Growth, Physiology and Biochemical Responses of Two Different Brassica Species to Elevated CO2

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Chakraborty, K., Uprety, D.C., Bhaduri, D. (2017)

Proceedings of the National Academy of Sciences, India Section B: Biological Sciences, 87(2), 389-397

In an open top chamber study, two contrasting Brassica cultivars from two different species were grown under two distinct levels of CO2 concentration, 550 umol mol-1 (elevated) and 390 umol mol-1 (ambient). CO2 enrichment showed significant increase in growth, leaf area and dry matter production in both the species. The continuous higher rate of photosynthesis (36.2 % in RH-30 and 27.3 % in Pusa Gold) under elevated CO2 condition attributed to the increased generation of foliage and enhancement in stem and root growth which is also evidenced by higher net assimilation and relative growth rate. The increase was highest at flowering stage with a concomitant increase in net photosynthetic rate but showed reduction in respiration rate and stomatal conductance. The increase in net photosynthesis further resulted in higher accumulation of sugars, non-structural carbohydrates and starch in leaves in elevated CO2 grown plants. Larger accumulation of biomass was observed in root as compared to other plant parts. However, the species specific differences were reflected in the accumulation of biomass, grain yield and gas exchange phenomena, wherein the greater response was invariably found in RH-30 (Brassica juncea) as compared to Pusa Gold (Brassica campestris). The present study may prove beneficial to understand crop responses to future climatic conditions and suggest efficient adaptive strategies from crop management perspectives.

Subject headings: Biomass; C-assimilation; Climate change; Crop stages; Mustard; Brassica; CO2; Carbon dioxide

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Type: Journal Article

Serial number: 2922