Genlisea margaretae

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Genlisea margaretae
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Lentibulariaceae
Genus: Genlisea
Subgenus: Genlisea subg. Genlisea
Species:
G. margaretae
Binomial name
Genlisea margaretae
Hutch. (1946)
Synonyms [1]

Genlisea recurva Bosser (1959)

Genlisea margaretae is a carnivorous species in the genus Genlisea (family Lentibulariaceae) native to areas of Madagascar, Tanzania, and Zambia. [1] It has pale bundles of root-like organs up to about 20 cm long under ground that attract, trap, and digest protozoans. These organs are subterranean leaves, which lack chlorophyll. It had been known to possess the smallest known genome of any flowering plant as of 2006, but was later surpassed by the related species Genlisea tuberosa .

Characteristics

Genlisea margaretae is a perennial herb that forms small, compact rosettes composed of nearly linear leaves about 2 mm wide. Leaves are typically 5–50 mm in length, but most of that length, including the petiole, is hidden beneath the soil. It has no true roots and instead has highly modified subterranean leaves that act as the carnivorous trapping mechanism. [2]

The inflorescences, which can grow to be 20–60 cm tall, emerge from the center of the rosette and produce mauve or violet-colored flowers. Each inflorescence can produce more than 10 flowers on a congested raceme. The upper part of the inflorescences is densely covered with glandular trichomes while the lower part has fewer trichomes and is often glabrous. Individual flowers have rounded upper lips on the corolla instead of being lobed and a relatively straight spur. [2]

The genomes of several species in the genus Genlisea were studied in 2006 along with other members of the Lentibulariaceae family. According to the study, prior to its publication the smallest known angiosperm (flowering plant) genome was that of Arabidopsis thaliana at 157 Megabase pairs (Mbp). With a diploid chromosome number of around 40 (2n = ca. 40), G. margaretae held the distinction of having the smallest known angiosperm genome size at 63.4 Mbp, just 0.2 Mbp lower than that of Genlisea aurea . Further research in 2014 found that a related species, Genlisea tuberosa has a smaller genome size at around 61 Mbp. [3] The smallest individual chromatids from mitotic anaphase are just 2.1 Mbp and therefore have a size smaller than some bacterial chromosomes, such as the approximate 4 Mbp of Escherichia coli . G. margaretae and G. aurea also both appear to be polyploid species with the unusual circumstances of having a high chromosome number with extremely small chromosomes. Other species in the genus Genlisea and the family Lentibulariaceae have much lower chromosome numbers and larger genome sizes, affirming that one characteristic of this botanic family is rapid molecular evolution. G. margaretae in particular may be helpful in research aimed at understanding the mechanisms behind genome downsizing. [4]

At least one natural hybrid among the African species that involves G. margaretae has been described. Genlisea margaretae × glandulosissima is a product of G. margaretae and G. glandulosissima . [5]

Distribution and habitat

Genlisea margaretae is one of the several Genlisea species native to Southeast Africa. It has been discovered in Tanzania and Zambia and is the only Genlisea species reported to exist in Madagascar. [2] Its typical oligotrophous habitat includes inselbergs, ferricretes, and swamps. [5] [6]

Carnivory

Genlisea margaretae, like all Genlisea species, is a carnivorous plant that attracts, traps, kills, and digests prey, which are typically protozoans. Evidence of this behavior had been postulated ever since Charles Darwin's time and has mostly relied on circumstantial findings of the occasional dead aquatic invertebrate in the utricle (digestion chamber). In 1975, however, British botanist Yolande Heslop-Harrison discovered digestive enzyme activity in G. africana . [7] Later, in 1998, Wilhelm Barthlott and his colleagues concluded through experimentation that Genlisea attracts prey chemotactically, traps them in the corkscrew "lobster pot" trap, digests them with enzymes produced by the plant, and then absorbs the nutrients. This study represented the first conclusive evidence that G. margaretae was carnivorous. [8]

Cultivation

According to Barry Rice in his 2006 book on carnivorous plants, G. margaretae is an easy terrestrial species to grow. Leaf and trap cuttings can easily produce new plant clones. G. margaretae requires high humidity and medium to bright lighting conditions with soil composition similar to that of other carnivorous plants, especially the terrestrial Utricularia species. [7]

Related Research Articles

<span class="mw-page-title-main">Droseraceae</span> Family of carnivorous flowering plants

Droseraceae is a family of carnivorous flowering plants, also known as the sundew family. It consists of approximately 180 species in three extant genera. Representatives of the Droseraceae are found on all continents except Antarctica.

