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Water availability limits tolerance of apical damage in the Chilean tarweed Madia sativa

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dc.contributor.author Gonzáles, Wilfredo L.
dc.contributor.author Suárez, L.H.
dc.contributor.author Molina-Montenegro, M.A.
dc.contributor.author Gianoli, E.
dc.date.accessioned 2022-10-09T00:33:32Z
dc.date.available 2022-10-09T00:33:32Z
dc.date.issued 2008
dc.identifier.uri https://hdl.handle.net/20.500.12866/12262
dc.description.abstract Plant tolerance is the ability to reduce the negative impact of herbivory on plant fitness. Numerous studies have shown that plant tolerance is affected by nutrient availability, but the effect of soil moisture has received less attention. We evaluated tolerance of apical damage (clipping that mimicked insect damage) under two watering regimes (control watering and drought) in the tarweed Madia sativa (Asteraceae). We recorded number of heads with seeds and total number of heads as traits related to fitness. Net photosynthetic rate, water use efficiency, number of branches, shoot biomass, and the root:shoot biomass ratio were measured as traits potentially related to tolerance via compensatory responses to damage. In the drought treatment, damaged plants showed ≈43% reduction in reproductive fitness components in comparison with undamaged plants. In contrast, there was no significant difference in reproductive fitness between undamaged and damaged plants in the control watering treatment. Shoot biomass was not affected by apical damage. The number of branches increased after damage in both water treatments but this increase was limited by drought stress. Net photosynthetic rate increased in damaged plants only in the control watering treatment. Water use efficiency increased with drought stress and, in plants regularly watered, also increased after damage. Root:shoot ratio was higher in the low water treatment and damaged plants tended to reduce root:shoot ratio only in this water treatment. It is concluded that water availability limits tolerance to apical damage in M. sativa, and that putative compensatory mechanisms are differentially affected by water availability. en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartofseries Acta Oecologica
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Branching en_US
dc.subject Herbivory en_US
dc.subject Photosynthesis en_US
dc.subject Plant tolerance en_US
dc.subject Root-shoot ratio en_US
dc.title Water availability limits tolerance of apical damage in the Chilean tarweed Madia sativa en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.actao.2008.04.004
dc.relation.issn 1146-609X


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