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):||4 October 2006|
|PDF File Size:||15.4 Mb|
|ePub File Size:||5.44 Mb|
|Price:||Free* [*Free Regsitration Required]|
Gametoclonal variation in crop improvement.
The life cycle of higher plants comprises a sporophytic 2n and a gametophytic n generation. The variation observed among plants regenerated from gametic cell cultures is termed as gametoclonal variation. Gameroclonal variation of cytoplasmic male sterile lines with wild rice cytoplasm: Advances in agricultural biotechnology: In vitro haploid production in higher plants 1, New genetic variations induced by the cell culture procedures. Somaclonal and gametoclonal variation in wheat, cotton and Brassica.
The effects of growth regulators on somaclonal variation in rye Secale cereale L. Chromosome number can be doubled by treating haploid plants with colchicines which is a frequently used mutagen to induce diploidization. Somaclonal variation and induced mutations in crop improvement Clone is defined as a population of a cell or organisms derived from a single cell or common ancestor by mitosis.
Direct expression of both dominant and recessive mutations in the regenerated plants is a distinct feature of gametoclonal variation.
Gametoclonal variation in crop plants 
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. Gametoclonal variation in the anther culture of wheat. Cellular and Molecular Biology Letters 7 4: These variants are obtained from both meiotic and mitotic divisions. Somaclonal variation in a somaclonal mutant HX-3 of rice.
NPTEL :: Biotechnology – Plant Biotechnology
Somaclonal variation in banana: New variation induced at the diploid level, resulting in heterozygosity. Bermudagrass somaclonal variation for fall armyworm susceptibility.
Variation is induced either during plant development or in vitro cell cultures, in the mitotic process. The concept of gametoclonal variation evolved from that of somaclonal variation. There are four distinct sources of variations when referring to gametoclonal variation: Materialy Res ikanskoi konferentsii, Alma Ata, noyabrya, Gametoclonal variation The variation observed among plants regenerated from gametic cell cultures is termed as gametoclonal variation.
Unlike somatic cells, which in theory should be homogeneous within any single plant, the gametes are products of meiosis, governed variatioon Mendel’s laws of segregation and independent assortment. New variation at the haploid level induced by the chromosome doubling, and iv. Journal of Tropical and Subtropical Botany 10 2: In vitro selection of somaclonal and gametoclonal variants for salt tolerance in rice.
Gametoclonal variation in crop plants. Jiangsu Journal of Agricultural Sciences 18 2: Variations resulting from segregation and independent assortment.
Since plants derived from gametic cells are usually haploid but to retain the fertility chromosome number should be doubled.
Somaclonal and gametoclonal variation
Problemy teoreticheskoi i prikladnoi genetiki v Kazakhstane: Biotechnology for solving agricultural problems: Gametoclonal variation in pepper. Field performance of bermudagrass germplasm expressing somaclonal variation selected for divergent responses to fall armyworm.
For genetic reasons, it is necessary to distinguish between plants hametoclonal from somatic 2n, somaclones and gametic tissues n, gametoclonesand also between somaclonal and gametoclonal variation. Somaclonal and gametoclonal variation.