Microsatellite evidence for high clonality and limited genetic diversity in Ziziphus celata (Rhamnaceae), an endangered, self-incompatible shrub endemic to the Lake Wales Ridge, Florida, USA

Gitzendanner, Matthew A.; Weekley, Carl W.; Germain-Aubrey, Charlotte C.; Soltis, Douglas E.; Soltis, Pamela S.

doi:10.1007/s10592-011-0287-9

Cited by 48 publications

(34 citation statements)

References 46 publications

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“…; Gitzendanner et al . ). Of the 10 highest ratios, half were self‐incompatible plants, yet only 22 cross/inbred comparisons were for self‐incompatible species.…”

Section: Resultsmentioning

confidence: 97%

“…GR ratios ranged from 0.86 (mildly deleterious) in Lymnea stagnalis snails to infinity in Ziziphus celata plants (where the inbred self-incompatible populations only set seed after outcrossing: Weekley et al 2002;Gitzendanner et al 2012). Of the 10 highest ratios, half were self-incompatible plants, yet only 22 cross/inbred comparisons were for self-incompatible species.…”

Section: Consistency Of Fitness Effectsmentioning

confidence: 99%

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Genetic rescue of small inbred populations: meta‐analysis reveals large and consistent benefits of gene flow

2015

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Many species have fragmented distribution with small isolated populations suffering inbreeding depression and/or reduced ability to evolve. Without gene flow from another population within the species (genetic rescue), these populations are likely to be extirpated. However, there have been only ~ 20 published cases of such outcrossing for conservation purposes, probably a very low proportion of populations that would potentially benefit. As one impediment to genetic rescues is the lack of an overview of the magnitude and consistency of genetic rescue effects in wild species, I carried out a meta-analysis. Outcrossing of inbred populations resulted in beneficial effects in 92.9% of 156 cases screened as having a low risk of outbreeding depression. The median increase in composite fitness (combined fecundity and survival) following outcrossing was 148% in stressful environments and 45% in benign ones. Fitness benefits also increased significantly with maternal ΔF (reduction in inbreeding coefficient due to gene flow) and for naturally outbreeding versus inbreeding species. However, benefits did not differ significantly among invertebrates, vertebrates and plants. Evolutionary potential for fitness characters in inbred populations also benefited from gene flow. There are no scientific impediments to the widespread use of outcrossing to genetically rescue inbred populations of naturally outbreeding species, provided potential crosses have a low risk of outbreeding depression. I provide revised guidelines for the management of genetic rescue attempts.

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“…; Gitzendanner et al . ). Of the 10 highest ratios, half were self‐incompatible plants, yet only 22 cross/inbred comparisons were for self‐incompatible species.…”

Section: Resultsmentioning

confidence: 97%

Section: Consistency Of Fitness Effectsmentioning

confidence: 99%

Genetic rescue of small inbred populations: meta‐analysis reveals large and consistent benefits of gene flow

2015

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“…Thus, to compensate for genotyping errors and possible somatic mutations, we chose a threshold of one mutation step to differentiate MLLs, as found in other studies ( e . g ., [68]). Since pairwise MLGs differed by at least two mutation steps, all distinct MLGs were considered as distinct MLLs.…”

Section: Resultsmentioning

confidence: 99%

Superclone Expansion, Long-Distance Clonal Dispersal and Local Genetic Structuring in the Coral Pocillopora damicornis Type β in Reunion Island, South Western Indian Ocean

et al. 2017

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The scleractinian coral Pocillopora damicornis type β is known to present a mixed reproduction mode: through sexual reproduction, new genotypes are created, while asexual reproduction insures their propagation. In order to investigate the relative proportion of each reproduction mode in P. damicornis type β populations from Reunion Island, Indian Ocean, clonal propagation along the west coast was assessed through four sampling sites with increasing geographical distance between sites. Coral colonies were sampled either exhaustively, randomly or haphazardly within each site, and genotypic diversity was assessed using 13 microsatellite loci over a total of 510 P. damicornis type β determined a posteriori from their mtDNA haplotype (a 840 bp sequenced fragment of the Open Reading Frame). Overall, 47% of all the sampled colonies presented the same multi-locus genotype (MLG), a superclone, suggesting that asexual propagation is extremely important in Reunion Island. Within each site, numerous MLGs were shared by several colonies, suggesting local clonal propagation through fragmentation. Moreover, some of these MLGs were found to be shared among several sites located 40 km apart. While asexual reproduction by fragmentation seems unlikely over long distances, our results suggest a production of parthenogenetic larvae. Despite shared MLGs, two differentiated clusters were enclosed among populations of the west coast of Reunion Island, revealing the necessity to set up appropriate managing strategies at a local scale.

