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Calcium potentiates post-invasive resistance to Golovinomyces orontii fungus in Arabidopsis

Author:
Lee, Gayoung, Kwon, Chian, Kim, Soohong, Kim, Mi Kyung, Lim, Jun, Heo, Jae Bok, Yun, Hye Sup
Source:
Genes & genomics 2015 v.37 no.6 pp. 545-550
ISSN:
1976-9571
Subject:
Arabidopsis, calcium, disease resistance, fungi, genes, immune response, pathogenesis, pathogens, powdery mildew, pretreatment, signal transduction
Abstract:
Ca²⁺ as in other cellular signaling pathways plays a key signal-mediating function in plant immune responses. However, a negative immune activity of some Ca²⁺-binding calmodulins implicates a rather confusing function of Ca²⁺ despite its importance in plant immunity. We therefore studied here an effect of Ca²⁺ on Arabidopsis disease resistance to an adapted Golovinomyces orontii powdery mildew fungus. Pre-treatment with Ca²⁺ enhanced plant defense against G. orontii especially during late pathogenesis. A similar inhibition of G. orontii growth by Ca²⁺ was also observed in the salicylic acid-depleted nahG plants. Golovinomyces orontii-dependent induction of defense genes by Ca²⁺ suggests that it acts as a defense-priming factor in plant post-invasive resistance to adapted powdery mildew fungal pathogens.
Agid:
1334425