低磷胁迫对不同基因型玉米产量性状的影响

在大田选取21份玉米自交系，设置2个供磷水平研究磷对不同基因型玉米产量性状的影响。结果表明：①低磷胁迫加大了不同基因型玉米之间产量性状的差异。②以减产率为标准，对不同玉米基因型的磷效率进行分类，磷高效类型的玉米自交系，其磷响应度较低(6．92)，而磷低效类型其磷响应度都较高(25．60)，减产率和磷响应度的相关性达到极显著水平(r=0．9037^**)。

EFFECT OF LOW- PHOSPHORUS STRESS ON YIELD-CONTRIBUTING CHARACTERS OF DIFFERENT MAIZE GENOTYPES

Twenty-one maize inbred lines were grown in a field experiment and supplied with high and low P rates. Low phosphorus stress enlarged the variation between different genotypes in their major yield-contributing characters. Classification of the inbred lines on their P use efficiency based on their yield reduction percentage showed that high P use efficient genotypes had relatively low response to P, averaging 6.92, while the response to P was much higher in low P use efficient genotypes, averaging 25.60. Correlation analysis showed that yield reduction percentage was highly significantly correlated with P response, r being 0.9037~(**).