Document Detail


Reductions in abscisic acid are linked with viviparous reproduction in mangroves.
MedLine Citation:
PMID:  21684959     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
We investigate physiological mechanisms behind the convergent evolutionary loss of seed dormancy in plant lineages, focusing on mangroves as a model system. More than 60 angiosperm families, including several mangrove taxa, contain species with seeds that are intolerant of drying and do not undergo dormancy. These desiccation-intolerant species occur with disproportionate frequency in wet or coastal tropical habitats. In plants, the hormone abscisic acid (ABA) coordinates both the development of desiccation tolerance during the onset of seed dormancy and whole-organism responses to flooding. Thus, changes in ABA levels and/or modes of action in different plant compartments are implicated in the repeated evolutionary loss of seed dormancy among species of wet habitats. We compare ontogenetic dynamics of ABA levels in embryonic, maternal, and mature vegetative tissue of four phylogenetically independent pairs of related viviparous mangroves and nonviviparous nonmangroves. We demonstrate that ABA levels are consistently lower in embryos of viviparous mangrove taxa than embryos of nonmangrove, nonviviparous sister taxa. In contrast, elevated tissue concentrations of ABA characterize leaves of all mangrove species tested, while ABA levels in maternal tissues vary among mangrove species. These commonalities suggest a functionally important trade-off between the maintenance of embryonic development and the adjustment of the parent tree to salinity stress. This study yields comparative data on seed physiology in naturally occurring desiccation-intolerant species, for which these data are currently scarce, and demonstrates a potentially significant role of phytohormones in the evolution of plant life histories.
Authors:
E Farnsworth; J Farrant
Related Documents :
21983409 - Electricity generation and microbial community changes in microbial fuel cells packed w...
21760929 - Enhancement of late successional plants on ex-arable land by soil inoculations.
21796209 - Carbon loss from an unprecedented arctic tundra wildfire.
21972119 - Investigating the phytotoxicity of the graminicide fluazifop-p-butyl against native uk ...
22065419 - The response of diatom central carbon metabolism to nitrogen starvation is different fr...
24133849 - Forced-air warming design: evaluation of intake filtration, internal microbial buildup,...
17376569 - Effects of spatial and temporal variation in metal availability on earthworms in floodp...
20884799 - Implementing a rational and consistent nomenclature for serine/arginine-rich protein sp...
20226499 - Evaluating real-time air-quality data as earthquake indicator.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of botany     Volume:  85     ISSN:  0002-9122     ISO Abbreviation:  Am. J. Bot.     Publication Date:  1998 Jun 
Date Detail:
Created Date:  2011-06-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370467     Medline TA:  Am J Bot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  760     Citation Subset:  -    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  The features of cotyledon areoles in Leguminosae and their systematic utility.
Next Document:  Mentor effects in wild species of Helianthus (Asteraceae).