אסיף מאגר המחקר החקלאי

Suppression of botrytis blight in rose flowers with gibberellic acid. Possible formation of endogenous inhibitory compounds

Year:

1996

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Volume :

149

Co-Authors:

Zieslin, N., Hebrew University of Jerusalem, Kennedy Leigh Ctr. for Hort. Res., Faculty of Agriculture, PO. Box 12, Rehovot 76100, Israel
Shaul, O., Hebrew University of Jerusalem, Kennedy Leigh Ctr. for Hort. Res., Faculty of Agriculture, PO. Box 12, Rehovot 76100, Israel, Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel
Elad, Y., Dept. of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel

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Abstract:

Elongation of conidial germ tubes as well as linear growth of colonies of the fungal pathogen Botrytis cinerea were inhibited when growth media in vitro were supplemented with leachates from GA3-treated petals of rose (Rosa x hybrida cv. Mercedes) flowers. Content of phenolic substances extracted from petals 6 days after the GA3 treatment was higher than that in the control petals whereas no differences in content of phenols were found between the GA3-treated and the control petals examined 8 days after the GA3 treatment (9 days after harvest). Spore germination, germ tube elongation and mycelium growth were also inhibited when growth media in vitro were supplemented with phenolic extracts from petals treated with GA3 6 days prior to extraction but not when they were extracted 8 days after the GA3 treatment. Botrytis blight development in vivo was almost completely inhibited by phenolics extracted 6 days after GA3 treatment and was also practically inhibited by extracts from older petals. The content of sugars and amino acids in leachates from GA3-treated petals was lower than that in leachates from control petals. The inhibition of germ tube elongation in leachates from GA3-treated petals was eliminated when the growth media were supplemented with excessive amounts of glucose. The inhibition of Botrytis blight development in GA3-treated flowers in vivo was also eliminated when conidial suspensions were supplemented with glucose. The possible GA3- imposed formation of inhibitory compounds with a phenolic moiety is discussed.

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