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: Faezilkree Kazralabar
Country: Gabon
Language: English (Spanish)
Genre: Environment
Published (Last): 7 March 2014
Pages: 327
PDF File Size: 13.96 Mb
ePub File Size: 18.10 Mb
ISBN: 749-3-12660-536-7
Downloads: 84328
Price: Free* [*Free Regsitration Required]
Uploader: Dukree

PDF of Somaclonal and gametoclonal variation

Somaclonal variation of cytoplasmic male sterile lines with wild rice cytoplasm: Jiangsu Journal of Agricultural Sciences 18 2: Materialy Res ikanskoi konferentsii, Alma Ata, noyabrya, Variation is induced either during plant development or in vitro cell cultures, in the mitotic process.

Gametoclonal variation in pepper. Somaclonal variation and induced mutations in crop improvement New genetic variations induced by the cell culture procedures. The effects of growth regulators on somaclonal variation in rye Secale cereale L. The concept of variatioon variation is built on this definition.

Somaclonal and gametoclonal variation

In vitro selection gametpclonal somaclonal and gametoclonal variants for salt tolerance in rice. Somaclonal and gametoclonal variation. Gametocllonal plants derived from gametic cells are usually haploid but to retain the fertility chromosome number should be doubled. Gametoclonal variation in crop improvement.


The life cycle of higher plants comprises a sporophytic 2n and a gametophytic n generation. The concept of gametoclonal variation evolved from that of somaclonal variation. Gametoclonal variation The variation observed among plants regenerated from gametic cell cultures is termed as gametoclonal variation.

NPTEL :: Biotechnology – Plant Biotechnology

New variation induced at the diploid level, resulting in heterozygosity. Direct expression of both dominant and recessive mutations in the regenerated plants is a distinct feature of gametoclonal variation.

Journal of Tropical and Subtropical Botany 10 2: 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. Bermudagrass somaclonal variation for fall armyworm susceptibility.

Clone is defined as a population of a cell or organisms derived from a single cell or common ancestor by mitosis. Somaclonal variation in a somaclonal mutant HX-3 of rice. Gametoclonal variation in crop plants.

Variations resulting from segregation and independent assortment.

Gametoclonal variation in the anther culture of wheat. Field performance of bermudagrass germplasm expressing somaclonal variation selected for divergent responses to fall armyworm. Somaclonal and gametoclonal variation in wheat, cotton and Brassica. 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.


Somaclonal variation in banana: Gametocclonal variants are obtained from both meiotic and mitotic divisions. 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 gaetoclonal induce diploidization.

Gametoclonal variation in crop plants [1998]

New variation at the haploid level induced by the chromosome doubling, and iv. There are four distinct sources of variations when referring to gametoclonal variation: Both somaclonal and gametoclonal variations were detected in cultured cells and regenerated plants for morphological, biochemical characteristics, and chromosome number and structure.

Cellular and Molecular Biology Letters 7 4: