Lechowicz1984a

Référence

Lechowicz, M.J. (1984) The Effects of Individual Variation in Physiological and Morphological Traits on the Reproductive Capacity of the Common Cocklebur, Xanthium strumarium L. Evolution, 38(4):833-844.

Résumé

The numbers of staminate inflorescences and seeds produced by individual cocklebur plants grown in an experimental garden were related to differences in the plants' emergence rates, height-growth, photosynthesis, transpiration, specific leaf areas, and patterns of biomass allocation to stem, leaf, and root tissues. Combinations of these morphological and physiological traits, rather than any of them taken singly, were necessary to make significant predictions of reproductive output. Plants that were more branched had significantly more staminate inflorescences. Seed production also increased with branchiness but not as strongly as flower production; instead traits important in the plant's carbon and water economy also were significant in predicting seed numbers. Seed production increased with decreases in either or both of two ratios: (1) the ratio of root biomass to transpiration rate, and (2) the ratio of photosynthetic rate to leaf biomass. The former ratio suggests that selection will favor minimizing the root biomass necessary to sustain a unit of transpiration. The latter ratio suggests that simply maximizing the photosynthetic rate will not maximize plant fitness; natural selection may favor making more leaves rather than fewer leaves with higher photosynthetic capacity. These results emphasize the importance of interactions between physiological and architectural traits in determining the reproductive capacity of this determinate-flowering and monoecious annual. In Xanthium, flower production appears to be largely determined by canopy architecture at the time of photoperiodic floral induction, but seed set is significantly influenced by the plant's carbon and water economy during the post-flowering period.

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@ARTICLE { Lechowicz1984a,
    AUTHOR = { Lechowicz, M.J. },
    TITLE = { The Effects of Individual Variation in Physiological and Morphological Traits on the Reproductive Capacity of the Common Cocklebur, Xanthium strumarium L. },
    JOURNAL = { Evolution },
    YEAR = { 1984 },
    VOLUME = { 38 },
    PAGES = { 833-844 },
    NUMBER = { 4 },
    ABSTRACT = { The numbers of staminate inflorescences and seeds produced by individual cocklebur plants grown in an experimental garden were related to differences in the plants' emergence rates, height-growth, photosynthesis, transpiration, specific leaf areas, and patterns of biomass allocation to stem, leaf, and root tissues. Combinations of these morphological and physiological traits, rather than any of them taken singly, were necessary to make significant predictions of reproductive output. Plants that were more branched had significantly more staminate inflorescences. Seed production also increased with branchiness but not as strongly as flower production; instead traits important in the plant's carbon and water economy also were significant in predicting seed numbers. Seed production increased with decreases in either or both of two ratios: (1) the ratio of root biomass to transpiration rate, and (2) the ratio of photosynthetic rate to leaf biomass. The former ratio suggests that selection will favor minimizing the root biomass necessary to sustain a unit of transpiration. The latter ratio suggests that simply maximizing the photosynthetic rate will not maximize plant fitness; natural selection may favor making more leaves rather than fewer leaves with higher photosynthetic capacity. These results emphasize the importance of interactions between physiological and architectural traits in determining the reproductive capacity of this determinate-flowering and monoecious annual. In Xanthium, flower production appears to be largely determined by canopy architecture at the time of photoperiodic floral induction, but seed set is significantly influenced by the plant's carbon and water economy during the post-flowering period. },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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