Showing papers on "Isopimpinellin published in 1966"
TL;DR: The extractive of the leaves of plants that contain furocoumarins suppressed in vivo growth of G. limetticola and B. cinerea at concentrations lower than the contents of the extractive in the leaves.
Abstract: SUMMARY
A mixture of the furocoumarins pimpinellin, isopimpinellin, isobergapten and sphondin isolated from Heracleum sphondylium root was toxic to Gloeosporium limetticola, Botryis cinerea, Sclerotinia fructigena and Stereum purpureum at 200 p.p.m. or less in nutrient medium. The extractive of the leaves of plants that contain furocoumarins suppressed in vivo growth of G. limetticola and B. cinerea at concentrations lower than the contents of the extractive in the leaves. Furocoumarins may form an important class of natural defensive agents against fungi; this possibility is discussed.
26 citations
TL;DR: The structure of the toxic plant-growth-inhibitor occurring in Thamnosma montana Torr and Frem was shown to be 5-(3′-methyl-2′,3′)-8-methoxypsoralen (I), largely by spectroscopic means as discussed by the authors.
25 citations
TL;DR: The contents in the leaves and the toxicities in vitro of the active constituents suggest that they may contribute, to an important degree, to the defence of the leaf against G. limetticola.
Abstract: SUMMARY
Cuticular and cellular components of leaves of Citrus aurantifolia Swingle were tested for toxicity to Gloeosporium limetticola Clausen, responsible for the withertip disease. Cuticular waxes isolated from mature, resistant leaves showed little activity. A dimethoxy furocoumarin, isopimpinellin, isolated from the cellular components, was highly toxic, and ester and acidic fractions obtained from both young susceptible and mature resistant leaves showed some activity. The contents in the leaves and the toxicities in vitro of the active constituents suggest that they may contribute, to an important degree, to the defence of the leaf against G. limetticola.
18 citations
12 citations