Premium
The Implication of Auxin in the UV Promoted Expansion of Etiolated Bean Leaf Disks
Author(s) -
Spang Henry 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.tb07051.x
Subject(s) - etiolation , auxin , incubation , ultraviolet radiation , chemistry , endogeny , ultraviolet , horticulture , biophysics , botany , biology , biochemistry , radiochemistry , physics , enzyme , optics , gene
A promotion of expansion of etiolated bean leaf disks by ultraviolet (UV) radiation was confirmed. The optimum conditions for the effeet were found to be 5 seconds UV exposure followed by 24 hours of incubation at 25°C and pH 6.2. Macerations and sections of the treated and control disks indicated that the basis of the response was an increase in the number of cells in the UV treated disks. Experiments with indolebutyric acid (IBA) and p ‐chlorophenoxyisobutyric acid (PCIB) indicated that the UV apparently acted to reduce a superoptimal endogenous auxin level to an optimum level which resulted in promotion of the expansion.