Endophytic Fungi Produce Gibberellins and Indoleacetic Acid and Promotes Host-Plant Growth during StressReportar como inadecuado

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School of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu 702-701, Korea


Department of Agriculture Extension, Government of Khyber Pakhtunkhwa, Bunir 19290, Pakistan


Department of Botany, Kohat University of Science and Technology, Kohat 26000, Pakistan


Department of Botany, Abdul Wali Khan University, Mardan 23300, Pakistan


Author to whom correspondence should be addressed.

Abstract We isolated and examined two endophytic fungi for their potential to secrete phytohormones viz. gibberellins GAs and indoleacetic acid IAA and mitigate abiotic stresses like salinity and drought. The endophytic fungi Phoma glomerata LWL2 and Penicillium sp. LWL3 significantly promoted the shoot and allied growth attributes of GAs-deficient dwarf mutant Waito-C and Dongjin-beyo rice. Analysis of the pure cultures of these endophytic fungi showed biologically active GAs GA1, GA3, GA4 and GA7 in various quantities. The cultures of P. glomerata and Penicillium sp. also contained IAA. The culture application and endophytic-association with host-cucumber plants significantly increased the plant biomass and related growth parameters under sodium chloride and polyethylene glycol induced salinity and drought stress as compared to control plants. The endophytic symbiosis resulted in significantly higher assimilation of essential nutrients like potassium, calcium and magnesium as compared to control plants during salinity stress. Endophytic-association reduced the sodium toxicity and promoted the host-benefit ratio in cucumber plants as compared to non-inoculated control plants. The symbiotic-association mitigated stress by compromising the activities of reduced glutathione, catalase, peroxidase and polyphenol oxidase. Under stress conditions, the endophyte-infection significantly modulated stress through down-regulated abscisic acid, altered jasmonic acid, and elevated salicylic acid contents as compared to control. In conclusion, the two endophytes significantly reprogrammed the growth of host plants during stress conditions.

Keywords: endophytic fungi; phytohormones; abiotic stress; mutualism endophytic fungi; phytohormones; abiotic stress; mutualism

Autor: Muhammad Waqas 1,2,†, Abdul Latif Khan 1,3,†, Muhammad Kamran 1, Muhammad Hamayun 4, Sang-Mo Kang 1, Yoon-Ha Kim 1 and In-Jung Lee 1,*

Fuente: http://mdpi.com/


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