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Genotypic variation in tolerance to salinity of common beans cultivated in Western Cameroon as assessed at germination and during early seedling growth

Eric B. Kouam
  • Department of Crop Sciences, Faculty of agronomy and Agricultural Sciences, University of Dschang, Cameroon, PO Box 222 Dschang, Cameroon
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/ Simon M. Ndo
  • Department of Crop Sciences, Faculty of agronomy and Agricultural Sciences, University of Dschang, Cameroon, PO Box 222 Dschang, Cameroon
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/ Marie S. Mandou
  • Department of Crop Sciences, Faculty of agronomy and Agricultural Sciences, University of Dschang, Cameroon, PO Box 222 Dschang, Cameroon
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/ Asafor H. Chotangui
  • Department of Crop Sciences, Faculty of agronomy and Agricultural Sciences, University of Dschang, Cameroon, PO Box 222 Dschang, Cameroon
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/ Christopher M. Tankou
  • Department of Crop Sciences, Faculty of agronomy and Agricultural Sciences, University of Dschang, Cameroon, PO Box 222 Dschang, Cameroon
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Published Online: 2017-12-29 | DOI: https://doi.org/10.1515/opag-2017-0064

Abstract

This study was carried out to determine effects of salinity on germination and seedling development of commercially important common bean genotypes in Cameroon. The seeds of eight genotypes were used for both trials. The germination experiments were carried out on petri dishes in the laboratory while early growth trials continued in plastic pots in the screenhouse. Both stages were setup using a randomized complete block design with three replications. Germination and early growth trials of the different genotypes were studied using distilled water as control or osmotic potentials of 50, 100, 150 and 200mM NaCl to study the effects of salinity on germination and seedling growth characteristics. Leaf concentrations of Na+ and K+ were determined. At the germination level, germination percentage, germination index and the coefficient of velocity of germination decreased with increasing salinity while the mean germination time and time to 50% germination increased with increasing level of salt. All the growth variables decreased with increasing salinity with the exception of the root length which was not affected by salinity. It was observed that increasing salinity induced a significant increase in leaf Na+ and substantial reduction in the accumulation of K+ in the leaves. For ions accumulation, germination variables and growth parameters, significant differences at 0.001 probability levels were found among salinity treatments, common bean genotypes and most of their interactions. Significant correlations were found between all germination variables and between most growth parameters. From the effect of salt application, the common bean genotypes namely KEBCB049, KEB-CB053 and Mac-33 were the most tolerant while KEB-CB055 and KEB-CB050 were the most sensitive. The results confirm that there is genotypic variation in salinity tolerance and that the most tolerant genotypes should be further explored in selection programs, with the aim that they should be promoted for cultivation in tropical zones affected by salinity.

Keywords : Common bean; Genotype; Germination; Seedling growth; leaf sodium accumulation; Salinity tolerance; Cameroon

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About the article

Received: 2017-08-29

Accepted: 2017-11-08

Published Online: 2017-12-29

Published in Print: 2017-12-20


Citation Information: Open Agriculture, Volume 2, Issue 1, Pages 600–610, ISSN (Online) 2391-9531, DOI: https://doi.org/10.1515/opag-2017-0064.

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