Phosphatverteilung und Transport in keimendem Mais

Zürich

1960

S. 279-288

6 Abb., 2 Tab., 10 Lit. Ang.

Artikel aus einer ZeitschriftUnselbständiges Werk

200151001

1. Caryopses of Zea mays were brought to germination in the dark at 22°C. Previous to extraction the seedlings were separated into endosperm, shoot, root and scutellum. 2. The following fractions of the phosphorus content were separated: phsphorus soluble and insoluble in cold trichloracetic acid, free inorganic phosphate, organic acid soluble phosphorus, nucleic acid phosphorus, lipid phosphorus. 3. By paper chromatography it could be shown that the fraction "acid soluble organic phsophorus" of the scutellum consists to about 90 % of phytic acid. The other parts of the seedling do not contain phytic acid. It is probable however, that in the aleurone layer there is a relatively small quantity. 4. The main storage organ of the corn seedling for phosphorus is its cotyledo, the secutellum. The endosperm delivers only a small amount of phosphorus to the seedling during germination. 5. Phytic acid is the most important form of reserve substance for phosphorus. A considerable amount of "nucleic acid phosphorus" disappears during germination from the scutellum and is translocated to the axis of the seedling. 6. Most of the phosphorus from the scutellum is translocated in the form of free phosphate to the shoot. A small amount only is transported into the root system. 7. An explanation and the possible significance of these results is discussed.