Abstract
A correlation has been established between production of specific phenylphenalenones and resistance of various banana and plantain varieties towards certain pathogens. In addition a dihydrotrihydroxyphenylphenalene was isolated from the resistant 'Pelipita' plantain variety in relatively high concentrations and its structure and relative configuration were assigned on the basis of 1D and 2D NMR and NOE information. This compound is considered a key intermediate in the biosynthesis of phenylphenalenone phytoalexins.
Highlights
Phytoalexins are antibiotic compounds produced by plants under the influence of chemical, physical or microbial stress factors [1]
A comprehensive analysis of phytoalexin production and biogenesis regulation could contribute to the design of plants possessing enhanced resistance against pests
We are interested in carrying out screening experiments to determine the occurrence of secondary metabolites, especially phytoalexins, in Musa varieties, and to establish correlations between phytoalexin production and susceptibility to pathogens, bacteria and fungi
Summary
Phytoalexins are antibiotic compounds produced by plants under the influence of chemical, physical or microbial stress factors [1]. We describe the correlation between the concentration of phenylphenalenones and the resistance against Mycosphaerella fidjiensis and Fusarium oxysporum fungi, both pathogens towards Musa plants. We report the structure and relative configuration of (1R*,2S*,3R*)-2,3-dihydro-1,2,3-trihydroxy-9-(4 ́methoxyphenyl)-1H-phenalene (1), which is a possible biosynthetic intermediate in phenylphenalenone biosynthesis in bananas.
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