<span class="mw-page-title-main">Lentibulariaceae</span> Family of carnivorous plants

Lentibulariaceae is a family of carnivorous plants containing three genera: Genlisea, the corkscrew plants; Pinguicula, the butterworts; and Utricularia, the bladderworts.

<i>Utricularia</i> Genus of carnivorous plants

Utricularia, commonly and collectively called the bladderworts, is a genus of carnivorous plants consisting of approximately 233 species. They occur in fresh water and wet soil as terrestrial or aquatic species across every continent except Antarctica. Utricularia are cultivated for their flowers, which are often compared with those of snapdragons and orchids, especially amongst carnivorous plant enthusiasts.

<i>Genlisea</i> Genus of carnivorous plants

Genlisea is a genus of carnivorous plants also known as corkscrew plants. The 30 or so species grow in wet terrestrial to semi-aquatic environments distributed throughout Africa and Central and South America. The plants use highly modified underground leaves to attract, trap and digest minute microfauna, particularly protozoans. Although suggested a century earlier by Charles Darwin, carnivory in the genus was not proven until 1998.

<i>Byblis</i> (plant) Genus of carnivorous plants

Byblis is a small genus of carnivorous plants, sometimes termed the rainbow plants for the attractive appearance of their mucilage-covered leaves in bright sunshine. Native to Australia and New Guinea, it is the only genus in the family Byblidaceae. The first species in the genus was described by the English botanist Richard Anthony Salisbury in 1808. Eight species are now recognised.

<i>Genlisea aurea</i> Species of carnivorous plant

Genlisea aurea is one of the largest carnivorous species in the genus Genlisea. It has pale bundles of root-like organs up to about 15 cm long under ground that attract, trap, and digest protozoans. These organs are subterranean leaves, which lack chlorophyll. G. aurea is endemic to Brazil, where it grows with several other species of Genlisea. It possesses an exceptionally small genome for a flowering plant.

<i>Utricularia gibba</i> Species of plant, Humped bladderwort

Utricularia gibba, commonly known as the humped bladderwort or floating bladderwort, is a small, mat-forming species of carnivorous aquatic bladderwort. It is found on all continents except Antarctica.

Philcoxia is a genus of seven rare plant species in the Plantaginaceae that are endemic to Brazil and resemble terrestrial species of the genus Utricularia. The genus, formally described in 2000, consists of the species P. bahiensis, P. goiasensis, P. minensis, P. tuberosa, P. rhizomatosa, P. maranhensis and P. courensis, each of the first three named for the Brazilian state to which it is endemic. The species are characterized by subterranean stems, peltate leaves at or below the soil surface, and five-lobed calyces. Their habitat has been reported as areas of white sand in the midst of cerrado vegetation at an elevation between 800 and 1450 m. Initial descriptions of the genus included suspicions that the plethora of stalked capitate glands on the upper surfaces of leaves was an indication that these species may be carnivorous. A study published in 2007 tested P. minensis for protease activity, a typical test for the carnivorous syndrome, and could detect none. Later studies detected other digestive enzymes such as phosphatases and qualitatively assessed prey digestion and nutrient uptake, suggesting that it is a true carnivorous plant. The genus epithet honors David Philcox (1926-2003), a botanist at Kew Gardens who worked extensively in tropical Scrophulariaceae.

Colura zoophaga is a species of epiphytic liverwort that is endemic to the African highlands, specifically parts of Kenya. It belongs to the genus Colura, which has been hypothesized to be carnivorous as early as 1893. It is a recently described species that was the subject of the first scientific study aimed at investigating the allegations of carnivory in liverworts.

