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EFFECT OF GIBBERELLIC ACID ON ELONGATION AND NUCLEIC ACID SYNTHESIS IN ETIOLATED ALASKA PEA EPICOTYL
Author(s) -
NAKAMURA TERUKO,
YABUUCHI YASUKO,
TAKAHASHI NORIKO
Publication year - 1970
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.1970.00189.x
Subject(s) - epicotyl , gibberellic acid , etiolation , nucleic acid , elongation , rna , gibberellin , biochemistry , biology , incubation , kinetin , dna , chemistry , botany , hypocotyl , germination , in vitro , enzyme , tissue culture , materials science , ultimate tensile strength , gene , metallurgy
A bstract The following results were obtained using etiolated Alaska pea epicotyls. Gibberellic acid (GA) had the remarkable effect on the elongation in part I (elongating region) of epicotyls, whereas it had little effect on that in part II (mature region) of epicotyls. In cortex of part I and II of epicotyls, the cell number in longitudinal direction was hardly affected by GA. On the increase in width of epicotyls, GA was hardly effective in any parts of epicotyls. In both part I and II GA enhanced the incorporation of 32 P into all nucleic acid fractions prepared by methylated albumin kieselguhr (MAK) columns, i.e. sRNA, DNA and rRNA + mRNA. In part I the net increase in DNA and RNA content during the incubation period was slightly promoted by GA, whereas in part II the net decrease in both nucleic acids content was slightly promoted by GA. The relationship between GA‐induced growth and nucleic acid synthesis is discussed.