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以籼稻、粳稻和典型籼粳稻杂交衍生的重组自交系群体为试材,研究花时性状在籼粳稻杂交后代中的表现及其对外部环境的响应规律。结果表明,:花时性状在籼粳稻杂交后代中均呈连续变异,表现出数量性状的遗传特点。始花时、盛花时和终花时之间存在极显著的正相关,始花时与开花持续时间呈极显著的负相关。籼粳交后代中,花时与程氏指数相关不显著。籼稻与粳稻的花时性状对外部环境的敏感性不同,与粳稻相比,籼稻更容易受外部环境的影响。07:01—08:00的平均气温与籼稻的始花时、盛花时显著负相关,对粳稻影响不显著,14:01—15:00的平均气温与典型粳稻的盛花时呈显著的负相关,日最高气温与籼稻的始花时和终花时呈显著的负相关。无论籼稻还是粳稻,气温高低仅影响花时的早晚,对开花持续时间的长短影响不大。籼稻对空气湿度较粳稻敏感,07:01—08:00,08:01—09:00,10:01—11:00及07:01—15:00的平均湿度与籼稻的终花时呈显著至极显著的正相关,空气湿度对粳稻花时的影响未达显著水平,无论籼稻还是粳稻,空气湿度对开花持续时间均无显著影响。太阳辐射强度对花时性状的影响未达显著水平。
The recombinant inbred lines derived from indica, japonica and japonica hybrid rice were used as materials to study the performance of flowering characters in indica and japonica hybrids and their response to external environment. The results showed that: the flowering traits showed continuous variation in the progeny of indica and japonica hybrids, showing the genetic characteristics of quantitative traits. At the beginning of flowering, there was an extremely significant positive correlation between the flowering time and the flowering time. The flowering time was extremely significantly negatively correlated with flowering duration. Among the progenies of indica and japonica crosses, the correlation between flowering and Cheng’s index was not significant. Indica and japonica flower-time traits have different sensitivity to the external environment. Compared with japonica rice, indica rice is more likely to be affected by the external environment. The average temperature of 07: 01-08: 00 was significantly negatively correlated with the flowering time when flowering and the flowering of indica, and had no significant effect on japonica rice. The average temperature between 14: 01-15: 00 was significantly negatively correlated with the flowering time of typical japonica rice The daily maximum air temperature was significantly negatively correlated with the initial flowering and final flowering of indica rice. Both indica and japonica rice, the temperature level only affects the flower sooner or later, has little effect on the duration of flowering. Indica rice is more sensitive to air humidity than japonica rice, and the average humidity at 07: 01-08: 00,08: 01-09: 00,10: 01-11: 00 and 07: 01-15: 00 is significantly higher than that at indica There was a significant positive correlation between the air humidity and the flowering time. The air humidity had no significant effect on the flowering time of japonica rice. No matter the indica or japonica rice, the air humidity had no significant effect on the flowering duration. The effect of solar radiation intensity on floral traits did not reach significant level.