Photosynthetica 2002, 40(2):221-225 | DOI: 10.1023/A:1021393607410

Diurnal Changes in Photosynthesis, Sugars, and Nitrogen of Wheat and Mungbean Grown Under Elevated CO2 Concentration

A.C. Srivastava1, Y.P. Khanna1, R.C. Meena2, Madan Pal2, U.K. Sengupta2
1 Division of Biochemistry and Plant Physiology, SKUAST-J, RS Pura, Jammu, India
2 Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, India

The diurnal changes in leaf net photosynthetic rate (PN) and sugar and nitrogen contents in wheat [Triticum aestivum (L.) cv. HD 2285] and mungbean [Vigna radiata (L.) Wilczek cv. PS 16] were analysed under ambient, AC [350±25 µmol mol-1] and elevated, EC [600±50 µmol mol-1] CO2 concentrations. In both mungbean and wheat PN of AC- and EC-grown plants compared at the same CO2 concentration showed that PN was higher under EC. However, increased PN in EC-plants declined in the afternoon and approached PN of AC-plants. Depression in PN, however, was less in mungbean compared with the large depression in wheat. Greater down regulation of PN in wheat was associated with the accumulation of large amount of sugars and low nitrogen content in wheat leaves. Mungbean leaves accumulated mostly starch under EC and the difference in N content in AC- and EC-plants was relatively less than in wheat.

Additional key words: net photosynthetic rate; non-protein nitrogen; non-structural saccharides; protein nitrogen

Published: June 1, 2002  Show citation

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Srivastava, A.C., Khanna, Y.P., Meena, R.C., Pal, M., & Sengupta, U.K. (2002). Diurnal Changes in Photosynthesis, Sugars, and Nitrogen of Wheat and Mungbean Grown Under Elevated CO2 Concentration. Photosynthetica, 40(2), 221-225. doi: 10.1023/A:1021393607410
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