Plietesials

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Plietesials are plants that grow for a number of years, flower gregariously (synchronously), set seed and then die. The length of the cycle can vary between 8 and 16 years. For example, the neelakurinji plant flowers every 12 years and bloomed as expected in 2006 in the Munnar region of Kerala, India.

Contents

Certain species of unrelated families of flowering plants (including Poaceae, Arecaceae, Scrophulariaceae, Fabaceae, Apocynaceae, and Acanthaceae) are plietesial. The term plietesial has been used in reference to perennial monocarpic plants "of the kind most often met with in the Strobilanthinae" (a subtribe of Acanthaceae containing Strobilanthes and allied genera) that usually grow gregariously, flower simultaneously following a long interval, set seed, and die. Other commonly used expressions or terms describing a plietesial life history include gregarious flowering, mast seeding, and supra-annual synchronized semelparity (semelparity = monocarpy). [1] It is not clear why gregarious flowering after long vegetative intervals would be associated with death after flowering, although both are associated with higher reproductive outputs. [2]

Description

A good description of this natural history aspect of a plant's life cycle can be found in the following report:

A plietesial life history has long been noted for certain species among unrelated families of flowering plants including Poaceae, Arecaceae, Scrophulariaceae, Fabaceae, Apocynaceae, and Acanthaceae. [3] Bremekamp [4] used the term plietesial in reference to perennial monocarpic plants "of the kind most often met with in the Strobilanthinae" (a subtribe of Acanthaceae containing Strobilanthes and allied genera) that usually grow gregariously, flower simultaneously following an interval of several years, set seed, and die. A similar life history is especially well known and documented among certain bamboos. [5] In plietesials, the seed crop typically germinates simultaneously shortly following the mass death of the parental plants and initiates a new cycle with the same periodicity. [6] Other commonly used expressions that apply to part or all of the plietesial life history include: gregarious flowering, mast seeding, and supra-annual synchronized semelparity (semelparity = monocarpy). There is considerable variation in life history for Strobilanthes. [7] Most known plietesial Strobilanthes take between 10 and 15 years (usually 12; although reports of 5 to 9 year cycles also have been made [8] ) to flower gregariously, set seed, and die. The flowering periodicity in all individuals is rarely 100%, with the result that flowering of rare individuals in non-mass-flowering years is not uncommon. In some species, mass flowering occurs over a wide area on a species-specific cycle; in other species, populations in different regions follow their own cycles. Some species flower gregariously in certain years but do not die following the mass flowering, and are therefore not plietesial. At least one species exhibits different flowering patterns in different portions of its range. The perennial Strobilanthes wallichii flowers annually in the eastern Himalayan portion of its range and plietesially in the western Himalayan portion (Wood 1994). Literature reports of life history for some taxa are ambiguous. For example, Robinson (1935) noted a 12 year plietesial cycle for S. consanguineus C.B. Clarke whereas Bowden (1950) indicated that this species flowers every year. Such discrepancies likely result either from misidentifications of or life history variations within taxa.

Daniel, Thomas F., Synchronous flowering and monocarpy suggest plietesial life history for neotropical Stenostephanus chiapensis(Acanthaceae). PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES. Fourth Series. Volume 57, No. 38, pp. 1011–1018, 1 fig. December 28, 2006

See also

Related Research Articles

Acanthaceae Family of flowering plants comprising the acanthus

Acanthaceae is a family of dicotyledonous flowering plants containing almost 250 genera and about 2500 species. Most are tropical herbs, shrubs, or twining vines; some are epiphytes. Only a few species are distributed in temperate regions. The four main centres of distribution are Indonesia and Malaysia, Africa, Brazil, and Central America. Representatives of the family can be found in nearly every habitat, including dense or open forests, scrublands, wet fields and valleys, sea coast and marine areas, swamps, and mangrove forests.

<i>Strobilanthes</i> Genus of flowering plants in the acanthus family

Strobilanthes is a genus of about 350 species of flowering plants in the family Acanthaceae, mostly native to tropical Asia and Madagascar, but with a few species extending north into temperate regions of Asia. Many species are cultivated for their two-lipped, hooded flowers in shades of blue, pink, white and purple. Most are frost-tender and require protection in frost-prone areas.

<i>Ficus citrifolia</i> Species of fig native to the Americas

Ficus citrifolia, also known as the shortleaf fig, giant bearded fig, Jagüey, wild banyantree and Wimba tree, is a species of banyan native to southern Florida, the Caribbean, Mexico, Central America, and northern South America south to Paraguay. It is distinguished from the closely related Florida strangler fig mainly by the finer veining in the leaves.

Monocarpic plants are those that flower, set seeds and then die.

Purple-throated mountaingem Species of bird

The purple-throated mountaingem is a hummingbird that breeds in the mountains of southern Nicaragua, northern Costa Rica and western Panama. This bird inhabits forested areas in hilly terrain, and is found at altitudes from 800 to 2,500 m.

