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When a population is small or inbred, it tends to lose genetic diversity. Inbreeding depression is the loss of fitness due to loss of genetic diversity. Inbred strains tend to be homozygous for recessive alleles that are mildly harmful (or produce a trait that is undesirable from the standpoint of the breeder). Heterosis or hybrid vigor, on the ...
Hybrid Rice. Hybrid rice is a type of Asian rice that has been crossbred from two very different parent varieties. [1] As with other types of hybrids, hybrid rice typically displays heterosis or "hybrid vigor", so when grown under the same conditions as comparable purebred rice varieties, it can produce up to 30% more yield. [2]
Rice can come in many shapes, colours and sizes. This is a list of rice cultivars, also known as rice varieties.There are several species of grain called rice. [1] Asian rice (Oryza sativa) is most widely known and most widely grown, with two major subspecies (indica and japonica) and over 40,000 varieties. [2]
About 110,000 km² were planted with IR36 worldwide in 1981, [2] a success which Dr. Khush topped with IR64 and again with IR72 in 1990. The variety was one of many of the Green Revolution which replaced many local strains and genetic diversity previously found in rice paddies. It is estimated that over 100,000 local strains were grown in 1960 ...
At present, as much as 50 percent of China's total number of rice paddies grow Yuan Longping's hybrid rice and these hybrid rice paddies yield 60 percent of the total rice production in China. [6] China's total rice output rose from 56.9 million tons in 1950 to 194.7 million tons in 2017. [ 15 ]
Jasmati Rice is a conventionally bred, inbred line (variety) of long grain of rice whose name is derived from jasmine rice and basmati. Jasmati is neither "genetically engineered" (as in transgenic) nor is it an F1 hybrid. It is said to possess the traits of both grains – namely the softness (when cooked) of basmati, and the nutty aroma of ...
The rice plants in the strain can be bred to other rice strains or cultivars, and if desirable plants are produced, these are further bred to stabilize the desirable traits; the stabilized plants that can be propagated and "come true" (remain identical to the parent plant) are given a cultivar name and released into production to be used by ...
The parents are usually two inbred strains. Hybrid seed is common in industrial agriculture and home gardening. It is one of the main contributors to the dramatic rise in agricultural output during the last half of the 20th century. [1] Alternatives to hybridization include open pollination and clonal propagation. [2]