Limitations to the Use of Somaclonal Variation in Crop Improvement

摘要: Somaclonal variation in the major crop plants, rice, wheat, maize, barley, triticale, sugarcane, potato and a few forage grasses is reviewed. Reported somaclonal variants include chlorophyll-deficient those with changed morphology, single-gene mutations, polyploidy, aneuploidy, chromosomal re-arrangements, modified yield, quality disease resistance, occasionally novel not present natural gene pools. results from both dominant recessive mutations. The type frequency of suggests that akin to non-directed, random mutagenesis which generates large amount unwanted variation. Consequently, most either useless or limited use direct varietal upgrading. However, are easier detect than conventional mutagenesis. It concluded development in-vitro selection procedures essential sieve out useful overcome constraints breeding programs.