Elicitation of resistance and defense related proteins by î²-amino butyric acid in sunflower against downy mildew pathogen plasmopara halstedii

Nandeeshkumar, P. and Sarosh, B. R. and Kini, Ramachandra K. and Prakash, H. S. and Shekar, H. (2009) Elicitation of resistance and defense related proteins by î²-amino butyric acid in sunflower against downy mildew pathogen plasmopara halstedii. Archives of Phytopathology and Plant Protection, 42 (11). pp. 1020-1032. ISSN 1477-2906

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Official URL: https://doi.org/10.1080/03235400701544085

Abstract

Induction of resistance to downy mildew caused by Plasmopara halstedii in sunflower was studied after treatment with b-amino butyric acid (BABA). Treatment of sunflower seeds with 50 mM BABA resulted in decreased disease severity and offered 47 and 50% protection under greenhouse and field conditions, respectively. The induction of resistance to P. halstedii by BABA was accompanied by the accumulation of various host defense related enzymes in susceptible sunflower seedlings. Enhanced activation of catalase, phenylalanine ammonia-lyase (PAL), chitinase (Pr3), peroxidase (POX), and polyphenol oxidase (PPO) was evident at 6 h, 9 h, 12 h, 12 h and 12 h post-inoculation, respectively in sunflower seedlings raised from seeds treated with BABA. Northern hybridisation analysis revealed increased levels of transcripts for five known defense-response genes, viz chalcone synthase, Pr-1a, peroxidase, b-1,3-glucanase and chitinase in these seedlings. This enhanced and early activation of defense related responses in the susceptible cultivar after treatment with BABA was comparable to that in the resistant cultivar. The results indicate that BABA-induced resistance against P. halstedii in sunflower is mediated through enhanced expression of genes for defense related proteins.

Item Type: Article
Uncontrolled Keywords: &#x3b2 and -amino butyric acid and defense related proteins and transcript accumulation and induction of resistance
Subjects: B Life Science > Biotechnology
Divisions: Department of > Biotechnology
Depositing User: Shrirekha N
Date Deposited: 03 Sep 2019 10:38
Last Modified: 11 Dec 2019 09:59
URI: http://eprints.uni-mysore.ac.in/id/eprint/7494

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