The Compartmentation of Ethylene in Developing Cotyledons of Phaseolus vulgaris L

Isolated cotyledons of Phaseolus vulgaris L. cv. Canadian Wonder accumulated 14C2H4 (0.7—1 μl 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 tis...

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Bibliographic Details
Published in:Planta 1979-01, Vol.144 (5), p.503-507
Main Authors: Jerie, P.H., Shaari, A.R., Hall, M.A.
Format: Article
Language:English
Subjects:
Chlorides
Cotyledons
Freezing
Perchlorates
Pericarp
Plants
Propylene
Radioactive decay
Radiocarbon
Tissue samples
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Summary:Isolated cotyledons of Phaseolus vulgaris L. cv. Canadian Wonder accumulated 14C2H4 (0.7—1 μl 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.
ISSN:0032-0935
1432-2048
DOI:10.1007/BF00380130