Effect of aging on flavonoid content and resistance of cotton leaves to verticillium wilt

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Abstract

Young (1 to 3 nodes from the apex) leaves of Acala 4–42 cotton plants resist infection by Verticillium dahliae, but become susceptible with increased age. This phenomenon is due to inhibition of fungal growth in young leaves. Resistant young leaves contain (+)-catechin, (+)-gallocatechin, isoquercitrin and condensed tannins in higher concentration than do older, susceptible leaves. Infection increases the concentrations of these compounds, especially in young leaves. (+)-Catechin prevents conidiation by V. dahliae at 5 × 10−5 m and strongly inhibits mycelial growth above 1 × 10−3 m. The concentration of (+)-catechin and (+)-gallocatechin found in resistant leaves is consistent with that required to strongly inhibit mycelial growth, whereas the concentrations found in older, susceptible leaves is much less inhibitory.

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