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#plant variation

2 public questions tagged with this topic.

Plant tissue culture 3

Qualitative characters for somaclonal variation include:

Genetic analysis distinguishes traits by inheritance pattern. Qualitative characters show distinct phenotypic classes, typically governed by one or few major genes with dominant recessive interaction and minimal environmental modulation. In tissue culture derived plants, discrete changes like flower color alteration, presence or absence of awns, variegation, leaf margin serration, or shifts in flowering date and leaf size that occur as recognizable categories illustrate this mode. Scoring involves visual classification rather than measurement, with Mendelian segregation in selfed progenies. Su

Ref: Campbell Biology 12th Ch 14 qualitative traits Mendelian; NCBI NBK11556 monogenic markers; Alberts Ch 8; Poehlman Breeding qualitative descriptors; https://www.ncbi.nlm.nih.gov/books/NBK218342/

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Plant tissue culture 3

Lack of photosynthetic ability due to altered carbon metabolism is an example of:

Biochemical variation reflects lesions in primary and secondary metabolic pathways rather than chromosome morphology. In heterotrophic tissue culture, selection pressure for photolithotrophy is relaxed, allowing chlorophyll deficient sectors, carotenoid-less callus, or mutants defective in Calvin cycle enzymes Rubisco, phosphoribulokinase, and glyceraldehyde-3-phosphate dehydrogenase to proliferate. Altered carbon metabolism impairs sucrose independence, starch synthesis, or nitrogen assimilation via nitrate reductase and glutamine synthetase deficiency. Such lines require exogenous vitamins,

Ref: Taiz & Zeiger Plant Physiology 6th ed Ch 7 photosynthesis; NCBI NBK215354 carbon metabolism; Campbell Biology 12th Ch 10 auxotrophs; Bhojwani Plant Tissue Culture biochemical variation.

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