Glutamate dehydrogenase ec in the 1st leaf of wheat triticum aestivum cultivar capitole 2. de novo synthesis on darkness stress and senescence

Lauriere, C.; Weisman, N.; Daussant, J.

Physiologia Plantarum 52(1): 151-155


ISSN/ISBN: 0031-9317
DOI: 10.1111/j.1399-3054.1981.tb06049.x
Accession: 005528636

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The activity of glutamate dehydrogenase and the amounts of 2 antigens, bearing the bulk of this activity, were determined in wheat leaves (T. aestivum L. cv. Capitole) at different ages. These results were compared to those obtained with leaves deprived of light (darkness-stressed) during 3 days, at different stages of leaf life. The glutamate dehydrogenase activity increased in the leaves during normal senescence of the whole plant. De novo synthesis of one of the glutamate dehydrogenase proteins was shown, which correlated with this increase in activity. The considerable differences between the effects of darkness-stress, according to the leaf age, may characterize 3 steps in the leaf life: a 1st step during which leaves were not affected by stress, a 2nd one for which the stress effect was partially reversible and a final one during which stress impact was irreversible.