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• W1968366146 abstract "STRAUS, JACOB. (U. Oregon, Eugene.) Maize endosperm tissue grown in vitro. lII. Development of a synthetic medium. Amer. Jour. Bot. 47(8): 641-647. Illus. 1960.-The development of a synthetic medium for the growth of endosperm tissue cultures derived from the maize variety, 'Black Mexican Sweet,' is described. Previously, these tissues required yeast extract, casein hydrolyzate, or tomato juice in the medium in order to grow. The growth-supporting activity of these complexes could be attributed to their organic nitrogen content. The effect of juice extracted from fresh tomatoes is enhanced by autoclaving under acid conditions. Presumably this treatment increases the free amino acid content of the tomato juice. One-dimensional paper chromatograms of tomato juice autoclaved under acid conditions indicated the presence of a large amount of free amino acids. Addition of 1.5 X 102 M asparagine to the basal mineral-sugar-vitamin medium (White's medium plus Nitsch's trace-element solution) resulted in better growth than that supported by yeast extract, tomato juice, or casein hydrolyzate. Arginine was ineffective. Glutamine, glutamic acid and aspartic acid (all at 1.5 X 10' M) supported appreciable growth of the tissue but none of them were nearly so good as asparagine in this respect. Thus, a medium containing minerals, sugar, vitamins, and asparagine is capable of supporting excellent growth of maize endosperm tissue cultures. IN TIIE FIRST paper of this su ies (Straus and LaRue, 1954) a report was gi-ven of some of the growth requirements of corn endosperm tissue cultures. At that time, optimum growth of the tissue required, among other substances, 0.5% Seitz-filtered Difco yeast extract (YE). Preliminary experiments reported in the same paper indicated that some of the growth-promoting activity of YE could be attributed to its high organic nitrogen content. Thus, acid-hydrolyzed casein hydrolyzate (CH) or a less complex mixture of only 5 amino acids could replace about I/j of the activity of YE. LaRue (1949) and Sternheimer (1954) demonstrated that tomato juice (TJ) obtained from whole canned tomatoes was as effective in maintaining growth of the tissue as YE. However, YE was used by Straus and LaRue rather than TJ because growth supported by the latter was sometimes erratic. This was probably due to differences between the different lots of canned tomatoes. In a recent paper, Tamaoki and Ullstrup (1958) reported their work on the growth of the ends Straus, 1958) and sometimes in red tissues (Straus, 1958) . Both the colorless and red tissues have been isolated and are now maintained as separate cultures. The general methods of initial isolation of the endosperm, the general growth conditions, and" @default.
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• W1968366146 date "1960-10-01" @default.
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• W1968366146 title "MAIZE ENDOSPERM TISSUE GROWN IN VITRO III. DEVELOPMENT OF A SYNTHETIC MEDIUM" @default.
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• W1968366146 doi "https://doi.org/10.1002/j.1537-2197.1960.tb07147.x" @default.
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