Article,
Intra-specific variation of wheat grain quality in response to elevated CO2 at two sowing times under rain-fed and irrigation treatments
JOURNAL OF CEREAL SCIENCE, (March 2014)
DOI: \%7B10.1016/j.jcs.2013.12.002\%7D
Abstract
In order to investigate the intra-specific variation of wheat grain quality response to elevated atmospheric CO2 concentration (eCO2), eight wheat (Triticum aestivum L.)cultivars were grown at two CO2 concentrations (CO2) (current atmospheric, 389 CO2 mu mol mol(-1) vs. eCO2, FACE (Free-Air CO2 Enrichment), 550 +/- 10\% CO2 mu mol mol(-1)), at two water levels (rain-fed vs. irrigated) and at two times of sowing (TOS1, vs. TOS2). The TOS treatment was mainly imposed to understand whether eCO2 could modify the effects of timing of higher grain filling temperatures on grain quality. When plants were grown at TOS1, TKW (thousand kernel weight), grain test weight, hardness index, P, Ca, Na and phytate were not significantly changed under eCO2. On the other hand, eCO2 increased TKW (16\%), hardness index (9\%), kernel diameter (6\%), test weight (2\%) but decreased grain protein (10\%) and grain phytate (11\%) at TOS2. In regard to grain Zn, Mn and Cu concentrations and some flour rheological properties, cultivar specific responses to eCO2 were observed at both sowing times. Observed genetic variability in response to eCO2 in terms of grain minerals and flour rheological properties could be easily incorporated into future wheat breeding programs to enable adaptation to climate change. (C) 2013 Elsevier Ltd. All rights reserved.
