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Indoleacetic Acid‐Induced Decrease of the Ribomiclease Activity in vivo
Author(s) -
Truelsen T. A.
Publication year - 1967
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.1399-3054.1967.tb08399.x
Subject(s) - rnase p , coleoptile , ribonuclease , enzyme , enzyme assay , in vivo , biochemistry , rna , metabolism , auxin , indole 3 acetic acid , chemistry , biology , microbiology and biotechnology , gene
A study has been made on the influence of indole‐3‐acetic acid (IAA) on the ribonuclease (RNase) activity in wheat coleoptile sections and green pea stem sections. The hormonal effects on the enzyme activity, ribonncleic acid (RNA) metabolism and growth have been compared. Addition of 10 −5 M IAA to the plant sections causes their RNase activity to decrease and their elongation to increase. Removal of the added IAA results in increasing enzyme activity and decreasing growth. The altered enzyme activities are paralleled by opposite changes in the RNA net synthesis. Administration of crystalline RNase to the plant tissue depresses growth. There is thus evidence that the in vivo effect of IAA on the RNase activity is of importance for the hormonal regulation of RNA metabolism and growth. The IAA‐induced reduction in the enzyme activity involves cellular metabolism. The effect can be suspended by means of p ‐chloromercuribenzoate. A possible mechanism for the reduction is discussed.