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陈炙, 丁婷, 黄振, 等. 紫薇种内杂交可配性与抗白粉病种质筛选[J]. 四川林业科技, 2023, 44（5）: 82−88. DOI: 10.12172/202212050003
引用本文: 陈炙, 丁婷, 黄振, 等. 紫薇种内杂交可配性与抗白粉病种质筛选[J]. 四川林业科技, 2023, 44（5）: 82−88. DOI: 10.12172/202212050003
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CHEN Z, DING T, HUANG Z, et al. Compatibility of intraspecific hybridization and screening of powdery mildew resistent germplasm in Lagerstroemia indica[J]. Journal of Sichuan Forestry Science and Technology, 2023, 44(5): 82−88. DOI: 10.12172/202212050003
Citation: CHEN Z, DING T, HUANG Z, et al. Compatibility of intraspecific hybridization and screening of powdery mildew resistent germplasm in Lagerstroemia indica[J]. Journal of Sichuan Forestry Science and Technology, 2023, 44(5): 82−88. DOI: 10.12172/202212050003
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紫薇种内杂交可配性与抗白粉病种质筛选

Compatibility of Intraspecific Hybridization and Screening of Powdery Mildew Resistent Germplasm in Lagerstroemia indica

    摘要
  • 摘要: 以红火箭、红火球和红叶3个美国紫薇品种和四川粉花紫薇、四川白花紫薇两个四川本地紫薇品种为亲本进行种内杂交，调查坐果率、结实率和种子萌发率等3个种实性状，测定了3个种实性状的遗传力，性状之间的相关遗传力和相关系数；采用孢子悬浮液侵染法对子代进行了病菌接种，根据子代病情分级筛选抗白粉病的杂交组合。结果表明：（1）杂交组合子代的种实性状均在显著性差异，且均显著低于自由授粉子代。（2）12个杂交组合收获了种子，其中只有8个杂交组合种子能萌发，因此紫薇杂交设计需充分考虑亲本搭配。（3）三个种实性状的遗传力均在0.99以上，坐果率与结实率、萌芽率的相关遗传力均在0.8以上，采用坐果率性状提前选择结实率和萌芽率性状的效率分别达88.37%、84.47%。（4）8个杂交组合子代白粉病抗性试验发现，部分“美中”组合杂交子代的抗性表现好，而部分表现很差，其中“红火箭×四川粉花紫薇”杂交组合F1代抗性表现最佳，参试子代均为抗病类型，抗性表现次佳的为“红火箭×四川白花紫薇”杂交组合，而“四川粉花紫薇×美国红叶紫薇”杂交组合F1代抗性表现最差。本地品种杂交子代表现均衡。（5）初步筛选出8株免疫株，25株高抗株。相关研究发掘的抗白粉病杂交组合和抗病类型为紫薇抗性育种提供材料基础。

     

    Abstract: Three American Lagerstroemia indica varieties (Red Rocket, Red Fireball and Red Leaf) and two Sichuan native Lagerstroemia indica varieties (Sichuan Pink Flower and Sichuan White Flower) were used as parents for intraspecific hybridization. Three seed traits, including fruit setting rate, seed setting rate and seed germination rate, were investigated, and the heritability, correlation heritability and correlation coefficient of the three seed traits were determined. The progeny were inoculated by the spore suspension infection method, and the hybrid combinations resistant to powdery mildew were screened according to the disease classification of the progeny. The results showed that: (1) There were significant differences in seed and fruit characters of hybrid progeny, and they were significantly lower than those of open pollinated progeny. (2) The seeds of 12 hybrid combinations were harvested, and only 8 of them could germinate. Therefore, parental collocation should be fully considered in Lagerstroemia indica hybrid design. (3) The heritability of fruit and seed traits was all above 0.99, and the correlation heritability of fruit setting rate with seed setting rate and germination rate was all above 0.8. The efficiency of early selection of seed setting rate and germination rate by using fruit setting rate traits was 88.37% and 84.47%, respectively. (4) The powdery mildew resistance test of the offspring of 8 hybrid combinations showed that some hybrid progenies of Sino-American combination was good, while others were very poor. The F1 generation of the hybrid combination "Red Rocket × Sichuan White Flower" showed the best resistance, all the tested progenies were resistant to the disease, and the hybrid combination of "Red Rocket × Sichuan White Flower" showed the second best resistance. However, the F1 generation of "Sichuan Pink Flower × American Red Leaf" had the worst resistance. The hybrid of local varieties represent equilibrium. (5) Initially, 8 immune plants and 25 highly resistant plants were screened out. The hybrid combinations and disease-resistant types of powdery mildew resistance discovered in this study provide the material basis for Lagerstroemia indica resistance breeding.

     

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