Optimal growth and morphogenesis of tissues may vary for different plants according to their nutritional requirements. Moreover, tissues from different parts of plants may also have different requirements for satisfactory growth [1]. Tissue culture media were first developed from nutrient solutions used for culturing whole plants e.g. root culture medium of White and callus culture medium of Gautheret. White’s medium was based on Uspenski and Uspenska’s medium for algae, Gautheret’s medium was based on Knop’s salt solution [2]. Basic media that are frequently used include Murashige and Skoog (MS) medium [1], Linsmaier and Skoog (LS) medium [3], Gamborg (B5) medium [4] and Nitsch and Nitsch (NN) medium [5]
Media Composition
Plant tissue culture media should generally contain some or all of the following components: macronutrients, micronutrients, vitamins, amino acids or nitrogen supplements, source(s) of carbon, undefined organic supplements, growth regulators and solidifying agents. According to the International Association for Plant Physiology, the elements in concentrations greater than 0.5 mM.l-1 are defined as macroelements and those required in concentrations less than 0.5 mM.l-1 as microelements [6]. It should be considered that the optimum concentration of each nutrient for achieving maximum growth rates varies among species.
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