Enzymatic response of Lemna gibba plants inoculated with endophyte bacteria
Plant Physiology Laboratory, Botany Department, School of National Biological Sciences, National Polytechnic Institute, México City 11340, México.
Research Article
Open Access Research Journal of Life Sciences, 2022, 04(01), 056–061.
Article DOI: 10.53022/oarjls.2022.4.1.0061
Publication history:
Received on 05July 2022; revised on 13 August 2022; accepted 15 August 2022
Abstract:
Duckweeds a kind of aquatic plants classified as macrophytes, have been considered as nutrient pumps. Studies of endophyte associates focused to their functional analysis contributing to the knowledge of plant microbe interactions. This work analyzed the effect on selected phenoloxidases as a response of Lemna gibba plants inoculated with endophyte bacteria associated to their activity of growth promotion. Five isolated endophyte bacteria belonging to Bacillus genera and named: Bacillus sp. strain Fb1, Bacillus sp. strain Fb2, Bacillus sp. strain Fb3, Bacillus sp. strain Fb4 and Bacillus sp. strain Fb5 were employed as inoculants. According to the fresh weight of Lemna gibba fronds, the results obtained showing a suitable promoting activity by the endophyte bacteria tested; even the growth of fronds based on protein content was less, it showed growth promotion between 30 to 60% of the effect compared to control plants. In this work, Lemna gibba plants inoculated with five endophyte bacteria, showed that these Bacillus strains not only acting as biostimulants they also induced the activity of both enzymes tested (guaiacol peroxidases and hemeperoxidases), recommending this plant species to evaluate the toxicity effect of contaminants and xenobiotics.
Keywords:
Plant growth-promoting endophyte bacteria; Phenoloxidases; Lemna gibba; Xenobiotics
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