大花紫薇新品种‘紫婵’ 雌性不育的显微结构及营养生理特征

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中图分类号：S685.99 文献标志码：A 文章编号：1001-411X（2025）06-0907-08

Abstract： 【Objective】To elucidate the mechanism underlying female sterility in the new Lagerstroemia speciosa cultivar ‘Zichan'，and to provide a theoretical basis for the utilization and innovation ofLagerstroemia germplasm resources. 【Method】 Histological analysis was employed to observe the morphological structure of embryo sac development in L. speciosa ‘Zichan'，and physiological and biochemical approaches were used to assesstigma receptivity， nutrient content and enzyme activity in flower buds. 【Result】 In L. speciosa ‘Zichan'， the megaspore mother cels ceased embryo sac development after the formation of eight-nucleate embryo sac， accompanied by the degradation of egg cels and synergids. The embryo sac became vacuolated and eventually degenerated. In comparison with fertile L. speciosa，L. speciosa ‘Zichan’ flower buds accumulated lower levels of soluble sugarsand starch at corresponding developmental stages，whereas the soluble protein content was higher during the mature embryo sac stage. At the eight-nucleate and embryo sac degradation stages， the superoxide dismutase （SOD） activity in L .speciosa‘Zichan’ was significantly lower than that in L .speciosa by 66.14% and 40.20% respectively， the peroxidase （POD） activity was significantly higher by 139.20% and 348.65% respectively （P<0.05） ， and the catalase （CAT） activity showed a decreasing trend， opposite to that observed in L . speciosa. 【Conclusion】 Female sterility in L. speciosa ‘Zichan’ is attributed to the degeneration and collapse of the embryo sac following the eight-nucleate formation stage.It is speculated that insufcient nutrient accumulation and abnormal antioxidant enzyme levels in flower buds may represent intrinsic sterility factors.

Key Words： Lagerstroemia speciosa; Lagerstroemia speciosa ‘Zichan'; Female sterility; Microstructure; Nutritional characteristic

大花紫薇Lagerstroemiaspeciosa属千屈菜科Lythraceae紫薇属Lagerstroemia植物，其花大色艳，在园林绿化中广泛应用[，但因其结果量大且宿存长，严重影响花后景观。（剩余13517字）