Infection process of Ceramium rubrum (Rhodophyta, Ceramiales) on the agarophyte Gracilaria chilensis (Rhodophyta, Gracilariales)
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Karina M. Michetti
Karina M. Michetti is a assistant researcher of the Consejo Nacional de Investigaciones Científicas y Técnicas in Argentina. She received her doctoral degree from the Universidad Nacional del Sur in Argentina, studying freshwater chaetophoralean algae. She has since worked on red seaweeds in aspects related to spore culture at laboratory conditions.
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Alicia B. Miravalles
Alicia B. Miravalles is a researcher at Universidad Nacional del Sur. Her main study area is seaweed ultrastructure. She obtained her PhD in the taxonomy, life history and epiphytism of species of
Codium growing in the Atlantic coast.Melanie H. Hughes obtained her BS in Biology at the Universidad Nacional del Sur, in Argentina. She is currently a PhD candidate at CERZOS-CONICET under the direction of Drs. Leonardi and Michetti. Her studies have been focused on agarophyte and carragenophyte red seaweeds, with emphasis on their spore culture under different conditions in the laboratory.
Patricia I. Leonardi is Associate Professor of the subjects “Biology of Algae and Fungi” and “Ultrastructure and Plant Cell Biology” at the Universidad Nacional del Sur, Bahía Blanca, Argentina. She is also Principal Researcher of the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina. She has been conducting research about the biology and ultrastructure of algae for 25 years. More recently, she also focused her investigations on microalgae cultures for the production of oils for biodiesel and value-added products.
Abstract
Epiphytism is a major problem world-wide for the Gracilaria mariculture industry that reduces the productivity of commercial farms. Most of the epiphytes associated with Gracilaria chilensis belong to the order Ceramiales. Under laboratory conditions we studied the infection process of Ceramium rubrum rhizoids on G. chilensis collected from a northern Chilean farm. The rhizoid penetration was intercellular. The host cell wall and cortical cells adjacent to the epiphyte appeared compressed and disorganized. The rhizoids presented an extensive dynamic complex endomembrane system, mainly represented by a plentiful endoplasmic reticulum (ER) network, dictyosomes, electron dense material surrounded by ER membranes, membrane bodies and vacuolar sacs with fibrillar material. Two types of cell wall deposition can be suggested: i) one characterized by the direct contact of ER vesicles with the plasmalemma and ii) another represented by the ER contributing material to the cell wall indirectly through vacuolar sacs. This study provides the basis for a better understanding of the infection process involved in the epiphyte-host interaction.
About the authors
Karina M. Michetti is a assistant researcher of the Consejo Nacional de Investigaciones Científicas y Técnicas in Argentina. She received her doctoral degree from the Universidad Nacional del Sur in Argentina, studying freshwater chaetophoralean algae. She has since worked on red seaweeds in aspects related to spore culture at laboratory conditions.
Alicia B. Miravalles is a researcher at Universidad Nacional del Sur. Her main study area is seaweed ultrastructure. She obtained her PhD in the taxonomy, life history and epiphytism of species of Codium growing in the Atlantic coast.
Melanie H. Hughes obtained her BS in Biology at the Universidad Nacional del Sur, in Argentina. She is currently a PhD candidate at CERZOS-CONICET under the direction of Drs. Leonardi and Michetti. Her studies have been focused on agarophyte and carragenophyte red seaweeds, with emphasis on their spore culture under different conditions in the laboratory.
Patricia I. Leonardi is Associate Professor of the subjects “Biology of Algae and Fungi” and “Ultrastructure and Plant Cell Biology” at the Universidad Nacional del Sur, Bahía Blanca, Argentina. She is also Principal Researcher of the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina. She has been conducting research about the biology and ultrastructure of algae for 25 years. More recently, she also focused her investigations on microalgae cultures for the production of oils for biodiesel and value-added products.
Acknowledgments
This research was supported by a European Grant INCO-DEV ICA4-CT2001-10021 and a Universidad Nacional del Sur Grant PGI 24/B196. We thank Dr MJ Dring and reviewers for helpful suggestions to improve the manuscript. KMM and PIL are research members of Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET). MHH is a fellow of the CONICET.
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Articles in the same Issue
- Frontmatter
- In this issue
- Research articles
- Genetic variation within and among asexual populations of Porphyra umbilicalis Kützing (Bangiales, Rhodophyta) in the Gulf of Maine, USA
- Notes on the marine algae of the Bermudas. 15. Dichotomaria huismanii (Galaxauraceae, Rhodophyta), a new species in the D. marginata complex from the western Atlantic
- First report of the Hawaiian genus Newhousia (Dictyotales, Phaeophyceae) from Madang, Papua New Guinea and description of the new species N. yhaga sp. nov.
- No sex-related dispersal limitation in a dioecious, oceanic long-distance traveller: the bull kelp Durvillaea antarctica
- Infection process of Ceramium rubrum (Rhodophyta, Ceramiales) on the agarophyte Gracilaria chilensis (Rhodophyta, Gracilariales)
- Repetitive harvesting of Macrocystis pyrifera (Phaeophyceae) and its effects on chemical constituents of economic value
- Short communications
- On two new records of rare Cystoseira taxa (Fucales, Phaeophyceae) from Greece (Eastern Mediterranean)
- New record of the pantropical seagrass Halophila decipiens Ostenfeld (Hydrocharitaceae) from the Andaman and Nicobar Islands, India
Articles in the same Issue
- Frontmatter
- In this issue
- Research articles
- Genetic variation within and among asexual populations of Porphyra umbilicalis Kützing (Bangiales, Rhodophyta) in the Gulf of Maine, USA
- Notes on the marine algae of the Bermudas. 15. Dichotomaria huismanii (Galaxauraceae, Rhodophyta), a new species in the D. marginata complex from the western Atlantic
- First report of the Hawaiian genus Newhousia (Dictyotales, Phaeophyceae) from Madang, Papua New Guinea and description of the new species N. yhaga sp. nov.
- No sex-related dispersal limitation in a dioecious, oceanic long-distance traveller: the bull kelp Durvillaea antarctica
- Infection process of Ceramium rubrum (Rhodophyta, Ceramiales) on the agarophyte Gracilaria chilensis (Rhodophyta, Gracilariales)
- Repetitive harvesting of Macrocystis pyrifera (Phaeophyceae) and its effects on chemical constituents of economic value
- Short communications
- On two new records of rare Cystoseira taxa (Fucales, Phaeophyceae) from Greece (Eastern Mediterranean)
- New record of the pantropical seagrass Halophila decipiens Ostenfeld (Hydrocharitaceae) from the Andaman and Nicobar Islands, India
