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

由于较高的导水率和较高的叶片氮素水平，高产品种哈巴塔基保持了比标准日本品种Koshihikari和Sasanishiki更高的叶片光合作用速率。哈巴塔基较大的根表面积导致了显著较高的导水率。利用来自Koshihikari(或Sasanishiki)和Habataki杂交的后代群体和品系，我们分别在4号染色体长臂上的165kb区域和8号染色体短臂上的789kb区域内鉴定了负责水力传导性的基因组区域。哈巴塔基4号染色体上的指定区域是导致根质量增加的原因。

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.