Polymorphism in the brown alga Dictyota dichotoma (Dictyotales, Phaeophyceae) from Korea

Hwang, Il-Ki; Kim, Hyungseop; Lee, Wook Jae

doi:10.1007/s00227-005-1623-8

Cited by 45 publications

(49 citation statements)

References 8 publications

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“…In contrast, in the population from Spain (Tronholm et al 2010b), fertile sporophytes were constantly more numerous. In a population of D. dichotoma at Punta del Hidalgo, Spain (Tronholm et al 2008), sporophytes also dominated every month, which was interpreted by the author as a support for the hypothesis that reproduction in all dictyotalean species takes place almost entirely by means of sporangia, with sexual reproduction only occasional (Allender 1977;King and Farrant 1987;Phillips 1988;Hwang et al 2005;Tronholm et al 2008).…”

Section: Life Cyclementioning

confidence: 73%

“…Hwang et al (2005) found in D. dichotoma sensu Okamura from Korea that both sexual and asexual reproduction occurred only on the south coast, while a dominant sexual life cycle came about along the west coast and an exclusive asexual life cycle took place along the east coast, where only sporophytes existed and male or female gametophytes were apparently absent. These authors also observed asexual reproduction through in situ germination of monospores on parental thalli, which generated propagules that were released by abscission, resulting in a great amount of both free-living and attached thalli, the latter with a single stalk cell.…”

Section: Life Cyclementioning

confidence: 99%

“…Several Dictyota species have been the subject of phenological studies in many regions of the world (Peckol 1982;King and Farrant 1987;Phillips 1988;Hwang et al 2005;Tronholm et al 2008), but to date, there has been no report on seasonality of any Dictyota species in the Southern Atlantic Ocean. Also only few morphological studies exist, with an emphasis on Brazilian Dictyota species (Guimaraens and Coutinho 1996;De Castro Nunes and De Paula 2001).…”

Section: Introductionmentioning

confidence: 99%

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Temporal variations of vegetative features, sex ratios and reproductive phenology in a Dictyota dichotoma (Dictyotales, Phaeophyceae) population of Argentina

2013

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This paper addresses the phenology of a Dictyota dichotoma population from the North Patagonian coasts of Argentina. The morphology of the individuals was characterized, and analyses of the temporal variations of vegetative features, diploid and haploid life cycle generations and sex ratios are provided. Individuals, represented by growing sporophytes and gametophytes, occurred simultaneously throughout the year. Morphological variables showed temporal variation, except the width and height of medullary cells, which did not vary between seasons. All vegetative variables were significantly correlated with daylength. Besides, frond length, frond dry mass and apical and basal branching angles were significantly correlated with seawater temperatures. Vegetative thalli were less abundant than haploid and diploid thalli. Sporophytes were less abundant than male and female gametophytes. Male gametophytes dominated in May, August, October and January, and female gametophytes were more abundant in September, November, December, February and March. The formation of female gametangia showed a significant correlation with daylength, and the highest number of gametangia was registered in spring. In general, the male/female sex ratio varied between 1:2 and 1:1. Apical regions were more fertile than basal regions. Our data about frequency in the formation of reproductive structures and male/female ratios are the first recorded in the Dictyota genus and thus could not be compared with populations from other regions of the world. Significant morphological variation was observed in thalli of both life cycle generations, regarding length and dry mass, number of primary branches and branching basal angle. In general, all variables analyzed varied seasonally except cortical cell width.

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Section: Life Cyclementioning

confidence: 73%

Section: Life Cyclementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temporal variations of vegetative features, sex ratios and reproductive phenology in a Dictyota dichotoma (Dictyotales, Phaeophyceae) population of Argentina

2013

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“…Geographical variation in thallus morphology has been observed previously for other regions. Hwang et al (2005) reported changes in the thallus width of Dictyota dichotoma (Hudson) Lamouroux on the coast of Korea as a result of environmental conditions at each locality. Malbrán and Hoffmann (1990) indicated that temperature affects growth rate along the latitudinal distribution of the species.…”

