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  • 11
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    Unknown
    Literature (1960)
    London, etc. : Periodicals Archive Online (PAO)
    The Year's work in modern language studies. 22 (1960) 584 
    Details
    ISSN: 0084-4152
    Topics: Linguistics and Literary Studies
    Description / Table of Contents: SERBO-CROAT STUDIES
    Notes: SLAVONIC LANGUAGES
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:0015-1960-022-00-000052
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  • 12
    Electronic Resource
    Electronic Resource
    Effect of nitrogen form on maize response to drought stress (1992)
    Springer
    Plant and soil 144 (1992), S. 191-197 
    Details
    ISSN: 1573-5036
    Keywords: chlorophyll content ; nitrogen form ; water status ; water stress ; Zea mays L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two hybrids of maize (Zea mays L.) differing in resistance to drought, were grown in chernozem soil in a greenhouse and were fertilized with two different forms of nitrogen: Ca(NO3)2 and (NH4)2SO4 in concentrations corresponding to 100 kg of N ha-1. After emergence of the 4th leaf, plants were exposed to drought. During the drought period, the parameters of plant water status (water potential, osmotic potential, turgor pressure and relative water content) and chlorophyll a+b concentration were monitored every two days. N and K concentration and accumulation over the drought period were also monitored. Next to differences in adaptability of the two hybrids to drought, the results demonstrate different adaptability of NH4 and NO3-treated plants within each hybrid. NH4-plants of each hybrid maintain higher turgor pressure during the drought by better osmotic adaptation. Especially significant differences appear between chlorophyll (a+b) values of NH4 and NO3-treated plants and as affected by drought. Chlorophyll concentrations of NH4-plants are higher than those of NO3-plants both in control and droughted plants. NH4 plants show a characteristic initial chlorophyll increase at the beginning of the drought period while in NO3 plants chlorophyll constantly decreases throughout the whole drought period. The influence of the nitrogen form on chlorophyll concentration changes during drought does not appear to be affected by regulation of the K concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012875
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  • 13
    Electronic Resource
    Electronic Resource
    Concentration-dependent influence of quercetin on nodulation process and the main characteristics of soybean inoculated with Bradyrhizobium japonicum (1994)
    Springer
    Plant and soil 166 (1994), S. 243-246 
    Details
    ISSN: 1573-5036
    Keywords: Bradyrhizobium japonicum ; nitrogen content ; nodulation ; plant growth ; quercetin concentration ; soybean
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Soybean plants cv. Corsoy were grown in greenhouse conditions on sterilized quartz sand. They were inoculated with Bradyrhizobium japonicum, strain 542. The plants were treated with different concentrations of quercetin (ranging from 10 nM to 1μM) at regular intervals during the experiment. The experiment was terminated at flower development. The following parameters, important for symbiosis efficiency were determined: shoot, root and nodule weights, nodule number, total leghemoglobin in the nodules,total nitrogen and soluble protein concentrations in shoots and roots, as well as chlorophyll concentration in the leaves. The results obtained partly confirmed the earlier findings that quercetin inhibits nodulation since increasing quercetin concentration decreased the number of nodules. However, at very low concentrations, quercetin stimulated the number of nodules. Quercetin also exerted a stimulating influence on other characteristics of the plant and nodules which did not correlate with nodule number and quantity of N fixed. These are: nodule weight, leghemoglobin concentration, total soluble protein content in shoots and roots as well as shoot and root weight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008337
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