ISHS Acta Horticulturae 381: International Symposium on Natural Phenols in Plant Resistance
RESISTANCE OF TOMATO (LYCOPERSICON ESCULENTUM) TO DODDER (CUSCUTA REFLEXA) |
| Authors: | A. Sahm, F.-C. Czygan, P. Proksch |
| Abstract:
The present study focusses on the role of phenylpropanoid derivatives for the pronounced resistance of tomato (L. esculentum Mill.) towards the phanerogamic parasite C. reflexa Roxb. Microscopial analysis of the infection site (haustorial region) of tomato stems revealed formation of necrotic tissue surrounding the prehaustoria as well as suberinization of cell walls of living cells adjacent to the necrotic tissue. HPLC analysis of extracts from infection sites on tomato stems showed an enhanced accumulation of chlorogenic acid as well as a further unknown hydroxycinnamic acid derivative in the infected sites when compared to controls. In time course experiments chlorogenic acid reached maximal accumulation at the 4th day of infection whereas the highest content of the unknown compound was detected at the 6th day. The concentration of the flavonol glycoside rutin, however, remained largely unaffected by Cuscuta attack. Responses of L. esculentum similar to those observed following infection with Cuscuta could be provoked by wounding of stems resembling an attack by the parasite. | |
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