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  • 1
    Electronic Resource
    Electronic Resource
    Paraquat tolerant and susceptible perennial ryegrasses: effects of paraquat treatment on carbon dioxide uptake and ultrastructure of photosynthetic cells (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 3 (1980), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Paraquat treatment of susceptible Lolium perenne seedlings (cultivar Kent Indigenous) rapidly inhibited CO2 uptake and after 1 h chloroplasts exhibited abnormal fusions of the thylakoid membranes. Further ultrastructural changes occurred within the chloroplasts until 8 h after treatment, when cytoplasmic damage also became evident. The localization of primary damage within the chloroplast differs from previous reports of paraquat toxicity in other species. Paraquat treatment of tolerant L. perenne seedlings (line PRP IX) resulted in little change in CO2 uptake and ultrastructural effects were generally confined to the gradual development of deposits in the chloroplast stroma. These observations are discussed in relation to the mechanism of action of the herbicide and the proposed mechanism of paraquat tolerance in L. perenne.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11580909
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  • 2
    Electronic Resource
    Electronic Resource
    Inhibition of somatic embryo maturation in Sitka spruce [Picea sitchensis (Bong.) Carr.] by butylated hydroxytoluene, a volatile antioxidant released by parafilm (1996)
    Springer
    Plant cell reports 16 (1996), S. 192-195 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Head-space volatiles above embryogenicPicea sitchensis (Bong.) Carr. (Sitka spruce) tissues cultured in glass Petri dishes sealed with Parafilm M or cling-film, were captured on Tenax adsorption traps and analysed by gas chromatography / mass spectrometry. Each sealing system released a single major compound into the head-space; butylated hydroxytoluene from Parafilm M and 2-ethyl-1-hexanol from cling-film. After two weeks sealed under Parafilm M butylated hydroxytoluene accumulated to 1.1 μg g−1 FW in tissues and subsequent somatic embryo maturation was prevented. When butylated hydroxytoluene was supplied via the head-space (100 μg/250 ml flask) 0.5 μg g−1 FW accumulated in tissues after two weeks and no somatic embryo maturation occurred. Potentially phytotoxic metabolites of butylated hydroxytoluene included a substituted stilbenequinone, butylated hydroxytoluene quinone methide and butylated hydroxytoluene dimer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01890865
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  • 3
    Electronic Resource
    Electronic Resource
    The effects of flooding on the export of gibberellins from the root to the shoot (1969)
    Springer
    Planta 89 (1969), S. 376-379 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Gibberellin (GA)-like substances are shown to be present in the bleeding sap of tomatoes. It is demonstrated that these substances can promote stem elongation in intact tomato plants. Waterlogging of the root system inhibits stem growth and severely reduces the export of GAs from the root to the shoot in the xylem sap. It is suggested that decline in growth rate following waterlogging may, in part, be due to the reduction in the supply of GAs to the shoot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387239
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  • 4
    Electronic Resource
    Electronic Resource
    A Study of the graft union in in vitro micrografted apple (1996)
    Springer
    Plant growth regulation 20 (1996), S. 17-23 
    Details
    ISSN: 1573-5087
    Keywords: Bramley's Seedling ; MM106 ; M9 ; M25 ; in vitro grafting ; graft union formation ; vascular regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Light microscopy was used to study graft union formation in in vitro micrografts of tissue cultured apple (Malus domestica. Borkh). Micrografts were constructed using horizontal incisions to form the grafting surface, and placing the cut ends of rootstock and scion into sterile silicon tubing to permit graft formation to occur. The outer morphological and histological development was similar for different stock-scion micrograft combinations but graft union formation was slower in heterografts than in autografts. Initial leaf expansion at the scion shoot apex occurred in all micrografted plantlets within 1–4 days and was not indicative of graft success. Progressive scion growth and development could be used as an indication of graft success by ten to fourteen days after grafting and probably was related to establisment of cell to cell contact at the graft interface. Microscopy showed initiation of callus proliferation in the vascular cumbium and the pith ten days after grafting. Differentiation was observed subsequently and this was reflected in scion development. Longitudinally orientated cambial cells began to differentiate between twenty and forty days after grafting, and formed a bridge between the vascular cylinders of scion and rootstock. The scions at this stage had as many as eight newly expanded leaves and micrografts were strong enough to permit silicon sleeve removal without damage. Continuity of new vascular elements in rootstock and scion was established around forty days. New vascular elements curved slightly in towards the pith to form a ‘c’ shaped bridge across the graft union. Vascular development continued until it reached completion after six months.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024052
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  • 5
    Electronic Resource
    Electronic Resource
    The influence of culture vessel head-space volatiles on somatic embryo maturation in Sitka spruce [Picea sitchensis (Bong.) Carr.] (1996)
