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Selection Criteria for Drought-Tolerant Bread Wheat Genotypes at Seedling Stage

文献类型： 外文期刊

作者： Ahmed, Hafiz Ghulam Muhu-Din 1 ; Sajjad, Muhammad 2 ; Li, Mingju 3 ; Azmat, Muhammad Abubakkar 1 ; Rizwan, Muham 1 ;

作者机构： 1.Univ Agr Faisalabad, Dept Plant Breeding & Genet, Sub Campus Burewala Vehari, Faisalabad 38000, Punjab, Pakistan

2.COMSATS Univ Islamabad CUI, Dept Biosci, Pk Rd, Islamabad 45550, Pakistan

3.Yunnan Acad Agr Sci, Inst Agr Environm & Resources, Kunming 650205, Yunnan, Peoples R China

4.Univ Agr Faisalabad, Ctr Agr Biotechnol & Biochem, Faisalabad 38000, Punjab, Pakistan

关键词： photosynthetic; chlorophyll; drought; wheat; yield; seedling

期刊名称：SUSTAINABILITY （ 影响因子：3.251； 五年影响因子：3.473 ）

ISSN： 2071-1050

年卷期： 2019 年 11 卷 9 期

页码：

收录情况： SCI

摘要： Diminishing water resources as a result of excessive use of water for irrigation and climate change posture a severe global threat to food security. Herein, an experiment was conducted to determine the selection criteria for drought-tolerant bread wheat genotypes at the seedling stage using morphological and photosynthetic pigmentation-related traits. A panel of 105 wheat landraces, historical Pakistani varieties, and advance breeding lines were evaluated under normal and drought stress using factorial completely randomized design. The root length, fresh weight, dry weight, cell membrane thermo-stability, and chlorophyll b were positively correlated among themselves under both normal and stress conditions. Hence, selection of any one of these traits enhances the performance of other traits. The shoot length was non-significant and negatively associated with all other studied characters except relative water content. The results suggested that selection for shoot length could not improve genetic gain for drought tolerance. Out of 10 principal components (PCs), the first three PCs were showed significant genetic variation under both conditions. The first three PCs showed 74.6% and 76% cumulative genetic variation under normal and drought conditions, respectively. Based on PCA, 10 drought-tolerant and five drought-susceptible genotypes were identified. Overall results suggested that selection for root length, fresh weight, dry weight, cell membrane thermo-stability, and chlorophyll b at the seedling stage would improve genetic gain for drought tolerance. The outperforming genotypes under drought stress conditions can be useful in future wheat breeding programs, and early selection for the traits recommended in this study will be effective for developing high-yielding and drought-tolerant wheat varieties.

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