Determination of Salt Stress Tolerance Levels of Some Local Bean (Phaseolus vulgaris L.) Genotypes at Germination Stage

Authors: Enes Gökhan Yılmaz, Kezban Dinç, İskender Tiryaki

Abstract: This study was carried out to determine the tolerance levels of 18 local bean genotypes collected from various locations of Turkey at the germination stage. The germination test was conducted with 25 seeds with 4 replications by using a completely randomized block design. Seeds were placed on double filter paper in a covered plastic box and were incubated at 28 ± 0.5 °C in darkness. Control seeds of each genotype were treated with dH2O and were germinated under the same conditions as described before. The germination percentage, germination rate, and homogeneity of the seeds were calculated. The highest reduction rate in the final germination percentage was determined in the Pv-2 (36.84%) local genotype, while no deleterious effect of salt stress was observed in genotypes Pv-6, Pv-8, and Pv-14. Germination speed varied between G50 = 1.41 days (Pv-1) and G50 = 3.94 days (Pv-12) in salt stress conditions, while it was changed between 0.84 days (Pv-1) and 2.60 days (Pv- 18) under control conditions. The highest germination delay was determined in Pv-1 (G10-90 = 3.03 days), while the Pv-13 variety (G10-90 = 1.59 days) had the best germination homogeneity. The germination dynamics of seeds in time showed that the genetic variation existed in the early periods of germination in terms of genotype based performances in germination percentages decreased over time under controlled conditions while such genetic variation increasingly appeared in the later periods of time under salt stress conditions. The analysis to reveal the relationship between the seed size based on the two-dimensional surface area and salt stress tolerance levels of the seeds showed that there was no any linear relationship between the seed size and germination percentage of the genotype under salt stress conditions. However, it showed that there was a positive and negative relationship between rate (G50) and span (G10-90) of germination under both control and salt stress conditions, respectively. The results of the study revealed that the local bean genotypes showed significant variation for salt stress tolerance levels based on germination parameters determined and those genotypes which were determined as salt tolerant could be successfully used in such breeding programs.

Keywords: Salt stress, germination, germination dynamics, two-dimensional seed surface area, seed size

dergipark.org.tr/tr/download/article-file/3165623

Taken on: May 8, 2024

Tags:

saltstress

germination

twodimensionalseedsurfacearea

seedsize

Turkey

seed

beangenotype

science

internationaljournal

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