The compartmentation of ethylene in developing cotyledons of Phaseolus vulgaris L. |
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Authors: | P H Jerie A R Shaari M A Hall |
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Institution: | (1) Department of Botany and Microbiology, University College of Wales, SY23 3EB Aberystwyth, Dyfed, U.K.;(2) Present address: Irrigation Research Institute Tatura, Victoria, Australia;(3) Present address: Malaysian Agricultural Research and Development Institute, Serdang, Selangor, Malaysia |
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Abstract: | Isolated cotyledons of Phaseolus vulgaris L. cv. Canadian Wonder accumulated 14C2H4 (0.7–1 l l-1) from air to give partition coefficients of 1 to 4, which greatly exceeded the value obtained with steam killed cotyledons (0.05) and with water (0.11). After 14C2H4 treatment, 98% of the 14C in the tissue remained as 14C2H4. The labelled ethylene accumulated by cotyledons was released only slowly (1–10% h-1) either in an air stream or into toluene. Heating to 60°C for 2 h, but not freezing and thawing, caused the immediate release of 14C2H4 from the tissue. Propylene and vinyl chloride competitively inhibited the accumulation of 14C2H4.Cotyledons emanated endogenous ethylene at a very low rate but after heating (although not freezing and thawing) 13 nl of ethylene per g fresh mass were released within minutes. It was concluded that french bean cotyledons hold ethylene in a compartmented form in sufficient amount to account for at least 200 h of emanation.Abbreviation PPO
diphenyloxazole |
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Keywords: | Compartmentation Ethylene Phaseolus |
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