春播谷子成熟期抗倒伏性研究

试验以长谷4号、长生13和晋谷21为材料,在成熟期（乳熟期、蜡熟期和完熟期）测定7个性状指标,分析其与倒伏性的关系。结果表明,3个品种的倒伏指数均以黄熟期最大,乳熟期最小;从基部第2节间~第6节间,倒伏指数依次增加,抗倒伏性依次降低。相关性分析表明,基部第2节间倒伏指数与重心高度和单株穗鲜重呈显著正相关,与株高、单株鲜重和基部第2节间长度呈正相关,与基部第2节间直径和基部第2节间机械强度呈负相关,但都未达到显著水平。通径分析结果表明,各性状对倒伏指数的直接影响从大到小排序为：基部第2节间机械强度、单株鲜重、重心高度、株高、基部第2节间直径、基部第2节间长度和单株穗鲜重。由研究结果可见,基部第2节间机械强度和重心高度可作为评价谷子成熟期抗倒伏性的通用指标,对选育抗倒伏谷子新品种具有重要指导意义。

Study of Lodging Resistance of Spring-Sowing Foxtail Millet in Maturity Stages

Changgu 4,Changsheng 13 and Jingu 21 were studied as materials in this experiment, the correlation of seven character indexes with lodging resistance at maturity stages (milk-ripe stage, waxy-ripe stage and yellow maturity stage) were analyzed. The results indicated that the lodging index of three varieties was the highest in yellow maturity stage and the lowest in milk-ripe stage. Lodging index increased gradually with increase of internodes (primary internode from two to six) whereas lodging resistance decreased stepwise. Correlation analysis showed that a significant positive correlation between lodging index of the second internode and height of the center of gravity, fresh weight of spike per plant existed. Some positive correlation existed between lodging index of the second internode and plant height, length of the second internode and fresh weight per plant, but a negative correlation existed between lodging index of the second internode basal and the diameter of the second internode basal, the mechanical strength of the second internode basal. Though they both didn’t reach significant level. Path analysis showed that those relevant traits had a direct effect on lodging index of the second internode from stronger to weaker followed the trend: mechanical strength of the second internode, fresh weight per plant, height of the center of gravity, plant height, the diameter of the second internode basal, length of the second internode basal and fresh weight of spike per plant. The results indicated that mechanical strength of the second internode basal, fresh weight per plant and height of the center of gravity were important traits parameter to evaluate crop-stem lodging resistance with the growing of millet, which has the extremely vital significance for selective lodging resistance breeding of the new millet cultivar.