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#variation control

2 public questions tagged with this topic.

Plant tissue culture 3

Avoiding prolonged exposure to which PGR reduces somaclonal variation?

Among auxins, 2,4-dichlorophenoxyacetic acid stands out for strong callus inducing activity but also high genotoxicity. At 1 to 3 mg per liter it stimulates rapid cell division through auxin response factors ARF activation, yet its stable structure persists intracellularly, generating reactive intermediates interfering with mitotic spindle assembly and DNA repair. Long-term exposure triggers hypermethylation of cytosine in CCGG sites, reactivation of dormant transposable elements like Tos17, and increased incidence of aneuploidy and polyploidy observed in barley and rice cultures. Habituação a

Ref: Evans Amer J Bot 1984 2,4-D genotoxic; Phillips Theor Appl Genet 1994; NCBI NBK153356 auxin toxicity; PubMed 24254045 epigenetic instability; Taylor & Francis tissue culture variation.

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Plant tissue culture 3

One method to reduce somaclonal variation is:

Minimizing dedifferentiation reduces accumulation of chromosomal instability. Callus phase involves disorganized rapid mitosis under influence of potent synthetic auxin, creating opportunities for endoreduplication, transposon mobilization, and methylation drift. Each additional subculture multiplies these errors. Direct regeneration circumvents callus by activating axillary meristems, adventitious shoot formation from epidermal cells, or direct somatic embryogenesis on explant surface using balanced cytokinin to auxin ratio. Because organized meristems divide less frequently and maintain tigh

Ref: Bhojwani & Razdan Plant Tissue Culture 2015 Ch 10 direct organogenesis; Thorpe In Vitro Embryogenesis; NCBI PMC7469045 reducing somaclonal variation; Murashige & Skoog direct regeneration.

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