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Articles

Movement of ¹⁴C-compounds from Maternal Tissue into Maize Seeds Grown in Vitro^1,2

Department of Genetics, University of Wisconsin, Madison, Wisconsin 53706

Uptake from nutrient media into the cob and translocation of various ¹⁴C-compounds from maternal tissue (cob) into developing maize seeds was examined by using caryopsis cultures. Based on relative ¹⁴C concentrations in the cob and the endosperm, it was concluded that the relative efficiencies of movement of amino acids (leucine, phenylalanine, proline), vitamins (thiamine HCl, nicotinic acid), and nucleic acid bases (adenine, thymine) from the cob to the endosperm were 11 to 250 times lower than that of sucrose. Thiamine was unique in that it was concentrated in the embryo at a level that was almost 10 times higher than in the endosperm. The absence of auxotrophic mutants requiring an organic supplement in higher plants (other than thiamine auxotrophs) may be explained by inadequate translocation of these essential metabolites into the mutant zygotes (embryos) to enable their development to mature seeds.

¹ Research supported by the College of Agricultural and Life Sciences and by the Graduate School, University of Wisconsin-Madison.

² Laboratory of Genetics, Paper No. 2459. The investigations reported were included in the thesis submitted to the Graduate School, University of Wisconsin-Madison, by K. Shimamoto in partial fulfillment of the requirement for the PhD degree.

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