The induction of sensitivity to gibberellin in aleurone tissue of developing wheat triticum aestivum cultivar sappo grains 2. evidence for temperature dependent membrane transitions

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

Planta (Heidelberg) 154(6): 578-586


ISSN/ISBN: 0032-0935
Accession: 006694271

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Aleurone tissue from undried immature developing wheat grains (T. aestivum L. cv. Sappo), normally insensitive to GA3, can be made to respond to the hormone by a series of temperature treatments. Incubation of the de-embryoed grains at temperatures above C for at least 8 h causes the tissue to become sensitive. Prolonged incubation at temperatures below C does not effect a change in sensitivity. In addition to the requirement for exposure to an elevated temperature for a period of several hours, the tissue must also subsequently be subjected to a period at a lower temperature for just a few seconds for the response to occur. Once sensitized, the tissue remains responsive to GA3 for substantial periods of time. Exposure of the tissue to temperatures which induce sensitivity to GA3 also results in an increased leakage of amino acids. Evidently, the increase in sensitivity to GA requires 2 separate processes to take place. One could be a homeoviscous adaptation of the cell membranes in response to elevated temperature, the other a subsequent, permanent change in conformation of membrane components.