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“…Supporting the hypotheses partly, empirical studies generally report high genetic diversity in sexuals such as Oenothera spp. (Godfrey and Johnson, 2014) and a narrow genetic base in asexuals such as Ziziphus celata (Gitzendanner et al, 2012) and Gagea spathacea (Pfeiffer et al, 2012). Although, genetic diversity is predicted to safe guard populations from infections (Rice, 2002; Keesing et al, 2010; Civitello et al, 2015), the amount of genetic diversity needed for a population to prevent disease spread is not clear (King and Lively, 2012).…”

Section: Introductionmentioning

confidence: 99%

Analyses between Reproductive Behavior, Genetic Diversity and Pythium Responsiveness in Zingiber spp. Reveal an Adaptive Significance for Hemiclonality

et al. 2016

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Mode of reproduction is generally considered to have long-range evolutionary implications on population survival. Because sexual reproduction produces genetically diverse genotypes, this mode of reproduction is predicted to positively influence the success potential of offspring in evolutionary arms race with parasites (Red queen) whereas, without segregation and recombination, the obligate asexual multiplication may push a species into extinction due to the steady accumulation of deleterious mutations (Muller’s ratchet). However, the extent of linearity between reproductive strategies, genetic diversity and population fitness, and the contributions of different breeding strategies to population fitness are yet to be understood clearly. Genus Zingiber belonging to the pan-tropic family Zingiberaceae represents a good system to study contributions of different breeding behavior on genetic diversity and population fitness, as this genus comprises species with contrasting breeding systems. In this study, we analyzed breeding behavior, amplified fragment length polymorphism diversity and response to the soft-rot pathogen Pythium aphanidermatum in 18 natural populations of three wild Zingiber spp.: Z. neesanum, Z. nimmonii, and Z. zerumbet, together with the obligately asexual cultivated congener, ginger (Z. officinale). Ginger showed an exceptionally narrow genetic base, and adding to this, all the tested cultivars were uniformly susceptible to soft-rot. Concordant with the postulates of Muller’s ratchet, the background selection may be continuously pushing ginger into the ancestral state, rendering it inefficient in host-pathogen coevolution. Z. neesanum and Z. nimmonii populations were sexual and genetically diverse; however, contrary to Red Queen expectations, the populations were highly susceptible to soft-rot. Z. zerumbet showed a hemiclonal breeding behavior. The populations inhabiting forest understory were large and continuous, sexual and genetically diverse, but were susceptible, whereas populations inhabiting the revenue land were fragmented and monoclonal, but were resistant. It may be possible that, when genetic recombination becomes at a premium due to the genetic constraints imparted by habitat fragmentation or pathogen pressure, Z. zerumbet

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Microsatellite evidence for high clonality and limited genetic diversity in Ziziphus celata (Rhamnaceae), an endangered, self-incompatible shrub endemic to the Lake Wales Ridge, Florida, USA

Cited by 48 publications

References 46 publications

Genetic rescue of small inbred populations: meta‐analysis reveals large and consistent benefits of gene flow

Genetic rescue of small inbred populations: meta‐analysis reveals large and consistent benefits of gene flow

Superclone Expansion, Long-Distance Clonal Dispersal and Local Genetic Structuring in the Coral Pocillopora damicornis Type β in Reunion Island, South Western Indian Ocean

Analyses between Reproductive Behavior, Genetic Diversity and Pythium Responsiveness in Zingiber spp. Reveal an Adaptive Significance for Hemiclonality

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