Show simple item record

Relative contribution of shoot and ear photosynthesis to grain filling in wheat under good agronomical conditions assessed by differential organ Delta13C

Creator: Sanchez-Bragado, R.
Creator: Molero, G.
Creator: Reynolds, M.P.
Creator: Araus, J.L.
Year: 2014
Language: English
Publisher: Oxford University Press
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Place of Publication: Oxford (United Kingdom)
Pages: 5401-5413
Issue: 18
Volume: 65
DOI: 10.1093/jxb/eru298
Keywords: Carbon Isotope Composition
Keywords: Flag Leaf
Keywords: Grain Filling
Description: During grain filling in C3 cereals, the shoot (particularly the flag leaf) and the ear are believed to play major roles as sources of assimilates. However, both the cost and the intrusive nature of most of the methodologies available to investigate this have prevented conclusive results being obtained. This study compared the carbon isotope composition (Delta13C) in its natural abundance in mature kernels with the Delta13C of the water-soluble fraction of the peduncle, glumes, and awns to assess the relative contribution of the shoot (understood as the whole set of photosynthetic organs below the peduncle) and ear to grain filling in a set of highly productive wheat lines from the International Maize and Wheat Improvement Center, Mexico, under good agronomic conditions. In overall terms, the contribution of the ear was greater in comparison with that of the shoot. The specific contribution of the flag leaf blade to grain filling was also assessed by comparing the Delta13C of grains with the Delta13C of the water-soluble fraction of the flag leaf and the awns. The contribution of the flag leaf was minor, ranging between 3 and 18%. Complementary analyses performed such as gas-exchange rates and the accumulated water-soluble carbohydrates in both organs and light intercepted by the canopy at different strata suggested that the ear has a photosynthetic capacity at least comparable to that of the flag leaf. In this sense, selection for a higher contribution of ear photosynthesis to grain yield in breeding programmes could be addressed with the use of stable isotopes.
Agrovoc: CARBON 13
Agrovoc: GRAIN
Agrovoc: EARS
Agrovoc: SHOOTS
ISSN: 0022-0957
Journal: Journal of Experimental Botany

Files in this item


This item appears in the following Collection(s)

  • Wheat
    Wheat - breeding, phytopathology, physiology, quality, biotech

Show simple item record