两系杂交水稻杂种优势研究　Ⅱ.生理和生物学基础分析

STUDIES ON THE HETEROSIS OF TWO-LINE HYBRID RICE Ⅱ. ANALYSES OF PHYSIOLOGICAL AND BIOLOGICAL CHARACTERS

本实验研究了籼粳交、籼爪交、籼籼交三种类型的两系杂交稻组合W6154s／02428、W6154s／轮回422、W6154s／Lemoney的某些生理和生物学特性。结果表明，三种类型的两系杂交水稻组合在分蘖能力、萌发种子的淀粉酶活性、秧苗期根的吸收能力均表现出亚种间的籼粳交组合＞亚亚种的籼爪交间组合＞品种间的籼籼交组合＞三系组合（对照）。种子萌发时两系组合的根的吸收能力表现出负向的平均优势和竞争优势，亚种间组合W6154s／02428的净光合速率在生育各期均较高，亚亚种间组合W6154s／轮回422在灌浆中期谷粒中过氧化物酶的活性较低。

Some physiological and biological characters of three types of two-line F1 hybrid rices: Indica-Japonica (W61 54s/02428), Indica-Javanica (W6154s/Lunhui422), Indica-Indica (W6154s/Lemoney) were studied. The analyses of tillering ability, amylase activity of germinated seeds, and absorption capacity of roots at seedling stage showed a tendency to be in the order W61 54s/02428 >W6154s/Lunhui422 >W61 54s/Lemoney >Weiyou 64. Root absorption capacity of two-line F1 hybrid rices during seed sprouting showed negatively in average heterosis and competitive heterosis as compared to that of their parents or Weiyou 64. Net photosynthetic rate of W6154s/02428 was higher than that of other combinations at all growth stages, and the activity of POD in panicles of W6154s/Lunhui422 at the middle stage of grain filling was lowest compared to that of other combinations.