Pre-zygotic parental environment modulates seed longevity

Kochanek, Jitka, Buckley, Yvonne M., Probert, Robin J., Adkins, Steve W. and Steadman, Kathryn J. (2010) Pre-zygotic parental environment modulates seed longevity. Austral Ecology, 35 7: 837-848. doi:10.1111/j.1442-9993.2010.02118.x

Author Kochanek, Jitka
Buckley, Yvonne M.
Probert, Robin J.
Adkins, Steve W.
Steadman, Kathryn J.
Title Pre-zygotic parental environment modulates seed longevity
Journal name Austral Ecology   Check publisher's open access policy
ISSN 1442-9985
Publication date 2010-11-01
Year available 2010
Sub-type Article (original research)
DOI 10.1111/j.1442-9993.2010.02118.x
Volume 35
Issue 7
Start page 837
End page 848
Total pages 12
Place of publication Richmond, Vic., Australia
Publisher Wiley-Blackwell Publishing Asia
Language eng
Subject C1
960603 Environmental Lifecycle Assessment
060207 Population Ecology
Formatted abstract
The potential for the pre-zygotic plant growth environment to play a role in determining seed longevity was investigated for a species that inhabits arid to semi-arid Australia. Seed longevity is particularly important for wild populations in fluctuating environments because the longer a seed-lot is able to survive in the soil seed bank the more likely it is to buffer the population from unpredictable environments. Thus Wahlenbergia tumidifructa plants received wet or dry soil moisture within a warm or cool glasshouse until flowering. Seeds subsequently produced by flowers that opened on the day that plants were moved to a common environment were collected at maturity and longevity assessed by controlled ageing at 60% relative humidity and 45°C. Mean seed longevity was similar for seeds produced by plants that grew in warm-wet, warm-dry and cool-dry conditions (P50 of about 20 days), but extended for plants in cool-wet conditions (P50 = 41.7 days). Cool temperatures resulted in seeds with a wider distribution of lifespans (σ = 20 days) than warm conditions (σ = 12 days); the large σ caused the extended P50 for cool-wet plants, but not cool-dry as a result of a concomitant reduction in initial seed germination (Ki). After moving to the common environment, all plants generated new vegetative material, which went on to produce seeds with similar longevity (P50 approx. 20 days) irrespective of original environment. Visible phenotypic responses of the parent to environmental conditions correlated with longevity and quality parameters of the progeny seeds, suggesting that a parental effect modified seed longevity. Our study provides novel empirical data showing that environmental conditions expected under climate change scenarios may potentially cause seed longevity to decline for a species that inhabits arid to semi-arid Australia. These negative impacts on population buffering may weaken the storage effect mechanism of species coexistence in fluctuating environments.
© 2010 The Authors
Journal compilation © 2010 Ecological Society of Australia

Keyword Parental environment
Seed longevity
Storage effect
Wahlenbergia tumidifructa
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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Created: Tue, 14 Sep 2010, 22:04:40 EST by Joni Taylor on behalf of School of Biological Sciences