| To comprehensively evaluate the heat tolerance of green-petiole,non-heading cabbage seedlings,10 germplasm materials were exposed to high-temperature stress in a light incubator. The effects of high-temperature stress on seedling growth and physiological parameters were analyzed using the heat damage index and the affiliation function method.The results indicated that high-temperature stress generally reduced growth parameters,including plant height,plant width,dry and fresh weight,and the root-to-shoot ratio of seedlings. At the same time,high-temperature stress also increased relative conductivity,proline content,superoxide dismutase,catalase activities,and malondialdehyde content while decreasing soluble protein content in green-petiole,non-heading cabbage seedlings.Based on clustering analysis using the heat damage index and the affiliation function method,two highly heat-tolerant materials (22XS15,22XS156) and two heat-sensitive materials (22XS44,22XS56) were identified. |
