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以6个玉米F1代杂交组合(DF-1×DF-2,DF-1×DF-3,DF-1×DF-4,DF-2×DF-3,DF-2×DF-4,DF-3×DF-4)为材料,研究了密度、组合方式和农艺性状对玉米F1代杂交组合成熟期茎秆倒伏率的影响。结果表明密度和茎秆倒伏率之间存在极显著的正相关关系,相关系数为0.25;随着种植密度的增大,6个F1代杂交组合中4个组合茎秆倒伏率显著的增加,而2个组合茎秆倒伏率增加不显著;组合方式对玉米茎秆倒伏具有显著的影响,自交系DF-1组配的3个F1代杂交组合茎秆倒伏率居于前3位,105 000株/公顷密度时DF-1×DF-3和DF-1×DF-4的茎秆倒伏率分别为94.64%和62.80%,这表明自交系DF-1可能含有致F1代杂交组合茎秆倒伏的基因;茎秆倒伏率与株高、穗位高和穗上节间数之间经相关分析达到极显著水平,与茎粗之间经相关分析达到显著水平,而与穗下节间数、穗叶宽、穗上叶宽和穗下叶宽之间的相关性未达到显著水平。研究认为,自交系DF-1可能含有致F1代杂交组合茎秆倒伏的基因,可用于抗茎倒基因定位及基因挖掘研究;随着种植密度的增大,2个杂交组合茎秆倒伏率增加不显著,这表明通过高密度筛选获得抗倒耐密的F1代杂交组合是完全可行的。
Six hybrid F1 combinations (DF-1 × DF-2, DF-1 × DF-3, DF-1 × DF-4, DF-2 × DF-3, DF- -3 × DF-4) were used to study the effect of density, combination and agronomic traits on the stem lodging rate in F1 hybrids of mature maize. The results showed that there was a significant positive correlation between density and stem lodging rate, with a correlation coefficient of 0.25. With the increase of planting density, the lodging stalk ratio of 4 combinations in 6 F1 hybrids increased significantly, The combination lodging had significant effects on the lodging of corn stalks. The lodging resistance of the three F1 hybrids in inbred line DF-1 was in the top three and 105 000 The lodging rates of stems of DF-1 × DF-3 and DF-1 × DF-4 were 94.64% and 62.80% at the density of 1 hectare per hectare, indicating that the inbred line DF-1 may contain stalk lodging The stem lodging rate was significantly correlated with plant height, panicle height and panicle internode by correlation analysis, and significant correlation with stem diameter was obtained by correlation analysis, The correlation between panicle width, panicle width at panicle and panicle width under panicle did not reach significant level. The results showed that inbred lines DF-1 may contain down-regulated genes of F1 hybrids, which can be used to locate anti-stem down-genes and study on gene-digging. With the increase of planting density, the stem lodging ratio The increase is insignificant, which shows that it is totally feasible to obtain the lodging-resistant hybrid F1 generation by high-density screening.