title: Genetic analysis of salt stress responses in asparagus bean (Vigna unguiculata (L.) ssp. sesquipedalis Verdc.).
abstract: Salt stress responses of 23 asparagus bean cultivars were evaluated using 14-day-old seedlings after 15-day exposure to 75 mM NaCl in a hydroponics culture system. Salt-induced changes in plant growth and morphology, photosynthetic capacity, cell membrane integrity, and cellular protection enzyme systems as well as other physiological and biochemical traits were investigated to identify genotypic variability in salt response. This study also analyzed heredity parameters and correlation of the salt response index (SRI). Salt stress suppressed seedling growth and simultaneously reduced leaf area, content of chlorophyll and soluble proteins, net assimilation rate, as well as dry matter accumulation. In contrast, leaf blade cell membrane relative permeability, content of malondialdehyde, and antioxidant enzyme activity were elevated after salt treatment. Analysis of the heredity parameters has identified that the 18 investigated traits have different genotypic variance of the SRI values. Based on Ward's distances estimated for the sum of square variance in the SRI values, all the cultivars were classified into 2 discrete salt-tolerant and salt-sensitive clusters. Findings from this study will provide theoretical bases for identification and breeding of salt-tolerant cultivars in asparagus bean.
authors.affiliation: Key Laboratory of Ministry of Education for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan 430072, Hubei, China.
authors.forename: Chanyou
authors.initials: C
authors.lastname: Chen
authors.forename: Chengxue
authors.initials: C
authors.lastname: Tao
authors.forename: Hai
authors.initials: H
authors.lastname: Peng
authors.forename: Yi
authors.initials: Y
authors.lastname: Ding
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D001947:Breeding; D002463:Cell Membrane Permeability / Q000187:drug effects; D007887:Fabaceae / Q000187:drug effects / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D010641:Phenotype; D010788:Photosynthesis / Q000187:drug effects; D010940:Plant Proteins / Q000378:metabolism; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development; D012965:Sodium Chloride / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D010940:Plant Proteins; D012965:Sodium Chloride