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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]
Landrace literally means 'country-breed' (German: Landrasse) [14] and close cognates of it are found in various Germanic languages.The first known reference to the role of landraces as genetic resources was made in 1890 at an agriculture and forestry congress in Vienna, Austria.
Almost no inbreeding depression occurs in self-fertilizing plants because the mode of reproduction allows natural selection to take place in wild populations of such plants. Critical steps in the improvement of self-fertilizing crops are the choice of parents and the identification of the best plants in segregating generations.
Inbreeding is the production of offspring from the mating or breeding of individuals or organisms that are closely related genetically. [1] By analogy, ...
Rice plant (Oryza sativa) with branched panicles containing many grains on each stem Rice grains of different varieties at the International Rice Research Institute. Rice is a cereal grain and in its domesticated form is the staple food of over half of the world's population, particularly in Asia and Africa.
Tobacco, corn, rice and some other crops have been engineered to express genes encoding for insecticidal proteins from Bacillus thuringiensis (Bt). [ 159 ] [ 160 ] The introduction of Bt crops during the period between 1996 and 2005 has been estimated to have reduced the total volume of insecticide active ingredient use in the United States by ...
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 ...
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]