = 0 center dot 86, P < 0 center dot 01).The indeterminate stem growth habit resulted in a greater maximum stomatal conductance for soybean than the determinate habit, and this was attributed to the differences in leaf structure. This raises the further hypothesis that the difference in stem growth habit results in different water use characteristics of soybean plants in the field. Stomatal conductance under favourable conditions can be modified by leaf morphological traits.