Selection and Analysis of Disease-Resistant Germplasms in Hybrid F<sub>1</sub> Generations of Rubber Tree
Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2023, Vol. 44 ›› Issue (11): 2281-2291.DOI: 10.3969/j.issn.1000-2561.2023.11.017

• Germplasm Resources, Genetics & Breeding • Previous Articles     Next Articles

Selection and Analysis of Disease-Resistant Germplasms in Hybrid F1 Generations of Rubber Tree

LI Boxun1,2, HUANG Guixiu1,*(), HE Ligang3, CAI Jimiao1, FENG Yanli1, YU Wencai3, LIU Zhongliang3   

  1. 1. Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences / Key Laboratory of Integrated Pest Management on Tropical Grops, Ministry of Agriculture and Rural Affairs / Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests, Haikou, Hainan 571101, China
    2. College of Plant Protection, Yunnan Agricultural University, Kunming, Yunnan 650201, China
    3. Yunnan Institute of Tropical Crops, Jinghong, Yunnan 666100, China
  • Received:2023-07-03 Revised:2023-09-07 Online:2023-11-25 Published:2023-12-08
  • Contact: *HUANG Guixiu,E-mail:hgxiu@vip.163.com

Abstract:

Corynespora leaf fall disease is one of the most severe leaf diseases in major rubber planting countries worldwide, which can cause serious yield and economic losses. The selection, creation, and utilization of resistant germplasms are the most effective prevention and control strategies for this disease. This study evaluated the disease resistance of 821 F1 populations from three hybrid combinations Yunyan 277-5×IAN 873, RRIC103×Reyan 8-79, Yunyan 277-5×Reken 525 and identified the level of disease resistance. Based on the evaluation results of disease resistance, 32 candidate F1 generation individual plants were selected from two hybrid combinations that conform to normal distribution. Using three divergent clusters of Corynespora cassiicola and two evaluation methods to identify the resistant candidate F1 clone seedlings, five resistant germplasms were ultimately obtained by measuring the activity of defense enzymes and analyzing the expression characteristics of disease-related genes in five new resistant germplasms. Further investigation confirmed that the interaction relationship between five new resistant germplasms and multi host C. cassiicola during the infection process. This study provides excellent germplasm materials and a theoretical support for the early selection, cultivation, and utilization of resistant germplasms for the disease resistance of Corynespora leaf fall disease.

Key words: rubber tree, Corynespora leaf fall disease, hybrid F1 generations, selection, disease resistance

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