Does a freely tillering wheat cultivar benefit more from elevated CO2 than a restricted tillering cultivar in a water-limited environment?
Article
Article Title | Does a freely tillering wheat cultivar benefit more from elevated CO2 than a restricted tillering cultivar in a water-limited environment? |
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ERA Journal ID | 5307 |
Article Category | Article |
Authors | Tausz-Posch, Sabine (Author), Dempsey, Raymond W. (Author), Seneweera, Saman (Author), Norton, Robert M. (Author), Fitzgerald, Glenn (Author) and Tausz, Michael (Author) |
Journal Title | European Journal of Agronomy |
Journal Citation | 64, pp. 21-28 |
Number of Pages | 8 |
Year | 2015 |
Publisher | Elsevier |
ISSN | 1161-0301 |
1873-7331 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.eja.2014.12.009 |
Web Address (URL) | http://www.sciencedirect.com/science/article/pii/S1161030114001567/pdfft?md5=8418c0484d3fcfde80b11372c6da7a4a&pid=1-s2.0-S1161030114001567-main.pdf |
Abstract | This study addresses whether a freely tillering wheat cultivar with greater vegetative sink strength (cv. 'Silverstar') can benefit more from increasing atmospheric CO2 concentration [CO2] than a restricted tillering cultivar with greater reproductive sink strength (cv. H45) in a water-limited cropping system. Growth, yield, yield components and nitrogen at three developmental stages (stem elongation, anthesis, maturity) and water soluble carbohydrates (WSC, anthesis) were evaluated at two CO2 concentrations (ambient [CO2], ~395ppm, elevated e[CO2], ~550ppm) across six environments using the Australian Grains Free Air CO2 Enrichment (AGFACE) facility. Cv. 'Silverstar' had more tillers than cv. 'H45' throughout development; whereas, cv. 'H45 had greater WSC storage and more and heavier kernels per spike. CO2 enrichment stimulated grain yield in both cultivars similarly, but this stimulation was caused differently: For cv. 'Silverstar', grain yield increase was exclusively linked to an increased number of fertile tillers; whereas, in cv. 'H45', yield stimulation was additionally associated with increased kernel weight and kernel numbers per spike. We conclude that in a Mediterranean-type, water-limited environment high tillering capacity alone does not ensure greater benefits from CO2 fertilization but that both pre and post-anthesis source-sink relationships play a significant role in this environment as well. |
Keywords | Triticum aestivum; free air carbon dioxide enrichment (FACE); growth; low rainfall; source-sink relations; Triticum aestivum L.; yield |
ANZSRC Field of Research 2020 | 310806. Plant physiology |
410404. Environmental management | |
410102. Ecological impacts of climate change and ecological adaptation | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Melbourne |
International Plant Nutrition Institute, Australia | |
Department of Environment and Primary Industries, Victoria | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q2w48/does-a-freely-tillering-wheat-cultivar-benefit-more-from-elevated-co2-than-a-restricted-tillering-cultivar-in-a-water-limited-environment
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