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Hybrid Cross

Mechanisms for the Promotion of historical survival through hybridization Castaño

Historically, chestnuts have been through times as long as food products and wood in European and Eastern cultures. Chestnuts saved from the demise of some civilizations during famines, wars and natural disasters. Native American chestnuts offers many promises and comfort to the early settlers, but the plague that was introduced by importing nursery stock from Asia, American chestnut trees were nearly eliminated. Some brown colonies survived in isolated places and thanks to advances in plant breeding chestnut was restored throughout the country. The original stands of American chestnuts were far superior to any other kind in the world in terms of sweet taste large quantities of wood that was produced. Foreign types of nuts, such as Chinese, Japanese and European implants have been used to back immunity qualities in the historic genetic code contained in the core of tasty American chestnut.

One of the earliest references to the American chestnut, "Castanea dentata," was given in John and William Bartram seed and nursery catalog, catalog first U.S. nursery that was published in Philadelphia, PA in 1783. The Bartram family, famous American explorers and botanists, were close friends of Benjamin Franklin and the U.S. George Washington and Thomas Jefferson Presidents. The supplied Bartrams American chestnut trees to the gardens at Independence Hall in Philadelphia and the staff of the gardens at Mount Vernon George Washington and Thomas Jefferson at Monticello, Virginia President Jefferson was an avid plant collector and spent endless hours in search of return that were commercially suitable vegetable crops for farmers U.S.. President Jefferson attempted and succeeded in crossing and hybridization of different collections of Spanish and European species of chestnut, 'Castanea sativa. He also performed crosses of hybrid crosses forming chestnut European chestnut, 'Castanea sativa' and the American chestnut, 'Castanea dentata.

Thomas Jefferson is documented that European chestnuts have personally grafted onto American rootstock, however, it is unclear why he did it, and American chestnuts were the most desirable and tested better than the European chestnut.

In his book, Travels, William Bartram never mentions any meeting or observation of the American chestnut 'Castanea dentata, "despite his extensive exploration of the southeastern U.S., where the trees were growing substantially in large numbers in their natural habitat. The mystery created by Bartram omitting references to this significant inhabitant of forests in America is a puzzle that may never responded. Maps locate famous Bartram Philadelphia, Pa. arboretum and garden still actively used today as a tourist attraction documented the presence chestnut in the garden border goliaths.

Nuts legendary American chestnut harvest had a superior taste and production capacity to Throughout the European chestnut. These nuts were gathered and stored in the shade and coolness of the fall, so that the core of starch could develop its tasty sweetness. Shelled nuts and could be eaten fresh, or they could be roasted over hot coals for flavor. A common sight on the streets of New York or Philadelphia was street vendors moving stoves to roast fresh chestnuts in cast iron pots to offer for sale to pedestrians. The bumper crops of nuts in the woods native that provides not only enough food for human populations, but also for animals such as bears, deer, squirrels, turkeys, and pigeons now extinct passengers.

Chestnuts, due to 42% starch content, can be ground into a flour powder without deterioration for long periods and is baked in sweet cakes nutritious. In Korea the chestnuts are used in the diet as much as potatoes are used in Western nations.

American chestnut trees are among larger trees are in the U.S. This, sometimes measuring 17 feet in diameter large enough to drive a car or car through. These trees walnuts are found growing from Maine to Florida and the east coast of the American middle class. Some scattered chestnut forests can be found in Western states. The grandeur and elegance of this incredibly beautiful tree was highly desirable in real landscapes. The long white catkins brown flowers became a growing valuable food for the U.S. The tall, straight trunk of the tree was ideal for many applications as easily split along the grain of the wood and split rail fences. The dense forest was strong and very resistant to decay, making it ideal for telephone poles, fence posts and other building materials.

The great gift for the New World of American chestnut that provide food, shelter, shade, and timber resources, had disappeared when the trees were victims of a yeast infection, Cryphonectria parasitica, 'in 1904. Many years before, a USDA plant explorer Frank Meyer, a disease noted fungus, later identified as Chestnut blight had entered U.S. ports in 1876 from China and Japan on imported nursery in those countries. Luther Burbank, perhaps the largest in the world of hybrid plants, reported that a number of chestnuts imported from China and Japan in 1884. The official USDA presented before Congress in 1912 after the plague decimated the American chestnut trees at the Bronx Zoo, and was given credit for their efforts in person to stop further debilitating diseases and pests imported into the U.S. through the enactment of the Plant Quarantine Act of Congress.

Following the example of President Thomas Jefferson at the crossroads of various species of chestnuts for hybrid vigor and the offspring they may have, within the tree's genetic material, a built-in resistance to disease, the USDA began American chestnut hybrid, 'Castanea dentata' the Chinese chestnut, 'Castanea' mollissima, and Japanese chestnut, 'Castanea crenata. Thousands of chestnut hybrids were obtained, however, the American and Chinese descent were the most promising, while the Japanese chestnut trees were excluded. European types of chestnut genetics also omitted, because they were also beaten up some measured by the chestnut blight.

From the outcross chestnut hybrid seed were so highly variable and unpredictable results as germination were not available, the seed of a hybrid tree selected result did not show much promise towards establishing profitable commercial chestnut orchards. The chestnut outstanding selections hybrids were grafted with extreme difficulty, therefore, the USDA was forced to abandon their efforts on the chestnut in 1960.

It mention that the chestnut blight does not affect the roots of trees and thus emerge from the stumps sprouts that eventually produce a few nuts scattered can be used to further the research in obtaining immunity in a hybrid American chestnuts "Castanea dentata. The chestnut blight only affects the Chinese chestnut, "Castanea sativa", a minor superficial. It became important to recognize that this quality can be immune transmitted to an American chestnut hybrid, although the presence of the Chinese chestnut immunity factor was only one-sixteenth of the final composition genetics hybrids that could be obtained from the cross of C. and C. dentata mollissima.

Luther Burbank reported a horse-breeding gene pool resultant involved crossing Japanese, Chinese, European (Italian), and the American chestnut to also include chinquapin trees. This genetic mixing, achieved develop a brown dwarf of 1 ½ feet tall nuts produced from the seed after six months of being planted. He also managed to produce a crop Everbearing chestnut trees involved chestnuts and flowers that occur month after month continually. The nuts were a gigantic two-inch diameter, each weighing one ounce or more in groups of 6-9 nuts per burr. In the natural state, strawberries thorny act as armor that protects the nuts from the squirrels and birds.

More recent observations by the Italian Antonio pathologist Biraghi have shown that survivors of some of the European chestnut, C. sativa, is believed to contain a form of the chestnut blight that has been genetically weakened in the virulence of a virus from the inner to the extent that the effect, called "hypovirulence" seems to show that the virus affected chestnut trees have acquired a degree of immunity to the deadly chestnut blight fungus. These clones are believed by many scientists of plants be capable of providing a new immunity in the new C. dentata hybrid crosses with C. sativa and backcrossing to parents and the genetic types are being evaluated.

Many chestnut trees are offered by mail order and now the Internet companies, which offers a hopeful and productive future for chestnut orchards. Some of these offers are available through the valuable information and the efforts of the U.S. Department of Agriculture and research facilities.

About the Author

Patrick A. Malcolm, owner of TyTy Nursery, has an M.S. degree in Botany and has cultivated chestnut trees for over three decades.

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