Abstract: Root morphological and physiological characteristics were studied at different growth stages by using japonica hybrid rice combination Liaoyou 3225 and its parents and traditional varieties as materials. Results indicated that the root of japonica hybrid rice was thicker and stronger, and had significant heterosis in root absorbing area, root vigor, the ability synthesizing amino acids and absorbing inorganic phosphorus etc., especially at early stage. The root of japonica hybrid rice senesced earlier and more quickly than traditional varieties due to its content of MDA increased more rapidly, though its SOD activity was stronger after heading stage.

Key words: hybrid rice, root, physiological characteristics

摘要： 以粳型杂交稻辽优3225及其亲本和常规品种为材料，在不同生育时期对根系的形态和生理特性进行了研究。结果表明，粳型杂交稻根系粗壮，在根系吸收面积、根系活力、合成氨基酸和吸收无机磷的能力等方面都表现明显的优势，尤以生长前期优势表现更为明显。杂交稻根系衰老较早较快，抽穗后虽然其根系SOD活性较强，但MDA含量迅速上升，衰老严重。

关键词: 杂交稻, 根系, 生理特性