Ceratopteris richardii
Aquatic fern used as a model organism in biology.
Ceratopteris richardii is an aquatic fern, one of the few fern species adapted to living in water. It belongs to the genus *Ceratopteris*, which is one of just two genera in the subfamily Parkerioideae of the family Pteridaceae. For a time, it was considered part of the species *Ceratopteris thalictroides*.
This fern is particularly important in science because of a patented strain called "C-Fern," created in 1995 for research and teaching. C-Fern grows easily in a petri dish on agar, reaching sexual maturity in two to three weeks after spores are planted, at which point motile sperm can be seen. Over about six weeks, researchers can observe germination, sex determination, gametophyte development, fertilization, embryogenesis, organogenesis, and sporophyte growth—allowing a complete view of the homosporous fern life cycle in a short time. Because the plants are small, many can be grown together, giving larger sample sizes for experiments. After growing in dishes, C-Fern can be moved to soil, where it continues to grow and produce future generations for further study.
Ferns are studied much less than other plant groups, and a full genome sequence was long unavailable. But thanks to C-Fern, research on fern biology has increased, and *C. richardii* has become a model organism for studying topics like vascular plant cell walls, alternation of generations and related mutations, genetics, population dynamics, and the effects of mitotic disrupter herbicides. Even though spores are genetically identical, they can develop into either hermaphrodites or males, depending on the secretion of a pheromone called antheridiogen. This has been used to study plant pheromones and the chain of events leading to epigenetic changes in ferns. The ability to switch from bisexual to all-male spores may help promote outbreeding, offering an evolutionary advantage.
Using *C. richardii* in genetic research has helped scientists understand fern and plant evolution more broadly. In 2019, C-Fern became the first homosporous fern to have its genome partially assembled, serving as a reference genome for comparing other ferns. Additionally, *C. richardii* spores germinated in space in 1999 aboard shuttle mission STS-93, making it one of the few plants grown beyond Earth.
Quick Facts
- Taxon
- Ceratopteris richardii
Facts from the source article.
Lore & Background
Ceratopteris richardii was previously regarded as being part of the species Ceratopteris thalictroides. It is one of several genera of ferns adapted to an aquatic existence. The species gained prominence through the development of a patented strain called 'C-Fern' in 1995, which grows readily in a cell-culture dish on agar media, reaching sexual maturity within 2–3 weeks of spore inoculation, with motile sperm cells being visible at this time. Over about 6 weeks, germination, sex determination and development of gametophytes, fertilization, embryogenesis, organogenesis, and sporophyte growth can all be observed, allowing comprehensive study of the life cycle of homosporous ferns in a relatively short time period. Due to the small size of the plant, many specimens can be observed growing simultaneously, allowing for larger sample sizes in research studies. Following culture in dishes, it can be transplanted to a dirt substrate for further growth and subsequent generations.
Reader's Guide
Ceratopteris richardii, particularly through its patented 'C-Fern' strain, has become a significant model organism in biological research. Monilophytes are generally studied far less than other groups of plants, and a full genome sequence was not yet available, but due to the development of 'C-Fern', research into fern biology has been more prevalent. C. richardii has been used to study vascular plant cell walls, alternation of generations and associated mutations, genetics, population dynamics, and the effects of mitotic disrupter herbicides. Despite being genetically identical, inoculated spores can give rise to both hermaphrodites and male gametophytes depending on the secretion of antheridiogen; this phenomenon has been used to study plant pheromones and the cascade of events leading to epigenetic changes in ferns. The ability to switch from bisexual to all male spores may provide an evolutionary advantage by promoting outbreeding. In 2019, 'C-Fern' became the first homosporous fern to have its genome partially assembled, acting as a reference genome for other ferns. Additionally, C. richardii spores germinated in space in 1999 on shuttle mission STS-93, making them one of the few plants to be grown in space.
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