北方粳型杂交稻根系生长特征研究

以粳型杂交稻及其亲本和常规品种为材料，在不同生育时期对其根系生长和形态特征进行比较研究。结果表明，粳型杂交稻根系粗壮，下扎深，发根力，根长，根体积，根重和根冠比重方面都有明显的优势，尤以生长前期表现为明显，杂交稻的根系性状从抽穗期到乳熟期呈现大幅度下降，而乳熟期到黄熟期变化比较缓慢，这种趋势与常规品种正好相反，可能与其结实率低密切相关。

Study on Root Growth Characteristics of Japonica Hybrid Rice in North China

Root developing trends and morphological characters in different growth stages were studied with japonica hybrid rice combination and its retainer and restorer and conventional varieties. The results indicated that the root of japonica hybrid rice was thick, strong and deep extending. Heterosis was behaved significantly in the ability to develop new roots, root volume, root max-length, root dry weight and ratio of root dry weight to coronal, especially in prophase of growth. The root characters of hybrid rice were decreased in great extent from heading stage to grouting stage, but only exiguous changes happened from grouting stage to ripening stage, and reverse to conventional varieties, which should be closely related to the low ripened percentage of hybrid rice.