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  • 1
    Electronic Resource
    Electronic Resource
    Effects of irrigation regimes on the yield and water use of strawberry (1992)
    Springer
    Irrigation science 13 (1992), S. 45-48 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Strawberry plants (Fragaria x annanasa D. cv Chandler) were grown in field plots and in drainage lysimeters under controlled soil moisture regimes. Four irrigation treatments were established by watering the plants when soil water potential reached -0.01, -0.03,-0.05 and -0.07 MPa. The maximum yield was attained at -0.01 MPa soil water potential. Differences in yield were caused by both changes in the number of fruits per plant and in the fresh weight per fruit. Yield reductions were associated with reductions in total assimilation rate resulting from the decreased assimilatory surface area in plants irrigated at lower soil water potentials. The crop water production function calculated on a fruit fresh weight basis resulted in a yield response factor (K y) of 1.01.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190244
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of allelochemicals on plant respiration and oxygen isotope fractionation by the alternative oxidase (1996)
    Springer
    Journal of chemical ecology 22 (1996), S. 801-805 
    Details
    ISSN: 1573-1561
    Keywords: Allelopathy ; alternative oxidase ; α-pinene ; cinnamic acid ; juglone ; on-line18O fractionation ; quercetin ; respiration ; soybean
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The goal of this investigation was to determine the effects of allelochemicals on plant respiration that thereby may be responsible for their role in growth inhibition. We have tested the effects of juglone, quercetin, cinnamic acid, andα-pinene on respiration rates, and electron partitioning through the cytochrome and alternative respiratory pathways, by measuring on-line oxygen consumption and oxygen isotope fractionation in soybean cotyledon tissue. Cinnamic acid andα-pinene decreased the oxygen consumption rate and increased the relative partitioning of electron transport to the alternative pathway. Possible biochemical mechanisms of these effects are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02033587
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  • 3
    Electronic Resource
    Electronic Resource
    Altitudinal differences in UV absorbance, UV reflectance and related morphological traits of Quercus ilex and Rhododendron ferrugineum in the Mediterranean region (1999)
    Springer
    Plant ecology 145 (1999), S. 157-165 
    Details
    ISSN: 1573-5052
    Keywords: Altitude ; Carotenoids/chlorophyll a ratio ; Leaf hair density ; Mediterranean region ; NDPI ; PRI ; Quercus ilex ; Rhododendron ferrugineum ; SLW ; Thickness ; UV absorbing compounds ; UV reflectance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We studied the variations in different physiological parameters associated with UV-B radiation defense: UV-B radiation absorbance, UV-visible spectral reflectance, carotenoids concentration, leaf thickness, SLW (specific leaf weigth) and trichome density in Quercus ilex growing at 200 and 1200 m and Rhododendron ferrugineum growing at 2200 m. We examined the role of these parameters as protection mechanisms in an altitudinal gradient of increasing UV radiation in northern Catalonia and in sun and shade leaves. The concentration of UV-B radiation absorbing pigments was 15% higher in sun leaves of Q. ilex at 1200 m than in those from 200 m altitude. Sun leaves of R. ferrugineum presented concentrations three times higher than those of Q. ilex. Reflectance ranged between 5% (in the region 300–400 nm) and 12% (in the region 280–300 nm). The variation of reflectance with altitude followed an inverse trend respect to absorbance in the 280–300 nm region, with higher values the lower the altitude, but in the 300–400 nm region, reflectance of the lower site was the lowest. In both species and altitudes sun leaves presented higher concentrations of UV-B radiation absorbing pigments and UV reflectance than shade leaves. Quercus ilex trees of the higher location presented higher NDPI (Normalized Difference Pigment Reflectance Index) values, indicating higher carotenoids/chlorophyll a ratio. Actual measurements of carotenoid/chlorophyll a ratio confirmed this pattern. The photochemical reflectance index (PRI) presented higher values the higher the location indicating lower photosynthetic radiation-use efficiency. Specific leaf weight (SLW) and leaf thickness were larger in Q. ilex trees of higher location than in those of lower location. In both sites, sun leaves also presented larger SLW values than shade leaves. Adaxial leaf hair density in sun leaves was significantlly higher in the lower location. UV absorption and linked morphological traits (SLW, leaf thickness measured in Q. ilex) presented the larger differences among studied plants at different altitudes and seem to be the dominant UV protecting mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009826803540
