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  • 1985-1989  (1)
  • 1965-1969  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 21 (1968), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Movement of indoleacetic acid (IAA-1-14C) through 5-min segments from stems and roots of Pinus taeda L., P. jeffreyi Gtrev. and Balf., and P. ponderosa Laws, seedlings was measured. All three species showed the same general pattern of IAA-1-14C transport. Predominantly downward movement occurred at all points along the stem and root; least IAA-1-14C transport occurred in segments obtained near the shoot apex; and most occurred in segments obtained near or just below the cotyledons. This pattern of transport gradient is different from that reported in other plants. These results could be interpreted in either of two ways: (1) that transport limitations may control movement of the growth-regulator, or (2) that the transport gradient may be an indication of endogenous growth-regulator levels.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Plant growth regulation 6 (1987), S. 13-35 
    ISSN: 1573-5087
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Research on flowering in forest trees has pursued two main objectives: 1) developing methods for stimulating flowering of selected genotypes to accelerate progeny testing, and 2) hastening the production of genetically-improved seeds in seed orchards. Cultural techniques have been used to some extent in the past for these purposes, but the use of plant-growth regulators (PGRs), particularly the gibberellins (GAs), has been increasingly successful. GAs have been shown to induce flowering in most conifers, but GA application on an operational basis has been worked out for only a few species. GAs have been applied effectively by topical treatment, by stem or branch injections, and by foliar sprays. The timing and concentration of applied chemicals are important and vary from species to species. Another PGR, naphthalene-acetic acid, is synergistic with GAs in some species. Adjunct cultural treatments are often used in combination with treatment with GAs. The success of treatment with GAs is determined to some extent upon the stage of development of the treated plants. The endogenous PGRs regulating flowering are not completely known but it appears that the GAs, the cytokinins, and bascisic acid may all be changed by treatments which induce flowering. Improved techniques becoming available for measuring PGRs are beginning to stimulate research on the endogenous PGRs. The PGRs will continue to play a major role in stimulating flowering in forest trees.
    Type of Medium: Electronic Resource
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