Title : Comparative morphological responses of Landrace Dwarf Common Bean (Phaseolus vulgaris L.) Genotypes Collected from Western Mediterranean Region of Turkey under salt stress
Abstract:
Common bean (Phaseolus vulgaris L.) is an important crop in terms of both nutrition and sustainable agriculture, which can be grown anywhere except Antarctica. The most effective method to increase the tolerance level of common bean, which is a sensitive crop to salt stress, is to determine tolerant genotypes and use them in breeding studies. Landrace cultivars, which are extremely important genetic resources, must be evaluated and examined for breeding studies. In this study, plant growth parameters of 16 landrace dwarf bean genotypes collected from Western Mediterranean region of Turkey at different salt concentrations were investigated. As the threshold value for beans was 1.5 ds/m, the salt concentrations were applied 0.5 (regular irrigation water), 2, 4 and 6 ds/m. The study continued until the first flowering was observed in the plants. In the plants harvested after the first flowering; plant height (cm), root length (cm), plant fresh and dry weight (g), leaf width and length (cm) and stem diameter (cm). In addition, plants were evaluated according to scale 1-5. The data obtained that Indicated a positively moderate statistically significant relationship between plant fresh weight and root length, plant dry weight and leaf length, leaf width and leaf length. Besides, the salt concentrations applied were not statistically significant on plant dry weight and stem diameter. However, plant height, plant fresh weight, leaf width and leaf length characteristics decreased with increasing salt concentrations. Genotypes gave different responses to salt stress and the ADY4 genotype gave the best results. Besides the ADY4 genotype, prominent genotypes were detected as BY24, ISGA1 and IYOZ10.
Using the plant development criteria examined in this study, researchers can perform pre-screening studies on stress tolerance studies. Since pre-screening allows for the separation of genotypes at the early stage of plant development, it will provide labour and financial savings for large-scale breeding programme.
