Murali, M. and Sudisha, J. and Amruthesh, K. N. and Ito, S. I. and Shetty, H. S. (2013) Rhizosphere fungus Penicillium chrysogenum promotes growth and induces defence-related genes and downy mildew disease resistance in pearl millet. Plant Biology, 15 (1). pp. 111-118.
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Abstract
Susceptible pearl millet seeds (cv 7042S) were treated with the plant growth promoting fungus Penicillium chrysogenum (PenC-JSB9) at 1 x 10(8) spores center dot ml(-1) to examine mRNA expression profiles of five defence responsive genes and test its ability to induce resistance to downy mildew caused by Sclerospora graminicola. PenC-JSB9 treatment at 1 x 10(8) CFU center dot ml(-1) for 6 h significantly enhanced seed germination (9.8 89%), root length (4.08% to 5.1 cm), shoot length (18.9% to 7.77 cm) and reduced disease incidence (28%) in comparison with untreated controls. In planta colonisation of PenC-JSB9 showed that all three root segments (06 cm) and soil dilutions incubated on PDA produced extensive mycelial growth, however colonisation frequency of PenC-JSB9 was significantly higher in soil than in root segments. Spatiotemporal studies revealed that induction of resistance was triggered as early as 24 h and a minimum 23 days was optimal for total resistance to build up between inducer treatment and challenge inoculation in both experiments. In Northern blot analysis, transcript accumulation of resistant and PenC-JSB9 induced susceptible cultivars showed higher basal levels of defence gene expression than non-pretreated susceptible controls. Transcript accumulation in resistant seedlings challenge-inoculated with the pathogen showed maximum expression of CHS (3.5-fold increase) and Pr-1a (threefold increase) at 24 and 12 h, respectively. While PenC-JSB9 pretreated susceptible seedlings challenge-inoculated showed rapid and enhanced expression of LOX and POX at 48 h and for CHT at 24 h, whereas non-pretreated susceptible seedlings after pathogen inoculation showed weak expression of hybridised defence genes. Enhanced activation of defence genes by PenC-JSB9 suggests its role in elevated resistance against S. graminicola.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Induction of resistance; Penicillium chrysogenum; Sclerospora graminicola |
| Subjects: | B Life Science > Biotechnology B Life Science > Botany |
| Divisions: | Department of > Biotechnology Department of > Botany |
| Depositing User: | Arshiya Kousar Library Assistant |
| Date Deposited: | 12 Dec 2019 06:07 |
| Last Modified: | 12 Dec 2019 06:07 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/10185 |
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