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Journal of Heredity Advance Access originally published online on October 22, 2007
Journal of Heredity 2007 98(7):655-665; doi:10.1093/jhered/esm084
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© The American Genetic Association. 2007. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Genetic Analysis of Salt Stress Responses in Asparagus Bean (Vigna unguiculata (L.) ssp. sesquipedalis Verdc.)

Chanyou Chen, Chengxue Tao, Hai Peng, and Yi Ding

From the Key Laboratory of Ministry of Education for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan 430072, Hubei, China (Chen and Ding); and the Laboratory of Germplasm and Genetics, College of Life Sciences, Jianghang University, Wuhan, 430056, Hubei, China (Chen, Tao, and Peng)

Address correspondence to Y. Ding at the address above, or e-mail: yiding{at}whu.edu.cn.

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.

Corresponding Editor: J. Perry Gustafson

Received October 9, 2006
Accepted March 17, 2007


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