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  • 1
    Electronic Resource
    Electronic Resource
    Uniconazole-induced thermotolerance in wheat seedlings is mediated by transpirational cooling (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 81 (1991), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Seed treatment of thermotolerant and sensitive cultivars of wheat (Triticum aestivum L. cv. Frederick and Glenlea, respectively) with uniconazole reduced shoot and increased root fresh and dry weights. When subjected to 48°C for 6 h, treated seedlings had lower leaf-temperatures and overall higher rates of evapotranspiration. Percent survival 11 days after high temperature incubation in untreated seedlings was 53% in Frederick and 30% in Glenlea, whereas in uniconazole-treated seedlings it was 94% and 80%, respectively. Transpiration resistance markedly increased in the control cultivars after 4 h of high-temperature incubation, but remained relatively unchanged in the treated cultivars. The increased root to shoot ratio exhibited in treated plants may have alleviated guard cell stress, even under high evaporative demand. Chlorophyll fluorescence measurements on leaves of heat-stressed seedlings indicated that increased photosynthetic metabolism in treated seedlings was correlated with lower leaf temperatures. High-temperature stress resulted in a dramatic decline in pigments and proteins in thylakoid extracts of control seedlings but not in extracts from treated seedlings. Integrity of thylakoid pigment protein complexes, as illustrated by reduced relative amounts of free pigment, was maintained after exposure to high temperatures in treated seedlings. Furthermore, the treated Glenlea seedlings displayed a reduction in the monomeric form of Sight-harvesting chlorophyll protein II (LHCP II) compared to control and Frederick seedlings. The heat-tolerant Frederick cultivar showed a greater protective effect from uniconazole treatment than the sensitive Glenlea cultivar. Uniconazole treatment did not affect heat-shock protein (HSP) synthesis in mesocotyl tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1991.tb08741.x
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Benzyladenine on Bean Leaf Senescence and the Translocation of 14C-Assimilates (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 23 (1970), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Treating primary leaves of bean plants with benzyladenine (BA) greatly increased the retention of photosynthetic assimilates in the treated leaves. Within 24 hours of treatment, the BA treated primary leaves retained 70 % of their assimilates and maintained this high level throughout the period studied. In contrast, the primary leaves of control plants retained 30 % at week 2, increased retention to 80 % between week 4 and 5 and dropped to 50 % during senescence at week 6. When the trifoliate leaves of 5 week old plants were fed 14CO2, less than 1 % of the total activity was recovered from the BA treated leaves. It is concluded that the retardation of leaf senescence by BA on intact plants is not due to mobilization of metabolites from other plant parts, but is associated with a high retention of photosynthates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1970.tb08891.x
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  • 3
    Electronic Resource
    Electronic Resource
    Triadimefon stimulates rooting in bean hypocotyl (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 73 (1988), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Triadimefon, a broad spectrum fungicide and an inhibitor of gibberellic biosynthesis, whitened, thickened, and shortened the roots of bean (Phaseolus vulgaris L. cv. Spring Green) seedlings and stimulated the development of root primordia along the hypocotyl. In a comparative study, triadimefon, IAA, spermidine, putrescine and spermine all stimulated adventitious root growth, but triadimefon was more effective than the other 4 compounds. Equimolar concentrations of gibberellic acid (GA3) completely eliminated the stimulatory effect of triadimefon. Stimulation of root development by triadimefon was accompanied by inhibition of ethylene biosynthesis followed by removal of basal dominance and an increase in polyamine levels, both of which occurred after rooting had begun. Although triadimefon was effective in stimulating rooting, its mechanism of action is apparently not mediated via the control of ethylene and polyamine biosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1988.tb00617.x
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  • 4
    Electronic Resource
    Electronic Resource
    Improvement of uniconazole-induced protection in wheat seedlings (1990)
    Springer
    Journal of plant growth regulation 9 (1990), S. 207-212 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Uniconazole [(E)-(p-chlorophenyl)-4, 4-dimethyl-2-(1,2,4-triazol-1 -yl)-1 -penten-3-ol] belongs to a group of triazoles which, in addition to their fungitoxic and plant growth-regulating (PGR) properties, protect plants from various stresses. Compared to the conventional methods of treatment which include seed, soil drench, and foliar spray, the present study shows that a convenient and simple method of administering the chemical is by imbibing wheat (Triticum aestivum L. cv. Frederick) seeds in uniconazole solution for 20 h. The soaked seeds can be stored after air drying and germinated when desired. Addition of potassium to the uniconazole solution and exposure of the seeds to 40°C for the last 2 h during the imbibition period further enhanced the PGR effectiveness and improved the efficacy of the uniconazole-induced protection against drought and low- and high-temperature stresses. Uniconazole increased both carotenoid and chlorophyll levels and in combination with KCl, the increase in chlorophyll was more than twice that of the controls. The combination pretreatment of the imbibed seeds used in this study not only magnifies the protective and PGR effects of uniconazole but also supports the concept of acclimation and cross-tolerance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041964
