Род Перец: Биология, Эволюция и Распространение

Genus of plants

Piper, the pepper plants or pepper vines, is an economically and ecologically important genus in the family Piperaceae. It contains about 1,000–2,000 species of shrubs, herbs, and lianas, many of which are dominant species in their native habitat. The diversification of this taxon is of interest to understanding the evolution of plants. Pepper plants belong to the magnoliids, which are angiosperms but neither monocots nor eudicots. Their family, Piperaceae, is most closely related to the lizardtail family (Saururaceae), which in fact generally look like smaller, more delicate and amphibious pepper plants. Both families have characteristic tail shaped inflorescences covered in tiny flowers. A somewhat less close relative is the pipevine family (Aristolochiaceae). A well known and very close relative – being also part of the Piperaceae – are the radiator plants of the genus Peperomia. The scientific name Piper and the common name "pepper" are derived from the Sanskrit term pippali, denoting the long pepper (P. longum).

The earliest fossil of Piper is of †Piper margaritae from the Late Cretaceous (Maastrichtian) of Colombia. P. margaritae appears to be nested within the clade Schilleria, indicating extensive Cretaceous diversification of Piper into the multiple extant clades, coinciding with the final breakup of Gondwana. This contrasts with previous theories assuming a younger radiation of the genus. An earlier potential record is of †Piper arcuatile from the Cenomanian to Santonian Kaltag Formation of Yukon, although this affinity to Piper is not entirely reliable.

Piper species have a pantropical distribution, and are most commonly found in the understory of lowland tropical forests, but can also occur in clearings and in higher elevation life zones such as cloud forests; one species – the Japanese Pepper (P. kadsura) from southern Japan and southernmost Korea – is subtropical and can tolerate light winter frost. Peppers are often dominant species where they are found. Most Piper species are either herbaceous or vines; some grow as shrubs or almost as small trees. A few species, commonly called "ant pipers" (e. g. Piper cenocladum), live in a mutualism with ants. The fruit of the Piper plant, called a peppercorn when it is round and pea sized, as is usual, is distributed in the wild mainly by birds, but small fruit eating mammals – e. g. bats of the genus Carollia – are also important. Despite the high content of chemicals that are noxious to herbivores, some have evolved the ability to withstand the chemical defences of pepper plants, for example the sematurine moth Homidiana subpicta or some flea beetles of the genus Lanka. The latter can be significant pests to pepper growers.

Many pepper plants make good ornamentals for gardens in subtropical or warmer regions. Pepper vines can be used much as ivy in temperate climates, while other species, like lacquered pepper (P. magnificum) grow as sizeable, compact and attractive shrubs with tough and shiny leaves. Smaller species, like Celebes pepper (P. ornatum) with its finely patterned leaves, are also suitable as indoor pot plants. Unsustainable logging of tropical primary forests is threatening a number of peppers. The extent of the effect of such wholesale habitat destruction on the genus is unknown, but in the forests of Ecuador – the only larger region for which comprehensive data exists – more than a dozen species are known to be on the brink of extinction. On the other hand, other Piper species (e. g. spiked pepper, P. aduncum) have been widely distributed as a result of human activity and are a major invasive species in certain areas. The most significant human use of Piper is not for its looks however, but ultimately for the wide range of powerful secondary compounds found particularly in the fruits.

Cubeb (P. cubeba) has been used in folk medicine and herbalism as well as, particularly in the early 20th century, as a cigarette flavoring. P. darienense is used medically by the Kuna people of the Panama Colombia border region, and elsewhere it is used to intoxicate fish which then can be easily caught. Spiked pepper, often called matico appears to have strong disinfectant and antibiotic properties. Black pepper (P. nigrum) essential oil is sometimes used in herbalism, and long pepper (P. longum) is similarly employed in Ayurveda, where it was an ingredient of Triphala Guggulu and (together with black pepper) of Trikatu pills, used for rasayana (rejuvenating and detoxifying) purposes. One Piper species has gained large scale use as a stimulant. Betel (P. betle) leaves are used to wrap betel palm nut slices; its sap helps release the stimulating effect of these "cookies" which are widely known as pan in India. Conversely, another Piper species, kava (P. methysticum), is used for its depressant and euphoriant effects. In the Pacific region, where it has been widely spread as a canoe plant, kava is used to produce a calming and socializing drink somewhat similar to alcohol and benzodiazepines but without many of the negative side effects and less of an addiction risk. It has also become popular elsewhere in recent decades, and is used as a medical plant. However, pills that contain parts of the whole plant have occasionally shown a strong hepatotoxic effect, which has led to the banning of kava in many countries. On the other hand, the traditional preparation of the root as a calming drink appears to pose little, if any, such hazard.

The genus contains species suitable for studying natural history, molecular biology, natural products chemistry, community ecology, and evolutionary biology. Piper is a model genus for research in ecology and evolutionary biology. The diversity and ecological importance of the genus makes it a strong candidate for ecological and evolutionary studies. Most research has focused on the economically important species P. nigrum (black pepper), P. methysticum (kava), and P. betle (betel). A recent study based on DNA sequence analysis suggest that P. nigrum originated in the Western Ghats hot spot in India. The obligate and facultative ant mutualists found in some Piper species have a strong influence on their biology, making them ideal systems for research on the evolution of symbioses and the effect of mutualisms on biotic communities. Important secondary metabolites found in pepper plants are piperine and chavicine, which were first isolated from Black Pepper, and reported to have antibiotic activities. Preliminary research reports has shown that piperine has an antibacterial activity against various bacteria such as S. aureus, Streptococcus mutans, and gastric cancer pathogen Helicobacter pylori and decreased H. pylori toxin entry to gastric epithelial cells. The piperidine functional group is named after the former, and piperazine (which is not found in P. nigrum in noticeable quantities) was in turn named after piperidine. The significant secondary metabolites of kava are kavalactones and flavokawains. Pipermethystine is suspected to be the main hepatotoxic compound in this plant's stems and leaves.

Studies have been done to determine the effectiveness of piper leaves to repel different types of insects. Capuchin monkeys have been recorded by BBC Earth rubbing the piper leaves on them to repel insects.

The largest number of Piper species are found in the Americas (about 700 species), with about 300 species from Southern Asia. There are smaller groups of species from the South Pacific (about 40 species) and Africa (about 15 species). The American, Asian, and South Pacific groups each appear to be monophyletic; the affinity of the African species is unclear. Some species are sometimes segregated into the genera Pothomorphe, Macropiper, Ottonia, Arctottonia, Sarcorhachis, Trianaeopiper, and Zippelia, but other sources keep them in Piper. The species called "Piper aggregatum" and "P. fasciculatum" are actually Lacistema aggregatum, a plant from the family Lacistemataceae.