杂交稻在贮藏期对麦蛾感虫性的研究

STUDIES ON THE SUSCEPTIBILITY OF HYBRID RICETO THE ANGOUMOlS GRAIN MOTH DURING STORAGE

杂交稻在贮藏期受麦蛾为害常表现为感虫，其感虫比例明显高于常规稻。杂交稻感虫的原因主要由于谷粒的裂颖率高，有利于初孵幼虫的入侵。裂颖率与成虫羽化率、稻谷损失率呈极显著的正相关（ｐ＜０．００１），而与敏感度系数呈很显著的正相关（ｐ＜０．０１）。换言之，裂颖率越高，感虫性越大；反之，抗性增强。不育系的感虫性可能是造成杂交稻感虫的主要原因。发展新的抗虫不育系和选用具有显性抗虫基因的恢复系作为抗源，可能会提高杂交稻的抗性。

The Angoumois grain moth(AGM),Sitotroga cerealella Olivier ,severely infes-ed the stored grain of hybrid rice ,of which the susceptibility ratio was larger than the regu-lar rice.Because the hybrid rice usually had high percen tage of gaping glumes ,the newlyhatched larvae of A GM easily penetrated into the seeds.Highly significant positive correla-tion(P<0.001) between the percentage of gaping glumes and the emerging adults ,orgrain loss was found,and a significant positive correlation(P<0.05)between the gapingglumes and susceptibility index also existed. The percentage of gaping glumes increased withsusceptibility increasing and vice versa. The cytoplasmic male sterility(CMS)line susceptibleto AGM was the major factor affecting the susceptibility of hybrid rice.Development of thenew resistant CMS or restorer line with the resistance controlled by dominant gene could in-crease the resistance of hybrid rice to stored insects.