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The Effect of Stratification on the Endogenous Cytokinin Levels of Seed of Protect compacta and Leucadendron daphnoides
Author(s) -
BROWN N. A. C.,
STADEN J.
Publication year - 1973
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.1399-3054.1973.tb08576.x
Subject(s) - germination , dormancy , cytokinin , seed dormancy , radicle , cotyledon , biology , botany , agamous , horticulture , auxin , biochemistry , gynoecium , pollen , stamen , gene
The soybean callus assay was used to study the effect of stratification on the cytokinin levels of the embryo dormant seed of Protea compacta R.Br. and the seed of Leucadendron dapbnoides Meisn., where dormancy is coat imposed. Chilling the seed for 30 days increased germination significantly, and resulted in a simultaneous increase in the butanol soluble cytokinins of both species. It would appear as if these compounds are either synthesized or released from a bound form in embryo dormant seed. In contrast, an interconversion from water soluble to butanol soluble cytokïnins appears to account for the increase where dormancy is coat imposed. The results also indicate that for germination to take place a threshold concentration of cytokinin may be required. It is suggested that the increase in butanol soluble cytokinins may lead to the breaking of dormancy, probably by increasing radicle elongation and/or cotyledon expansion.