<i>Utricularia inflata</i> Species of carnivorous plant

Utricularia inflata, commonly known as the swollen bladderwort, inflated bladderwort, or large floating bladderwort, is a large suspended aquatic carnivorous plant that belongs to the genus Utricularia. It is a perennial that is native to the southeastern coastal plains of the United States. It has often been confused with U. radiata, which is similar but smaller than U. inflata. Since 1980, U. inflata has been reported to exist in locations beyond its traditional range, such as the Adirondack Mountains in New York, southeastern Massachusetts, and in Washington State. Studies on the populations in the Adirondacks suggest that an introduction of U. inflata to a location where it naturalizes can lead to altered sediment chemistry by reducing the net primary productivity of native species. It is also listed by the state of Washington as a problematic species because of the dense mat-forming habit of this aquatic Utricularia. It is one of the few carnivorous plants that can be invasive.

<i>Utricularia <span style="font-style:normal;">subg.</span> Bivalvaria</i> Subgenus of carnivorous plants

Utricularia subg. Bivalvaria is a subgenus in the genus Utricularia. It was originally described by Wilhelm Sulpiz Kurz in 1874. In Peter Taylor's 1989 monograph on the genus, he reduced the subgenus to synonym under section Oligocista, a decision that was later reversed in the light of molecular phylogenetic studies and the subgenus was restored.

Utricularia sect. Enskide is a section in the genus Utricularia. The two species in this section are small to medium-sized terrestrial carnivorous plants native to Australia and New Guinea. Constantine Samuel Rafinesque originally described and published this section as a separate genus in his 1838 taxonomic treatment. Peter Taylor refined the section and placed it within subgenus Utricularia in his 1986 monograph of the genus. Later molecular data resulted in the revision of Taylor's treatment, reinstating subgenus Bivalvaria and placing this section within it.

<i>Utricularia <span style="font-style:normal;">sect.</span> Stomoisia</i> Group of carnivorous plants

Utricularia sect. Stomoisia is a section in the genus Utricularia. The two species in this section are small to medium-sized terrestrial carnivorous plants native to North, Central, and South America. Constantine Samuel Rafinesque originally described and published this section as a separate genus in his 1838 taxonomic treatment. Otto Kuntze reduced the genus to its current status as a section in the genus Utricularia in 1903. Peter Taylor later refined the section, placing it in subgenus Utricularia in his 1986 monograph of the genus, also bringing one of Rafinesque's other genera, Personula, into synonymy with the new section. Later molecular data resulted in the revision of Taylor's treatment, reinstating subgenus Bivalvaria and placing this section within it.

<i>Utricularia <span style="font-style:normal;">sect.</span> Nigrescentes</i> Group of carnivorous plants

Utricularia sect. Nigrescentes is a section in the genus Utricularia. The three species in this section are small terrestrial carnivorous plants native to tropical Africa, Asia, and Australia. Daniel Oliver originally validly described and published this section in 1859, but did not specify the rank used by the group. Sadashi Komiya revised the section in 1973. Peter Taylor, in his 1989 taxonomic monograph on the genus, placed this section within subgenus Utricularia. More recent phylogenetic data and revisions have reinstated subgenus Bivalvaria and have placed this section within it.

<i>Utricularia <span style="font-style:normal;">sect.</span> Aranella</i> Group of carnivorous plants

Utricularia sect. Aranella is a section in the genus Utricularia. The ten species in this section are small terrestrial carnivorous plants native to tropical South America with one species also extending into tropical Africa. John Hendley Barnhart originally described and published this section in 1913 as a separate genus, Aranella. Sadashi Komiya revised the genus Utricularia in a 1973 taxonomic review and placed Barnhart's genus at the rank of subgenus within Utricularia. Peter Taylor then published his taxonomic monograph of Utricularia in 1986 in which he reduced Komiya's subgenus to the rank of section, placing it within subgenus Utricularia. More recent phylogenetic data and revisions have reinstated subgenus Bivalvaria and have placed this section within it.

