Infection-inhibition activity of avenacin saponins against the fungal pathogens Blumeria graminis f. sp. hordei, Bipolaris oryzae, and Magnaporthe oryzae
- 357 Downloads
Triterpenoid saponins are sugar-modified triterpene derivatives. Cereals and other grasses are generally deficient in these secondary metabolites with the exception of oat. Oat accumulates antimicrobial triterpenoid saponins in its roots. These oat-root-derived compounds, called avenacins, confer broad-spectrum resistance to soil-borne pathogens. Here, we tested the effect of avenacins on the development of infection structures of fungal pathogens Blumeria graminis f. sp. hordei and Bipolaris oryzae and Magnaporthe oryzae. We show that avenacins are able to inhibit the infection process of these phytopathogens on plant hosts.
KeywordsAvenacin saponin Infection-inhibiting activity Blumeria graminis f. sp. hordei Bipolaris oryzae Magnaporthe oryzae
- Arneson PA, Durbin RD (1967) Hydrolysis of tomatine by Septoria lycopersici: a detoxification mechanism. Phytopathology 57:1358–1360Google Scholar
- Hostettmann KA, Marston A (1995) Saponins: chemistry and pharmacology of natural products. Cambridge University Press, CambridgeGoogle Scholar
- Mugford ST, Qi X, Bakht S, Hill L, Wegel E, Hughes RK, Papadopoulou K, Melton R, Philo M, Sainsbury F, Lomonossoff GP, Roy AD, Goss RJM, Osbourn A (2009) A serine carboxypeptidase-like acyltransferase is required for synthesis of antimicrobial compounds and disease resistance in oats. Plant Cell 21:2473–2484PubMedCrossRefGoogle Scholar
- Nasu K, Shiraishi T, Yoshioka H, Hori N, Ichinose Y, Yamada T, Oku H (1992) An endogenous suppressor of the defense response in Pisum sativum. Plant Cell Physiol 33:617–626Google Scholar