Effect of polyethylene glycol-6000 on germination and early growth of Phaseolus vulgaris L. cv. 'Delicias'
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Abstract
Water stress affects numerous biological processes and crop yield. The present work aimed to evaluate the effect of polyethylene glycol (PEG)-induced water stress on germination and early growth of Phaseolus vulgaris cv. 'Delicias 364' seeds. Bean seeds were sown in Petri dishes with different PEG-6000 solutions (0-18 %) for eight days. The following indicators were evaluated: germination percentage, vigor, root length, hypocotyl and epicotyl, root/aerial part ratio, soluble carbohydrate, reducing sugars, protein and soluble phenol contents. A completely randomized design with four replications was used. The results were subjected to a simple analysis of variance and Duncan's test was performed for comparison between means. Polyethylene glycol reduced germination percentage, root length, hypocotyl, epicotyl and leaf structure formation. The content of reducing sugars in roots was higher than the control at 3, 6 and 9 % PEG. Similarly, the concentration of soluble proteins in roots was higher than the control at 3 and 6 % PEG, suggesting the presence of osmotic adjustment mechanisms in this variety. The root to aerial part ratio increased in the presence of PEG. The concentration of soluble polyphenols in the aerial part was similar between the control and treatments 3, 6 and 9 % PEG, which may contribute to reduce the oxidative damage generated under water stress conditions.
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