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Rice is a cereal grain, and in its domesticated form is the staple food for over half of the world's human population, particularly in Asia and Africa, due to the vast amount of soil that is able to grow rice. Rice is the seed of the grass species Oryza sativa or, much less commonly, O. glaberrima. Asian rice was domesticated in China some 13,500 to 8,200 years ago, while African rice was domesticated in Africa some 3,000 years ago. Rice has become commonplace in many cultures worldwide; in 2021, 787 million tons were produced, placing it fourth after sugarcane, maize, and wheat. Only some 8% of rice is traded internationally. China, India, and Indonesia are the largest consumers of rice. A substantial amount of the rice produced in developing nations is lost after harvest through factors such as poor transport and storage. Rice yields can be reduced by pests including insects, rodents, and birds, as well as by weeds, and by diseases such as rice blast. Traditional polycultures such as rice-duck farming, and modern integrated pest management seek to control damage from pests in a sustainable way.
Triticale is a hybrid of wheat (Triticum) and rye (Secale) first bred in laboratories during the late 19th century in Scotland and Germany. Commercially available triticale is almost always a second-generation hybrid, i.e., a cross between two kinds of primary (first-cross) triticales. As a rule, triticale combines the yield potential and grain quality of wheat with the disease and environmental tolerance of rye. Only recently has it been developed into a commercially viable crop. Depending on the cultivar, triticale can more or less resemble either of its parents. It is grown mostly for forage or fodder, although some triticale-based foods can be purchased at health food stores and can be found in some breakfast cereals.
Agricultural biotechnology, also known as agritech, is an area of agricultural science involving the use of scientific tools and techniques, including genetic engineering, molecular markers, molecular diagnostics, vaccines, and tissue culture, to modify living organisms: plants, animals, and microorganisms. Crop biotechnology is one aspect of agricultural biotechnology which has been greatly developed upon in recent times. Desired trait are exported from a particular species of Crop to an entirely different species. These transgene crops possess desirable characteristics in terms of flavor, color of flowers, growth rate, size of harvested products and resistance to diseases and pests.
Oryza sativa, also known as rice, is the plant species most commonly referred to in English as rice. It is the type of farmed rice whose cultivars are most common globally, and was first domesticated in the Yangtze River basin in China 13,500 to 8,200 years ago.
A molecular marker is a molecule, sampled from some source, that gives information about its source. For example, DNA is a molecular marker that gives information about the organism from which it was taken. For another example, some proteins can be molecular markers of Alzheimer's disease in a person from which they are taken. Molecular markers may be non-biological. Non-biological markers are often used in environmental studies.
Marker assisted selection or marker aided selection (MAS) is an indirect selection process where a trait of interest is selected based on a marker linked to a trait of interest, rather than on the trait itself. This process has been extensively researched and proposed for plant- and animal- breeding.
Oryza longistaminata is a perennial species of grass from the same genus as cultivated rice. It is native to most of sub-Saharan Africa and Madagascar. It has been introduced into the United States, where it is often regarded as a noxious weed. Its common names are longstamen rice and red rice.
A crop wild relative (CWR) is a wild plant closely related to a domesticated plant. It may be a wild ancestor of the domesticated (cultivated) plant or another closely related taxon.
Upland rice is a variety of rice grown on dry soil rather than flooded rice paddies.
Oryza glaberrima, commonly known as African rice, is one of the two domesticated rice species. It was first domesticated and grown in West Africa around 3,000 years ago. In agriculture, it has largely been replaced by higher-yielding Asian rice, and the number of varieties grown is declining. It still persists, making up an estimated 20% of rice grown in West Africa. It is now rarely sold in West African markets, having been replaced by Asian strains.
Plant genetics is the study of genes, genetic variation, and heredity specifically in plants. It is generally considered a field of biology and botany, but intersects frequently with many other life sciences and is strongly linked with the study of information systems. Plant genetics is similar in many ways to animal genetics but differs in a few key areas.
Plant disease resistance protects plants from pathogens in two ways: by pre-formed structures and chemicals, and by infection-induced responses of the immune system. Relative to a susceptible plant, disease resistance is the reduction of pathogen growth on or in the plant, while the term disease tolerance describes plants that exhibit little disease damage despite substantial pathogen levels. Disease outcome is determined by the three-way interaction of the pathogen, the plant and the environmental conditions.
Perennial rice are varieties of long-lived rice that are capable of regrowing season after season without reseeding; they are being developed by plant geneticists at several institutions. Although these varieties are genetically distinct and will be adapted for different climates and cropping systems, their lifespan is so different from other kinds of rice that they are collectively called perennial rice. Perennial rice—like many other perennial plants—can spread by horizontal stems below or just above the surface of the soil but they also reproduce sexually by producing flowers, pollen and seeds. As with any other grain crop, it is the seeds that are harvested and eaten by humans.
Plant breeding is the science of changing the traits of plants in order to produce desired characteristics. It has been used to improve the quality of nutrition in products for humans and animals. The goals of plant breeding are to produce crop varieties that boast unique and superior traits for a variety of applications. The most frequently addressed agricultural traits are those related to biotic and abiotic stress tolerance, grain or biomass yield, end-use quality characteristics such as taste or the concentrations of specific biological molecules and ease of processing.
