Photosynthetica 2001, 39(2):177-181 | DOI: 10.1023/A:1013762605766

Effects of Irradiance-Sulphur Interactions on Enzymes of Carbon, Nitrogen, and Sulphur Metabolism in Maize Plants

S. Astolfi1, M.G. De Biasi1, C. Passera1
1 Dipartimento di Agrobiologia e Agrochimica, Università, Viberto, Italy

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.

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

Published: June 1, 2001Show citation

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Astolfi, S., Biasi, M.G., & Passera, C. (2001). Effects of Irradiance-Sulphur Interactions on Enzymes of Carbon, Nitrogen, and Sulphur Metabolism in Maize Plants. Photosynthetica, 39(2), 177-181. doi: 10.1023/A:1013762605766.
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