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Nitrogen nutrition and aspects of root growth and function of two wheat cultivars under elevated [CO<sub>2</sub>]

Nitrogen nutrition and aspects of root growth and function of two wheat cultivars under elevated [CO2]

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TAUSZ, Michael, Silvija BILELA, Helale BAHRAMI, Roger ARMSTRONG, Glenn FITZGERALD, Garry O’LEARY, Judy SIMON, Sabine TAUSZ-POSCH, Heinz RENNENBERG, 2017. Nitrogen nutrition and aspects of root growth and function of two wheat cultivars under elevated [CO2]. In: Environmental and Experimental Botany. 140, pp. 1-7. ISSN 0098-8472. eISSN 1873-7307. Available under: doi: 10.1016/j.envexpbot.2017.05.010

@article{Tausz2017-08Nitro-40495, title={Nitrogen nutrition and aspects of root growth and function of two wheat cultivars under elevated [CO2]}, year={2017}, doi={10.1016/j.envexpbot.2017.05.010}, volume={140}, issn={0098-8472}, journal={Environmental and Experimental Botany}, pages={1--7}, author={Tausz, Michael and Bilela, Silvija and Bahrami, Helale and Armstrong, Roger and Fitzgerald, Glenn and O’Leary, Garry and Simon, Judy and Tausz-Posch, Sabine and Rennenberg, Heinz} }

Tausz, Michael Tausz, Michael Simon, Judy Bahrami, Helale Fitzgerald, Glenn Bilela, Silvija Simon, Judy Bilela, Silvija Rennenberg, Heinz 2017-11-07T09:10:04Z O’Leary, Garry Tausz-Posch, Sabine Nitrogen (N) input into food production is environmentally sensitive and economically significant, making efficient N use an important goal in agricultural practice and in plant breeding. In cereals, grain N concentration [N] is an important component of grain quality and nutritional value. Increasing atmospheric CO<sub>2</sub> concentration [CO<sub>2</sub>] will not only stimulate growth and yield but also diminish grain [N], raising concerns about product quality and nutritional value.<br />In this study we investigated how differences in root structure and function and agronomic properties between two bread wheat (Triticum aestivum L.) cultivars affect N uptake and allocation to grains in a low rainfall environment, and whether such differences can indicate strategies to mitigate grain [N] decreases under increased [CO<sub>2</sub>]. Two cultivars (‘Silverstar’ and ‘Yitpi’) were chosen for their similar phenology and yields, but ‘Silverstar’ often has lower grain [N]. A glasshouse experiment showed contrasting root structure and function strategies between the two cultivars in response to soil N: ‘Yitpi’ but not ‘Silverstar’ responded to lower soil N with increased root growth, whereas ‘Silverstar’ but not ‘Yitpi’ showed increased N uptake per unit root mass in response to lower N.<br />When grown in the Australian Grains Free Air CO<sub>2</sub> Enrichment facility over multiple seasons both cultivars produced similar yields, but ‘Silverstar’ had consistently lower grain [N], smaller grains and greater harvest index. In situ N uptake measurements with <sup>15</sup>N label showed that wheat roots can take up nitrate, ammonium and glutamine, and also confirmed differences in uptake strategies between cultivars: ‘Silverstar’ roots had significantly greater uptake capacity than ‘Yitpi’ roots for ammonium. Whilst these results suggest that different strategies in response to variations in soil N supply could be related to grain N outcomes at this field site, there was no interaction with atmospheric [CO<sub>2</sub>] for any of the measured parameters. Regardless of cultivar, elevated [CO<sub>2</sub>] (550 μmol mol<sup>−1</sup>) increased yields and decreased grain [N], but did not affect root uptake capacities for either N form. Contrasting root uptake strategies seem unrelated to grain [N] decrease under elevated [CO<sub>2</sub>], at least for this site. 2017-08 Bahrami, Helale eng Rennenberg, Heinz O’Leary, Garry Fitzgerald, Glenn Armstrong, Roger Nitrogen nutrition and aspects of root growth and function of two wheat cultivars under elevated [CO<sub>2</sub>] Armstrong, Roger 2017-11-07T09:10:04Z Tausz-Posch, Sabine

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