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#MS medium

3 public questions tagged with this topic.

Plant tissue culture 1

Which medium is specially designed for woody plants?

Woody Plant Medium WPM specially formulated by Lloyd and McCown in 1980 to meet nutritional demands of woody trees shrubs and hard to culture species which exhibit ammonium toxicity tip necrosis and vitrification on high salt MS medium. WPM lowers total nitrogen to roughly one quarter of MS, ammonium nitrate 400 mg per L versus 1650, calcium nitrate increased to improve lignification and middle lamella stability, potassium sulfate replaces potassium nitrate at lower level to reduce hyperhydricity, and microelements adjusted copper sulfate elevated for lignin biosynthesis polyphenol oxidase. It

Ref: Lloyd & McCown Int Plant Prop Soc 1980 WPM; NCBI woody plant medium formulation.

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Plant tissue culture 1

Macronutrients in MS medium are required at concentration:

In plant tissue culture classification, macronutrients are defined as elements required at concentration greater than 0.5 millimolar, reflecting their roles as building blocks and osmotic regulators. They include nitrogen incorporated into amino acids, nucleotides, chlorophyll porphyrin and alkaloids; potassium acting as cofactor for over 40 enzymes, osmoregulator for stomatal opening; calcium essential for middle lamella calcium pectate crosslinking cell walls and as secondary messenger binding calmodulin during stress signaling; magnesium central atom of chlorophyll and bridge for ATP Mg com

Ref: Gamborg et al., Exp Cell Res; MS medium macronutrient composition, Plant Cell Culture Manual.

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Plant tissue culture 1

Most widely used plant tissue culture medium is:

Murashige and Skoog medium proposed in 1962 for tobacco pith culture remains gold standard and most widely used basal medium for plant tissue culture due to broad applicability and high salt formulation supporting rapid growth across herbaceous and many woody species. Its composition features high concentrations of macronutrients ammonium nitrate 1650 mg per L and potassium nitrate 1900 mg per L providing dual nitrogen source favoring both amino acid synthesis and pH buffering, plus calcium chloride, magnesium sulfate, potassium dihydrogen phosphate; chelated iron as Fe-EDTA, micronutrients ma

Ref: Murashige & Skoog Physiol Plant 1962; NCBI NBK26873 MS medium composition.

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