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Citrus Ryukyuensis
''Citrus ryukyuensis'', also known as the tanibuta (), is a newly characterized wild citrus species native to the Ryukyus and adjacent islands, most closely related to the mainland mandarin orange, ''C. reticulata''. As with other citrus, it is a member of the Rutaceae family. The Ryukyu and mainland species have diverged for more than 2 million years, and unlike the mainland mandarin, the Ryukyu mandarin reproduces sexually. Its hybridization with the mainland species has given rise to the unique mandarin hybrids of the islands. Discovery and characterization Previous genetic studies that characterized the mandarin oranges of the Asian mainland left unexplained the unusual genetic characteristics of those from Japan and nearby islands. A followup study designed at filling this gap in understanding produced an unexpected result, the identification of a pure wild species of mandarin, the hybridization of which with the mainland species has given rise to multiple distinct mandari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Citrus
''Citrus'' is a genus of flowering trees and shrubs in the family Rutaceae. Plants in the genus produce citrus fruits, including important crops such as oranges, mandarins, lemons, grapefruits, pomelos, and limes. ''Citrus'' is native to South Asia, East Asia, Southeast Asia, Melanesia, and Australia. Indigenous people in these areas have used and domesticated various species since ancient times. Its cultivation first spread into Micronesia and Polynesia through the Austronesian expansion (–1500 BCE). Later, it was spread to the Middle East and the Mediterranean () via the incense trade route, and from Europe to the Americas. Renowned for their highly fragrant aromas and complex flavor, citrus are among the most popular fruits in cultivation. With a propensity to hybridize between species, making their taxonomy complicated, there are numerous varieties encompassing a wide range of appearance and fruit flavors. Evolution Evolutionary history The large cit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Introgression
Introgression, also known as introgressive hybridization, in genetics is the transfer of genetic material from one species into the gene pool of another by the repeated backcrossing of an interspecific hybrid with one of its parent species. Introgression is a long-term process, even when artificial; it may take many hybrid generations before significant backcrossing occurs. This process is distinct from most forms of gene flow in that it occurs between two populations of different species, rather than two populations of the same species. Introgression also differs from simple Hybridization (biology), hybridization. Simple hybridization results in a relatively even mixture; gene and allele frequencies in the first generation will be a uniform mix of two parental species, such as that observed in mules. Introgression, on the other hand, results in a complex, highly variable mixture of genes, and may only involve a minimal percentage of the donor genome. Definition Introgression or i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bitter Orange
The bitter orange, sour orange, Seville orange, bigarade orange, or marmalade orange is the hybrid citrus tree species ''Citrus'' × ''aurantium'', and its fruit. It is native to Southeast Asia and has been spread by humans to many parts of the world. It is a cross between the pomelo, '' Citrus maxima'', and the wild type mandarin orange, '' Citrus reticulata''. The bitter orange is used to make essential oil, used in foods, drinks, and pharmaceuticals. The Seville orange is prized for making British orange marmalade. Definition In some proposed systems, the species ''Citrus'' × ''aurantium'' includes not only the bitter orange proper, but all other hybrids between the pomelo and the wild type mandarin, namely the sweet orange, the grapefruit, and all cultivated mandarins. p. 69–70 This article only deals with the bitter orange proper. History The bitter orange, like many cultivated ''Citrus'' species, is a hybrid, in its case of the wild mandarin and pomel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cam Sành
' () or King orange (''Citrus reticulata'' × ''sinensis'') is a citrus hybrid originating in Vietnam. ' is Vietnamese language, Vietnamese for "terracotta orange", although the fruit is more akin to a mandarin orange, mandarin or tangerine. The fruit may be easily recognized by its thick skin, which is typically bright green, although the skin may also be partly green and partly orange, or entirely orange. Its flesh is orange, dark and sweet. This is the most popular orange variety in Vietnam and Cambodia. Classification This tree is referred to as the "King Tangor" or "King Mandarin orange, Mandarin" in most horticultural literature. Budwood for grafting is available through the University of California Citrus Clonal Protection Program. One notable difference is that in temperate climates the fruit will turn a bright orange in response to colder temperatures when the fruits ripen. It is one among many citrus fruits from the region. These include the closely related yellow ''ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Citrus Depressa
''Citrus depressa'' (''Citrus'' × ''depressa'', formerly ''C. pectinifera'', , or , , in English sometimes called shiikuwasha, shequasar, Taiwan tangerine, Okinawa lime, flat lemon, hirami lemon, or thin-skinned flat lemon, is a small citrus fruit often harvested and used when green, rich in flavonoids and native to East Asia (Taiwan and Okinawa Islands, Japan). Very sour, it is often used like lemon or lime to garnish dishes, but is also used to make jams, or a yellow juice, which can be thinned or sweetened. Its name is occasionally translated into English as calamansi (calamondin, ''Citrus'' × ''microcarpa''), but this is a different fruit. ''Shiikwaasa'' is primarily produced in southwest Japan, in the northern region of the main Okinawa island, along with another indigenous Japanese citrus, the tachibana orange (''Citrus tachibana''). The two are not the only species of citrus currently growing on the island, as there have been foreign species introduced and have s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sun Chu Sha Mandarin
