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PLoS Biol. 2010 Aug 17;8(8). pii: e1000454. doi: 10.1371/journal.pbio.1000454.

Aging in a long-lived clonal tree.

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1
Department of Biological Sciences, University of Idaho, Moscow, Idaho, United States of America. dilara.ally@gmail.com

Abstract

From bacteria to multicellular animals, most organisms exhibit declines in survivorship or reproductive performance with increasing age ("senescence"). Evidence for senescence in clonal plants, however, is scant. During asexual growth, we expect that somatic mutations, which negatively impact sexual fitness, should accumulate and contribute to senescence, especially among long-lived clonal plants. We tested whether older clones of Populus tremuloides (trembling aspen) from natural stands in British Columbia exhibited significantly reduced reproductive performance. Coupling molecular-based estimates of clone age with male fertility data, we observed a significant decline in the average number of viable pollen grains per catkin per ramet with increasing clone age in trembling aspen. We found that mutations reduced relative male fertility in clonal aspen populations by about 5.8 x 10(-5) to 1.6 x 10(-3) per year, leading to an 8% reduction in the number of viable pollen grains, on average, among the clones studied. The probability that an aspen lineage ultimately goes extinct rises as its male sexual fitness declines, suggesting that even long-lived clonal organisms are vulnerable to senescence.

Comment in

PMID:
20808953
PMCID:
PMC2923084
DOI:
10.1371/journal.pbio.1000454
[Indexed for MEDLINE]
Free PMC Article
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