Is there a trade-off for C-resources allocation between growth and polyphenol accumulation in tomato under contrasted situations of carbon and nitrogen availabilities ? - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2012

Is there a trade-off for C-resources allocation between growth and polyphenol accumulation in tomato under contrasted situations of carbon and nitrogen availabilities ?

Résumé

Growth and defense are competing plant processes that rely on organic compound syntheses mainly from carbon skeletons and nitrogen assimilates. Therefore, carbon (C) and nitrogen (N) availability in plant organs is crucial to sustain the cost of their concomitant upraising. We attempted to study in tomato leaves how C and N availability affects growth, C and N status and concentrations of the main primary and C-based secondary (i.e. defensive) metabolites. We compared mature to developing leaves because they exhibit contrasted source-sink activities during ontogeny. Greenhouse tomato plants were grown hydroponically at two contrasting atmospheric CO2 concentrations (350 and 700 ppm) and at two contrasting levels of N availability (limiting and non-limiting for plant growth). Five weeks after sowing, we sampled the leaves and determined dry biomass and the concentrations of C, N, free carbohydrates, starch, chlorogenic acid, rutin, kaempferol-rutinoside and lignin. The concentrations of defense-related compounds were positively correlated with C/N ratio in both leaf classes. These compounds get concentrated under LN, suggesting that these plants invested extra C and N resources in the leaves for the production of defense-related secondary compounds. The starch concentration followed the same pattern in both leaf classes. C and N availability had no effect on free carbohydrates concentration in fully developed leaves. The concentration of lignin, a structural secondary metabolite, was not affected by C and N resource availability, whatever the leaf class. The results suggest that nutrient fertilization could be a tool to alter the trade-off between growth and defense for nutrient resource allocation. Since the concentration of defense-related compounds in young leaves exceeds that of mature leaves, it is expected that developing leaves, especially under low N, will be able to defend better against predators
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hal-01268443 , version 1 (03-06-2020)

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  • HAL Id : hal-01268443 , version 1
  • PRODINRA : 221346

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Mathilde Royer, Romain Larbat, Jacques Le Bot, Stephane Adamowicz, Christophe Robin. Is there a trade-off for C-resources allocation between growth and polyphenol accumulation in tomato under contrasted situations of carbon and nitrogen availabilities ?. 26th International Conference on Polyphenols, Jul 2012, Florence, Italy. ⟨hal-01268443⟩
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