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The Selective Effect of Abscisic Acid on Ribonucleic Acid Components
Author(s) -
LESHEM Y.,
SCHWARZ LEAH
Publication year - 1972
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.1399-3054.1972.tb01118.x
Subject(s) - abscisic acid , rnase p , transfer rna , rna , ribosomal rna , biochemistry , gibberellic acid , uridine , in vivo , chemistry , hydrolysis , biology , germination , botany , gene , genetics
As determined by methylated albumin kieselguhr (MAK) fractionation, GA 3 (gibberellic acid) significantly increased and ABA (abscisic acid) decreased RNA levels. In the case of ABA this effect was selective, the ribosomal RNA manifesting the typical decrease; while the sRNA peak was markedly increased. The pattern of labelled uridine incorporation into RNA resembles the MAK absorbancy profile and here as well, ABA although causing an overall decrease, increases labelling in the sRNA peak. The results are interpreted as a possible selective effect of ABA or alternatively as an accumulation in the sRNA peak of rRNA breakdown products. From in vitro experiments it was furthermore evident that ABA mediated RNA hydrolysis probably does not involve a direct activation of RNase by ABA. The in vivo effect would probably be devious.