Murashige and Skoog Shoot Multiplication Medium A is a widely used plant tissue culture growth medium. M&S Basal Medium contains macronutrients that include high levels of nitrate and organic additives such as agar, sugars, vitamins and growth regulators. Important growth regulators frequently added to M&S include IAA (auxin/morphogen) and the Kinetin (cytokinin/cell division promoter).

如 Huang and Murashige (1976) TCA Manual 所述含常量营养和微量营养素、维生素、蔗糖、IAA、磷酸钠、腺嘌呤以及 2iP。

Murashige and Skoog medium can be reconstituted from powder or by combining products that are major components of complete M&S medium, such as macronutrient mixtures and vitamin mixtures. Murashige and Skoog Shoot Multiplication Medium A (M7024 is a variant media) with macro- and micronutrients, vitamins, sucrose, IAA, sodium phosphate, adenine and 2iP.