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University of Agricultural Sciences, Bengaluru (2016)

ISOLATION OF ENDOPHYTIC FUNGI FROM TEMPERATURE TOLERANT PLANTS AND EVALUATION OF THEIR ABILITY TO CONFER TEMPERATURE TOLERANCE

SANGAMESH MALLIKARJUN, BIRADAR

Titre : ISOLATION OF ENDOPHYTIC FUNGI FROM TEMPERATURE TOLERANT PLANTS AND EVALUATION OF THEIR ABILITY TO CONFER TEMPERATURE TOLERANCE

Auteur : SANGAMESH MALLIKARJUN, BIRADAR

Université de soutenance : University of Agricultural Sciences, Bengaluru

Grade : Master of Science 2016

Résumé
Among abiotic stresses, high temperature stress has become a subject of global concern, as it affects the growth and productivity of crop plants. The average temperature within the Indian sub-continent has risen by 0.57°C in the last 100 years and models project that it is likely to rise further to a maximum of 2.5°C by 2050. An emerging approach to mitigate the effect of high temperature is the use of endophytic fungi. Endophytes are “symptom less” microorganisms, associated within plants throughout their life cycle which has been shown to provide the latter, growth benefits, often referred to as “habitat-adapted symbiosis”. In this study, endophytes from plant adpated to extreme aridity, such as in Thar desert, were isolated and evaluated for their ability to tolerate high temperatures and impart such tolerance to plants not adapted to high temperature stress. Ten plant species from Thar desert and five from AFRI nursery, Rajasthan, were collected and processed for endophytic fungi isolation. In total, 507 isolates belonging to 82 Operational Taxonomic Units (OTU’s) were obtained. Aspergillus flavus predominated followed by Aspergillus niger, Cheatomia sp. and Curvularia sp. Nine OTU’s were found to be high temperature tolerant (retained their ability to grow even at 45°C). However, inoculation of these endophytes to model plant system such as rice, finger millet and green gram did not impart high temperature tolerance. The fungal resources developed in the study paves way to explore potential genes for high temperature tolerance that might be residing in the high temeprature tolerant endophytes.

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