论文部分内容阅读
云南高寒稻区的地方粳稻品种小麻谷与籼稻细胞质的改良品系南34的正反交F1分别种植于海拔400,1 860和2 200 m的3个点,对6个F2群体的孕穗期耐冷性进行分析。结果表明小穗育性是对低温最敏感的性状,可用作孕穗期耐冷性的评价指标。F2(小麻谷×南34)群体的平均孕穗期耐冷性均极显著高于同一海拔下产生的反交F2群体的表现(P<0.01)。同一组合在2 200 m海拔产生的F2群体平均孕穗期耐冷性均高于其余两海拔产生的群体,其中显著(P<0.05)或极显著(P<0.01)高于在400 m海拔产生的群体。结果明确了杂种F1在高海拔低温条件下传粉产生的后代更耐低温,其中在粳稻细胞质背景下更为明显。在F2(小麻谷×南34)群体中耐冷性状的分布主要是受耐冷基因的作用,然而在其反交F2群体中耐冷性状的分布除受耐冷基因的作用外,还受到籼稻细胞质背景的影响。
The F1 hybrids of Southern 34, an improved japonica rice cultivar with small japonica rice and high yielding indica rice, were planted at three altitudes of 400, 1 860 and 2 200 m respectively in the alpine region of Yunnan. Cold tolerance of 6 F2 populations at booting stage Analyze. The results showed that spikelet fertility was the most sensitive to low temperature and could be used as an indicator of cold tolerance at booting stage. The average booting cold tolerance of F2 population was significantly higher than that of the F2 population (P <0.01) at the same altitude. The average bumper cold tolerance of F2 population from the same combination at 2 200 m altitude was significantly higher than those from the other two altitudes (P <0.05) or significantly (P <0.01) higher than those at 400 m altitude . The results showed that hybrid F1 was more resistant to hypothermia when pollinated at high altitude and low temperature, especially in the cytoplasm of japonica rice. The distribution of cold tolerance traits in F2 population was mainly affected by cold tolerant genes. However, the distribution of cold tolerance traits in F2 population was negatively correlated with the cold tolerance gene and the indica cytoplasmic background .