Genetic diversity within and among two-spotted spider mite resistant and susceptible common bean genotypes

Yousefi, Zeinab; Tahmasebi, Zahra; Moghadam, Mohammad Javad Erfani; Arminian, Ali

doi:10.14720/aas.2017.109.3.04

Cited by 1 publication

(1 citation statement)

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“…Also, some molecular markers have been developed for genes related to herbivory resistance in common beans (Blair et al., 2010), which can be used in marker‐assisted selection to increase the introgression of resistance in the crop genome. In this regard, microsatellite markers separated common bean genotypes corresponding to the results obtained at the phenotypic levels in terms of susceptibility to TSSM (Yousefi et al., 2017). However, the interactions between common bean plants and TSSM in open field conditions are poorly documented.…”

Section: Introductionmentioning

confidence: 99%

A field study on common bean (Phaseolus vulgaris) response to Tetranychus urticae herbivory

et al. 2021

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The bean farms in Iran are increasingly suffering from two‐spotted spider mite (TSSM) herbivory, which is intensified with the gradual increase in temperature and decrease in relative humidity coinciding with the flowering time in the common bean. Limited genetic variability for resistance to TSSM is a major bottleneck in the development of resistant common beans. Hence, this study aimed to evaluate the response of a diverse panel of 104 common bean genotypes to TSSM infestation during reproductive stages. The experiment was conducted in the form of an augmented randomized complete block design under TSSM‐infested and non‐infested conditions. The less susceptible genotypes had more grain yield, number of pods, plant height and leaf chlorophyll content, but also, they showed less reduction in these traits under TSSM herbivory condition relative to the more susceptible genotypes. The spider mite laid more eggs on the leaves of more susceptible beans creating a negative density dependence condition, while there was a greater nutritional contribution per adult mite on the leaves of less susceptible common beans. Variance components estimation highlighted grain yield, number of pods, plant height and 1,000‐grain weight of the common bean with the higher genotypic variances compared to environmental variances. The findings provide a phenotypic screening procedure of common bean to determine the main plant traits contributing to genetic TSSM resistance under field conditions. This study concludes that pole‐type genotypes of common bean would tolerate the mite feeding more than bush‐type genotypes during reproductive stages.

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Section: Introductionmentioning

confidence: 99%