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Article Dans Une Revue Biological Invasions Année : 2024

Away-range shifts in leaf function of a global invader: a case of resource reallocation?

Résumé

Leaf resource allocation plays a significant role in the evolution of plant functional strategies, where tradeoffs between defense, structure, and different components of photosynthesis drive the partitioning of carbon and nitrogen. One hypothesized but underexplored mechanism of the success of many invasive species in competition with natives is reallocation of resources toward higher photosynthetic capacity, assuming they experience reduced pest consumption in their invaded (‘away’) range. We examined leaf function and chemistry in the context of carbon and nitrogen (N) budgets in home- (Japan) and away-range (France and USA) populations of the global invader, Japanese knotweed (Reynoutria japonica (Houtt.) var. japonica). In 38 field populations, we measured photosynthetic CO2 (A-Ci) response curves and quantified the proportion of leaf N allocated to separate photosynthetic processes, including carboxylation (Rubisco content), light harvesting, and the electron transport chain, plus the amount of N allocated to cell structure (cell wall protein) and defense (total alkaloids, cyanogenic glycosides). Consistent with our hypothesis, we found significantly higher leaf N allocation to photosynthesis in both away range populations, particularly Rubisco content, along with higher total leaf N in USA populations. However, neither maximum carboxylation capacity nor light-saturated photosynthetic rates were greater in the away ranges, nor did we find reduced allocation to leaf structure (cell wall protein). Further, USA populations had significantly greater concentrations of defensive cyanogenic glycosides, where some native-range herbivores have unintentionally been introduced. Our study suggests that away-range changes in invader leaf function may be more complex than a simple expectation based on photosynthetic capacity.
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Dates et versions

hal-04517177 , version 1 (22-03-2024)

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Robert Griffin-Nolan, Lamine Bensaddek, Guillaume Decocq, Kouki Hikosaka, Thomas Kichey, et al.. Away-range shifts in leaf function of a global invader: a case of resource reallocation?. Biological Invasions, 2024, ⟨10.1007/s10530-024-03262-0⟩. ⟨hal-04517177⟩
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