The induction of sensitivity to gibberellin in aleurone tissue of developing wheat grains : II. Evidence for temperature-dependent membrane transitions

Norman, H.A.; Black, M.; Chapman, J.M.

Planta 154(6): 578-586

1982


ISSN/ISBN: 0032-0935
PMID: 24276355
DOI: 10.2307/23375712
Accession: 001010456

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Abstract
Aleurone tissue from undried immature developing grains of wheat cv. Sappo, normally insensitive to GA, could be made to respond to the hormone by a series of temp. treatments. Incubation of the de-embryoed grains at temp. >27 deg C for at least 8 h caused the tissue to become sensitive. Prolonged incubation at temp. <27 deg did not effect a change in sensitivity. In addition to the requirement for exposure to an elevated temp. the tissue must also subsequently be subjected to a period at a lower temp. for just a few seconds for the response to be observed. Once sensitized, the tissue remained responsive to GA for substantial periods of time. Exposure of the tissue to temp. which induced sensitivity to GA also resulted in an increased leakage of amino acids. It is suggested that the increase in sensitivity to gibberellin requires 2 separate processes to take place. One could be a homeoviscous adaptation of the cell membranes in response to elevated temp., the other a subsequent permanent change in conformation of membrane components.