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Related Experiment Video

Updated: May 12, 2026

Quantifying Yeast Chronological Life Span by Outgrowth of Aged Cells

Quantifying Yeast Chronological Life Span by Outgrowth of Aged Cells

Published on: May 6, 2009

Aging in a long-lived clonal tree.

Dilara Ally¹, Kermit Ritland, Sarah P Otto

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

|September 3, 2010

Summary

This summary is machine-generated.

Senescence, or aging, is common in organisms. This study shows that older clonal trembling aspen (Populus tremuloides) plants have reduced reproductive performance due to accumulated mutations, demonstrating aging in long-lived plants.

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Area of Science:

Ecology
Evolutionary Biology
Genetics

Background:

Most organisms exhibit senescence, a decline in function with age.
Evidence for senescence in clonal plants is limited.
Somatic mutations accumulating during asexual growth may drive senescence in long-lived clonal plants.

Purpose of the Study:

To investigate age-related reproductive decline (senescence) in clonal trembling aspen (Populus tremuloides).
To determine if accumulated somatic mutations contribute to senescence in this species.

Main Methods:

Molecular methods were used to estimate the age of trembling aspen clones.
Male fertility data (viable pollen grains per catkin) were collected from clones of varying ages.
The relationship between clone age and reproductive performance was analyzed.

Main Results:

A significant decline in viable pollen grains per catkin was observed with increasing clone age.
Somatic mutations reduced male fertility by an estimated 5.8 x 10(-5) to 1.6 x 10(-3) per year.
This resulted in an average 8% reduction in viable pollen among older clones.

Conclusions:

Long-lived clonal plants like trembling aspen are vulnerable to senescence.
Accumulated somatic mutations contribute to reduced male fertility and potential extinction risk.
Senescence may be a more widespread phenomenon than previously thought, even in clonal organisms.