Searle - Bioassay of Floral Stimulus in Xanthium
نویسنده
چکیده
11. GWIRTSMAN, J., R. MAVRODINEAU, AND R. R. COE. 1957. Determination of fluorides in plant tissue, air, and water. Anal Chem. 29: 887-92. 12. HANDLEY, R. AND R. OVERSTREET. 1961. Uptake of calcium and chlorine in roots of Zea mays. Plant Physiol. 36: 766-69. 13. MACINTIRE, W. H. 1951. Report on fluorine. The direct double distillation procedure for the determination of the fluorine content of soils. J. Assoc. Offic. Agr. Chemists 34: 597-603. 14. VENKATESWARLU, P. 1955. D. Sc. Thesis, Andhara (India) University. 15. VIETs, F. G., JR. 1944. Calcium and other polyvalent cations as accelerators of ion accumulation by excised barley roots. Plant Physiol. 9: 466-80. 16. ZIMMERMAN, P. W., A. E. HITCHCOCK, AND J. GWIRTSMAN. 1957. Fluorine in foods with special reference to tea. Contrib. Boyce Thompson Inst. 19: 49-53.
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Flowering in Xanthium strumarium: INITIATION AND DEVELOPMENT OF FEMALE INFLORESCENCE AND SEX EXPRESSION.
Vegetative plants of Xanthium strumarium L. grown in long days were induced to flower by exposure to one or several 16-hour dark periods. The distribution of male and female inflorescences on the flowering shoot was described, and a scoring system was designed to assess the development of the female inflorescences. The time of movement of the floral stimulus out of the induced leaf and the timi...
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The formation of the flower-inducing principle in the leaves of Xanthium pensylvanicum Wallr. has been shown by Hamner (1) to consist of at least two partial reactions: a preliminary high intensity light process, followed by a process requiring for its completion a minimum period of continuous darkness. Recently it was reported (3) that the flowering response of Xanthium may be suppressed when ...
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Interrupting each long night with a prolonged period of far red radiant energy resulted in the inhibition of floral initiation in cocklebur. Irradiations inducing different relative levels of P(FR) from 1 to 2% to 80% had about the same effect under 4-hour photoperiods. The lower levels of P(FR) induced by continuous far red irradiation were not as effective as the higher levels induced by red ...
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It has been shown previously ( 15) that photoperiodic induction in Xanthium is inhibited by application of the pyrimidine, 5-fluorouracil (5-FU). More recently (1) it has been demonstrated that the process which is inhibited by 5-FU and which is related to the process of flowering, is the synthesis of ribonucleic acid (RNA) in the Xanthium bud during the first part of the inductive dark period....
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