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Accumulation of Isohemigossypolone and Its Related Compounds in the Inner Bark and Heartwood of Diseased Pachira aquatica

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Title: Accumulation of Isohemigossypolone and Its Related Compounds in the Inner Bark and Heartwood of Diseased Pachira aquatica
Authors: SHIBATANI, Mariko Browse this author
HASHIDOKO, Yasuyuki Browse this author
TAHARA, Satoshi Browse this author
Keywords: Pachira aquatica
cadinane sesquiterpenes
Issue Date: 23-Oct-1999
Publisher: 社団法人日本農芸化学会
Journal Title: Bioscience, biotechnology, and biochemistry
Volume: 63
Issue: 10
Start Page: 1777
End Page: 1780
Abstract: Isohemigossypolone (1) and 2-O-methylisohemigossypolone (2), major fungitoxins of Pachira aquatica, were found to accumulate locally in the outer bark of the swollen trunk, whereas the inner bark and heartwood contained only a trace amount of them. From P. aquatica that was infected with a phytopathogenic bacterium, we detected significant amounts of 1 and 2 from browned inner tissues of the swollen trunk. According to a quantitative analysis by a gas-chromatograph, the concentration of 1 in the diseased inner tissues was calculated to be approximately 780μg/g f.w., which was the same level as that in the outer bark of healthy individuals. These findings suggest that the inner tissues inducibly produced and accumulated antifungals 1 and 2 during infection events, as do many plants with phytoalexins. 11-Nor-2-O-methylisohemigossypolone (3), showing approximately equivalent fungitoxic activity to that of 1 and 2,was also isolated from the infected inner tissues. We screened pathogenic bacteria from the infected tissue, and isolated a rod-shaped bacterium that was tentatively identified as Pseudomonas sp. which promoted tissuebrowning on sectioned disks of P. aquatica trunks.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 橋床 泰之

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