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  • 11
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1973)
    Springer
    Naturwissenschaften 60 (1973), S. 396-398 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00602528
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  • 12
    Electronic Resource
    Electronic Resource
    Essential Oils as Allelochemicals and Their Potential Use as Bioherbicides (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 1079-1089 
    Details
    ISSN: 1573-1561
    Keywords: Allelochemicals ; carvacrol ; citral ; essential oils ; geranial ; herbicides ; inhibition of germination ; pulegone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Essential oils were extracted from 32 aromatic plants and evaluated for allelopathic properties. The major components of the oils were identified by gas chromatography and GC-MS. Extracts from Origanum syriacum, Micromeria fruticosa, and Cymbopogon citratus were selected for further study. The germination of several species, including wheat, was strongly inhibited by essential oils when applied at 20–80 ppm. Essential oils mixed with the top 0.5 cm of soil inhibited germination of wheat and Amaranthus seeds. This effect depended on the type of soil. The possible use of essential oils as herbicides is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020881825669
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  • 13
    Electronic Resource
    Electronic Resource
    Effect of antitranspirant treatment on the water balance of pine seedlings, under different climatic and soil moisture conditions (1966)
    Springer
    Plant and soil 24 (1966), S. 81-89 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Antitranspirant treatment with ‘Tag’ — a polyethylene based emulsion-reduced transpiration and increased height of potted pine seedlings under simulated hot and dry conditions when soil was moist. Under cool, humid conditions reduction of transpiration was very much less and growth was slightly reduced. Application of antitranspirants to pine seedling transplants, under hot dry field conditions, failed to improve, their water balance or to reduce mortality. Physiological tests made during the field trial and experiments with potted seedlings showed that when the soil is dry xeromorphic plants efficiently reduce their water loss and under such conditions anti-transpirants are of no benefit. It is calculated that antitranspirants would only be advantageous under moist soil and high evaporative demand conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373075
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    Paper (German National Licenses)
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  • 14
    Electronic Resource
    Electronic Resource
    A possible mechanism of high temperature dormancy regulation in seeds of Avena sativa L. (cv. Moyencourt) (1990)
    Springer
    Plant growth regulation 9 (1990), S. 147-156 
    Details
    ISSN: 1573-5087
    Keywords: dormancy ; germination inhibitory factor ; abscisic acid ; gibberellins ; Avena sativa L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Embryos of Avena sativa L. (cv. Moyencourt) show no ‘high temperature dormancy”. The dormancy is induced by the presence of endosperm-aleurone part of the seed. Germination of isolated embryos at 30°C can be prevented by ABA and the inhibition is reversed by GA. Inhibitors of GA synthesis also inhibit embryo germination. The embryos of dormant and non-dormant seeds vary greatly in their sensitivity to exogenous ABA. High temperature dormancy of the entire seeds can be relieved by low concentrations of ethanol. On the basis of these facts a hypothetic model is proposed showing how interaction between endogenous GA and ABA-like inhibitory substance, may regulate the “high temperature dormancy” of the seeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027442
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  • 15
    Electronic Resource
    Electronic Resource
    The effect of chloride and sulphate types of salinity on growth and on osmotic adaptation of pea seedlings (1972)
    Springer
    Plant and soil 36 (1972), S. 449-459 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Germination of pea seeds sown in saline substrate was delayed. The higher the salinity level the longer was the delay. From root protrusion and until the seventh day after sowing the rate of growth of the seedlings was practically unaffected by salinity. From that time on the effect of salinity became more and more apparent. An increase in growth rate of shoots was observed on exposure to −3 to −4 atm of either NaCl or Na2SO4; a slight increase in growth of roots exposed to −3 atm NaCl was apparent. Otherwise increasing levels of NaCl salinity resulted in a reduced growth rate. The effects of sulphate salinity were practically non-significant. Pea plants grown in Na2SO4-salinized media up to 14 days showed a complete osmotic adjustment. This was not the case with plants grown in NaCl-salinized media. Sodium accumulated in the roots of plants exposed to both types of salinity but it was hardly transported into the shoots. Kcontent dropped considerably on exposure to salinity. Chloride accumulated in both roots and shoots. In roots its concentration exceeded that of the external medium and was higher than the concentration of Na + K. The relevance of these results for the explanation of the effect of salinity on growth of the pea seedlings is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373497
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    Paper (German National Licenses)
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  • 16
    Electronic Resource
    Electronic Resource
    The effect of chloride and sulphate types of salinity on growth and on osmotic adaptation of pea seedlings (1972)
    Springer
    Plant and soil 36 (1972), S. 449-459 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Germination of pea seeds sown in saline substrate was delayed. The higher the salinity level the longer was the delay. From root protrusion and until the seventh day after sowing the rate of growth of the seedlings was practically unaffected by salinity. From that time on the effect of salinity became more and more apparent. An increase in growth rate of shoots was observed on exposure to −3 to −4 atm of either NaCl or Na2SO4; a slight increase in growth of roots exposed to −3 atm NaCl was apparent. Otherwise increasing levels of NaCl salinity resulted in a reduced growth rate. The effects of sulphate salinity were practically non-significant. Pea plants grown in Na2SO4-salinized media up to 14 days showed a complete osmotic adjustment. This was not the case with plants grown in NaCl-salinized media. Sodium accumulated in the roots of plants exposed to both types of salinity but it was hardly transported into the shoots. Kcontent dropped considerably on exposure to salinity. Chloride accumulated in both roots and shoots. In roots its concentration exceeded that of the external medium and was higher than the concentration of Na + K. The relevance of these results for the explanation of the effect of salinity on growth of the pea seedlings is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373497
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    Paper (German National Licenses)
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  • 17
    Electronic Resource
    Electronic Resource
    Callus culture from hypocotyls of Kosteletzkya virginica (L.) seedlings (1995)
    Springer
    Plant cell, tissue and organ culture 43 (1995), S. 279-285 
    Details
    ISSN: 1573-5044
    Keywords: Na+ compartmentation ; compatible solutes ; glycine-betaine ; proline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract It was shown that callus established from Kosteletzkya virginica (L.) Presl. (Malvaceae) can grow in salinities higher than 200 mM NaCl if previously accomodated stepwise. Callus lines developed from seedlings of different harvests or of the same harvest at different times, all showed the same pattern of growth and sensitiviy to salinity. The absorption of Na+ into the callus increased with increasing external NaCl concentration. In the callus, Na+ was apparently distributed outside and inside a cellular membrane (possibly the plasmalemma). This membrane was, apparently, capable of regulating the Na+ concentration in the protoplast. Outside this membrane Na+ accumulated to concentrations higher than in the external growth medium. Exogenously supplied proline or glycine-betaine did not affect the growth of the callus. Externally applied ABA stimulated growth under saline conditions and increased the accumulation of proline. Growth and proline content were positively correlated in callus exposed to salinity, but in the presence of ABA they were negatively correlated. ABA was involved in both growth and proline accumulation, but there was no clear relationship between these two effects. Both ABA and proline, if added to the growth medium, improved the appearence of the callus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00039956
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