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  • 4
    Electronic Resource
    Electronic Resource
    Remote Sensing of Biomass and Yield of Winter Wheat under Different Nitrogen Supplies (2000)
    Springer
    Crop science 40 (2000), S. 723-730 
    Details
    ISSN: 1435-0653
    Keywords: ANCOVA, analysis of covariance ANOVA, analysis of variance Chl, chlorophyll DAS, days after sowing FAPAR, fractional absorbed PAR fIPAR, fractional intercepted PAR LAI, leaf area index LAI × Chl A, canopy chlorophyll A content NDVI, normalized difference vegetation index NIR, near-infrared PAR, photosynthetic active radiation RUE, radiation use efficiency SEM, standard error of the mean SR, simple ratio VI, vegetation indices ΣSR, cumulative simple ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Triticum aestivum L.) crop growing under different N supplies. Nitrogen fertilization promoted significant increases in radiation interception (plant growth) and, to a lesser extent, in radiation use efficiency (RUE). The VI vs. LAI relationships varied significantly among treatments, rendering the VI-based equations unreliable to estimate LAI under contrasting N conditions. However, a single relationship emerged when LAI × Chl A was considered. Moreover, VI were robust indicators of fIPAR by green canopy components independently of N treatment and phenology. Aboveground biomass was poorly correlated with grain yield, whereas cumulative VI simple ratio (SR) was a good predictor of grain yield, probably because cumulative SR closely tracked the duration and intensity of the canopy photosynthetic capacity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of Carbon Dioxide, Water Supply, and Seasonality on Terpene Content and Emission by Rosmarinus officinalis (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 979-993 
    Details
    ISSN: 1573-1561
    Keywords: Terpenes ; α-pinene ; camphor ; borneol ; cineole ; emission ; carbon-based secondary compounds ; biomass ; nitrogen ; water ; carbon dioxide concentrations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Rosmarinus officinalis L. plants were grown under carbon dioxide concentrations of 350 and 700 μmol/mol (atmospheric CO2 and elevated CO2) and under two levels of irrigation (high water and low water) from October 1, 1994 to May 31, 1996. Elevated CO2 led to increasingly larger monthly growth rates than the atmospheric CO2 treatments. The increase was 9.5% in spring 1995, 23% in summer 1995, and 53% in spring 1996 in the high-water treatments, whereas in low-water treatments the growth response to elevated CO2 was constrained until the second year spring, when there was a 47% increase. The terpene concentration was slightly larger in the elevated CO2 treatments than in atmospheric CO2 treatments and reached a maximum 37% difference in spring 1996. There was no significant effect of water treatment, likely as a result of a mild low water treatment for a Mediterranean plant. Terpene concentration increased throughout the period of study, indicating possible age effects. The most abundant terpenes were α-pinene, cineole, camphor, borneol, and verbenone, which represented about 75% of the total. No significant differences were found in the terpene composition of the plants in the different treatments or seasons. The emission of volatile terpenes was much larger in spring (about 75 μg/dry wt/hr) than in autumn (about 10 μg/dry wt/hr), partly because of higher temperature and partly because of seasonal effect, but no significant difference was found because of CO2 or water treatment. The main terpene emitted was α-pinene, which represented about 50% of the total. There was no clear correlation between content and emission, either quantitatively or qualitatively. More volatile terpenes were proportionally more important in the total emission than in total content and in autumn than in spring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006383.29650.d7
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  • 6
    Electronic Resource
    Electronic Resource
    Dependence of Ozone Biomonitoring on Meteorological Conditions of Different Sites in Catalonia (N.E. Spain) (1999)
    Springer
    Environmental monitoring and assessment 56 (1999), S. 221-224 
    Details
    ISSN: 1573-2959
    Keywords: biomonitoring ; meteorology ; ozone doses ; tobacco plants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Evaluation of visual symptoms of ozone damage was conducted in the network of bioindicator rural stations of Catalonia (NE Spain) every 14 days from May to October. Damage rates of ozone (and consequently, ozone biomonitoring capacity of bioindicators) were found to vary highly in time and space depending on the local environmental and meteorological conditions. Lower ozone damage to foliage was produced when meteorological conditions favour stomata resistance. Modulatory effects of meteorological conditions need to be considered in biomonitoring and when modeling plant ozone doses and damage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006062613552
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