紫薇种子辐射变异和抗性初步研究

Variation and Resistance of Lagerstroemia indica Seed Under Radiation

为了研究辐射对紫薇种子的影响及选育抗白粉病新品种,以不同剂量的60Co-γ射线处理紫薇种子并对部分植株进行了扦插对比试验,对出苗率、长雄蕊变异、抗性及生长量进行了调查。结果表明,辐射处理可以显著地抑制种子的出苗率;对长雄蕊瓣化现象具有一定的促进作用;在辐射的‘六月飞雪’中,发现了2株对白粉病抗性极强的植株,其他调查植株全部染病;抗病1号表现为对白粉病免疫,抗病2号表现为高抗,‘四海升平’表现为中感,‘六月飞雪’和‘红火箭’均表现为高感;同时发现2株抗病植株的株高及地径均高于不抗病植株,且抗病植株的落叶期明显晚于不抗病植株。

In order to study the effect of radiation on the Lagerstroemia indica seed and select new varieties with resistance to powdery mildew, the seeds were treated by 60Co-y radiation and contrast tests were carried out using cutting seedlings, the emergence rate, long stamens petalody, resistance and growth were investigated. The results showed that radiation treatment could significantly inhibit the emergence rate and had a certain role in promoting the petalody of long stamens. There were two plants with strong resistance to powdery mildew among the plants of Lagerstroemia inclica ＇ Liuyue Feixue＇ that were radiated, and the others were infected with powdery mildew. Kangbing No.1 was immune to powdery mildew, and Kangbing No.2 showed high resistance to powdery mildew, ＇Sihai Shengping＇ was moderately sensitive to powdery mildew, ＇Liuyue Feixue＇ and ＇Redrocket＇ were highly sensitive to powdery mildew. The plant height and ground diameter of the two disease-resistant plants were higher than those of the non disease-resistant plants, and the leaf fall period of disease-resistant plants were significantly later than that of non disease-resistant plants.