Journal of Stress Physiology & Biochemistry, Vol. 19 No. 3 2023, pp. 94-101    ISSN 1997-0838
Original Text Copyright (cc) 2023 by Kholiya and Kumar

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Phytotoxicity of Chromium (VI) on Germination, Growth Attributes and Pigmentation in Cluster Bean

N. Kholiya and A. Kumar*
1 Stress Physiology Laboratory, Department of Botany, University of Rajasthan, Jaipur 302004, India.


Received March 6, 2023

An investigation was carried out to study the phytotoxic effect of chromium (VI) on seed germination, plant growth parameters and biosynthesis of pigments in cluster bean (Cyamopsis tetragonoloba). Four concentrations (1, 2, 4 and 8 g ml-1) of Cr (VI) as potassium dichromate were applied to cluster bean seeds in solution culture. The rate of seed germination was observed every hour. Growth parameters were measured at the early seedling stage. The concentrations of chlorophyll, carotenoid and anthocyanin in leaves were estimated. All the studied concentrations of Cr (VI) were found to be toxic to cluster bean. The speed of seed germination slowed down under Cr (VI) stress. The root-shoot length, root-shoot fresh weight and root-shoot dry weight decreased with increasing concentrations of Cr (VI). The most deleterious effect was observed at 8 g ml-1. Anthocyanin contents in cluster bean showed a significant (P < 0.05) correlation with applied Cr (VI) concentrations. Out of the various concentrations of Cr (VI) studied, 1 g ml-1 and 2 g ml-1 were moderately toxic while 4 g ml-1 and 8 g ml-1 were highly toxic to cluster bean.

Key words:  Anthocyanin, chlorophyll, growth, seed germination, chromium toxicity

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