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Participation of green organs to grain filling in triticum turgidum var durum grown under mediterranean conditions

Merah, Othmane and Evon, Philippe and Monneveux, Philippe Participation of green organs to grain filling in triticum turgidum var durum grown under mediterranean conditions. (2018) International Journal of Molecular Sciences, 19 (1). 1-14. ISSN 1661-6596

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Official URL: https://dx.doi.org/10.3390/ijms19010056


In wheat, flag leaf, stem, chaff and awns contribute to grain filling through photosynthesis and/or re-mobilization. Environmental and genetic effects on the relative contribution of each organ were examined by analyzing the consequences of sink-source manipulations (shading and excision) and by comparing carbon isotope discrimination (D) values in dry matter (at maturity) and sap (two weeks after anthesis) in six durum wheat genotypes grown in two contrasting seasons. The contribution of flag leaf, stem, chaff and awns to grain filling, estimated by sink-source manipulations, highly varied with the season. The contribution of ear photosynthesis and re-mobilization from the stem increased with post-anthesis water stress. They showed a large genetic variation that was, however, not clearly associated to morphological characteristics of ear and stem. Isotopic imprints of chaff on grain D were identified as a possible surrogate of the destructive and cumbersome sink-source manipulations to evaluate the contribution of carbon assimilated in ears or re-mobilized from stem. This might facilitate screening of genetic resources and allow the combining of favourable drought tolerance mechanisms in wheat.

Item Type:Article
Additional Information:Thanks to MDPI editor. The definitive version is available at http://www.mdpi.com/1422-0067/19/1/56/htm. The original PDF of the article can be found at International Journal of Molecular Sciences website : http://www.mdpi.com
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Other partners > International Potato Center - CIP (PERU)
Laboratory name:
Deposited On:10 Jan 2018 16:22

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