Section: Reproductive Variabilitymentioning

confidence: 99%

“…Therefore, the Gulf of California is a good region to understand the ecological and physiological limits of genera and species, and if there are any vegetative or reproductive trends. Hwang et al (2005) observed differences in the proportion of sporophytes and gametophytes of a Korean Dictyota species along a longitudinal gradient. These trends could be related to biogeographical distribution of the different species composing the benthos (Roden 1964, Santamaría-del-Á ngel et al 1994.…”

mentioning

confidence: 99%

Vegetative and Reproductive Variability of Dictyota crenulata (Phaeophyta: Dictyotales) along the Central and Southwestern Gulf of California, México¹

Altamirano-Cerecedo¹,

Riosmena‐Rodríguez²

2007

Pacific Science

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Dictyota crenulata J. Agardh is widely distributed throughout the Gulf of California. Comparative analyses of morphology, anatomy, and reproductive features of this species were conducted along the central western and southwestern regions of the Gulf of California. Thalli showed geographical variations in length and apical width. No differences were observed in anatomy of vegetative thalli or relative abundance of reproductive structures. Dictyota crenulata had unilayered or multilayered medullas in the basal region and in proliferations. Most thalli presented unilayered medullas in the middle section. Our observations indicate that number of medullary layers is indeed a phenotypically plastic character, in agreement with previously published results. Variations in thallus morphology such as proliferations and length are likely the result of environmental differences, also reflected in the reproduction of D. crenulata. The southwestern region had the highest percentage of all life cycle stages (female gametophytes and sporophytes, both 22%, and vegetative thalli, 14%). Our results demonstrate morphological variability in Dictyota crenulata across its distribution in the Gulf of California.

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Brown Algae as a Model for Plant Organogenesis

Bogaert

Arun

Coelho

et al. 2012

Methods in Molecular Biology

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Brown algae are an extremely interesting, but surprisingly poorly explored, group of organisms. They are one of only five eukaryotic lineages to have independently evolved complex multicellularity, which they express through a wide variety of morphologies ranging from uniseriate branched filaments to complex parenchymatous thalli with multiple cell types. Despite their very distinct evolutionary history, brown algae and land plants share a striking amount of developmental features. This has led to an interest in several aspects of brown algal development, including embryogenesis, polarity, cell cycle, asymmetric cell division and a putative role for plant hormone signalling. This review describes how investigations using brown algal models have helped to increase our understanding of the processes controlling early embryo development, in particular polarization, axis formation and asymmetric cell division. Additionally, the diversity of life cycles in the brown lineage and the emergence of Ectocarpus as a powerful model organism, are affording interesting insights on the molecular mechanisms underlying haploid-diploid life cycles. The use of these and other emerging brown algal models will undoubtedly add to our knowledge on the mechanisms that regulate development in multicellular photosynthetic organisms.

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Polymorphism in the brown alga Dictyota dichotoma (Dictyotales, Phaeophyceae) from Korea

Cited by 45 publications

References 8 publications

Temporal variations of vegetative features, sex ratios and reproductive phenology in a Dictyota dichotoma (Dictyotales, Phaeophyceae) population of Argentina

Temporal variations of vegetative features, sex ratios and reproductive phenology in a Dictyota dichotoma (Dictyotales, Phaeophyceae) population of Argentina

Vegetative and Reproductive Variability of Dictyota crenulata (Phaeophyta: Dictyotales) along the Central and Southwestern Gulf of California, México¹

Brown Algae as a Model for Plant Organogenesis

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Polymorphism in the brown alga Dictyota dichotoma (Dictyotales, Phaeophyceae) from Korea

Cited by 45 publications

References 8 publications

Temporal variations of vegetative features, sex ratios and reproductive phenology in a Dictyota dichotoma (Dictyotales, Phaeophyceae) population of Argentina

Temporal variations of vegetative features, sex ratios and reproductive phenology in a Dictyota dichotoma (Dictyotales, Phaeophyceae) population of Argentina

Vegetative and Reproductive Variability of Dictyota crenulata (Phaeophyta: Dictyotales) along the Central and Southwestern Gulf of California, México1

Brown Algae as a Model for Plant Organogenesis

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Product

Resources

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Vegetative and Reproductive Variability of Dictyota crenulata (Phaeophyta: Dictyotales) along the Central and Southwestern Gulf of California, México¹