Intraspecific variation in leaf growth of wheat (Triticum aestivum) under Australian Grain Free Air CO2 Enrichment (AGFACE): Is it regulated through carbon and/or nitrogen supply?
Article
Article Title | Intraspecific variation in leaf growth of wheat (Triticum aestivum) under Australian Grain Free Air CO2 Enrichment (AGFACE): Is it regulated through carbon and/or nitrogen supply? |
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ERA Journal ID | 2590 |
Article Category | Article |
Authors | Thilakarathne, Chamindathee L. (Author), Tausz-Posch, Sabine (Author), Cane, Karen (Author), Norton, Robert M. (Author), Fitzgerald, Glenn J. (Author), Tausz, Michael (Author) and Seneweera, Saman (Author) |
Journal Title | Functional Plant Biology: an international journal of plant function |
Journal Citation | 42 (3), pp. 299-308 |
Number of Pages | 10 |
Year | 2015 |
Place of Publication | Melbourne, Vic. |
ISSN | 1445-4408 |
1445-4416 | |
Digital Object Identifier (DOI) | https://doi.org/10.1071/FP14125 |
Web Address (URL) | http://www.publish.csiro.au/paper/FP14125.htm |
Abstract | Underlying physiological mechanisms of intraspecific variation in growth response to elevated CO2 concentration [CO2] were investigated using two spring wheat (Triticum aestivum L.) cultivars: Yitpi and H45. Leaf blade elongation rate (LER), leaf carbon (C), nitrogen (N) in the expanding leaf blade (ELB, sink) and photosynthesis (A) and C and N status in the last fully expanded leaf blade (LFELB, source) were measured. Plants were grown at ambient [CO2] (∼384molmol-1) and elevated [CO2] (∼550molmol-1) in the Australian Grains Free Air CO2 Enrichment facility. Elevated [CO2] increased leaf area and total dry mass production, respectively, by 42 and 53% for Yitpi compared with 2 and 13% for H45. Elevated [CO2] also stimulated the LER by 36% for Yitpi compared with 5% for H45. Yitpi showed a 99% increase in A at elevated [CO2] but no A stimulation was found for H45. There was a strong correlation (r2≤0.807) between LER of the ELB and soluble carbohydrate concentration in LFELB. In ELB, the highest spatial N concentration was observed in the cell division zone, where N concentrations were 67.3 and 60.6mg g-1 for Yitpi compared with 51.1 and 39.2mg g-1 for H45 at ambient and elevated [CO2]. In contrast, C concentration increased only in the cell division and cell expansion zone of the ELB of Yitpi. These findings suggest that C supply from the source (LFELB) is cultivar dependent and well correlated with LER, leaf area expansion and whole-plant growth response to elevated [CO2]. |
Keywords | diurnal regulation of LER; elevated [CO2]; gas exchange; growth analysis; leaf blade elongation rate |
ANZSRC Field of Research 2020 | 310806. Plant physiology |
300406. Crop and pasture improvement (incl. selection and breeding) | |
300403. Agronomy | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Melbourne |
Department of Primary Industries, Victoria | |
International Plant Nutrition Institute, Australia | |
Department of Environment and Primary Industries, Victoria | |
Centre for Crop Health | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q2x9v/intraspecific-variation-in-leaf-growth-of-wheat-triticum-aestivum-under-australian-grain-free-air-co2-enrichment-agface-is-it-regulated-through-carbon-and-or-nitrogen-supply
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