<i>Strobilanthes kunthiana</i>

Strobilanthes kunthiana, kurinji or neelakurinji, is a shrub that is found in the shola forests of the Western Ghats in South India. Nilgiri Hills, which literally means the blue mountains, got their name from the purplish blue flowers of Neelakurinji that blossoms only once in 12 years. Of all long interval bloomers Strobilanthes kunthiana is the most rigorously demonstrated, with documented bloomings in 1838, 1850, 1862, 1874, 1886, 1898, 1910, 1922, 1934, 1946, 1958, 1970, 1982, 1994, 2006 and 2018, these have no match to Solar cycles.

Bamboo blossom

Bamboo blossom is a natural phenomenon in which the bamboos in a location blossom and become hung with bamboo seeds. This is commonly found in China, Myanmar and India.

Blue-winged parrotlet

The blue-winged parrotlet is a species of parrot in the family Psittacidae. It is the nominate species.

Predator satiation

Predator satiation is an anti-predator adaptation in which prey briefly occur at high population densities, reducing the probability of an individual organism being eaten. When predators are flooded with potential prey, they can consume only a certain amount, so by occurring at high densities prey benefit from a safety in numbers effect. This strategy has evolved in a diverse range of prey, including notably many species of plants, insects, and fish. Predator satiation can be considered a type of refuge from predators.

<i>Oxytenanthera</i>

Oxytenanthera is a genus of African bamboo Bamboos are members of the grass family Poaceae.

Semelparity and iteroparity are two contrasting reproductive strategies available to living organisms. A species is considered semelparous if it is characterized by a single reproductive episode before death, and iteroparous if it is characterized by multiple reproductive cycles over the course of its lifetime. Some botanists use the parallel terms monocarpy and polycarpy.

<i>Tachigali versicolor</i>

Tachigali versicolor or the suicide tree is a species of tree found from Costa Rica to western Colombia. It is monocarpic, flowering only once before dying, which gives rise to its common name of the "suicide tree".

<i>Strobilanthes callosa</i> Species of plant

Strobilanthes callosa Nees (Synonym: Carvia callosa Bremek) is a shrub found mainly in the low hills of the western ghats all along the west coast of India. Its standardized Hindi language name is maruadona (मरुआदोना) by which it is called in the state of Madhya Pradesh where it is also found. In the state of Maharashtra in the Marathi language and other local dialects and in the neighboring state of Karnataka the shrub is locally known as karvi, sometimes spelled in English as karvy.

<i>Isoglossa woodii</i>

Isoglossa woodii, commonly known as buckweed, is a monocarpic shrub of the family Acanthaceae, growing up to 4 m tall. It grows in colonies in coastal forest areas of KwaZulu-Natal and marginally into Eastern Cape, South Africa.

<i>Frasera caroliniensis</i>

Frasera caroliniensis, commonly known as American columbo or yellow gentian, is a herbaceous perennial of the gentian family Gentianaceae found in the deciduous forest of Southern Ontario and throughout the eastern and southeastern United States. It was previously known as Swertia caroliniensis.

<i>Fargesia murielae</i>

Fargesia murielae, the umbrella bamboo, is a species of flowering plant in the family Poaceae. It is a large, clump-forming evergreen bamboo, closely resembling Fargesia nitida in the same genus, but with yellow canes.

<i>Trichanthera</i>

Trichanthera is a monotypic genus of flowering plants in the acanthus family containing the single species Trichanthera gigantea, which is known by many common names, including madre de agua, suiban, cenicero, tuno, naranjillo, and palo de agua. It is native to Central America and northern South America. It has also been introduced to other tropical regions such as Vietnam, Cambodia, and the Philippines.

Strobilanthes japonica is a flowering herbaceous perennial plant from Asia, one of around 350 plants of the genus Strobilanthes. The 20–50 cm ornamental plant is cultivated in Japan and China, and blooms in autumn with 1.5 cm purple to white funnel-shaped flowers.

Synchronus flowering, also called mast flowering or gregarious flowering, is when plants growing together all flower at the same time. Plietesials exhibit synchronous flowering.

Pachystrobilus is a genus of flowering plants in the family Acanthaceae and the tribe Ruellieae; it is found in south-east Asia. The genus contains a single species, Pachystrobilus involucratus. The Catalogue of Life lists this species under its synonym Strobilanthes involucratus, with a subspecies S. i. tjibodensis.

References

  1. Daniel, Thomas F. 2006. Synchronous Flowering and Monocarpy Suggest Plietesial Life History forNeotropical Stenostephanus chiapensis(Acanthaceae). PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES. Fourth Series. Volume 57, No. 38, pp. 1011–1018, 1 fig. December 28, 2006
  2. Young, Truman P.; Carol K. Augspurger (1991). "Ecology and evolution of long-lived semelparous plants". Trends in Ecology and Evolution. 6: 285–289. doi:10.1016/0169-5347(91)90006-J. PMID   21232483.
  3. (e.g., Fuller 1925; van Steenis 1942; Janzen 1976; Young and Augspurger 1991)
  4. (1944:20)
  5. (see Janzen 1976)
  6. (e.g., van Stennis 1978)
  7. Bremekamp (1944); also: Wood (1994) provided an insightful summary of mass-flowering and the various forms of this phenomenon known in the genus.
  8. e.g., van Steenis 1972