Genotypic variation in tolerance to salinity of common beans cultivated in Western Cameroon as assessed at germination and during early seedling growth
| Autor: | Simon M. Ndo, Asafor Henry Chotangui, Eric Bertrand Kouam, Marie Solange Mandou, Christopher Mubeteneh Tankou |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
genotype Agriculture (General) Biology salinity tolerance 01 natural sciences seedling growth S1-972 leaf sodium accumulation Genotype cameroon common bean Agriculture 04 agricultural and veterinary sciences biology.organism_classification Salinity Horticulture Variation (linguistics) germination Germination Seedling 040103 agronomy & agriculture 0401 agriculture forestry and fisheries General Agricultural and Biological Sciences 010606 plant biology & botany |
| Zdroj: | Open Agriculture, Vol 2, Iss 1, Pp 600-610 (2017) |
| ISSN: | 2391-9531 |
| DOI: | 10.1515/opag-2017-0064 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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