Plant responses to high CO2 concentration in the atmosphere
1997
Saralabai, V.C. | Vivekanandan, M. | Suresh Babu, R. (Bharathidasan Univ., Trichirappalli (India). Dept. of Biotechnology)
The impact of continuous rise in ambient CO2 concentration (AC) in the atmosphere on different facets of growth of crop plants is assessed. The of CO2 enrichment (EC) on plant growth, C3 and C4 photosynthesis, source-sink ratio, partitioning and translocation of metabolites, photosynthetic enzymes, respiratory rate, leaf area index, stomatal conductance (gs), transpiration rate, biomass production and water use efficiency are reviewed. The CO2 fertilization effects are studied in both short-term (open top chambers) and long-term experiments. Long-term experiments suggest that ribulose-1,5-bisphosphate carboxylase is inactivated at high CO2 concentrations. Also gs is lowered. One of the conspicuous effect of EC is the closure of stomata in C3 plants. Photosystem (PS) 2 electron transport is more affected than PS1. Starch is the immediate product accumulated in the leaf of C3 plants. The "CO2 fertilization effect" does not confer any great advantage even in C3 plants.
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