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Two Sites of Hormonal Action during Germination of Chenopodium album Seeds
Author(s) -
KARSSEN C. M.
Publication year - 1976
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1976.tb04426.x
Subject(s) - kinetin , gibberellin , germination , darkness , ethylene , radicle , zeatin , botany , chenopodium , biology , ethephon , abscisic acid , incubation , chenopodiaceae , chemistry , horticulture , cytokinin , auxin , biochemistry , tissue culture , in vitro , gene , weed , catalysis
During the overall germination process in the light‐requiring seeds of Chenopodium album L. two sites of hormonal action can be distinguished. The start of visible growth is induced in darkness by the gibberellins 4 and 7 (GA 4+7 ) or by ethylene. Added cytokinins are inactive although 8‐ 14 C‐kinetin shows rapid penetration into the seed and rapid turnover. The induction of growth by GA 4+7 and the uptake of 8‐methylene‐ 14 C‐GA 3 are enhanced at lower pH values. Prolonged incubation in darkness results in a decreased responsiveness of the seeds towards GA 4+7 and ethylene. A second site of hormonal action is located during the progress of growth inside the covering structures. ABA inhibits radicle growth, while GA 4+7 , GA 3 , kinetin, zeatin and ethylene reduce the inhibition.