    Springer
    Plant growth regulation 20 (1996), S. 37-42 
    Details
    ISSN: 1573-5087
    Keywords: Picea sitchensis ; somatic embryogenesis ; ethylene ; parafilm ; potassium permanganate ; adsorption agents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The maturation of somatic embryos of Sitka spruce [Picea sitchensis (Bong.) Carr.] was found to be highly dependent on the method used to seal plastic Petri dishes. Large numbers of well-formed mature embryos developed if dishes were sealed with PVC cling-film (CF) whilst sealing with Parafilm M (PF) greatly reduced the numbers of embryos forming. Inclusion of potassium permanganate oxidation traps, normally used to deplete the atmospheric ethylene, greatly stimulated somatic embryo maturation under PF sealing. Similarly, traps of adsorption agents (Tenax, activated charcoal or soft white paraffin), capable of removing volatiles from the culture vessel head-space, stimulated somatic embryo maturation under PF sealing although to a lesser extent than the oxidation traps. Incorporation of silver nitrate or 2-chloroethylphosphonic acid (ethephon) in the culture medium indicated that ethylene was not the agent supressing somatic embryo maturation under PF sealing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024055
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  • 6
    Electronic Resource
    Electronic Resource
    An improved method for callus proliferation and regeneration of Fuchsia hybrida (1990)
    Springer
    Plant cell, tissue and organ culture 22 (1990), S. 17-20 
    Details
    ISSN: 1573-5044
    Keywords: Fuchsia hybrida ; callus culture ; regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Best callus initiation was obtained when single-node explants of Fuchsia hybrida were incubated in the light on Gamborg B5 medium containing 5×10-6 M indoleacetic acid and benzylaminopurine at 5×10-7 M or 10-6 M. Healthy callus proliferation was maintained in darkness on full-strength B5 medium supplemented with 5×10-6 M IAA and 5×10-7 M BAP. Regeneration from callus was obtained in 3 to 6 weeks, using half-strength hormone-free Campbell & Durzan medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00043693
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  • 7
    Electronic Resource
    Electronic Resource
    The use of growth retardants to improve microtuber formation by potato (Solanum tuberosum) (1991)
    Springer
    Plant cell, tissue and organ culture 27 (1991), S. 59-64 
    Details
    ISSN: 1573-5044
    Keywords: ancymidol ; chlormequat ; daminozide ; microtuber ; paclobutrazol ; Solanum tuberosum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The growth retardant chlormequat stimulated microtuber formation by a recalcitrant cultivar of potato (Solanum tuberosum), but reduced microtuber fresh weight in a cultivar that tuberised readily in its absence. Inhibition of microtuber growth by high concentrations of chlormequat was confirmed using a different in vitro system where all cultivars tuberised in the absence of growth retardants. Alternative growth retardants were tested. Daminozide also had a detrimental effect on microtuber fresh weight, but ancymidol and paclobutrazol did not inhibit microtuber growth at the concentrations required for stimulation of tuberisation by recalcitrant cultivars. In addition, 10-5 M ancymidol and paclobutrazol inhibited premature sprouting of microtubers in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00048207
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  • 8
    Electronic Resource
    Electronic Resource
    Glycoalkaloid accumulation during tuber development of early potato cultivars (1998)
    Springer
    Potato research 41 (1998), S. 117-125 
    Details
    ISSN: 1871-4528
    Keywords: α-solanine ; α-chaconine ; C:S ratio ; glycoalkaloid content ; tuber size ; individual tubers ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Plants of early potato cultivars were sampled at successive harvests during tuber development and individual tubers were analysed for α-solanine and α-chaconine using high-performance liquid chromatography. Mean tuber total glycoalkaloid concentration (α-solanine plus α-chaconine) per plant decreased with time and statistically significant differences between cultivars were observed in the patterns of decline during tuber growth. The mean tuber ratio of α-chaconine to α-solanine increased during tuber development and was also affected by genotype. Total glycoalkaloid concentration for individual tubers of marketable sizes (up to 50 g fresh weight) exceeded the safety limit of 20 mg per 100 g fresh weight for cultivars Home Guard and British Queen but not for Rocket. These differences were attributable to differences in both rates and patterns of glycoalkaloid accumulation during tuber development, although in all cultivars results were consistent with glycoalkaloid accumulation occurring in the expanding peripheral cell layers of tubers for a considerable period after tuber initiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358434
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  • 9
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    The effects of flooding on the export of gibberellins from the root to the shoot (1969)
    Springer
    Details
    Publication Date: 1969-01-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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  • 10
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    Paraquat tolerant and susceptible perennial ryegrasses: effects of paraquat treatment on carbon dioxide uptake and ultrastructure of photosynthetic cells (1980)
    Wiley
    Details
    Publication Date: 1980-04-01
    Print ISSN: 0140-7791
    Electronic ISSN: 1365-3040
    Topics: Biology
    Published by Wiley
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