Effects of Irradiance-Sulphur Interactions on Enzymes of Carbon,Nitrogen, and Sulphur Metabolism in Maize Plants |
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Authors: | Astolfi S. De Biasi M.G. Passera C. |
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Affiliation: | (1) Dipartimento di Agrobiologia e Agrochimica, Università, via S. C. de Lellis, 01100 Viberto, Italy |
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Abstract: | The effect of sulphur deprivation and irradiance (180 and 750 µmol m–2 s–1) on plant growth and enzyme activities of carbon, nitrogen, and sulphur metabolism were studied in maize (Zea mays L. Pioneer cv. Latina) plants over a 15-d-period of growth. Increase in irradiance resulted in an enhancement of several enzyme activities and generally accelerated the development of S deficiency. ATP sulphurylase (ATPs; EC 2.7.7.4) and o-acetylserine sulphydrylase (OASs; EC 4.2.99.8) showed a particular and different pattern as both enzymes exhibited maximum activity after 10 d from the beginning of deprivation period. Hence in maize leaves the enzymes of C, N, and S metabolism were differently regulated during the leaf development by irradiance and sulphur starvation. |
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Keywords: | o-acetylserine sulphydrylase ATP sulphurylase chlorophyll dry mass glutamine synthetase NAD-dependent glutamate dehydrogenase nitrate reductase phosphoenolpyruvate carboxylase proteins ribulose-1,5-bisphosphate carboxylase |
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