DOI: 10.46810/tdfd.1923855 ISSN: 2149-6366

Evaluating Effects of Plant Growth-Promoting Rhizobacteria on Yield and Yield Components of Bean (Phaseolus Vulgaris L.) under Water Deficit Stress Condition

Hasan Er, Yasemin Kuşlu, Recep Kotan
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The purpose of this study was to assess how various irrigation levels and dosages of plant growth-promoting rhizobacteria (PGPR) affected the yield, yield components, and certain morphological traits of bean (Phaseolus vulgaris L.) plants cultivated in the field. The growth seasons of 2021 and 2022 were used for the experiment. 40% (I40), 70% (I70), and 100% (I100) of Class A pan evaporation served as the basis for the irrigation levels. Starting at 10-day intervals following sowing, the PGPR treatments were applied at four frequencies: R0 (control), R1 (once), and R3 (three times). The parameters evaluated in the trial included pod yield, pod weight, plant height, pod length, number of leaves, stem diameter, fresh and dry root weight, 1000-seed weight and number of seeds per pod. Plant growth was significantly impacted by both PGPR treatments and irrigation levels, according to statistical analyses (p < 0.05). According to the results obtained; pod yield was 321–1159 g m⁻², pod weight was 8.87–14.66 g, pod length was 8.50–15.33 cm, plant height was 30.01–65.23 cm, stem diameter was 10.51–16.54 mm, number of leaves 12.78–43, fresh root weight 12.78–43.05 g, dry root weight 3.21–11.61 g, seed number per pod 2.01–6.66, and 1000-seed weight 196.14–536.96 g. The lowest values for many parameters were recorded in the control group (I40R0) where water stress was highest and no bacterial application was made. In contrast, the highest values were obtained in the group that received full irrigation and was treated with the highest dose of PGPR (I100R3). The findings indicate that PGPRs play an important role in supporting plant growth and reducing the negative effects of drought stress.

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