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Plant and Cell Physiology, 1963, Vol. 4, No. 2 145-152
© 1963

Article

INHIBITORY EFFECT OF THIOURACIL ON GERMINATION OF LEAF MUSTARD SEED AND ITS REVERSAL BY PYRIMIDINE DERIVATIVES

KUNIO SHIMENO and SHUKUO KINOSHITA

Tokyo Research Laboratory, Kyowa Hakko Kogyo Co., Ltd. Machida, Tokyo

  1. Investigations were carried out to examine the effects of certain nucleic acid antimetabolites upon the germination of leaf mustard seed. Antimetabolites tested were 2 barbituric acid, various uracil analogues, azaadenine, azaxanthine, azaguanine and benzimidazol.
  2. Among the antimetabolites tested, only 2-thiouracil showed a strong inhibitory action on the germination of Brassica juncea var. foliosa (BAILEY) Corn. "Akatirimen".
  3. This inhibition by 2-thiouracil was relieved markedly by such pyrimidine derivatives as uracil, thymine, orotic acid, uridylic acid and cytidylic acid, though these compounds did not show any promotive effect on the germination by themselves.
    On the other hand, such a relieving effect was not shown by purine derivatives such as adenine, hypoxanthine and xanthine.
  4. Among other kinds of cole-wort seeds tested, a similar thiouracil inhibition on seed germination was observed only in a limited number of species or varieties.

(Received November 10, 1962; )
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