Document Detail


A new type of specialized morphophysiological dormancy and seed storage behaviour in Hydatellaceae, an early-divergent angiosperm family.
MedLine Citation:
PMID:  20338953     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND AND AIMS: Recent phylogenetic analysis has placed the aquatic family Hydatellaceae as an early-divergent angiosperm. Understanding seed dormancy, germination and desiccation tolerance of Hydatellaceae will facilitate ex situ conservation and advance hypotheses regarding angiosperm evolution.
METHODS: Seed germination experiments were completed on three species of south-west Australian Hydatellaceae, Trithuria austinensis, T. bibracteata and T. submersa, to test the effects of temperature, light, germination stimulant and storage. Seeds were sectioned to examine embryo growth during germination in T. austinensis and T. submersa.
KEY RESULTS: Some embryo growth and cell division in T. austinensis and T. submersa occurred prior to the emergence of an undifferentiated embryo from the seed coat ('germination'). Embryo differentiation occurred later, following further growth and a 3- to 4-fold increase in the number of cells. The time taken to achieve 50 % of maximum germination for seeds on water agar was 50, 35 and 37 d for T. austinensis, T bibracteata and T. submersa, respectively.
CONCLUSIONS: Seeds of Hydatellaceae have a new kind of specialized morphophysiological dormancy in which neither root nor shoot differentiates until after the embryo emerges from the seed coat. Seed biology is discussed in relation to early angiosperm evolution, together with ex situ conservation of this phylogenetically significant group.
Authors:
Renee E Tuckett; David J Merritt; Paula J Rudall; Fiona Hay; Stephen D Hopper; Carol C Baskin; Jerry M Baskin; Julia Tratt; Kingsley W Dixon
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-25
Journal Detail:
Title:  Annals of botany     Volume:  105     ISSN:  1095-8290     ISO Abbreviation:  Ann. Bot.     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-26     Completed Date:  2010-09-15     Revised Date:  2011-07-28    
Medline Journal Info:
Nlm Unique ID:  0372347     Medline TA:  Ann Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  1053-61     Citation Subset:  IM    
Affiliation:
School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, Crawley 6009, Western Australia.
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MeSH Terms
Descriptor/Qualifier:
Acclimatization / physiology*
Angiosperms / physiology*
Australia
Biological Evolution
Plant Shoots / physiology
Seed Storage Proteins / physiology*
Seeds / anatomy & histology*
Temperature
Water
Grant Support
ID/Acronym/Agency:
//Wellcome Trust
Chemical
Reg. No./Substance:
0/Seed Storage Proteins; 7732-18-5/Water
Comments/Corrections

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