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EFFECT OF 2‐THIOURAGIL AND GIBBERELLIC ACID ON FLOWER FORMATION IN WEDGWOOD IRIS
Author(s) -
PEREIRA A. S. RODRIGUES
Publication year - 1966
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1966.tb00227.x
Subject(s) - gibberellic acid , primordium , biology , uracil , botany , stamen , nucleic acid , emasculation , horticulture , biochemistry , dna , pollination , pollen , germination , gene
A bstract1) 2‐Thiouracil (2‐TU) applied during low temperature treatment, inhibited flower formation in excised stem discs of Wedgwood iris. The inhibition was overcome by gibberellic acid (GA) and orotic acid but not by uracil or thymidine. 2) The first signs both of an inhibitive effect on flower initiation by 2‐TU and of GA promotion occurred at the beginning of the reproductive stage. Increase or decrease of the rate of development of the flower primordium could be established only two weeks later, during differentiation of stamens or tepals. 3) The peak in respiration rate occurring in the bud at the beginning of the reproductive stage was entirely repressed by 2‐TU and not restored on a medium containing 2‐TU and GA. 4) It is concluded that a specific RNA takes part in the earlier stages of flower formation in Wedgwood iris. 5) The role of gibberellih‐like substances in flower formation of the Wedgwood iris is discussed in the light of possible interaction with nucleic acid metabolism.