Intraspecific variation in growth and yield response to elevated CO2 in wheat depends on the differences of leaf mass per unit area

Thilakarathne, Chamindathee L. and Tausz-Posch, Sabine and Cane, Karen and Norton, Robert M. and Tausz, Michael and Seneweera, Saman (2013) Intraspecific variation in growth and yield response to elevated CO2 in wheat depends on the differences of leaf mass per unit area. Functional Plant Biology, 40 (2). pp. 185-194. ISSN 1445-4408

Abstract

In order to investigate the underlying physiological mechanism of intraspecific variation in plant growth and yield response to elevated CO2 concentration [CO2], seven cultivars of spring wheat (Triticum aestivum L.) were grown at either ambient [CO2] (∼384molmol-1) or elevated [CO2] (700molmol-1) in temperature controlled glasshouses. Grain yield increased under elevated [CO2] by an average of 38% across all seven cultivars, and this was correlated with increases in both spike number (productive tillers) (r≤0.868) and aboveground biomass (r≤0.942). Across all the cultivars, flag leaf photosynthesis rate (A) increased by an average of 57% at elevated [CO2]. The response of A to elevated [CO2] ranged from 31% (in cv. H45) to 75% (in cv. Silverstar). Only H45 showed A acclimation to elevated [CO2], which was characterised by lower maximum Rubisco carboxylation efficiency, maximum electron transport rate and leaf N concentration. Leaf level traits responsible for plant growth, such as leaf mass per unit area (LMA), carbon (C), N content on an area basis ([N]LA) and the C:N increased at elevated [CO2]. LMA stimulation ranged from 0% to 85% and was clearly associated with increased [N]LA. Both of these traits were positively correlated with grain yield, suggesting that differences in LMA play an important role in determining the grain yield response to elevated [CO2]. Thus increased LMA can be used as a new trait to select cultivars for a future [CO2]-rich atmosphere.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 CSIRO. Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 01 Jul 2014 02:09
Last Modified: 23 Mar 2017 00:30
Uncontrolled Keywords: gas exchange; growth analysis; leaf nitrogen; photosynthetic acclimation; specific leaf mass; Triticum aestivum L.
Fields of Research : 06 Biological Sciences > 0607 Plant Biology > 060705 Plant Physiology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070305 Crop and Pasture Improvement (Selection and Breeding)
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070302 Agronomy
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820507 Wheat
Identification Number or DOI: 10.1071/FP12057
URI: http://eprints.usq.edu.au/id/eprint/25396

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