Enhancement of extractable ethylene at light/dark transition in primary leaves of paclobutrazol‐treated Phaseolus vulgaris seedlings
1994
Tari, Irma | Nagy, Mária
Paclobutrazol [(2RS,3RS)‐1‐(4‐chlorophenyl)‐4,4‐dimethyl‐2‐(1,2,4‐triazol‐1‐yl)pentan‐3‐ol], a triazole growth retardant, increased the 1‐aminocyclopropane‐1‐carboxylic acid (ACC) level and resulted in reduced ethylene production, estimated as ethylene release in a closed system or by vacuum‐extraction, in the primary leaves of Phaseolus vulgaris L. cv. Juliska seedlings exposed to light. At the light/dark transition, a definite enhancement of the endogenous ethylene level was observed by vacuum‐extraction of primary leaves of treated plants and the ethylene deficiency of retardant‐treated leaves ceased. The concentration of ACC after the light/dark transition followed the pattern for ethylene, and the increase in ACC content was paralleled by a decrease in malonyl‐ACC. It is concluded that the internal level of ethylene is not necessarily lower in the primary leaves of paclobutrazol‐treated bean plants, but under special environmental conditions in vivo it may reach that of the control.
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