稻曲病发病程度与水稻株型的相关性

Relationship between False Smut of Rice and plant traits of rice

采用6个对稻曲病抗感程度不同的水稻品种(组合),调查稻曲病发病率、严重度并计算损失率。同时测量一次枝梗数、二次枝梗数及着粒密度等穗部性状,并考察剑叶角度、剑叶长和株高等株型性状。将结果进行相关性分析,认为稻曲病的发生存在着显著的品种间差异,发病率与穗部性状关系密切,相关性大小为着粒密度>每穗粒数>二次枝梗数,发病率与穗长、剑叶角度、穗弯曲度、剑叶长度呈极显著或显著的负相关。提出在株型育种中应注意选择一次枝梗数较多的偏散穗、长弯穗型,避免选用二次枝梗数过多的资源。

Six varieties were compared on incidence, severity and loss rate of false smut of rice (FSR). Number of first twigs, number of second twigs and grain density were measured. Angle and length of flag leaf, plant height were investigated, too. Correlation analysis shows that there are great differences among varieties in incidence of FSR. The disease incidence is closely related with panicle traits. The correlation rate is arranged like this: grain density>grains per panicle>numbers of second twig. The incidence has a significantly negative relationship with panicle length, flag leaf angle, panicle curve, flag leaf length. In plant type breeding, loose panicle, long curve panicle varieties with more first twigs should be paid more attention, while those resource with too much second twigs should be avoid beforehand.