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Title:: Selection of Drought-tolerant Soybean and Evaluation of the Drought.tolerance Indices

Author(s):: WANG Wei; JIANG Wei; ZHANG Jin-long; MIAO Long; ZHAO Tuan-jie; GAI Jun-yi; LI Yan; Soybean Research Institute of Nanjing Agricultural University/National Center for Soybean Improvement/National Key Laboratory of Crop Genetics and Germplasm Enhancement/MOA Key Laboratory for Biology and Genetic Improvement of Soybean (General), Nanjing 210095, China

Keywords:: Soybean; Drought; Drought-tolerance indices

PACS:: -

DOI:: 10.11861/j.issn.1000-9841.2015.05.0808

Abstract:: Drought is one of the major factors that cause soybean yield loss.Selection of the drought-tolerant soybean varieties and establishment of a relatively stable evaluation method for drought-tolerance is important for soybean drought-tolerance breeding.In this research, the drought-tolerance of soybean germplasm and the drought-tolerance indices were evaluated in two sand-culturing experiments.Twelve soybean varieties were selected after screening 87 and rescreening 30 soybean varieties using the drought-tolerance score, and 10 drought-tolerance indices reflecting soybean leaf wilting, leaf water content, and biomass were evaluated.Compared with the normal water regime, the leaf relative water content (RWC) decreased while the relative electrical conductivity (REC) in soybean leaves increased, and the growth rate and biomass of most soybean varieties decreased while the root to shoot ratio (R/S) increased under drought stress.There was significant difference among soybean varieties using these indices (P＜0.05). Days-to-wilt (DTW) has a heritability of 93% and is a simple and relatively stable index. There was a significantly negative correlation of the wilting score and REC with DTW, respectively, and a significantly positive correlation of RWC and the relative root dry weight with DTW, respectively.Furthermore, these indices had a relative high heritability of 73% to 89%, which could be used as additional selection indices for soybean drought-tolerance.Three soybean varieties, including PI595843, KF-1, and Wuheqihuangdou showed strong drought tolerance in this research, which could be used in future soybean drought-tolerance breeding program.

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Selection of Drought-tolerant Soybean and Evaluation of the Drought.tolerance Indices(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

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