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The Effect of Potassium on Cotyledon Expansion Induced by Cytokinins
Author(s) -
GREEN JEROME F.,
MUIR ROBERT M.
Publication year - 1978
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.1399-3054.1978.tb02566.x
Subject(s) - kinetin , cotyledon , potassium , cytokinin , botany , purine , chemistry , horticulture , incubation , biology , zoology , biochemistry , tissue culture , in vitro , auxin , organic chemistry , gene , enzyme
Potassium has been found to enhance greatly the expansion response of cucumber cotyledons to cytokinins. A reduction of the response to kinetin is obtained with increasing age of the cotyledons. The lesser response is associated with lower levels of potassium remaining in the cotyledon. A high level of KCI in the incubation medium offsets the lower potassium content of the tissue and enables a much larger response to the cytokinins. At 40 m M KCI the response to kinetin is 4.2 times greater than in the absence of KCI. Calcium increases the effect of potassium on the response to kinetin. When incubated in 40 m M KCI and 10 m M CaCI 2 with 10 mg/I 6‐benzylamino‐purine, the final weight of the cotyledons is 6.8 times the initial weight after just 4 days. This KCI‐CaCI 2 combination is also found to promote chlorophyll synthesis in the usual cucumber cotyledon bioassay.