Mature spores of four pleurocarpous mosses in the Canary Islands: ultrastructure and early germination stages

Alfayate, Carmen; Ron, Eugenia; Estébanez, Belén; Pérez-Batista, Miguel Ángel

doi:10.1639/0007-2745-116.2.097

Cited by 13 publications

(8 citation statements)

References 34 publications

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“…Sim-Sim et al (2017) reconstructed the phylogeny of this genus using morphological and anatomical characters, and indicated six species for the genus: Amphidium lapponicum, A. mougeotii, A. tortuosum, A. californicum, A. curvipes, and A. asiaticum. Palynological studies dealing with bryophyte species have made important advances since the 1980s regarding the taxonomy, ecology, and phylogeny of the group (Mogensen 1981;Luizi-Ponzo & Barth 1998;1999;Luizi-Ponzo & Melhem 2006a;b;Caldeira et al 2006;2009;Rocha et al 2008;Savaroglu & Erkara 2008;Alfayate et al 2013;Rodrigues & Luizi-Ponzo 2015;Silva-e-Costa et al 2017). However, studies on Amphidium have focused mostly on morphological and molecular characters (Rooy 1992;Goffinet et al 1998;Stech 1999;Farge et al 2000;2002;Frahm et al 2000;Tsubota et al 2003;Hedderson et al 2004;Stech 2004;Stech & Frey 2008;Stech et al 2012;Sim-Sim et al 2017), with palynological information on its species remaining rare (Hirohama 1977) or only briefly summarized in some taxonomic studies (Rooy 1992;Gradstein et al 2001;Allen 2002), in which they were described as "subrounded", "small", "apparently ornamented", "slightly papillose" or "having a smooth sporoderm".…”

Section: Introductionmentioning

confidence: 99%

Palynology of Amphidium Schimp. (Amphidiaceae M. Stech): can spore morphology circumscribe the genus?

Passarella

Luizi-Ponzo

2019

Acta Bot. Bras.

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Amphidium Schimp. is characterized by cushion-forming erect primary stems, linear-lanceolate leaves, and gymnostome capsules. The phylogenetic position of Amphidium is uncertain, with the genus having been variously included in Zygodontaceae Schimp., Rhabdoweisiaceae Limpr., Orthotrichaceae Arn. and Amphidiaceae M. Stech. A palynological investigation was performed of the three species of the genus that occur in the Americas: Amphidium lapponicum (Hedw.) Schimp., Amphidium mougeotii (Bruch & Schimp.) Schimp., and Amphidium tortuosum (Hornsch.) Cufod. Spores were observed and measured for greatest diameter under light microscopy both before and after acetolysis. Non-acetolyzed spores were observed under scanning electron microscopy to assess surface ornamentation of the sporoderm. All spores observed were smaller than 20 µm and heteropolar, with surface ornamentation reflecting a combination of different elements, such as gemmae, rugulae and perforations. The palynological characteristics observed here suggest that the genus Amphidium, and thus its contained species, be placed in their own family.

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Section: Introductionmentioning

confidence: 99%

Palynology of Amphidium Schimp. (Amphidiaceae M. Stech): can spore morphology circumscribe the genus?

Passarella

Luizi-Ponzo

2019

Acta Bot. Bras.

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“…Spore morphology and ontogeny are important for evaluating bryophytes taxonomy and phylogeny, as evidenced by several studies (Clarke 1979;Horton 1982;Mishler & Churchill 1984;Blackmore & Barnes 1987;Brown & Lemmon 1980;1984a;b;1988;1991;Estébanez et al 1997;Luizi-Ponzo et al 1997;Caldeira et al 2006;Luizi-Ponzo & Melhem 2006a;b;Yano & Luizi-Ponzo 2006;2011;Savaroglu et al 2007;Rocha et al 2008;Savaroglu & Erkara 2008;Alfayate et al 2013;Brown et al 2015;Rodrigues & Luizi-Ponzo 2015;Savaroglu 2015;Savaroglu et al 2017;Silva-e-Costa et al 2017). Nonetheless, data are still scarce for Erpodiaceae (Erdtman 1965), or have been reported in taxonomic studies (Pursell 1966;1994;Crum 1972;Yano 1984;Yano & Santos 1993;Stone 1997;Pursell & Allen 2002;Daniels et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Complex sporoderm structure in bryophyte spores: a palynological study of Erpodiaceae Broth.

