热带作物学报2024，Vol.45Issue(4)：691-702,12.DOI:10.3969/j.issn.1000-2561.2024.04.005
28份木薯种质苗期耐水淹性初步评价
Preliminary Evaluation of Waterlogging Tolerance of Twenty-eight Cassava Accessions at Seedling Stage
摘要
Abstract
Cassava(Manihot esculenta Crantz)is the third largest food crop in the tropics and is the food ration of nearly 600 million people in the world.Cassava is mainly cultivated in tropical regions,where often damaged by waterlogging in rainy season,which leads to serious decline in yield and quality.Therefore,it is important for selecting cassava germplasm resources with high waterlogging-resistance.In this study,a pot experiment was carried out,and plant height increment,relative chlorophyll content(SPAD),relative conductivity,superoxide dismutase(SOD),peroxidase(POD),and catalase(CAT)of 28 cassava germplasm resources were measured under waterlogging stress treatment after 6 days.Variance,correlation analysis,principal component analysis and subordinate function analysis were used to evaluate waterlogging resistance and screen the waterlogging tolerant germplasms at the seedlings stage.The waterlogging tol-erance of 28 cassava germplasms had great difference and the response mechanism of different cassava germplasms to waterlogging stress showed huge difference among the 28 germplasm resources.There were significant positive corre-lation between plant height increment and relative chlorophyll content(P<0.01),and the correlation coefficient was 0.253.There were negative correlation coefficient between the relative chlorophyll content with relative conductivity of 0.266(P<0.01).Principal component analysis using 6 indexes indicated that the 4 principal components accounted for 82.85%of accumulative contribution rates among the germplasms.The main factors were CAT,plant height increment,SOD,and relative chlorophyll content,respectively.According to subordinate function analysis,waterlogging tolerance of the germplasms from high to low was Qiongzhong 1,SC6068,SC201,ME191,M-F532,GR891,C222,GR3,F2000,Luoyong 80,46-12,GR5,KU58,H660,SC5,F03P,M-GR911,CH20,M-F671,COL713,Boss 2,JG1301,GR911,E407,F274,SC8,M-SC5,Thailand.The results of this study would provide basic materials for the breeding of new varieties of cassava with high waterlogging-tolerance and for the future research of cassava waterlogging tolerance mechanism.关键词
木薯/种质/耐水淹性/生理响应/隶属函数分析Key words
cassava/germplasm/waterlogging tolerance/physiological response/subordinate function analysis分类
农业科技引用本文复制引用
刘慧转,曹敏,唐丽,宋记明,李均一,冯亚亭,骆凯,陈银华..28份木薯种质苗期耐水淹性初步评价[J].热带作物学报,2024,45(4):691-702,12.基金项目
海南省自然科学基金项目(No.320QN193) （No.320QN193）
国家木薯产业体系生物防治与综合防控岗位科学家专项(No.CARS-11-hncyh). （No.CARS-11-hncyh）
