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 .

Author: Musar Dajind
Country: Armenia
Language: English (Spanish)
Genre: Travel
Published (Last): 23 March 2004
Pages: 448
PDF File Size: 7.50 Mb
ePub File Size: 7.13 Mb
ISBN: 926-4-30400-803-2
Downloads: 84897
Price: Free* [*Free Regsitration Required]
Uploader: Fejinn

New variation at the haploid level induced by the chromosome doubling, and iv. These variants are obtained from both meiotic and mitotic divisions. Gametoclonal variation in crop improvement.

Gametoclonal variation in crop plants [1998]

Jiangsu Journal of Agricultural Sciences 18 2: Variation is induced either during plant development or in vitro cell cultures, in the mitotic process. 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 regenerated from somatic 2n, somaclones and gametic tissues n, gametoclonesand also between somaclonal and gametoclonal variation.

There are four distinct sources of variations when gametoclonl to gametoclonal variation: The concept of gametoclonal variation evolved from that of somaclonal variation.


In vitro haploid production in higher plants 1, Chromosome number can be doubled by treating haploid plants with colchicines which is a frequently used mutagen to induce diploidization. In vitro selection of somaclonal and gametoclonal variants for salt tolerance in rice.

Somaclonal and gametoclonal variation

Since plants derived from gametic cells are usually haploid but to retain the fertility chromosome number should be doubled.

New genetic variations induced by the cell culture procedures. 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.

Variations resulting from segregation and independent assortment.

Both somaclonal and gametoclonal variations were detected in cultured cells and regenerated plants for morphological, biochemical characteristics, and chromosome number and structure. Direct expression of both dominant and recessive mutations in the regenerated plants is a distinct feature of gametoclonal variation.

Gametoclonal variation in pepper. Somaclonal variation gametolonal banana: The variation observed among plants regenerated from gametic cell cultures is termed as gametoclonal variation.

Cellular and Molecular Biology Letters 7 4: Somaclonal and gametoclonal variation in wheat, cotton and Brassica. Bermudagrass somaclonal variation for fall armyworm susceptibility.


PDF of Somaclonal and gametoclonal variation

Advances in agricultural gametoclonap Biotechnology for solving agricultural problems: Clone is defined as a population of a cell or organisms derived from a single cell or common ancestor by mitosis.

The life cycle of higher plants comprises a sporophytic 2n and a gametophytic n generation.

Problemy teoreticheskoi i prikladnoi genetiki v Kazakhstane: New variation induced at the diploid level, resulting in heterozygosity. Gametoclonal variation in the anther culture of wheat. The effects of growth regulators on somaclonal variation in rye Secale cereale L. Gametoclonal variation in crop plants. Somaclonal and gametoclonal variation.

Journal of Tropical and Subtropical Botany 10 2: The concept of somaclonal variation is built on this definition. Somaclonal variation and induced mutations in crop improvement Somaclonal variation in a somaclonal mutant HX-3 of rice. Somaclonal variation of cytoplasmic male sterile lines with wild rice cytoplasm: Materialy Res ikanskoi konferentsii, Alma Ata, noyabrya, Gametoclonal variation The variation observed among plants regenerated from gametic cell cultures is termed as gametoclonal variation.