Spatial variability in carbon- and nitrogen-related traits in apple trees : the effects of the light environment and crop load

© The Author(s) 2020. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: journals.permissionsoup.com.

Bibliographische Detailangaben
Veröffentlicht in:Journal of experimental botany. - 1985. - 72(2021), 5 vom: 27. Feb., Seite 1933-1945
1. Verfasser: Ngao, Jérôme (VerfasserIn)
Weitere Verfasser: Martinez, Sébastien, Marquier, André, Bluy, Sylvie, Saint-Joanis, Brigitte, Costes, Evelyne, Pallas, Benoît
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2021
Zugriff auf das übergeordnete Werk:Journal of experimental botany
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Leaf photosynthesis light harvesting light microclimate non-structural carbon source–sink relationships spatial variability Carbon 7440-44-0 mehr... Nitrogen N762921K75
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520 |a © The Author(s) 2020. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: journals.permissionsoup.com. 
520 |a Photosynthetic carbon assimilation rates are highly dependent on environmental factors such as light availability and on metabolic limitations such as the demand for carbon by sink organs. The relative effects of light and sink demand on photosynthesis in perennial plants such as trees remain poorly characterized. The aim of the present study was therefore to characterize the relationships between light and fruit load on a range of leaf traits including photosynthesis, non-structural carbohydrate content, leaf structure, and nitrogen-related variables in fruiting ('ON') and non-fruiting ('OFF') 'Golden Delicious' apple trees. We show that crop status (at the tree scale) exerts a greater influence over leaf traits than the local light environment or the local fruit load. High rates of photosynthesis were observed in the ON trees. This was correlated with a high leaf nitrogen content. In contrast, little spatial variability in photosynthesis rates was observed in the OFF trees. The lack of variation in photosynthesis rates was associated with high leaf non-structural carbohydrate content at the tree level. Taken together, these results suggest that low carbon demand leads to feedback limitation on photosynthesis resulting in a low level of within-tree variability. These findings provide new insights into carbon and nitrogen allocations within trees, which are heavily dependent on carbon demand 
650 4 |a Journal Article 
650 4 |a Research Support, Non-U.S. Gov't 
650 4 |a Leaf photosynthesis 
650 4 |a light harvesting 
650 4 |a light microclimate 
650 4 |a non-structural carbon 
650 4 |a source–sink relationships 
650 4 |a spatial variability 
650 7 |a Carbon  |2 NLM 
650 7 |a 7440-44-0  |2 NLM 
650 7 |a Nitrogen  |2 NLM 
650 7 |a N762921K75  |2 NLM 
700 1 |a Martinez, Sébastien  |e verfasserin  |4 aut 
700 1 |a Marquier, André  |e verfasserin  |4 aut 
700 1 |a Bluy, Sylvie  |e verfasserin  |4 aut 
700 1 |a Saint-Joanis, Brigitte  |e verfasserin  |4 aut 
700 1 |a Costes, Evelyne  |e verfasserin  |4 aut 
700 1 |a Pallas, Benoît  |e verfasserin  |4 aut 
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