Effects of elevated CO2 on plant growth and nutrient partitioning of rice (Oryza sativa L.) at rapid tillering and physiological maturity

Seneweera, Saman (2011) Effects of elevated CO2 on plant growth and nutrient partitioning of rice (Oryza sativa L.) at rapid tillering and physiological maturity. Journal of Plant Interactions, 6 (1). pp. 35-42. ISSN 1742-9145


This work investigates the relationship between plant growth, grain yield, nutrient acquisition and partitioning in rice (Oryza sativa L.) under elevated CO2. Plants were grown hydroponically in growth chambers with a 12-h photoperiod at either 370 or 700 mmol CO2 mol-1 concentration. Plant dry mass (DM), grain yield and macroand micronutrient concentrations of vegetative organs and grains were determined. Elevated CO2 increased biomass at tillering, and this was largely due to an increase in root mass by 160%. Elevated CO2 had no effect on total nutrient uptake (N, P, K, Mg and Ca). However, nutrient partitioning among organs was significantly altered. N partitioning to leaf blades was significantly decreased, whereas the N partitioning into the leaf sheaths and roots was increased. Nutrient use efficiency of N, P, K, and Mg in all organs was significantly increased at elevated CO2. At harvest maturity, grain yield was increased by 27% at elevated CO2 while grain (protein) concentration was decreased by a similar magnitude (28%), suggesting that critical nutrient requirements for rice might need to be reassessed with global climate change.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2011 Taylor & Francis. Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 01 Jul 2014 23:29
Last Modified: 09 Feb 2017 05:12
Uncontrolled Keywords: dry matter partitioning; elevated CO2; grain yield; nitrogen; nutrient partitioning; nutrient use efficiency; phosphorus; potassium; rice
Fields of Research : 06 Biological Sciences > 0607 Plant Biology > 060705 Plant Physiology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070303 Crop and Pasture Biochemistry and Physiology
06 Biological Sciences > 0607 Plant Biology > 060703 Plant Developmental and Reproductive Biology
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8204 Summer Grains and Oilseeds > 820402 Rice
Identification Number or DOI: 10.1080/17429145.2010.513483
URI: http://eprints.usq.edu.au/id/eprint/25407

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