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Breaking of Dormancy in Xanthium Seeds by Kinetin Mediated by Light and DNA‐dependent RNA Synthesis
Author(s) -
Khan A. A.
Publication year - 1966
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.1399-3054.1966.tb07076.x
Subject(s) - kinetin , xanthium , gibberellic acid , dormancy , phytochrome , germination , seed dormancy , biology , endogeny , derepression , dna synthesis , psychological repression , gibberellin , dna , botany , rna , microbiology and biotechnology , biochemistry , red light , tissue culture , gene expression , gene , in vitro
Kinetin was able to break the dormancy of the “upper seed” (in bur) of Xanthium by antagonizing the endogenous inhibitor present in the embryo. Other growth substances like indoleacetic acid, gibberellic acid and cycocel were without effect. Breaking of dormancy by kinetin was dependent on reversible phytochrome system and DNA‐dependent RNA synthesis. Protein synthesis is possibly not involved in the act of dormancy breaking. Endogenous inhibitor possibly participates in the mechanism of repression of genie site(s). It is suggested that an interplay of endogenous inhibitors, kinins and other factors (light, temperature, etc .) regulate dormancy, germination and differentiation by repression and derepression of DNA sites.