| In order to screen the identification indices for heat resistance of wheat and promote the identification and utilization of heat-resistant varieties(lines), 32 new wheat lines were used as materials, and heat stress was carried out during the two-leaf seedling stage. After heat stress, 14 morphological and physiological characters such as seedling height and root length were investigated, and heat resistance coefficients of each character were calculated. Principal component analysis and cluster analysis were performed. The results showed that heat stress had significant effects on the 12 traits: seedling height, chlorophyll content, electrical conductivity, fresh weight of seedling, dry weight of seedling, root dry weight, dry weight ratio of root to shoot, maximum root length, total root length, root surface area, root diameter and root tip number, and the correlation coefficients between heat resistance traits were significant. The electrical conductivity was significantly correlated with fresh and dry weight of seedling (P<0.05). Three principal components were extracted through principal component analysis, and the contribution rate reached 82.982%, which mainly reflected the indicators such as seedling height, electrical conductivity, seedling dry weight, root shoot ratio of dry weight, total root length and root surface area. The comprehensive heat resistance index H value of each line was calculated by the membership function method and cluster analysis was carried out to screen the new heat resistance wheat lines such as Xinong 902-1 and Xinong 902-2, which laid a foundation for their further utilization. |
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