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Authors Sinclair, EA; Statton, J; Hovey, R; Anthony, JM; Dixon, KW; Kendrick, GA
Author Full Name Sinclair, Elizabeth A.; Statton, John; Hovey, Renae; Anthony, Janet M.; Dixon, Kingsley W.; Kendrick, Gary A.
Title Reproduction at the extremes: pseudovivipary, hybridization and genetic mosaicism in Posidonia australis (Posidoniaceae)
Source ANNALS OF BOTANY
Language English
Document Type Article
Author Keywords Pseudovivipary; reproduction; seagrass; seed abortion; Posidonia australis; seagrass; heat wave; salinity; hybridization; somatic mutation; genetic mosaicism; clonality; evolution
Keywords Plus EELGRASS ZOSTERA-MARINA; NUCLEAR-DNA PHYLOGENIES; WESTERN-AUSTRALIA; SHARK BAY; ASEXUAL REPRODUCTION; CHROMOSOME-NUMBERS; FLOWERING PLANTS; CLONAL SEAGRASS; MATING SYSTEM; DIVERSITY
Abstract Background and Aims Organisms occupying the edges of natural geographical ranges usually survive at the extreme limits of their innate physiological tolerances. Extreme and prolonged fluctuations in environmental conditions, often associated with climate change and exacerbated at species' geographical range edges, are known to trigger alternative responses in reproduction. This study reports the first observations of adventitious inflorescence-derived plantlet formation in the marine angiosperm Posidonia australis, growing at the northern range edge (upper thermal and salinity tolerance) in Shark Bay, Western Australia. These novel plantlets are described and a combination of microsatellite DNA markers and flow cytometry is used to determine their origin. Methods Polymorphic microsatellite DNA markers were used to generate multilocus genotypes to determine the origin of the adventitious inflorescence-derived plantlets. Ploidy and genome size were estimated using flow cytometry. Key Results All adventitious plantlets were genetically identical to the maternal plant and were therefore the product of a novel pseudoviviparous reproductive event. It was found that 87% of the multilocus genotypes contained three alleles in at least one locus. Ploidy was identical in all sampled plants. The genome size (2C value) for samples from Shark Bay and from a separate site much further south was not significantly different, implying they are the same ploidy level and ruling out a complete genome duplication (polyploidy). Conclusions Survival at range edges often sees the development of novel responses in the struggle for survival and reproduction. This study documents a physiological response at the trailing edge, whereby reproductive strategy can adapt to fluctuating conditions and suggests that the lower-than-usual water temperature triggered unfertilized inflorescences to ` switch' to growing plantlets that were adventitious clones of their maternal parent. This may have important long-term implications as both genetic and ecological constraints may limit the ability to adapt or rangeshift; this seagrass meadow in Shark Bay already has low genetic diversity, no sexual reproduction and no seedling recruitment.
Author Address [Sinclair, Elizabeth A.; Statton, John; Hovey, Renae; Anthony, Janet M.; Dixon, Kingsley W.; Kendrick, Gary A.] Univ Western Australia, Sch Plant Biol, Crawley, WA 6009, Australia; [Sinclair, Elizabeth A.; Anthony, Janet M.; Dixon, Kingsley W.] Kings Pk & Bot Gardens, Perth, WA 6005, Australia; [Sinclair, Elizabeth A.; Statton, John; Hovey, Renae; Kendrick, Gary A.] Univ Western Australia, Oceans Inst, Crawley, WA 6009, Australia; [Dixon, Kingsley W.] Curtin Univ, Environm & Agr, Bentley, WA 6102, Australia
Reprint Address Sinclair, EA (corresponding author), Univ Western Australia, Sch Plant Biol, Crawley, WA 6009, Australia.; Sinclair, EA (corresponding author), Kings Pk & Bot Gardens, Perth, WA 6005, Australia.; Sinclair, EA (corresponding author), Univ Western Australia, Oceans Inst, Crawley, WA 6009, Australia.
E-mail Address esinclair@iinet.net.au
ResearcherID Number Kendrick, Gary Andrew/B-3460-2011; dixon, kingsley w/A-8133-2016; Sinclair, Elizabeth/B-1179-2011
ORCID Number Kendrick, Gary Andrew/0000-0002-0276-6064; dixon, kingsley w/0000-0001-5989-2929; Sinclair, Elizabeth/0000-0002-5789-8945; hovey, renae/0000-0003-0308-3609
Funding Agency and Grant Number ARC LinkageAustralian Research Council [LP100200429, LP130100918]; Cockburn Cement Ltd; Department of Parks and Wildlife; Botanic Gardens and Parks Authority; Shark Bay Salt
Funding Text This project was funded by two ARC Linkage grants to G.A.K. and K.W.D. (LP100200429, LP130100918) at the University of Western Australia, with industry partners Cockburn Cement Ltd, Department of Parks and Wildlife (previously Environment and Conservation), Botanic Gardens and Parks Authority, and Shark Bay Salt. Thanks to Mark Wallace, Matt Barrett, Tony Scalzo and Thorston Reusch for technical support and discussions, and Sophie Arnaud-Haond and one anonymous reviewer for their constructive comments.
Times Cited 15
Total Times Cited Count (WoS, BCI, and CSCD) 15
Publisher OXFORD UNIV PRESS
Publisher City OXFORD
Publisher Address GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN 0305-7364
29-Character Source Abbreviation ANN BOT-LONDON
ISO Source Abbreviation Ann. Bot.
Publication Date FEB
Year Published 2016
Volume 117
Issue 2
Beginning Page 237
Ending Page 247
Digital Object Identifier (DOI) 10.1093/aob/mcv162
Page Count 11
Web of Science Category Plant Sciences
Subject Category Plant Sciences
Document Delivery Number DD8RO
Unique Article Identifier WOS:000370194800002
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