Journal of Stress Physiology & Biochemistry, Vol. 9 No. 4 2013, pp. 73-84 ISSN 1997-0838
Original Text Copyright (cc) 2013 by    Gogile, Andargie, Muthuswamy



ORIGINAL ARTICLE
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The Response of Some Cowpea (Vigna unguiculata L. Walp.) Genotypes for Salt Stress during Germination and Seedling Stage

Ashebir Gogile, Mebeasilassie Andargie* and Manikanidan Muthuswamy

Biology Department, College of Natural and Computational Sciences (CNCS), Haramaya University, P.O. Box: 138, Dire Dawa, Ethiopia

*E-Mail:  mebhel@yahoo.com


Received May 29, 2013


Salinity is one of the most significant abiotic factors affecting growth and yield of cowpea in arid and semi-arid areas of the world. Nineteen  cowpea (Vigna unguiculata) genotypes were tested during germination and seedling stages of growth at  4 NaCl concentrations (0, 50, 100 and 200mM). The experimental design was completely randomized design (CRD) in factorial combination with three replications. Data analysis was carried out using SAS (version 9.1) statistical  software.  Germination  percentage  (GP),  seedling  shoot  and  root  traits  were evaluated. The analyzed data revealed highly significant (p<0.001) variation among cowpea genotypes, treatments and their interactions. It is found that salt stress significantly decreased root  length  and  shoot  length.  The  extent  of  decrease  varied  with  accessions  and  salt concentrations.  Most accessions  were  highly  susceptible  to  200  mM  NaCl  concentration. Genotypes 211557 and Asebot were better salt tolerant. The result showed the presence of broad intraspecific genetic variation in cowpea genotypes for salt tolerance.

Key words:   cowpea, genotypes, NaCl, salinity, seedling growth

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