Introduction. Plants generally exhibit cytogenetic and genetic variations which help the plant breeders in crop improvement. When such variants arise through. Request PDF on ResearchGate | Gametoclonal Variation in Crop Plants | Gametoclonal variation has been defined as the variation among. breeding strategies for the use of this variation are presented and discussed. Somaclonal and gametoclonal variation are new tools for the geneticist and plant .
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Materialy Res ikanskoi konferentsii, Alma Ata, noyabrya, Field performance of bermudagrass germplasm expressing somaclonal variation selected for divergent responses to fall armyworm.
The concept of somaclonal variation is built on this definition. Both somaclonal and gametoclonal variations were detected in cultured cells and regenerated plants for morphological, biochemical characteristics, and chromosome number and structure.
Somaclonal variation in banana: Direct expression of both dominant and recessive mutations in the regenerated plants is a distinct feature of gametoclonal variation. New genetic variations induced by the cell culture procedures.
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In vitro haploid production in higher plants 1, Biotechnology for solving agricultural problems: Chromosome number can be doubled by gxmetoclonal haploid plants with colchicines which is a frequently used mutagen to induce diploidization. Problemy teoreticheskoi i prikladnoi genetiki v Kazakhstane: Variations resulting from segregation and independent assortment.
Gametoclonal variation in crop plants. Gametoclonal variation in crop improvement. The concept of gametoclonal variation evolved from that of somaclonal variation. New variation induced at the diploid level, resulting in heterozygosity. There are four distinct sources of variations when referring to gametoclonal variation: Clone is defined as a population of a cell or organisms derived from a single cell or common ancestor by mitosis.
Journal of Tropical and Subtropical Botany 10 2: In vitro selection of somaclonal and gametoclonal variants for salt tolerance in rice. Somaclonal variation and induced mutations in crop improvement Advances in agricultural biotechnology: Somaclonal variation in a somaclonal mutant HX-3 of rice.
Cellular and Molecular Biology Letters 7 4: Somaclonal and gametoclonal variation. Jiangsu Journal of Agricultural Sciences 18 2: Somaclonal and gametoclonal variation in wheat, cotton and Brassica.
Since plants derived from gametic cells are usually haploid but to retain the fertility chromosome number should be doubled. Unlike somatic cells, which in theory should be homogeneous within any single plant, the gametes are products of meiosis, governed by Mendel’s laws of segregation and independent assortment. Gametoclonal variation The variation observed among plants regenerated from gametic cell cultures is termed as gametoclonal variation.
Gametoclonal variation in the anther culture of wheat. Somaclonal variation of cytoplasmic male sterile lines with wild rice cytoplasm: For genetic reasons, it is necessary to distinguish between plants regenerated from somatic 2n, somaclones and gametic tissues n, gametoclonesand also between somaclonal and gametoclonal variation. The variation observed among plants regenerated from gametic cell cultures is termed as gametoclonal variation.
Gaetoclonal variation at the haploid level induced by the chromosome doubling, and iv. Bermudagrass somaclonal variation for fall armyworm susceptibility.
Gametoclonal variation in crop plants 
The effects of growth regulators on somaclonal variation in rye Secale cereale L. Gametoclonal variation in pepper. The life cycle of higher plants comprises a sporophytic 2n and a gametophytic n generation. These variants are obtained from both meiotic and mitotic divisions. Variation is induced either during plant development or in vitro cell cultures, in the mitotic process.