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木薯自交系后代种质根腐病抗性评价及遗传多样性分析
作者:
作者单位:

1.云南省农业科学院热带亚热带经济作物研究所;2.云南省农业科学院国际农业研究所

基金项目:

云南省农业基础研究联合专项项目（202301BD070001-222）；云南省技术创新人才培养项目（202105AD160041）；国家木薯产业技术体系保山综合试验站（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）；云南省李开绵专家工作站（202305AF150004）


Evaluation of Root Rot Resistance and Analysis of Genetic Diversity in Cassava Inbred Line Germplasms
Author:
Affiliation:

1.Tropical and Subtropical Cash Crops Research Institute,Yunnan Academy of Agricultural Sciences,National Key Laboratory for Biological Breeding of Tropical Crops;2.International Agricultural Research Institute,Yunnan Academy of Agricultural Sciences

Fund Project:

Yunnan Fundamental Research Project(202301BD070001-222)；Yunnan Province Talent Development Program for Technological Innovation(202105AD160041)；The Baoshan Comprehensive Experimental Station of the National Cassava Industry Technology System(CARS-11-YNLGH)；National Key Laboratory for Tropical Crop Breeding(NKLTCB-YAAS-2024-B01)；Yunnan Li Kai Mian Expert Workstation(202305AF150004)

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    摘要:

    通过室内离体鉴定对137份 ‘GR891’ 木薯自交系后代新种质进行抗根腐病评价,并对其中93份抗病种质的主要农艺性状进行变异系数、遗传多样性指数等方面遗传多样性分析。结果表明,137份木薯种质中56份种质表现高抗(40.88%),37份种质表现抗病(27.01%),33份种质表现中抗(24.09%),9份种质表现感病(6.57%),2份种质表现高感(1.46%)。93份木薯抗病种质的10个主要性状变异系数在14.46%～77.63%之间,遗传多样性指数范围在0.60～2.04之间,说明‘GR891’木薯自交系后代中具有丰富的遗传变异。相关性分析表明,3对性状呈极显著相关,3对性状呈显著相关,其中单株鲜薯重与茎粗、单株鲜薯数量呈极显著正相关,相关系数分别为0.490和0.680。主成分分析表明,3个主成分的累计贡献率达74.52%,株高、茎粗、主茎高、单株鲜薯数量和单株鲜薯为木薯表型变异的主要因素。该研究结果可为今后木薯根腐病抗性种质的挖掘及抗性遗传分析提供科学依据。

    Abstract:

    Through in vitro identification, 137 new germplasm inbred lines of cassava cultivar‘GR891’ were evaluated for resistance to root rot. Additionally, genetic diversity analysis, including variance coefficients and genetic diversity indices, was conducted on the main agronomic traits of 93 resistant germplasm lines. The results showed that among the 137 cassava germplasm lines, 56 lines exhibited high resistance (40.88%), 37 lines showed resistance (27.01%), 33 lines were moderately resistant (24.09%), 9 lines were susceptible (6.57%), and 2 lines were highly susceptible (1.46%). The variation coefficients of the ten main traits of the 93 resistant cassava lines ranged from14.46% to 77.63%, and the genetic diversity indices ranged from 0.60 to 2.04, indicating a rich genetic variation in the inbred line progeny of ‘GR891’. Correlation analysis revealed that three pairs of traits were extremely significantly correlated, and three pairs were significantly correlated. The fresh tuber weight per plant showed a highly significant positive correlation with stem diameter and fresh tuber number per plant, with correlation coefficients of 0.490 and 0.680, respectively. Principal component analysis indicated that the cumulative contribution rate of the three principal components reached 74.52%, with plant height, stem diameter, main stem height, fresh tuber number per plant, and fresh tuber weight being the main factors influencing the phenotypic variation in cassava. These findings provide a scientific basis for the exploration of resistant germplasm against cassava root rot and for the genetic analysis of resistance.

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  • 收稿日期:2024-10-24
  • 最后修改日期:2024-11-29
  • 录用日期:2024-12-05
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