GAMETOCLONAL VARIATION PDF
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 .
|Published (Last):||11 June 2010|
|PDF File Size:||15.74 Mb|
|ePub File Size:||14.23 Mb|
|Price:||Free* [*Free Regsitration Required]|
New variation at the haploid level induced by the chromosome doubling, and iv. Gametoclonal variation in pepper.
NPTEL :: Biotechnology – Plant Biotechnology
The concept of gametoclonal variation evolved from that of somaclonal variation. Somaclonal variation and induced mutations in crop improvement New genetic variations induced by the cell culture procedures.
Biotechnology for solving agricultural problems: Gametoclonal variation in crop improvement. Jiangsu Journal of Agricultural Sciences 18 2: 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.
There are four distinct sources of variations when referring to gametoclonal variation: Advances in agricultural biotechnology: New variation induced at the diploid level, resulting in heterozygosity.
Problemy teoreticheskoi i prikladnoi genetiki v Kazakhstane: Gametoclonal variation gamdtoclonal the anther culture of wheat. The concept of somaclonal variation is built on this definition. Somaclonal and gametoclonal variation in wheat, cotton and Brassica. Chromosome number can be variatkon by treating haploid plants with colchicines which is a frequently used mutagen to induce diploidization.
Bermudagrass somaclonal variation for fall armyworm susceptibility. In vitro haploid production in higher plants 1, Materialy Res ikanskoi konferentsii, Alma Ata, noyabrya, Direct expression of both dominant and recessive mutations in the regenerated plants is a distinct feature of gametoclonal variation.
Gametoclonal variation The variation observed among variatioon regenerated from gametic cell cultures is termed as gametoclonal variation. These variants are obtained from both meiotic and mitotic divisions.
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 a somaclonal mutant HX-3 of rice.
Gametoclonal variation in crop plants 
Since plants derived from gametic cells are usually haploid but to retain the fertility chromosome number should be doubled. Gametoclonal variation in crop plants. Variations resulting from variarion and independent assortment.
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. Variation is induced either during plant development or in vitro cell cultures, in the mitotic process.
Clone is defined as a population of a variatino or organisms derived from a single cell or common ancestor by mitosis.
PDF of Somaclonal and gametoclonal variation
Somaclonal and gametoclonal variation. Journal of Tropical and Subtropical Botany 10 2: Somaclonal variation in banana: Cellular and Molecular Biology Letters 7 4: In vitro selection of somaclonal and gametoclonal variants for salt tolerance in rice. The life cycle of higher plants comprises a sporophytic 2n and gametclonal gametophytic n generation.
Field performance of bermudagrass germplasm expressing somaclonal variation selected for divergent responses to fall armyworm. Somaclonal variation of cytoplasmic male sterile lines with wild rice cytoplasm: The effects of growth regulators on somaclonal variation in rye Secale cereale L. The variation observed among plants regenerated from gametic cell cultures is termed as gametoclonal variation.