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Tolerance of Gentianella campestris in relation to damage intensity: an interplay between apical dominance and herbivory

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Abstract

Meristem allocation models suggest that the patterns of compensatory regrowth responses following grazing vary, depending on (i) the number of latent meristems that escape from being damaged, and (ii) the activation sensitivity of the meristems in relation to the degree of damage. We examined the shape of compensatory responses in two late-flowering populations (59°20′N and 65°45′N) of the field gentian. Plants of equal initial sizes were randomly assigned to four treatment groups with 0, 10, 50 and 75% removal of the main stalk. The plants were clipped before flowering, and their performance was studied at the end of the growing season. The northern population showed a linear decrease in shoot biomass and fecundity with increasing biomass removal, while the response in the southern population was quadratic with maximum performance at the damage level of 50% clipping. This nonlinear shape depended upon the activation sensitivity of dormant meristems in relation to their position along the main stem. The highest plant performance was achieved by inflicting intermediate damage which induced regrowth from basally located meristems. In contrast, the topmost branches took over the dominance role of the main stem after minor apical damage (10% clipping). Consequently, the breakage of apical dominance is a necessary precondition of vigorous regrowth in this species. However, compensation in the field gentian is unlikely to be a mere incidental by-product of apical dominance. The ability to regrow from basally located meristems that escape from being damaged by grazing may well be a sign of adaptation to moderate levels of shoot damage.

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Authors and Affiliations

  1. Department of Biology, University of Oulu, Oulu, Finland

    Ari-Pekka Huhta, Juha Tuomi, Pasi Rautio & Kari Laine

  2. Department of Conservation Biology, Section of Conservation Botany, Swedish University of Agricultural Sciences, Uppsala, Sweden

    Tommy Lennartsson

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  1. Ari-Pekka Huhta
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Huhta, AP., Lennartsson, T., Tuomi, J. et al. Tolerance of Gentianella campestris in relation to damage intensity: an interplay between apical dominance and herbivory. Evolutionary Ecology 14, 373–392 (2000). https://doi.org/10.1023/A:1011028722860

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