Genotypic Variation of Stomatal Conductance in Relation to Stomatal Density and Length in Rice (Oryza sativa L.)
Genotypic Variation of Stomatal Conductance in Relation to Stomatal Density and Length in Rice (Oryza sativa L.)
复制标题
水稻气孔导度与气孔密度和长度相关的基因型变异（Oryza sativa L.）
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
T. Shiraiwa
中科院分区：
文献类型：
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作者：
A. Ohsumi;Tomomi Kanemura;K. Homma;T. Horie;T. Shiraiwa
摘要气孔导度（gs）是决定水稻光合和蒸腾气体扩散的基因型差异的重要性状。在田间条件下，我们测定了64份来自水稻种质多样性研究集（RDRS）和3个高产品种（HYC）的GS，气孔密度和气孔长度（保卫细胞长度）。气孔导度和气孔长度在水稻品种间存在较大的差异，可以认为水稻品种间气孔导度反映了水稻气孔特征的物种多样性。在早熟性相近的品种间比较，HYC的gs值高于RDRS的大部分品种。气孔密度与气孔导度无相关性，气孔长度与气孔密度呈负相关。而后一种关系存在显著差异，HYC的气孔密度高于RDRS，气孔长度略短于RDRS。HYC的高气孔导度与其气孔密度和气孔导度有关，RDRS的高气孔导度品种气孔密度低，气孔导度高。气孔长度与比气孔导度相关，但二者之间存在显著差异。HYC的比气孔导度尚未达到气孔大小的上限，这为进一步提高HYC的气孔导度提供了可能。
Abstract Stomatal conductance (gs) is an important trait responsible for the genotypic difference in gas diffusion for photosynthesis and transpiration in rice (Oryza sativa L.). We measured gs, stomatal density and stomatal length (guard-cell length) at two weeks before heading for 64 accessions from a rice diversity research set of germplasm (RDRS) and for three high-yielding cultivars (HYC) under field conditions. Considerable variations in gs, and stomatal length were observed among varieties in RDRS, and it was considered that RDRS covers the species diversity of the stomatal characteristics in rice. When it was compared among the varieties with similar plant earliness, gs was higher in HYC than in most varieties of RDRS. Stomatal density did not correlate with gs, and there was a negative correlation between stomatal density and stomatal length. However, noticeable variance existed in the latter relation, where HYC exhibited a higher stomatal density and slightly shorter stomatal length than RDRS. High gs in HYC is attributable to their high stomatal density and moderate specific stomatal conductance (gs / stomatal density) while the high-gs varieties in RDRS tended to have a lower stomatal density and higher specific stomatal conductance. Stomatal length is related to specific stomatal conductance, but there are remarkable differences between these traits. Specific stomatal conductance in HYC has not reached the upper limit for their stomatal size, which raises a possibility of further improvement of HYC in gs.