TITLE

Limitations to Reproductive Output and Genetic Rescue in Populations of the Rare Shrub Grevillea repens (Proteaceae)

AUTHOR(S)
G. D. Holmes; E. A. James; A. A. Hoffmann
PUB. DATE
December 2008
SOURCE
Annals of Botany;Dec2008, Vol. 102 Issue 6, p1031
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background and Aims When conserving rare plant species, managers are often faced with small and/or isolated populations displaying low levels of sexual reproduction and genetic variation. One option for reinvigorating these populations is the introduction of genetic material from other sites, but in some cases fitness may be reduced as a result of outbreeding depression. Here the pollination biology of the rare shrub Grevillea repens is studied across its natural range and reproductive responses following cross-pollination among populations are examined to determine factors that may be limiting sexual reproduction and the potential for genetic rescue. Methods Pollen manipulation treatments (self-, autogamous self-, cross- and open pollination) were applied to flowers to examine the breeding system and fruit and seed production in five populations of G. repens. Pollen production, presentation and viability were investigated and interpopulation crosses of increasing genetic distance performed among the populations. Key Results The study species is self-incompatible and displayed very low natural seed set over two seasons, due partly to low pollen viability in one of the populations. Within-population crossing increased fruit and seed production at some sites, indicating pollinator limitation. Interpopulation crosses further increased reproductive output in one population, suggesting mate limitation, and for this site there was a positive relationship between genetic distance among populations and the size of genetic rescue benefits. However, in other populations there was a decrease in fruit and seed set with increasing genetic distance. Conclusions The results highlight that management strategies involving interpopulation crosses can improve reproductive output in small, isolated populations of rare plants, but guidelines need to be developed on a population by population basis.
ACCESSION #
35291722

 

Related Articles

  • Reproductive isolation in the Aegean Ophrys omegaifera complex (Orchidaceae). Schl├╝ter, P. M.; Ruas, P. M.; Kohl, G.; Ruas, C. F.; Stuessy, T. F.; Paulus, H. F. // Plant Systematics & Evolution;Sep2007, Vol. 267 Issue 1-4, p105 

    The orchid genus Ophrys operates a system of sexual deception by which high specificity of pollination is attained. Reproductive isolation in Ophrys mainly rests upon prezygotic isolation mechanisms. The level of genetic separateness of Ophrys taxa with different pollinators is therefore likely...

  • Interspecific reproductive barriers in the tomato clade: opportunities to decipher mechanisms of reproductive isolation. Bedinger, Patricia; Chetelat, Roger; McClure, Bruce; Moyle, Leonie; Rose, Jocelyn; Stack, Stephen; Knaap, Esther; Baek, You; Lopez-Casado, Gloria; Covey, Paul; Kumar, Aruna; Li, Wentao; Nunez, Reynaldo; Cruz-Garcia, Felipe; Royer, Suzanne // Sexual Plant Reproduction;Sep2011, Vol. 24 Issue 3, p171 

    The tomato clade within the genus Solanum has numerous advantages for mechanistic studies of reproductive isolation. Its thirteen closely related species, along with four closely allied Solanum species, provide a defined group with diverse mating systems that display complex interspecific...

  • Parallel Ecological Speciation in Plants? Ostevik, Katherine L.; Moyers, Brook T.; Owens, Gregory L.; Rieseberg, Loren H. // International Journal of Ecology;2012, p1 

    Populations that have independently evolved reproductive isolation from their ancestors while remaining reproductively cohesive have undergone parallel speciation. A specific type of parallel speciation, known as parallel ecological speciation, is one of several forms of evidence for ecology's...

  • Pollen competition and environmental effects on hybridization dynamics between Phlox drummondii and Phlox cuspidata. Ruane, Lauren G.; Donohue, Kathleen // Evolutionary Ecology;Mar2008, Vol. 22 Issue 2, p229 

    Pollen competition between species strongly influences hybridization dynamics in plants. By performing single- and mixed-donor pollinations, we show that soil Ca alters the outcome of interspecific pollen competition in the annual Phlox hybrid system of Phlox cuspidata and P. drummondii. In the...

  • Sexual isolation in two bee-pollinated Costus (Costaceae). Chen, Grace // Plant Reproduction;Mar2013, Vol. 26 Issue 1, p3 

    Examining reproductive isolating barriers is essential for understanding processes of speciation. Sexual isolation has been shown to contribute to speciation in many sympatric taxa; however, its role in parapatric taxa with reduced interspecific gene flow is poorly understood. I investigated the...

  • The impacts of pollination mode, plant characteristics and local density on the reproductive success of a scarce plant species, Salix arbuscula. Shaw, Rosalind F.; Elston, David A.; Pakeman, Robin J.; Young, Mark R.; Iason, Glenn R. // Plant Ecology;Dec2010, Vol. 211 Issue 2, p367 

    Pollination failure represents one stage at which sexual reproduction of plants may be limited. It is therefore important to understand the pollination mechanism of the plant and how this may be affected by plant and population characteristics. This study examined the reproductive biology of a...

  • Pollination Makes the World Go 'Round.  // Exploring the Native Plant World: A Life Science Curriculum 5th-;2004, p10 

    This article provides information on pollination. Pollination refers to a step in a reproductive cycle of the plants that involves the transferring of pollen from one flower to another of the same plant species. Insects and animals serves as the pollinators, ensuring the continuation of the...

  • Reproductive biology and isolation mechanisms in rupicolous species of the Acianthera prolifera complex (Orchidaceae) occurring in southeastern Brazil. Melo, Marcos; Taucce, Pedro; Borba, Eduardo // Plant Systematics & Evolution;May2011, Vol. 293 Issue 1-4, p161 

    We studied the floral biology and performed experimental intra- and interspecific pollinations in populations of a complex of four Acianthera (Orchidaceae) species occurring in Brazilian campo rupestre vegetation ( A. hamosa, A. limae, A. modestissima, and A. prolifera). All four species flower...

  • Rarity and reproductive biology: habitat specialists reveal a complex relationship. Miller-Struttmann, Nicole E. // Botany;Jun2013, Vol. 91 Issue 6, p349 

    Understanding how species with historically fragmented populations are able to persist will provide insights into which factors may be important for the maintenance of newly fragmented populations. Plants with fragmented and isolated populations, such as habitat-specialist (HS) species, are...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics