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Investigation on Various Aboveground Traits to Identify Drought Tolerance in Cowpea Seedlings

文献类型： 外文期刊

作者： Ravelombola, Waltram 1 ; Shi, Ainong 1 ; Qin, Jun 1 ; Weng, Yuejin 1 ; Bhattarai, Gehendra 1 ; Zia, Bazgha 1 ; Zhou, W 1 ;

作者机构： 1.Univ Arkansas, Dept Hort, Fayetteville, AR 72701 USA

2.Hebei Acad Agr & Forestry Sci, Natl Soybean Improvement Ctr Shijiazhuang Subctr, North China Key Lab Biol & Genet Improvement Soyb, Minist Agr,Cereal & Oil Crop Inst, Shijiazhuang 050031, Hebei, Peoples R China

3.USDA ARS, Crop Improvement & Protect Res Unit, 1636 E Alisal St, Salinas, CA 93905 USA

关键词： cowpea; germplasm; evaluation; drought; seedling; Vigna unguiculata

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

ISSN： 0018-5345

年卷期： 2018 年 53 卷 12 期

页码：

收录情况： SCI

摘要： Impacts of drought stress on crop production can significantly impair farmer's revenue, hence adversely impacting the gross national product growth. For cowpea [Vigna unguiculata (L.) Walp.], which is a legume of economic importance, effects of drought at early vegetative growth could lead to substantial yield losses. However, little has been done with respect to breeding for cowpea cultivars withstanding drought at early vegetative growth. In addition, previous investigations have focused on how plant morphology and root architecture can confer drought tolerance in cowpea, which is not sufficient in efforts to unravel unknown drought tolerance-related genetic mechanisms, potentially of great importance in breeding, and not pertaining to either plant morphology or root architecture. Therefore, the objective of this study was to evaluate aboveground drought-related traits of cowpea genotypes at seedling stage. A total of 30 cowpea genotypes were greenhouse grown within boxes and the experimental design was completely randomized with three replicates. Drought stress was imposed for 28 days. Data on a total of 17 aboveground-related traits were collected. Results showed the following: 1) a large variation in these traits was found among the genotypes; 2) more trifoliate wilt/chlorosis tolerance but more unifoliate wilt/chlorosis susceptible were observed; 3) delayed senescence was related to the ability of maintaining a balanced chlorophyll content in both unifoliate and trifoliate leaves; and 4) the genotypes PI293469, PI349674, and PI293568 were found to be slow wilting and drought tolerant. These results could contribute to advancing breeding programs for drought tolerance in cowpea.

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