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  • 1985-1989  (6)
  • 1955-1959  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Endogenous ion currents traverse growing roots and root hairs of Trifolium repens (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 9 (1986), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The patterns of naturally growing ion currents associated with horizontally growing roots of Trifolium repens L. seedlings were measured in a simple low-salt bathing medium using a highly sensitive vibrating electrode. Current consistently enters the main elongation zone of the root and leaves from mature, elongated tissue. This current enters and leaves with densities of ca. 4.0–11.0 mA m−2 and 4.0 mA m−2, respectively. Current was also delected entering the zone of emerging root hairs and also the root-hair tips themselves.These results are a further example of the involvement of self-generated electrical fields in plant developmental processes. Possible, secondary rhizosphere-associated effects of the extracellular loop of the developmental current are also suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11614353
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Water balance of N2-fixing root nodules: Can phloem and xylem transport explain it? (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 12 (1989), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Analysis of nodule inputs via the phloem and outputs via the xylem leads to the conclusion that water fluxes along those conduits alone would give a xylem sap osmolality in excess of that of sieve tubes and would thus plasmolyse the latter unless N2 fixation involved a very high respiratory consumption of organic C entering in the phloem, or there is significant water influx from soil through the nodule surface. Whether N2 fixation by attached nodules not in contact with an external water supply is energetically inefficient (and hence also, at a whole plant level, inefficient in terms of water-use) is as yet untested. However, the hypothesis which we prefer involves the shortfall in water entry via the phloem being made up the parenchymatic water flux from the root to the nodule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1989.tb01628.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Gibberellic Acid and the Physiological Genetics of Flowering in Peas (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 1321-1322 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Brian and Hemming2 have shown that segregation at the Le locus affects some aspect of the metabolism of the gibberellins. In view of the over-lapping pleiotropic effects of segregation at the Le and Sn loci, we have made an investigation of the effect of gibberellic acid on flowering in the four ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1821321a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of sodium chloride and polyethylene glycol on root-hair infection and nodulation of Vicia faba L. plants by Rhizobium leguminosarum (1986)
    Springer
    Planta 167 (1986), S. 303-309 
    Details
    ISSN: 1432-2048
    Keywords: Nodulation ; Root hair infection ; Salt stress ; Victa-Rhizobium symbiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of sodium chloride and polyethylene glycol (PEG) on the interaction between Rhizobium leguminosarum strain 29d and root hairs of field bean (Vicia faba L. cv. Maris Bead) plants were investigated. Two levels each of NaCl (50 and 100 mol·m−3) and PEG (100 and 200 mol·m−3) were given at the time of root-hair formation. Scanning electron microscopy showed rhizobial attachment and colonization on root-hair tips. Adhesion of rhizobia in both lateral and polar orientation, sometimes associated with microfibrils, occurred mainly in crooks at the root-hair tips; most of the infections also occurred here. Bacterial colonization and root-hair curling were both reduced by stress treatments. Polyethylene glycol but not NaCl significantly reduced root-hair diameter. The proportion of root hairs containing infection threads was reduced by 30% under NaCl and by 52% under PEG. The structure of some of the root hairs, epidermal and hypodermal cells, as seen by light microscopy in ultrasections, was distorted as a result of NaCl and PEG treatments; cells showed plasmolysis and folded membranes. After three weeks of treatment, both NaCl and PEG inhibited nodule number by about 50% and nodule weight by more than 60%. It is concluded that the root-hair infection process in Vicia faba is impaired by NaCl and PEG treatments and this in turn results in fewer nodules being produced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391332
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanisms of infection of plants by nitrogen fixing organisms (1988)
    Springer
    Plant and soil 110 (1988), S. 157-165 
    Details
    ISSN: 1573-5036
    Keywords: cell wall ; Frankia ; infection ; legume ; non-legume ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Heterotrophic nitrogen-fixing microorganisms can enter plants via wounds, root hairs or intact epidermises. All at some stage need the ability to digest primary cell walls and/or middle lamellas. None appears to digest secondary walls. The ability of any organism to infect a particular plant reflects (a) the enzymes produced by the microorganism (and possibly, as part of its reaction, the plant); (b) the exact nature of the primary wall; (c) the distribution of secondary walls. Plants may respond to infection by hypersensitive and other reactions which could be triggered by production of cell wall fragments. Infection threads of secondary wall material may be essential for root hair infection and where cell boundaries are crossed. Entry into host cells other than by infection threads involves a delicate balance between endophyte and host. This may only be achieved in one or a few cells, which may then divide repeatedly to produce a symbiotic structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02226795
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Early growth and final yield of autumn sownVicia faba L cultivars given different forms of fertiliser N over winter (1986)
    Springer
    Plant and soil 96 (1986), S. 421-427 
    Details
    ISSN: 1573-5036
    Keywords: Fertilizer nitrogen ; Field bean ; Low temperature growth ; Vicia faba
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Between 3 Nov. 1983 and 9 Apr. 1984, six applications of fertiliser N (ammonium, nitrate or urea) were given to four autumn sown (26 Oct. 1983)Vicia faba L cultivars, Banner Winter (BW) and Maris Beagle (MBg), cold tolerant cultivars normally sown in the autumn, and Herz Freya (HF) and Maris Bead (MBd), cold sensitive cultivars more commonly sown in the spring. The effects of additional N were determined by comparison with plants given zero-N (controls). Application of N, regardless of form, had no effect on % emergence at the first sampling (15 Dec. 1983); 〉90% for BW, MBg and HF, but only 40–60% for MBd. At this time the dry weight, carbon content and nitrogen content of all cultivars was approximately 20% less than that of the seed on planting. No more plants emerged after 15 Dec. 1983. Between 15 Dec. 1983 and 20 Feb. 1984, all cultivars, regardless of N treatment, showed little change in dry weight, carbon content and nitrogen content but the proportion of total plant dry weight, carbon content and nitrogen content in the cotyledons decreased while the proportions in root, stem and leaf tissue increased. On 20 Feb. 1984 there were no N effects. All cultivars but especially BW and MBg, showed progressive increases in dry weight, carbon content and nitrogen content during the period 20 Feb. 1984 to 8 May 1984. Pooled results for all four cultivars indicated that on 8 May 1984, plants given ammonium and urea had a greater dry weight, carbon content and nitrogen content than controls. At harvest (1–3 Sep. 1984), BW and MBg outyielded (g dw seed m−2) HF and MBd. Pooled results for all cultivars indicated that application of N regardless of form gave increased yield and an increased N concentration (mg N g−1 dw) in the seed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375147
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Nodulation of legume trees from South East Brazil (1987)
    Springer
    Plant and soil 99 (1987), S. 347-356 
    Details
    ISSN: 1573-5036
    Keywords: Legume ; Nodule ; Rhizobium ; Tree
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary An extended survey of nodulation of legume trees from South-East Brazilian forests was conducted. Six new species from the Caesalpinioideae, 23 from the Mimosoideae and 27 from the Papilionoideae are reported to have nodules. Nitrogenase activity (acetylene reduction) was tested for all nodules and rhizobia were isolated from the most active.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370880
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