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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Planta 82 (1968), S. 22-32 
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Samples of sieve-tube sap were obtained as honeydew from aphids feeding on three species of higher plants. The honeydew was extracted, chromatographed and tested in several bioassays for the presence of gibberellin-like substances. The bioassay results indicated that gibberellin-like substances were translocated in the phloem of dandelion (Taraxacum officinale), broad bean (Vicia faba) and willow (Salix viminalis). Results obtained with willow showed that the concentration of gibberellin-like substances in the sieve-tube sap is daylength dependent, high levels being present in plants maintained under long days and low levels in short day plants.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Planta 89 (1969), S. 108-125 
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Considerable two-way interchange of label derived from 14C-GA3 and 14C-kinetin has been shown to occur between the xylem and extra-cambial tissue of Salix viminalis L. Radial translocation of both growth substances from the transpiration stream to the sieve-tube sap has been demonstrated by the use of an aphid technique. This is the first record of the bark-xylem interchange of these two growth hormones. A high percentage of 14C-label is present in compounds other than GA3 and kinetin 8 hours after application. Mechanisms of lateral transfer are discussed together with their possible physiological significance.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary It is shown that there is one growth inhibitor in the phloem sap and two in the xylem sap of willow (S. viminalis L.). The concentration of the inhibitor in the phloem sap, (+)-abscisic acid, increases as the plants enter dormancy. This is also shown for (+)-abscisic acid in the xylem sap, but the concentration of the second inhibitor decreases in a reciprocal manner.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 220 (1968), S. 86-87 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1. CONDITIONS FOR GLC OF ABSCISIC ACID Hewlett Packard, F and M 402 high efficiency Dual, 6' x g"i.d. glass, U shaped 1-5% Q.F.I coated on A.W.-D.M.C.S. 'Chromosorb W N2 40 ml. min-1 Gas Chromatography Columns Packing Carrier gas Flame ionization detector Injection temperature ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Planta 99 (1971), S. 120-132 
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The effect of IAA and three synthetic auxins on the upward movement of 32P-orthophosphate and 14C-sucrose has been investigated in decapitated stems of Phaseolus vulgaris L., Pisum sativum L., Coleus blumci L. and Helianthus annuus L. IAA greatly enhanced the accumulation of 32P-orthophosphate in Phaseolus vulgaris and Pisum sativum, whereas in C. blumei and H. annuus it did not. 2,4-D like IAA, caused an increase in 14C-sucrose and 32P-orthophosphate accumulation in Phaseolus vulgaris but, unlike IAA, caused no increase in Pisum sativum. The downward transport of 14C-IAA, 14C-NAA, 14C-2,4-D and 14C-2,4,5-T from the decapitated apex was also studied. Results are discussed in terms of current theories of hormone-directed transport.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 58 (1991), S. 159-164 
    ISSN: 1570-7458
    Keywords: Fecundity ; Heliothis zea ; oviposition ; Spodoptera ornithogalli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La production d'œufs d'Heliothis zea (Boddie) et de Spodoptera ornithogalli Guenée (Lepidoptera: Noctuidae) durant toute la vie adulte a été examinée au laboratoire. Bien que H. zea dépose ses œufs isolément et que S. ornithogalli les dépose en groupes, les courbes temporelles d'oviposition chez des individus fécondés sont similaires. Le nomber d'œufs culmine peu après l'accouplement, puis décline rapidement. Le poids des œufs culmine aussi peu après l'accouplement, puis décroît graduellement. Des femelles fécondées produisent environ deux fois autant d'œufs que les femelles non fécondées, quoique la longévité ne diffère pas significativement entre les deux groupes. Des femelles non fécondées montrent des distributions temporelles plus irrégulières que des femelles fécondées, en ce qui concerne le nombre des œufs et leur poids. Ces irrégularités ont été attribuées à la tendance des femelles non fécondées à retenir leur œufs, ce qui suggère que l'accouplement exerce une influence sur la forme de la courbe temporelle d'oviposition. Des femelles d'H. zea contenant un, deux ou trois spermatophores n'ont pas produit des nombres d'œufs significativement différents.
    Notes: Abstract Egg production under laboratory conditions was examined over the lifespan of Heliothis zea (Boddie) and Spodoptera ornithogalli Guenée (Lepidoptera: Noctuidae). Although H. zea oviposits singly and S. ornithogalli oviposits in masses, temporal trends were similar. Egg numbers peaked shortly after mating and then rapidly declined. Egg weights also peaked shortly after mating, but decreased gradually over time. Temporal oviposition patterns were more erratic for unmated than mated females, suggesting the importance of mating in establishing the shape of the oviposition curve.
    Type of Medium: Electronic Resource
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