<i>Utricularia <span style="font-style:normal;">sect.</span> Oligocista</i> Group of carnivorous plants

Utricularia sect. Oligocista is the largest section in the genus Utricularia. The 42 species in this section are small to medium-sized terrestrial carnivorous plants native throughout the tropics, with six species in the Americas, ten in Africa, five in Australia, and the remainder in Asia, with 17 mostly native to peninsular India. Alphonse Pyrame de Candolle originally described and published this section in 1844. Peter Taylor published his taxonomic monograph of Utricularia in 1986, in which he placed this section within subgenus Utricularia. More recent phylogenetic data and revisions have reinstated subgenus Bivalvaria and have placed this section within it.

<span class="mw-page-title-main">Carnivorous plant</span> Plants that consume animals

Carnivorous plants are plants that derive some or most of their nutrients from trapping and consuming animals or protozoans, typically insects and other arthropods, and occasionally small mammals and birds. They still generate all of their energy from photosynthesis. They have adapted to grow in waterlogged sunny places where the soil is thin or poor in nutrients, especially nitrogen, such as acidic bogs. They can be found on all continents except Antarctica, as well as many Pacific islands. In 1875, Charles Darwin published Insectivorous Plants, the first treatise to recognize the significance of carnivory in plants, describing years of painstaking research.

<span class="mw-page-title-main">Wilhelm Barthlott</span> German botanist

Wilhelm Barthlott is a German botanist and biomimetic materials scientist. His official botanical author citation is Barthlott.

<i>Pinguicula</i> Genus of flowering plants in the family Lentibulariaceae

Pinguicula, commonly known as butterworts, is a genus of carnivorous flowering plants in the family Lentibulariaceae. They use sticky, glandular leaves to lure, trap, and digest insects in order to supplement the poor mineral nutrition they obtain from the environment. Of the roughly 80 currently known species, 13 are native to Europe, 9 to North America, and some to northern Asia. The largest number of species is in South and Central America.

Genlisea tuberosa is a carnivorous species in the genus Genlisea that is endemic to Brazil and found only in campos rupestres vegetation. Lacking any roots, it has unpigmented bundles of "rootlike" subterranean organs, technically leaves, which attract, trap, and digest protozoans. This species is unique in the genus in its formation of tubers. As of 2014, Genlisea tuberosa has the smallest known genome of any flowering plant, at 61 Mbp, or 61,000,000 base pairs.

References

  1. 1 2 Claudi-Magnussen, Glenn. (1982). "An Introduction to Genlisea" (PDF). (497  KiB)Carnivorous Plant Newsletter, 11(1):13-15.
  2. 1 2 3 Taylor, Peter. (1991). "The genus Genlisea" (PDF). (1.17  MiB)Carnivorous Plant Newsletter, 20(1): 20-26.
  3. Fleischmann A, Michael TP, Rivadavia F, Sousa A, Wang W, Temsch EM, Greilhuber J, Müller KF, Heubl G (2014). "Evolution of genome size and chromosome number in the carnivorous plant genus Genlisea (Lentibulariaceae), with a new estimate of the minimum genome size in angiosperms". Annals of Botany. 114 (8): 1651–1663. doi:10.1093/aob/mcu189. PMC   4649684 . PMID   25274549. Lock-green.svg
  4. Greilhuber J, Borsch T, Müller K, Worberg A, Porembski S, Barthlott W (2006). "Smallest angiosperm genomes found in Lentibulariaceae, with chromosomes of bacterial size". Plant Biology. 8 (6): 770–777. Bibcode:2006PlBio...8..770G. doi:10.1055/s-2006-924101. PMID   17203433.
  5. 1 2 Rice, Barry A. (2007). Old World Genlisea species. The Carnivorous Plant FAQ. Accessed 20 May 2007.
  6. Fischer E, Porembski S, Barthlott W (2000). "Revision of the genus Genlisea (Lentibulariaceae) in Africa and Madagascar with notes on ecology and phytogeography". Nordic Journal of Botany. 20 (3): 291–318. doi: 10.1111/j.1756-1051.2000.tb00746.x .
  7. 1 2 Rice, B.A. (2006). Growing Carnivorous Plants. Portland, Oregon: Timber Press.
  8. Barthlott W, Porembski S, Fischer E, Gemmel B (1998). "First protozoa-trapping plant found". Nature. 392 (6675): 447–8. Bibcode:1998Natur.392Q.447B. doi: 10.1038/33037 . PMID   9548248.