木薯自交后代疫霉根腐病抗性评价及抗性材料遗传多样性分析
Evaluation of Phytophthora Root Rot Resistance and Genetic Diversity Analysis of Resistant Materials in Cassava Inbred Progeny
摘要
Abstract
The excised root tissue inoculation method was used to evaluate resistance to cassava root rot caused by Phytophthora in 137 inbred progen GR891 cassava samples.Genetic diversity analysis,including the coefficient of variation and genetic diversity indices,was conducted on 93 samples exhibiting high or moderate resistance at 10 key agronomic traits.Results showed that among the 137 samples,56 exhibited high resistance(40.88％),37 showed resistance(27.01％),33 were moderately susceptible(24.09％),9 were susceptible(6.57％),and 2 were highly susceptible(1.46％).In the 93 resistant samples,the coefficients of variation for 10 main agronomic traits ranged from 14.46％to 77.63％,with genetic diversity indices between 0.60 and 2.04,indicating abundant genetic variation in the resistant progeny of GR891.Correlation analysis revealed three pairs of traits with highly significant correlations and three pairs with significant correlations.Fresh tuber weight per plant was significantly positively correlated with stem diameter and tuber number per plant,with correlation coefficients of 0.490 and 0.680,respectively.Principal component analysis identified plant height,stem thickness,main stem height,tuber number per plant,and fresh tuber weight per plant as the primary features of phenotypic variation in cassava,with the cumulative contribution rate of the three principal components reaching 74.52％.Cluster analysis suggested three major categories:Category Ⅰ,including 7 materials which have relatively poor performance at traits;Category Ⅱ,characterized by superior overall traits with outstanding performance in yield traits and disease resistance,showing high potential for utilization and including 4 materials;and Category Ⅲ,comprising 82 materials,with Subgroup Ⅲa exhibiting good traits and disease resistance as well as significant potential for high yield,including 9 materials.This study provides scientific evidence for selecting cassava germplasm resistant to Phytophthora root rot and informs genetic analysis for resistance traits.关键词
GR891木薯/自交后代/根腐病/抗性评价Key words
GR891 cassava/inbred progeny/root rot disease/resistance evaluation引用本文复制引用
段春芳,车彬,张钦,李林虹,严炜,刘光华,李月仙,宋记明,姜太玲,肖明昆,沈正松,刘倩,熊贤坤,耿沙..木薯自交后代疫霉根腐病抗性评价及抗性材料遗传多样性分析[J].植物遗传资源学报,2025,26(6):1166-1176,11.基金项目
云南省农业基础研究联合专项项目(202301BD070001-222) （202301BD070001-222）
云南省技术创新人才培养项目(202105AD160041) （202105AD160041）
国家木薯产业技术体系保山综合试验站(CARS-11-YNLGH) （CARS-11-YNLGH）
热带作物生物育种全国重点实验室科研项目(NKLTCB-YAAS-2024-B01) （NKLTCB-YAAS-2024-B01）
云南省李开绵专家工作站(202305AF150004) （202305AF150004）
保山市科技计划项目(2023bskj019)Yunnan Fundamental Research Project(202301BD070001-222) （2023bskj019）
Yunnan Province Talent Development Program for Technological Innovation(202105AD160041) （202105AD160041）
The Baoshan Comprehensive Experimental Station of the National Cassava Industry Technology System(CARS-11-YNLGH) （CARS-11-YNLGH）
National Key Laboratory for Tropical Crop Breeding(NKLTCB-YAAS-2024-B01) （NKLTCB-YAAS-2024-B01）
Yunnan LI kaimian Expert Workstation(202305AF150004) （202305AF150004）
Baoshan City Science and Technology Plan Project(2023bskj019) （2023bskj019）
