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Carbon sink strength of nodules but not other organs modulates photosynthesis of faba bean (Vicia faba) grown under elevated CO₂ and different water supply
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Carbon sink strength of nodules but not other organs modulates photosynthesis of faba bean (Vicia faba) grown under elevated CO₂ and different water supply
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Carbon sink strength of nodules but not other organs modulates photosynthesis of faba bean (Vicia faba) grown under elevated CO₂ and different water supply
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Journal Article
Carbon sink strength of nodules but not other organs modulates photosynthesis of faba bean (Vicia faba) grown under elevated CO₂ and different water supply
2020
Overview
• Photosynthetic stimulation by elevated [CO₂] (e[CO₂]) may be limited by the capacity of sink organs to use photosynthates. In many legumes, N₂-fixing symbionts in root nodules provide an additional sink, so that legumes may be better able to profit from e[CO₂]. However, drought not only constrains photosynthesis but also the size and activity of sinks, and little is known about the interaction of e[CO₂] and drought on carbon sink strength of nodules and other organs.
• To compare carbon sink strength, faba bean was grown under ambient (400 ppm) or elevated (700 ppm) atmospheric [CO₂] and subjected to well-watered or drought treatments, and then exposed to 13C pulse-labelling using custom-built chambers to track the fate of new photosynthates.
• Drought decreased 13C uptake and nodule sink strength, and this effect was even greater under e[CO₂], and was associated with an accumulation of amino acids in nodules. This resulted in decreased N₂ fixation, and increased accumulation of new photosynthates (13C/sugars) in leaves, which in turn can feed back on photosynthesis.
• Our study suggests that nodule C sink activity is key to avoid sink limitation in legumes under e[CO₂], and legumes may only be able to achieve greater C gain if nodule activity is maintained.
