Quantitative trait loci for component physiological traits determining salt tolerance in rice
Quantitative trait loci for component physiological traits determining salt tolerance in rice
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DOI：
10.1104/pp.125.1.406
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发表时间：
2001-01-01
期刊：
影响因子：
7.4
通讯作者：
Yeo, AR
中科院分区：
文献类型：
--
作者：
Koyama, ML;Levesley, A;Yeo, AR
水稻（Oryza sativa）对盐分敏感，全世界五分之一的灌溉土地受到盐分的影响。在保持钾吸收的同时减少钠和氯的吸收是在盐条件下有助于生长的特征。我们描述的净量的离子运输到拍摄的遗传决定因素，明确区分数量性状基因座（QTL）的数量的离子在拍摄和那些影响离子的浓度在拍摄。后者与营养生长（活力）的QTL一致，因此它们的解释是模糊的。我们区分这些QTL是独立的活力，从而直接表明在离子吸收的基本机制的数量变化。这些QTL独立地控制钠吸收、钾吸收和钠：钾选择性。钠和钾吸收的QTL位于不同的连锁群（染色体）上。这是一致的钠和钾的吸收在映射人口的独立遗传和机制不同的吸收途径钠和钾在水稻在盐条件下（质外体渗漏和膜运输，分别）。我们报告的染色体位置的离子运输和选择性性状，是符合农艺需要，我们指出标记，以协助选择育种计划。基于对水稻离子吸收机制的认识，我们认为钠转运QTL可能通过控制根系发育发挥作用，而钾吸收QTL可能通过膜转运组分的结构或调节发挥作用。
Rice (Oryza sativa) is sensitive to salinity, which affects one-fifth of irrigated land worldwide. Reducing sodium and chloride uptake into rice while maintaining potassium uptake are characteristics that would aid growth under saline conditions. We describe genetic determinants of the net quantity of ions transported to the shoot, clearly distinguishing between quantitative trait loci (QTL) for the quantity of ions in a shoot and for those that affect the concentration of an ion in the shoot. The latter coincide with QTL for vegetative growth (vigor) and their interpretation is therefore ambiguous. We distinguished those QTL that are independent of vigor and thus directly indicate quantitative variation in the underlying mechanisms of ion uptake. These QTL independently govern sodium uptake, potassium uptake, and sodium:potassium selectivity. The QTL for sodium and potassium uptake are on different Linkage groups (chromosomes). This is consistent with the independent inheritance of sodium and potassium uptake in the mapping population and with the mechanistically different uptake pathways for sodium and potassium in rice under saline conditions (apoplastic leakage and membrane transport, respectively). We report the chromosomal location of ion transport and selectivity traits that are compatible with agronomic needs and we indicate markers to assist selection in a breeding program. Based upon knowledge of the underlying mechanisms of ion uptake in rice, we argue that QTL for sodium transport are likely to act through the control of root development, whereas QTL for potassium uptake are likely to act through the structure or regulation of membrane-sited transport components.