Plant growth-promoting fungus penicillium oxalicum enhances plant growth and induces resistance in pearl millet against downy mildew disease

Murali, M. and Amruthesh, K. N. (2015) Plant growth-promoting fungus penicillium oxalicum enhances plant growth and induces resistance in pearl millet against downy mildew disease. JOURNAL OF PHYTOPATHOLOGY, 163 (9). pp. 743-754. ISSN 1439-0434

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Official URL: http://doi.org/10.1111/jph.12371

Abstract

Plant Growth-promoting Fungus (PGPF) Penicillium oxalicum was isolated from rhizosphere soil of pearl millet and was tested for its ability to promote growth and induce systemic resistance in pearl millet against downy mildew disease. The fungal isolate P.oxalicum UOM PGPF 16 was identified as P.oxalicum using ITS sequencing and morphological analysis and sequence was deposited at NCBI with accession number KF150220. Pearl millet susceptible seeds were treated with three different inducers (CS, CF and LCF) of PGPF P.oxalicum and all the inducers significantly reduced the downy mildew disease and enhanced plant growth. Among the inducers tested, CS treatment recorded highest seed germination of 91% and 1427 seedling vigour followed by LCF and CF treatments. The vegetative growth parameter and NPK uptake studies under greenhouse conditions revealed that the CS treatment of P.oxalicum remarkably enhanced the parameters tested when compared to control plants. A significant disease protection of 62% and 58% against downy mildew disease was observed in plants pretreated with CS of P.oxalicum under greenhouse and field conditions, respectively. The spatio-temporal studies revealed that inducers P.oxalicum required a minimum of 3days for developing maximum disease resistance which was maintained thereafter. The maximum Peroxidase (POX) activity (62.7U) was observed at 24h in seedlings treated with CS of PGPF P.oxalicum and the activity gradually reduced at later time points after pathogen inoculation. Chitinase (CHT) activity was significantly higher in inducer treated seedlings when compared to control seedlings inoculated with pathogen after 48h and remained constant at all time points.

Item Type: Article
Uncontrolled Keywords: chitinase; induced resistance; nutrient uptake; Penicillium oxalicum; pearl millet; plant growth-promoting fungi; peroxidase
Subjects: B Life Science > Botany
Divisions: Department of > Botany
Depositing User: Shrirekha N
Date Deposited: 31 May 2019 07:09
Last Modified: 31 May 2019 07:10
URI: http://eprints.uni-mysore.ac.in/id/eprint/744

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