Study on Heat Tolerance of Chieh-qua Varieties at Seedling Stage
To analyze the differences of heat resistance of different Chieh-qua germplasm materials and screen heat-resistant Chieh-qua materials,21 Chieh-qua germplasm materials were used as experimental materials,and the relative electrical conductivity(REC),relative chlorophyll content(SPAD value),superoxide dismutase(SOD)activity,malondialdehyde(MDA)and proline(Pro)content and root activity(RA)of seedling leaves were measured after 5 days under high temperature stress.Principal component analysis,cluster analysis and regression analysis were used to comprehensively evaluate its heat resistance.The results showed that 21 Chieh-qua germplasm materials could be divided into three categories.The first category was materials with good heat resistance,which included FJ1728,G-2-1-1,T-12,D-2-1-3,FJ1729.The second category was materials with medium heat resistance,which included FJ43,025-2-1,FJ0401,FJ1732,FJ29,E-1,C-3-1,FJ50,FJ1731-2.The third category was materials with weak heat resistance,which included F-2,B-4,FJ27,FJ44,FJ14,PJ1749,T-7.Its comprehensive evaluation model of heat resistance was established as D=0.546-0.230×REC+0.326×SPAD value+0.031×SOD activity+0.029×MDA content.The results of this study could provide a scientific basis for the innovation of chieh-qua germplasm and the selection and the breeding of heat-resistant varieties.
万方数据
维普
