אסיף מאגר המחקר החקלאי

Involvement of ethylene in epinasty of CMV-infected cucumber cotyledons which exhibit increased resistance to gaseous diffusion

Year:

1976

Source of publication :

Authors :

Volume :

9

Co-Authors:

Levy, D., Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
Marco, S., Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel

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Abstract:

Infection of cucumber seedlings by cucumber mosaic virus (CMV) caused a marked epinasty of the cotyledons persisting for at least 48 h, and followed by a partial recovery. Significantly enhanced levels of endogenous ethylene were detected in CMV-infected cotyledons about 24 h before epinasty occurred. Healthy cotyledons exhibited epinasty following exposure to exogenous ethylene. Exposure of infected seedlings to hypobaric ventilation, conditions which facilitated endogenous ethylene removal, prevented epinasty. Thus, CMV-induced epinasty in cucumber cotyledons seems to be related to enhanced ethylene production. Increased leaf resistance to gaseous diffusion was found in CMV-infected cotyledons as compared with healthy ones. This seems to be the reason for the lower levels of ethylene detected in the ambient atmosphere of diseased cotyledons and these possible changes have to be taken into consideration when ethylene emanation from diseased plants is examined. © 1976.

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