Photosynthetica 1997, 33(14):537-543 | DOI: 10.1023/A:1006809412319

Photosynthetic acclimation to elevated CO2 in wheat cultivars

Poonam Sharma-Natu1, F.A. Khan1, M.C. Ghildiyal1
1 Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi -, India

Wheat (T. aestivum) cvs. Kalyansona and Kundan grown under atmospheric (CA) and elevated CO2 concentrations (650±50 cm3 m-3 - CE) in open top chambers were examined for net photosynthetic rate (PN), stomatal limitation (l s) of P N, ribulose-1,5-bisphosphate carboxylase (RuBPC) activity, and saccharide content of the leaves. The P N values of both CA- and CE-grown plants compared at the same CO2 concentration showed a down regulation under CE at the post-anthesis stage. The negative acclimation of P N appeared to be due to both stomatal and mesophyll components, and the RuBPC activity got also adjusted. There was a decrease in activation state of RuBPC under CE. In connection with this, an increased accumulation of saccharides in wheat leaf under CE was observed. Kalyansona, owing to its larger sink potential in terms of the number of grains, showed a greater enhancement under CE in both post-ear emergence dry matter production and grain yield. Under CE, this cultivar also showed a lower down regulation of P N than Kundan.

Additional key words: dry matter production; ear number; grain mass and yield; leaf area; ribulose-1,5-bisphosphate carboxylase; saccharides; starch; stomatal limitation

Prepublished online: January 1, 1998; Published: December 1, 1997  Show citation

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Sharma-Natu, P., Khan, F.A., & Ghildiyal, M.C. (1997). Photosynthetic acclimation to elevated CO2 in wheat cultivars. Photosynthetica, 34(4), 537-543. doi: 10.1023/A:1006809412319
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