UN 1477 5.1 / PGII
It is media containing the macro- and micronutrients, and vitamins.
Product M5519 is the complete medium whereas M5524 is just the basal salt medium.
When M5519 is on backorder, you can purchase Murashige and Skoog Basal Salt Mixture (Product No. M5524) and Murashige and Skoog Vitamin Powder (Product No. M7150). You will use 4.3 g/L of M5524 (rather than 4.4 g/L of M5519) and 1 mL/L of M7150. When combined, the salt and organic content is the same as Product No. M5519.
Precipitates are known to occur, with time, in plant tissue culture media. The precipitates have been analyzed. They are composed of small pale yellow-white particles. Analysis of precipitates indicated a predominance of iron, phosphate, and zinc. The probable cause of the precipitates is the inevitable oxidation of ferrous ions to ferric ions and the presence of unchelated ferric ions. When the solubility of ferric phosphate is exceeded precipitation occurs. There are no reports of detrimental effects on growth and development in plant tissue culture due to the precipitates.
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