播期对K型不育系K_(19)A生育特性的影响及赤霉素施用的效果

INFLUENCE OF SOWING DATES ON GROWTH TRAITS OF K-TYPE CMS LINE K_(19)A,AND THE EFFECTOF APPLING GA_(3)

分期播种和应用赤霉素（GA3）5种剂量对K19A和珍汕97A进行试验,结果表明:1.主茎叶片数、播始历期、有效积温在不同播期都有不同程度变异,K19A播期的确定和花期的预测以变异小的叶差为主,温差作校正,时差作参考。2.对K19A施用GA3,存在经济学最佳剂量。并对施用GA3后K19A的形态指标作了探讨。

This paper dealt with the influence of different sowing dates on growth traits and the effect of appling GA3 with 5 doses on reproduction of K-type CMS lines K19A. The results showed that the period from sowing to initial heading, the effective accumulative temperature (EAT. ) and the leaf number of main stem of K19A varied with different sowing dates. The effect of putting off sowing date on K19A was different from that on Zhen ahan 97A. However, the leaf number of main stem was stable mostly. Thus, sowing date and predicting flowering date should be decided mainly refering to the leaf number of main stem. It was found that 150g/ ha. of GA3 for K19A reproduction was the best dose. In addition, the morphologic criteria for GA3 spraying dose were disacussed.