Can the meiotic sex ratio explain the sex ratio bias in adult populations in the dioicous moss <i>Drepanocladus lycopodioides</i>?

Bisang, Irene; Hedenäs, Lars; Cronberg, Nils

doi:10.1080/03736687.2016.1264662

Cited by 16 publications

(13 citation statements)

References 41 publications

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“…With our current data, it is not possible to isolate when in the life cycle male and female demography diff er, nor whether the two sexes exhibit diff erent microhabitat preferences. However, the observed pattern of lower male diversity (i.e., suggesting elevated male mortality) indicates that the interaction between male physiology and extrinsic environmental factors are more likely to govern population sex ratio than exclusively intrinsic factors like sex ratio distorters ( McDaniel et al, 2007 ;Norrell et al, 2014 ;Bisang et al, 2017 ). Indeed, the available evidence suggests that S. caninervis female-biased phenotypic sex ratios in Mojave Desert populations correlate with precipitation and temperature ( Bowker et al, 2000 ).…”

Section: Discussionmentioning

confidence: 99%

Multiple factors influence population sex ratios in the Mojave Desert moss Syntrichia caninervis

Baughman

Payton

Paasch

et al. 2017

American J of Botany

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Section: Discussionmentioning

confidence: 99%

Multiple factors influence population sex ratios in the Mojave Desert moss Syntrichia caninervis

Baughman

Payton

Paasch

et al. 2017

American J of Botany

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“…In the Mojave Desert only 11 males were found among 700 individuals examined (Stark et al, 2005). The causes and genetic repercussions of such skewed ratios are now being explored (Bisang and Hedenäs, 2005;Bisang et al, 2015Bisang et al, , 2017Baughman et al, 2017;Brzyski et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…The female-biased ratio, the widespread dioicy (Bisang and Hedenäs, 2005;Bisang et al, 2017) and the prominent role of clonality in bryophytes may account for the incidence of SSS with over 20 cases reported at a large geographic scale (Schuster, 1983;Stark et al, 2005;Bisang et al, 2015). In fact, the most extreme examples of SSS in plants are found in bryophytes.…”

Section: Introductionmentioning

confidence: 99%

Population Genomics and Phylogeography of a Clonal Bryophyte With Spatially Separated Sexes and Extreme Sex Ratios

et al. 2020

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The southern Appalachian (SA) is one of the most biodiversity−rich areas in North America and has been considered a refugium for many disjunct plant species, from the last glacial period to the present. Our study focuses on the SA clonal hornwort, Nothoceros aenigmaticus J. C. Villarreal & K. D. McFarland. This hornwort was described from North Carolina and is widespread in the SA, growing on rocks near or submerged in streams in six and one watersheds of the Tennessee (TR) and Alabama (AR) Rivers, respectively. Males and female populations occur in different watersheds, except in the Little Tennessee (TN) River where an isolated male population exists ca. 48 km upstream from the female populations. The sex ratio of 1:0 seems extreme in each population. In this study, we use nuclear and organellar microsatellites from 250 individuals from six watersheds (seven populations) in the SA region and two populations from Mexico (23 individuals). We, then, selected 86 individuals from seven populations and used genotyping by sequencing to sample over 600 bi-allelic markers. Our results suggest that the SA N. aenigmaticus and Mexican plants are a nested within a clade of sexual tropical populations. In the US populations, we confirm an extreme sex ratio and only contiguous US watersheds share genotypes. The phylogenetic analysis of SNP data resolves four clusters: Mexican populations, male plants (Little Pigeon and Pigeon river watersheds) and two clusters of female plants; one from the Little Tennessee and Hiwassee Rivers (TR) and the other from the Ocoee (TR) and Coosa (AR) Rivers. All clusters are highly differentiated (Fst values over 0.9). In addition, our individual assignment analyses and PCAs reflect the phylogenetic results grouping the SA samples in three clades and recovering males and female plants with high genetic differentiation (Fst values between 0.5 and 0.9 using microsatellites and bi-allelic markers). Our results point to Pleistocene events shaping the biogeographical pattern seen in US populations. The extreme sex ratio reflects isolation and highlights the high vulnerability of the populations in the SA.

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“…On the other hand, anisospory has been linked to dwarfi sm in some groups of mosses (Ramsay 1979;Glime & Bisang 2017). After sporogenesis, as usual, the spores will give two female and two male gametophytes, but the fi nal ratio is generally strongly female-biased; however, the expressed sex rates can be a consequence of habitat or ecological conditions Bisang et al 2017). As represented in Figures 2-4, in Homalothecium sericeum s.s. and H. meridionale, the presence of spores of diff erent sizes in the same capsule were clearly observed.…”

Section: Is There a Dominance Of Female Samples Over Male Plants/ Colonies Observed In The Herbarium Samples Studied?mentioning

confidence: 97%

Dimorphic Sexual Expression and Anisospory in Homalothecium sericeum Schimp. s.l. (Brachytheciaceae) in Portugal

Sérgio

Sim‐Sim

García

2020

Cryptogamie, Bryologie

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Among terrestrial plant species, male dwarfi sm (nannandry) is a unique feature of bryophytes, common in numerous dioicous pleurocarpous mosses. In this study, our objective was to describe and to elucidate the incidence of dwarf males in Portuguese populations of Homalothecium sericeum (Hedw.) Schimp and H. meridionale (M. Fleisch. & Warnst.) Hedenäs. We also evaluated the occurrence of sporophytes and of dwarf males, in 150 selected samples from the LISU herbarium collection. Th e results showed that most samples are heteromorphic, with sporophytes, and include dwarf males, independent marginal male branches and/or caducous brood branches as vegetative propagules. Th e samples containing only independent male plants are infrequent. Anisospory was observed in both species, with a perceptible bimodal distribution of spore size in both species. Moreover, in Portugal no diff erences were found between the two species of this complex concerning the presence and relative position of male plants, the occurrence of anisospory, or the strategies exhibited by male plants, such as nannandry and caducous branches.

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Can the meiotic sex ratio explain the sex ratio bias in adult populations in the dioicous moss Drepanocladus lycopodioides?

Cited by 16 publications

References 41 publications

Multiple factors influence population sex ratios in the Mojave Desert moss Syntrichia caninervis

Multiple factors influence population sex ratios in the Mojave Desert moss Syntrichia caninervis

Population Genomics and Phylogeography of a Clonal Bryophyte With Spatially Separated Sexes and Extreme Sex Ratios

Dimorphic Sexual Expression and Anisospory in Homalothecium sericeum Schimp. s.l. (Brachytheciaceae) in Portugal

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