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Phytoalexin production elicited by exogenously applied jasmonic acid in rice leaves ( Oryza sativa L.) is under the control of cytokinins and ascorbic acid
Author(s) -
Tamogami Shigeru,
Rakwal Randeep,
Kodama Osamu
Publication year - 1997
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(97)00743-6
Subject(s) - phytoalexin , jasmonic acid , kinetin , zeatin , oryza sativa , cytokinin , ascorbic acid , biochemistry , caffeic acid , scopoletin , chemistry , biology , botany , salicylic acid , food science , explant culture , auxin , antioxidant , resveratrol , medicine , alternative medicine , pathology , gene , in vitro
Jasmonic acid (JA) has been shown to be a signaling compound which elicits the production of secondary metabolites including phytoalexins in plants. It has been shown that the phytoalexin production is elicited by exogenously applied JA in rice leaves. We now show that this phytoalexin production by exogenously applied JA is significantly counteracted by cytokinins, kinetin and zeatin. Kinetin and zeatin also inhibit the induction of naringenin‐7‐ O ‐methyltransferase (a key enzyme in rice phytoalexin production) by JA. A natural free radical scavenger, ascorbic acid (AsA) shows both counteractive and enhancing effects on JA‐inducible phytoalexin production, depending on its concentration. This effect of AsA suggests that active oxygen species (AOS) may play important roles in phytoalexin production by JA in rice leaves.