Evaluation of the Low-Temperature Tolerance of Cotton Varieties in the Huang-Huai Region during Seed Germination |
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Institution: | 1.Cotton Research Center, Shandong Academy of Agricultural Sciences/Key Laboratory of Cotton Breeding and Cultivation in the Huang-Huai-Hai Plain, Ministry of Agriculture, Jinan 250100, China; 2. College of Agronomy, Shandong Agricultural University/State Key Laboratory of Crop Biology/Shandong Key Laboratory of Crop Biology, Tai’an, Shandong 271018, China |
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Abstract: | Objective] To provide a theoretical foundation and germplasm resources for low-temperature-germination cotton breeding, the germination characteristics of 38 cotton varieties novel to or formerly widely planted in the Huang-Huai Region were evaluated under different low temperature stress conditions. Method] Analysis of variance, the fuzzy membership function method, and cluster analysis were used to comprehensively evaluate the tolerance of these varieties to low temperature stress. Result] As the temperature was lowered, germination rate, germination index, and vigor index exhibited a decreasing trend in all cotton varieties, but resistance to low temperature was significantly different among varieties. Cluster analysis divided the 38 varieties into three categories: highly resistant, resistant, and non-resistant. Conclusion] Early-introduced varieties and those bred from early-introduced germplasm resources had weaker resistance to low temperature stress, with Stoneville and Deltapine series showing the lowest tolerance. The new transgenic insect-resistant cotton varieties SCRC 37 and SCRC 36 had the strongest resistance to low temperature stress. |
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Keywords: | cotton low temperature tolerance seed germination adversity resistance coefficient Huang-Huai Region |
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