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Screening the USDA Watermelon Germplasm Collection for Drought Tolerance at the Seedling Stage

文献类型： 外文期刊

作者： Zhang, Haiying 1 ; Gong, Guoyi 1 ; Guo, Shaogui 1 ; Ren, Yi 1 ; Xu, Yong 1 ; Ling, Kai-Shu 2 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Natl Engn Res Ctr Vegetables, Beijing 100097, Peoples R China

2.ARS, USDA, US Vegetable Lab, Charleston, SC 29414 USA

关键词： genetic material;germplasm collection;crop breeding;rootstock breeding;water stress condition;drough tolerance;USDA screening

期刊名称：HORTSCIENCE （ 影响因子：1.455； 五年影响因子：1.617 ）

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收录情况： SCI

摘要： Because of the growing threat of global warming, drought stress could severely affect the normal growth and development of crop plants. To alleviate such an adverse effect, there is a need to screen watermelon germplasm collections to identify genetic sources for potential drought tolerance. In the present study, 820 accessions of USDA's Citrullus PIs and 246 watermelon breeding lines were evaluated for their drought tolerance at the seedling stage under extreme water stress conditions in a greenhouse. Significant variations in drought tolerance were observed in the Citrullus germplasm collections. Using fast clustering analysis, the tested watermelon materials could be assigned into four groups, including tolerant, intermediate tolerant, moderately sensitive, and sensitive, respectively. The most drought-tolerant Citrullus germplasm, including 13 Citrullus lanatus var. lanatus and 12 C. lanatus var. citroides accessions, were originated from Africa. These genetic materials could be used for rootstock breeding or for developing drought-tolerant watermelon cultivars.

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