Well first of all welcome to the orchid board from the OCRC in China.
Murashige and Skoog (1962) is today still a good vitro formula; and it has been modified many times.
Variations are simply created to improve it or modify it to try and gain maximum results and many times just because of lack of chemicals needed.
Knudson formula is a good example; Knudson, Knudson B, Knudson C, Knudson C (Knudson, 1946), Knudson C (Stoutamire, 1964), Knudson C (Morel, 1965), Knudson C (Arditti, 1982), Knudson C (Anderson, 1990) many vitro formulas have been modified for orchid seed sow, replate, tissue.
Truly the more they are used and documented (AKA information made public) the better understanding we will have in orchid propagation.
We at the OCRC have collected some 145 vitro formulas and we try one seed capsule in many different vitro formulas to see what one can produce the most optimum results.
There are many good books you can read about this; I recommend Dr, Arditti books like micrpropagation, orchid biology and review.
If you go to Orchid Board social group and you will see Flasking ect…….. is a place that you can ask question and share ideas.
Just a short answer to your question.
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