biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 46:35-39, 2003 | DOI: 10.1023/A:1022349814670

Responses of Rice Cultivars to the Elevated CO2

D.C. Uprety1, N. Dwivedi1, V. Jain1, R. Mohan1, D.C. Saxena1, M. Jolly2, G. Paswan1
1 Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi-, India
2 Division of Biochemistry, Indian Agricultural Research Institute, New Delhi-, India

The effect of CO2 concentration elevated to 575 - 620 µmol mol-1 on growth, tillering, grain yield, net photosynthetic rate, dark respiration rate, stomatal conductance, sugar content and protein profile of two rice (Oryza sativa L.) cultivars Pusa Basmati-1 and Pusa-677 at flowering stage was studied using open top chambers. The cultivar Pusa Basmati-1 responded more markedly for most of the growth and physiological parameters compared to Pusa-677. The increase in grain yield in Pusa Basmati-1 attributed largely to increased grain number. The increased net photosynthetic rate and greater accumulation of sugar contributed significantly to the accelerated development of leaves and tillers in both the cultivars. The reduction in the low molecular mass proteins including Rubisco and increase in high molecular mass photosystem 2 proteins was observed in both the cultivars. Additional sugars may possibly help in balancing the profile of photosynthetic proteins and sustain greater growth and productivity in rice cultivars.

Keywords: net photosynthetic rate; open top chambers; Oryza sativa; protein; respiration rate; stomatal conductance; sugars
Subjects: cultivar differences; gas exchange, elevated CO2 concentration; growth analysis, biomass production; open-top chamber, FACE; Oryza sativa; rice, elevated CO2 concentration; stomatal conductance, elevated CO2 concentration; sugars, elevated CO2 concentration

Prepublished online: March 1, 2003; Published: July 1, 2003  Show citation

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Uprety, D.C., Dwivedi, N., Jain, V., Mohan, R., Saxena, D.C., Jolly, M., & Paswan, G. (2003). Responses of Rice Cultivars to the Elevated CO2. Biologia plantarum, 46(1), 35-39. doi: 10.1023/A:1022349814670
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