The Sun is the star at the centre of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies. It is by far the most important source of energy for life on Earth. The Sun has been an object of veneration in many cultures. It has been a central subject for astronomical research since antiquity. The Sun orbits the Galactic Center at a distance of 24,000 to 28,000 light-years. Its distance from Earth defines the astronomical unit, which is about or about 8 light-minutes. Its diameter is about (), 109 times that of Earth. The Sun's mass is about 330,000 times that of Earth, making up about 99.86% of the total mass of the Solar System. The mass of outer layer of the Sun's atmosphere, its ''photosphere'', consists mostly of hydrogen (~73%) and helium (~25%), with much smaller ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Okinawa Prefecture
is the southernmost and westernmost prefecture of Japan. It consists of three main island groups—the Okinawa Islands, the Sakishima Islands, and the Daitō Islands—spread across a maritime zone approximately 1,000 kilometers east to west and 400 kilometers north to south. Despite a modest land area of 2,281 km² (880 sq mi), Okinawa’s territorial extent over surrounding seas makes its total area nearly half the combined size of Honshu, Shikoku, and Kyushu. Of its 160 Island, islands, 49 are inhabited. The largest and most populous island is Okinawa Island, which hosts the capital city, Naha, as well as major urban centers such as Okinawa (city), Okinawa, Uruma, and Urasoe, Okinawa, Urasoe. The prefecture has a subtropical climate, characterized by warm temperatures and high rainfall throughout the year. People from the Ryukyu Islands, Nansei Islands, including Okinawa Island, Okinawa, the Sakishima Islands, and parts of Kagoshima Prefecture, are often collectively referred ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tachibana Orange
The tachibana orange (''Citrus'' × ''tachibana'', or ''Citrus reticulata'' subsp. ''tachibana'') is a variety of mandarin orange, a citrus fruit. They grow wild in the forests of Japan and are referred to in the poetry of the early Japanese and Ryukyu Islands kingdoms. and Supplement The Tanaka System assigns them their own species, while the Swingle System places them in the same species with other mandarin oranges. Genomic analysis has shown tachibana oranges to be a constellation of distinct natural F1 hybrids that cross the pure Ryukyu Island mandarin '' C. ryukyuensis'' with mainland Asian '' C. reticulata'' that was itself a hybrid of northern and southern subspecies, but also contained some prior Ryukyu mandarin introgression. They lack the pomelo introgression found in the closely related domesticated mandarin oranges of mainland Asia, though they have a mainland-mandarin-derived transposable element insertion that causes them to reproduce asexually by apomixis, unlike ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pomelo
The pomelo ( ; or pummelo, ''Citrus maxima''), also known as a shaddock, is the largest citrus fruit. It is an ancestor of several cultivated citrus species, including the bitter orange and the grapefruit. It is a natural, non-hybrid citrus fruit, native to Southeast Asia. Similar in taste to a sweet grapefruit, the pomelo is commonly eaten and used for festive occasions throughout Southeast and East Asia. As with the grapefruit, phytochemicals in the pomelo have the potential for drug interactions. Description The pomelo tree may be tall, with a trunk, often rather crooked, that is thick, and low-hanging, irregular branches. The petioles (leaf stalks) are distinctly winged. The leaves are alternate, ovate or elliptic in shape and long; they are leathery and dull green above, hairy beneath. The flowers – single or in clusters – are fragrant and yellow-white in color. The fruit is large, in diameter, round or somewhat pear-shaped. Its weight varies by cultivar fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oceanic Dispersal
Oceanic dispersal is a type of biological dispersal that occurs when Terrestrial animal, terrestrial organisms transfer from one land mass to another by way of a sea crossing. Island hopping is the crossing of an ocean by a series of shorter journeys between islands, as opposed to a single journey directly to the destination. Often this occurs via large rafts of floating vegetation such as are sometimes seen floating down major rivers in the tropics and washing out to sea, occasionally with animals trapped on them. Dispersal via such a raft is sometimes referred to as a rafting event. Colonization of land masses by plants can also occur via long-distance oceanic dispersal of floating seeds. History Rafting has played an important role in the colonization of isolated land masses by mammals. Prominent examples include Madagascar, which has been isolated for ~120 million years (Year#SI prefix multipliers, Ma), and South America, which was isolated for much of the Cenozoic. Both lan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ryukyu Islands
The , also known as the or the , are a chain of Japanese islands that stretch southwest from Kyushu to Geography of Taiwan, Taiwan: the Ryukyu Islands are divided into the Satsunan Islands (Ōsumi Islands, Ōsumi, Tokara Islands, Tokara and Amami Islands, Amami) and Okinawa Prefecture (Daitō Islands, Daitō, Miyako Islands, Miyako, Yaeyama Islands, Yaeyama, Senkaku Islands, Senkaku, Okinawa Islands, Okinawa, Sakishima Islands (further divided into the Miyako Islands, Miyako and Yaeyama Islands), and Yonaguni as the westernmost). The larger ones are mostly volcanic islands and the smaller mostly coral island, coral. The largest is Okinawa Island. The climate of the islands ranges from humid subtropical climate (Köppen climate classification ''Cfa'') in the north to tropical rainforest climate (Köppen climate classification ''Af'') in the south. Precipitation is very high and is affected by the rainy season and typhoons. Except the outlying Daitō Islands, the island chain ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apomixis
In botany, apomixis is asexual development of seed or embryo without fertilization. However, other definitions include replacement of the seed by a plantlet or replacement of the flower by bulbils. Apomictically produced offspring are genetically identical to the parent plant, except in nonrecurrent apomixis. Its etymology is Greek for "away from" + "mixing". Normal asexual reproduction of plants, such as propagation from cuttings or leaves, has never been considered to be apomixis. In contrast to parthenocarpy, which involves seedless fruit formation without fertilization, apomictic fruits have viable seeds containing a proper embryo, with asexual origin. In flowering plants, the term "apomixis" is used in a restricted sense to mean agamospermy, i.e. clonal reproduction through seeds. Although agamospermy could theoretically occur in gymnosperms, it appears to be absent in that group. Apogamy is a related term that has had various meanings over time. In plants with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
