【摘要】 根据低磷胁迫下植株总吸磷量、单株籽粒重、相对根体积等将耐低磷种质对低磷的适应机制分为5类:根系扩展适应型、低浓度适应型、奢侈型、植株利用高效型、被动适应型。在进行耐低磷种质筛选的时候应选择植株利用高效型(单位磷能产生较高生物量或经济产量的基因型),即植株磷绝对吸收量低但产量不低。本试验筛选出7份植株利用高效型品种,分别为捻大粒、双城糯、有芒小红板稻、麻谷子、老爷胡子、承德京租、糯子,为磷高效遗传研究或育种利用提供可靠的资源。更多还原

【Abstract】 According to total P absorption per plant,grain weight and relative value of root volume in low P stress,the rice germplasm could be divided into 5 genotypes: Ⅰ root extend adaption,Ⅱ low concentration adaption,Ⅲ waste,Ⅳ high P utilization efficiency,Ⅴ passiveness adaption. Ⅳ high P utilization efficiency should be chosen when screening tolerant genotypes in low phosphorus because it could produce more biomass per unit P. 7 varieties with high P utilization efficiency were achieved,which were Niandali,Shuangchengnuo,Youmangxiaohongbandao,Maguzi,Laoyehuzi,Chengdejinzu,Nuozi.更多还原