Plant breeding started with sedentary agriculture, particularly the domestication of the first agricultural plants, a practice which is estimated to date back 9,000 to 11,000 years. Initially, early human farmers selected food plants with particular desirable characteristics and used these as a seed source for subsequent generations, resulting in an accumulation of characteristics over time. In time however, experiments began with deliberate hybridization, the science and understanding of which was greatly enhanced by the work of Gregor Mendel. Mendel's work ultimately led to the new science of genetics. Modern plant breeding is applied genetics, but its scientific basis is broader, covering molecular biology, cytology, systematics, physiology, pathology, entomology, chemistry, and statistics (biometrics). It has also developed its own technology. Plant breeding efforts are divided into a number of different historical landmarks.
Molecular breeding is the application of molecular biology tools, often in plant breeding and animal breeding. In the broad sense, molecular breeding can be defined as the use of genetic manipulation performed at the level of DNA to improve traits of interest in plants and animals, and it may also include genetic engineering or gene manipulation, molecular marker-assisted selection, and genomic selection. More often, however, molecular breeding implies molecular marker-assisted breeding (MAB) and is defined as the application of molecular biotechnologies, specifically molecular markers, in combination with linkage maps and genomics, to alter and improve plant or animal traits on the basis of genotypic assays.
Breeding for drought resistance is the process of breeding plants with the goal of reducing the impact of dehydration on plant growth.
Trilochan Mohapatra is an Indian biotechnologist, geneticist, former government secretary of the Department of Agricultural Research and Education (DARE) and former director general of the Indian Council of Agricultural Research. Known for his studies in the fields of molecular genetics and genomics, Mohapatra is an elected fellow of the National Academy of Sciences, India, the National Academy of Agricultural Sciences, the Indian National Science Academy and the Indian Society of Genetics and Plant Breeding. The Department of Biotechnology of the Government of India awarded him the National Bioscience Award for Career Development, one of the highest Indian science awards, for his contributions to biosciences in 2003.
Gene stacking is the combination of more than one gene for plant disease resistance, or crop productivity, or other horticultural traits. In plant breeding traditionally that means breeding those genes in, but increasingly also can mean genetic engineering. This can be achieved a few different ways, and gene pyramiding is one of those methods. Stacking of transgenes is yet more difficult than stacking natural genes, but especially in the case of pest resistance genes which require a significant financial investment to insert, is advantageous over other methods. Pathosystems with rapid evolution in the pathogen have long been considered good targets of stacking, to broaden and prolong resistance.
Samuel S. Gnanamanickam is an Indian plant pathologist. He is known for his research on diversity of rice pathogens, molecular breeding of indica rices for disease resistance and for developing superior strains of beneficial strains of rhizosphere bacteria for biological control of rice diseases. He is a fellow of the National Academy of Agricultural Sciences and National Academy of Biological Sciences of India and was Chair of the biological control committee at the American Phytopathological Society.
References
- ↑ Rana, Maneet; Sood, Ankita; Hussain, Waseem; Kaldate, Rahul; Sharma, Tilak Raj; Gill, R. K.; Kumar, Shiv; Singh, Sarvjeet (2019-01-01), Singh, Mohar (ed.), "Chapter 6 - Gene Pyramiding and Multiple Character Breeding", Lentils, Academic Press, pp. 83–124, ISBN 978-0-12-813522-8 , retrieved 2024-02-29
- ↑ Dormatey, Richard; Sun, Chao; Ali, Kazim; Coulter, Jeffrey A.; Bi, Zhenzhen; Bai, Jiangping (September 2020). "Gene Pyramiding for Sustainable Crop Improvement against Biotic and Abiotic Stresses". Agronomy. 10 (9): 1255. doi: 10.3390/agronomy10091255 . ISSN 2073-4395.
- ↑ Fukuoka, Shuichi; Saka, Norikuni; Mizukami, Yuko; Koga, Hironori; Yamanouchi, Utako; Yoshioka, Yosuke; Hayashi, Nagao; Ebana, Kaworu; Mizobuchi, Ritsuko; Yano, Masahiro (2015-01-14). "Gene pyramiding enhances durable blast disease resistance in rice". Scientific Reports. 5 (1): 7773. Bibcode:2015NatSR...5E7773F. doi:10.1038/srep07773. ISSN 2045-2322. PMC 5379001 . PMID 25586962.
- ↑ Chukwu, Samuel Chibuike; Rafii, Mohd Y.; Ramlee, Shairul Izan; Ismail, Siti Izera; Oladosu, Yussuf; Okporie, Emmanuel; Onyishi, Godwin; Utobo, Emeka; Ekwu, Lynda; Swaray, Senesie; Jalloh, Momodu (2019-01-01). "Marker-assisted selection and gene pyramiding for resistance to bacterial leaf blight disease of rice ( Oryza sativa L.)". Biotechnology & Biotechnological Equipment. 33 (1): 440–455. doi:10.1080/13102818.2019.1584054. ISSN 1310-2818.
- ↑ Taverniers, Isabel; Papazova, Nina; Bertheau, Yves; De Loose, Marc; Holst-Jensen, Arne (2008). "Gene stacking in transgenic plants: towards compliance between definitions, terminology, and detection within the EU regulatory framework". Environmental Biosafety Research . EDP Sciences. 7 (4): 197–218. doi: 10.1051/ebr:2008018 . ISSN 1635-7922. PMID 19081008. p. 199, "Independent of modern biotechnology, “stacking” traditionally refers to the natural addition of different plant properties by genetic crossing. Modern biotechnology has broadened the options for stacking to include more taxonomically diverse sources, a wider selection of genes and regulatory elements, and consequently of traits."
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