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Phenotypic plasticity and longevity in plants and animals: cause and effect?
1Centre for Ecological Sciences, Indian Institute of Science, Bangalore 560 012, India. renee@ces.iisc.ernet.in
Journal of Biosciences
|November 19, 2009
Summary
Immobile organisms like plants and modular animals exhibit extreme longevity compared to unitary animals. This extended lifespan is linked to phenotypic plasticity, offering resilience against environmental changes.
Area of Science:
- Ecology
- Evolutionary Biology
- Plant Sciences
Background:
- Immobile organisms, including plants and modular animals, demonstrate significantly longer lifespans than unitary animals.
- Understanding the mechanisms behind this extreme longevity is crucial for ecological and evolutionary studies.
Purpose of the Study:
- To explore theories explaining the extreme longevity of immobile organisms, focusing on phenotypic plasticity.
- To discuss the roles of specific plant traits and density-dependent phenomena in senescence and longevity.
- To consider the impact of climate change on long-lived versus short-lived organisms.
Main Methods:
- Review and discussion of existing theories on longevity and phenotypic plasticity.
- Analysis of plant features contributing to longevity, such as stem cell immortality, vascular autonomy, and epicormic branching.
- Examination of monocarpy vs. polycarpy and density-dependent effects on senescence evolution.
Main Results:
- Phenotypic plasticity, exemplified by stem cell immortality and vascular autonomy in plants, is a key factor in extreme longevity.
- Density-dependent phenomena and reproductive strategies (monocarpy/polycarpy) influence the evolution of senescence and longevity.
- Climate change scenarios may favor organisms with higher levels of plasticity and longer lifespans.
Conclusions:
- Immobile organisms' longevity is strongly associated with phenotypic plasticity, enabling adaptation and survival.
- The evolution of senescence is intricately linked to ecological factors like density dependence and reproductive strategies.
- Future environmental changes may confer an advantage to long-lived, plastic organisms.
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