Plant cell walls as suppliers of potassium and sodium ions for induced resistance in pea (Pisum sativum L.) and cowpea (Vigna unguiculata L.)

Springer Science and Business Media LLC - Tập 79 - Trang 12-17 - 2012
Masashi Amano1,2, Kazuhiro Toyoda1, Akinori Kiba1,3, Yoshishige Inagaki1, Yuki Ichinose1, Tomonori Shiraishi1
1Laboratory of Plant Pathology and Genetic Engineering, Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
2Saitama Gensyu Ikuseikai Co. Ltd, Saitama, Japan
3Laboratory of Plant Pathology and Biotechnology, Faculty of Agriculture, Kochi University, Kochi, Japan

Tóm tắt

When an elicitor is applied to plants to induce resistance, one of the first detectable events is the efflux of ions from the treated tissue. Here we are the first to demonstrate that an elicitor from Mycosphaerella pinodes evokes leakage of Na+ and K+ ions from isolated cell walls of pea and cowpea in vitro, as observed for epicotyl tissues. Pharmacological experiments showed that this elicitor-stimulated leakage was sensitive to vanadate and N-(3-methylphenyl)biphenyl-4-sulfonamide (NGXT-191), that inhibit a cell wall-associated ATPase (apyrase). Vanadate or NGXT-191 suppressed elicitor-induced superoxide generation and expression of defense genes in vivo. On the basis of these results, we assume that the leakage of these ions, probably associated with an ATP-dependent process(es) in the cell wall, is likely associated with induced defenses of pea and cowpea.

Tài liệu tham khảo

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