Luizi-Ponzo

Silva-e-Costa

2019

Acta Bot. Bras.

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Palynological studies of bryophytes are critical for evaluating the taxonomic relevance of their spores. They also provide important support to paleoecological investigations that, usually, treat bryophytes as a whole, which does not permit the evaluation of specific functional traits of a special taxonomic unit. The present study investigated the morphology and ultrastructure of spores of five species of Erpodiaceae (Bryophyta), and assessed the implications for taxonomy and the recognition of spores of past records. Erpodiaceae includes corticolous and saxicolous plants that are widely distributed throughout tropical and temperate regions. The spores were found to be isomorphic and apolar with a subcircular amb, granulate, inaperturate. The sporoderm possesses a perine, an exine and a stratified intine. The perine is largely responsible for spore surface ornamentation. The occurrence of exine projections, in isolation or sustaining the elements of the perine, characterizes sporoderm structure with features similar to that of a semitectum, a distinctive characteristic that has not been reported previously for bryophyte spores.

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“…Many studies exist related to the germination of bryophyte spores, their stages of development and the factors influencing their success, as water and light availability, type of substrate, seasonality, among others, has been developed especially for mosses and liverworts (Inoue 1960;Vallane 1966;1971;Udar & Srivastava 1970;Mogensen 1978;Olesen & Mogensen 1978;Brown & Lemmon 1988;Alcade et al 1996;McLetchie 2001;Wiklund & Rydin 2004;Zhao et al 2004;Maciel-Silva et al 2009a;Alfayate et al 2013). Vallane (1966;1971) studied the germination of spores of Ceratodon purpureus.…”

Section: Introductionmentioning

confidence: 99%

“…Bisang (1987), in turn, studied sporeling morphology and development in Frullania tamarisci. The nutritive medium of Knop has been used in several works of bryophytes physiology (Horikawa & Nehira 1960;Udar & Srivastava 1970;Nehira 1988;Alcade et al 1996;Duckett et al 2004;Chen et al 2009;Maciel-Silva et al 2009a;Awasthi et al 2012;Alfayate et al 2013;Sahu & Asthana 2013;Krishnan & Murugan 2014; among others), including using diluted concentrations. However, none of these studies evaluate if the dilution or concentration of nutrients recommended affects the development of protonema; the attention is directed to the use of different culture media.…”

Section: Introductionmentioning

confidence: 99%

Spore germination, early development and some notes on the effects of in vitro culture medium on Frullania ericoides (Nees) Mont. (Frullaniaceae, Marchantiophyta)

et al. 2017

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In bryophytes, establishment can occur by a sexual or asexual process, but the production of spores enables colonization of a wider range of habitats and substrates than can asexual propagules. Successful germination is critical for establishment in a new environment. Th is paper addresses germination and sporeling development in Frullania ericoides, a leafy liverwort species. Fresh spores were inoculated in vitro in diff erent culture strengths of Knop's nutrient solution (one-fourth strength, half strength, full strength, one and a half strength and double strength), in order to evaluate the eff ects of this solution on spore germination and on the development of external protonema. On the fi rst assessment, spore germination was observed at all the concentrations. Germination was endosporic, with cell division and proliferation, resulting in a globular protonema, within the spore wall. Beginning at the fourth week, the development of tightly concave primordial leaves was observed in all but the double-strength medium. Th roughout the period of study, the treatments with lower concentrations exhibited external protonema with greater lengths. Th e double-strength treatment was statistically diff erent from other treatments in at least two parameters. Th e results of this study demonstrate the potential of in vitro culture techniques for bryophyte spore studies and germplasm preservation.

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Mature spores of four pleurocarpous mosses in the Canary Islands: ultrastructure and early germination stages

Cited by 13 publications

References 34 publications

Palynology of Amphidium Schimp. (Amphidiaceae M. Stech): can spore morphology circumscribe the genus?

Palynology of Amphidium Schimp. (Amphidiaceae M. Stech): can spore morphology circumscribe the genus?

Complex sporoderm structure in bryophyte spores: a palynological study of Erpodiaceae Broth.

Spore germination, early development and some notes on the effects of in vitro culture medium on Frullania ericoides (Nees) Mont. (Frullaniaceae, Marchantiophyta)

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