Cadmium-induced ethylene production in bean plants [Phaseolus vulgaris]
1981
Rodecap, K.D. | Tingey, D.T. | Tibbs, J.H. (Incorporation Northrop Services, Corvallis, Oregon (USA))
The shoots and/or roots of bush bean plants were encapsulated at specific time intervals following cadmium chloride (CdCl2)-application and kept in the dark for 2 hours prior to determining ethylene production. Cadmium accumulated more in the roots than in the shoots and ethylene production was likewise higher in the roots. CdCl2 (10 mM)-induced stress enthylene production increased rapidly, peaked within 5 to 10 hours and declined to 0 hours levels within 24 hours after treatment. A subsequent application of 10 mM CdCl2 at 24 hours elicited a similar ethylene response, indicating that the plants retained functional ethylene metabolism. Consecutive, daily applications (12 days) of CdCl2 (0.1 or 0.5 mM) induced only small increases in ethylene production. In all studies, however, tissues accumulated large amounts of Cd. Significant increases in ethylene production after a single CdCl2 application were associated with Cd concentrations of equal or greater 6 myM g dry shoot tissue. The association between stress ethylene production and tissue Cd levels was lost as stress ethylene production declined and also in the consecutive application study. The decline in stress ethylene production was attributed to Cd-sequestering which removed the Cd stress.
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