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  • 1
    Electronic Resource
    Electronic Resource
    2. The role of plant growth regulators in promotion of flowering (1987)
    Springer
    Plant growth regulation 6 (1987), S. 13-35 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00043948
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Quantification of GA1, GA3, GA4, GA7, GA8, GA9, GA19 and GA20; and GA20 metabolism in dormant and non-dormant beechnuts (1997)
    Springer
    Plant growth regulation 22 (1997), S. 29-35 
    Details
    ISSN: 1573-5087
    Keywords: beechnut ; dormancy breaking ; Fagus sylvatica ; gibberellin ; GC-MS-SIM ; seed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The endogenous levels of GA1, GA3, GA4, GA7, GA8, GA9, GA19 and GA20 were determined in beech seeds (Fagus sylvatica L.) treated with different dormancy breaking treatments. Gibberellins were analysed separately in cotyledons and embryo axes. After purification of the extracts, GAs were quantified by GC-MS-selected ion monitoring (GC-MS-SIM) with deuterated GAs as internal standards. The results showed that GAs corresponding to the 13-OH pathway seemed to be involved in dormancy breaking. Strong differences in GA1, GA3, GA8, GA19 and GA20 levels between embryo axes and cotyledons of dormant and non-dormant beechnuts were detected with less pronounced differences for GA4, GA7 and GA9 levels. Both the quantitative differences between dormant and non-dormant seeds in the analysed GAs corresponding to the 13-OH pathway, and the capacity of non-dormant seeds to carry out metabolic conversions when labelled GA20 was injected into the seeds, reveal a dynamic role of GAs in dormancy release.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005814926549
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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