Mitigation of Drought Stress by Piriformospora indica in Solanum melongena L. cultivars
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RESEARCH ARTICLE
Mitigation of Drought Stress by Piriformospora indica in Solanum melongena L. cultivars S. Swetha1 • T. Padmavathi2
Received: 26 July 2018 / Revised: 28 June 2019 / Accepted: 22 July 2019 Ó The National Academy of Sciences, India 2019
Abstract The present study was undertaken to investigate the amelioration of drought stress in Solanum melongena L. cultivars (Arka Shirish and F1 hybrid) upon Piriformospora indica application under greenhouse conditions. Two cycles of drought stress were induced to both cultivars of S. melongena L. Piriformospora indica-colonized roots performed better as compared to uninoculated plants. An increase in root length (1.5-fold), shoot length (% 1.5-fold) and biomass (two fold) was observed with Piriformospora indica treated plants over untreated plants under drought stress. The percent colonization was found to be % 75%, and the accumulation of proline was found to be the highest in the Piriformospora indica treated S. melongena L. plants. An increase in total chlorophyll, relative water content, guaiacol peroxidase activity and catalase activity was observed in P. indica-inoculated roots as compared to uninoculated roots. P. indica-colonized S. melongena L. plants were able to tolerate two cycles of drought stress. Keywords Piriformospora indica Solanum melongena L. Drought stress
Significance Statement Piriformospora indica-colonized Solanum melongena L. plants were able to tolerate two cycles of drought stress by improving water absorption and nutrient uptake, accumulation of high proline content and conferring protection against ROS. & S. Swetha [email protected]; [email protected] 1
Centre for Incubation, Innovation, Research and Consultancy, Jyothy Institute of Technology Tataguni, Off Kanakapura Road, Bangalore 560082, India
2
Department of Microbiology, School of Sciences, Jain University, 9th Main, Jayanagar 3rd Block, Bangalore, India
Antioxidant enzyme activity Proline Relative water content
Introduction Plants are frequently subjected to various abiotic stresses that adversely affect the growth, development and agronomic yield. Drought is one such stress which affects plant productivity worldwide and is expected to increase with climatic changes. Plants can respond to drought stress at morphological, metabolic and cellular levels with modifications that allow the plants to avoid the stress and/or to increase its tolerance. In addition to its intrinsic mechanism, one of the possibilities to increase plant water acquisition and/or drought tolerance is through the application of beneficial microorganisms as inoculants [1]. The rhizospheric region surrounding the plant roots harbors several microorganisms that help plants in combating against various abiotic stresses and also help in enhancing plant growth [2]. Soil microorganisms such as arbuscular mycorrhizal fungi and plant growth-promoting rhizobacteria play an effective role in improving crop productivity under drought conditions. Various reports are available on the
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