Biologia plantarum 64: 110-118, 2020 | DOI: 10.32615/bp.2019.095

Di-n-butyl phthalate-induced phytotoxicity in Hordeum vulgare seedlings and subsequent antioxidant defense response

A. KUMARI, R. KAUR*
Department of Botanical and Environmental Sciences, Guru Nanak Dev University
Amritsar-143005, Punjab, India

Di-n-butyl phthalate (DBP) is one of the frequently detected phthalates in environmental samples. The effects of phthalates are extensively studied in the animals but the effects on plants are scarce. Therefore, the present study is aimed to envisage the effects of DBP on the antioxidative defense system in Hordeum vulgare L. seedlings grown under laboratory conditions for 7 d. The activities of different antioxidative enzymes were enhanced in the shoots. In the roots, the activity of guaiacol peroxidase increased and the catalase activity decreased initially but increased at higher DBP concentrations, whereas the activities of superoxide dismutase, ascorbate peroxidase, and glutathione reductase declined. Furthermore, the content of polyphenols elevated after exposure of seedlings to DBP. The possible reason for these responses of barley seedlings is the oxidative burst, i.e., enhanced production of reactive oxygen species, which were confirmed using confocal microscopy in terms of loss in plasma membrane integrity. DBP also disturbed the normal stomatal morphology of barley seedlings. The study may help to provide insights into the defense of crop plants against phthalate stress.

Keywords: barley, confocal microscopy, plasma membrane integrity, SEM, stomata

Received: December 6, 2018; Revised: April 7, 2019; Accepted: July 26, 2019; Published online: February 18, 2020Show citation

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KUMARI, A., & KAUR, R. (2020). Di-n-butyl phthalate-induced phytotoxicity in Hordeum vulgare seedlings and subsequent antioxidant defense response. Biologia plantarum, 64, 110-118. doi: 10.32615/bp.2019.095.
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