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  • 5
    Electronic Resource
    Electronic Resource
    Uniconazole-induced changes in abscisic acid, total amino acids, and proline in Phaseolus vulgaris
    Amsterdam : Elsevier
    Pesticide Biochemistry and Physiology 37 (1990), S. 74-82 
    Details
    ISSN: 0048-3575
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0048-3575(90)90110-N
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  • 6
    Electronic Resource
    Electronic Resource
    Photocycloaddition reactions of the first stable thioaldehyde: 2,4,6-tri(tert-butyl)thiobenzaldehyde with substituted allenes
    Amsterdam : Elsevier
    Tetrahedron Letters 25 (1984), S. 873-876 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(01)80050-2
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of temperature on the gas exchange of leaves in the light and dark (1969)
    Springer
    Planta 85 (1969), S. 228-237 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Evolution of CO2 into CO2-free air was measured in the light and in the dark over a range of temperatures from 15 to 50°. Photosynthetic rates were measured in air and O2-free air over the same range of temperatures. Respiration in the light had a different sensitivity to temperature compared with respiration in the dark. At the lower temperatures the rate of respiration in the light was higher than respiration in the dark, whereas at temperatures above 40° the reverse was observed. For any one species the maximum rates of photosynthesis and photorespiration occur at about the same temperature. The maximum rate for dark respiration generally is found at a temperature about 10° higher. Zea mays and Atriplex nummularia showed no enhancement of photosynthesis in O2-free air nor any evolution of CO2 in CO2-free air at any of the temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389400
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  • 8
    Electronic Resource
    Electronic Resource
    A comparative study of translocation of assimilated14C from leaves of different species (1969)
    Springer
    Planta 88 (1969), S. 103-112 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Translocation of assimilated14C from the leaves of different species varied both in the rate of export and in the total percentage moved out. Those species which are known to have high photosynthetic rates, such as the tropical grasses sorghum and millet, exported 70% or more of the assimilated14C during the first 6 h after assimilation, compared to values of 45 to 50% for tomato, castor bean,Nicotiana affinis and soybean. The compounds in which the14C was retained in the leaves varied from species to species. Except for castor bean only small amounts were retained in sucrose, with generally much higher amounts in fructose, glucose and malic acid. Most of the14C was retained in the ethanol-insoluble fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01391116
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  • 9
    Electronic Resource
    Electronic Resource
    Ozone effects on growth of radish plants as influenced by nitrogen and phosphorus nutrition and by temperature (1973)
    Springer
    Plant and soil 39 (1973), S. 437-439 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Raphanus sativus L. (radish) plants were grown in sand culture at two temperatures and fed with nutrient solutions containing relatively low or high levels of either N or P. At the 4-leaf stage, the plants were exposed to ozone at a concentration of 25 pphm for 4 h. Ozone treatments resulted in decreased dry weight of low- and high-N plants at both temperatures and of low and high P plants only at the lower temperature. The study showed that air pollutant growth reduction is not necessarily accentuated by luxuriant growth resulting from high nutritional status. Responses to the nutrition of specific mineral nutrients depend on the modifying effect of temperature. re]19720524
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014811
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  • 10
    Electronic Resource
    Electronic Resource
    Uniconazole reduces ethylene and 1-aminocyclopropane-1-carboxylic acid and increases spermine levels in mung bean seedlings (1989)
    Springer
    Journal of plant growth regulation 8 (1989), S. 45-51 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Uniconazole reduced growth of etiolated mung bean seedlings and increased lateral root formation. Ethylene production for whole seedlings was reduced by 80% within 24 h after treatment and 1-aminocyclopropane-1-carboxylic acid concentrations were reduced by approximately 40% in 12 h. Uniconazole treatment increased spermine levels by 100% by day 4, whereas spermidine and putrescine levels were not affected. Uniconazole, by inhibiting ethylene synthesis, may be increasing spermine levels, which in turn stimulate formation of root primordia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02024925
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