Identification and characterization of genomic regions that control the capacity of water uptake in rice

作为一个高产的籼稻品种，Habataki保持了比日本标准品种Koshihikari和Sasanishiki更高的叶片光合速率，这是由于较高的水力传导度以及较高的叶片氮水平。根表面积较大的株系根导度显著较高。使用后代群体和线来自越光（或Sasanishiki）和Habataki之间的交叉，我们确定了负责水力传导的基因组区域内的165-kb的区域内的789-kb的区域内的长臂的4号染色体和短臂的8号染色体，分别。Habataki第4号染色体上的指定区域负责根质量的增加。

A high-yielding indica cultivar, Habataki maintains the higher rate of leaf photosynthesis than in the standard Japanese cultivars, Koshihikari and Sasanishiki as a result of the higher hydraulic conductance as well as the higher level of leaf nitrogen. The significant higher hydraulic conductance resulted from the larger root surface area in Habataki. Using progeny populations and lines derived from a cross between Koshihikari (or Sasanishiki) and Habataki, we identified the genomic regions responsible for the hydraulic conductance within a 165-kb region and within a 789-kb region on the long arm of chromosome 4 and on the short arm of chromosome 8, respectively. The designated region on chromosome 4 of Habataki was responsible for the increase in root mass.