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  • Springer  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Thermal environment of cotton irrigated using canopy temperature (1994)
    Springer
    Irrigation science 14 (1994), S. 199-205 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The threshold canopy temperature method for controlling a drip irrigation system includes a physiologically based threshold temperature and irrigation application rate that responds to the environment. Energy input from the environment causes canopy temperature to exceed the threshold value and irrigation is then applied. This study evaluated temperature distributions, amount of optimum time, and the amount of irrigation control time for cotton where irrigation scheduling was controlled by different threshold temperatures during the years 1988 to 1991. Optimum time for cotton growth was defined as the accumulated time that canopy temperatures were between 25 and 31 °C and the time accumulated above different threshold temperatures was designated as irrigation control time. Threshold temperatures over a 26 to 32 °C range altered the frequency distribution of temperature within the optimum temperature range (25–31 °C) by reducing temperatures above the threshold. Frequency of canopy temperatures of a 28 °C threshold temperature treatment decreased in the 28 to 29 °C increment and then remained below air temperature. Irrigation control time was more sensitive than optimum time to changes in threshold temperature between 26 and 31 °C. Optimum time and irrigation control time of the 28 °C threshold temperature varied by 37% and 29%, respectively. Lint yields in 1988 and 1990 were high while those in 1989 and 1991 were low because of unfavorable weather. Irrigation amounts applied during DOY 198–273 that were above 20 cm in high yield years or 12 cm in low yield years did not increase yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190191
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  • 2
    Electronic Resource
    Electronic Resource
    Interspecific variation for thermal dependence of glutathione reductase in sainfoin (1990)
    Springer
    Theoretical and applied genetics 79 (1990), S. 600-604 
    Details
    ISSN: 1432-2242
    Keywords: Apparent Km ; Glutathione reductase ; Onobrychis spp. ; Sainfoin ; Thermal kinetic window
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Understanding the biochemical and physiological consequences of species variation would expedite improvement in agronomically useful genotypes of sainfoin (Onobrychis spp.) Information on variation among sainfoin species is lacking on thermal dependence of glutathione reductase (B.C. 1.6.4.2.), which plays an important role in the protection of plants from both high and low temperature stresses by preventing harmful oxidation of enzymes and membranes. Our objective was to investigate the interspecific variation for thermal dependency of glutathione reductase in sainfoin. Large variation among species was found for: (i) the minimum apparent Km (0.4–2.5 μM NADPH), (ii) the temperature at which the minimum apparent Km was observed (15°–5°C), and (iii) the thermal kinetic windows (2°–30°C width) over a 15°–45°C temperature gradient. In general, tetraploid species had narrower (≤17°C) thermal kinetic windows than did diploid species (∼30°C), with one exception among the diploids. Within the tetraploid species, the cultivars of O. viciifolia had a broader thermal kinetic window (≥7°C) than the plant introduction (PI 212241, 〉2 °C) itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226871
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic variability for esterase enzyme in Onobrychis species (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 433-436 
    Details
    ISSN: 1432-2242
    Keywords: Esterase ; Onobrychis spp. ; Polymorphism ; Sainfoin ; Similarity index
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Understanding polymorphism at the enzyme level is basic to its use in population and genetic studies. However, no such information is available on the variability among different sainfoin (Onobrychis) species. Therefore, our objective was to study the existence of genetic polymorphism for esterase in 17 Onobrychis species and three cultivars of O. viciifolia Scop. Three regions of banding were observed in all the materials tested, with the number of bands varying from 0 to 3, 3 to 14, and 1 to 2 bands in each of these zones, which have been designated EST1, EST2, and EST3 respectively. All the materials studied had unique banding patterns, the only common feature being that all of them, except one species, had isozyme 1. Identification was possible only for four species (O. iberica, O. kachetica, O. transcaucasica, and O. bieberstenii) and one cultivar (‘Nova’) based on the banding patterns. Large diversity was evident from the wide range of percent similarity values (0%–79%). Subsequent studies should be directed in using these isozyme banding patterns as markers to the desirable agronomic and quality traits of different germplasm lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226742
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