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  • 1
    Electronic Resource
    Electronic Resource
    Response of chrysanthemum to uniconazole and daminozide applied as dip to cuttings or as foliar spray (1994)
    Springer
    Journal of plant growth regulation 13 (1994), S. 115-121 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Uniconazole and daminozide were used as dip on unrooted cuttings or as foliar spray on pinched Dendranthema grandiflora Tzvelev. ‘Dalvina’ to control height. Stem elongation was determined on cuttings dipped in solutions of 0, 1.25, 2.5, 5, or 10 mg/L uniconazole or cuttings were dipped and later treated with foliar sprays in concentrations of 1.25/5, 1.25/10, 2.5/10, and 5/5 mg/L uniconazole, respectively. Other plants were sprayed once or twice with uniconazole at 10 mg/L. Daminozide treatments included a pre-plant dip/foliar spray application of 1000/2000 mg/L, respectively, or two foliar sprays of 2,000 mg/L. Uniconazole dip alone retarded stem elongation linearly up to 8 weeks after propagation, 5 weeks after pinching, but was not discernible from the control treatment 8 weeks after pinching. Uniconazole at 2.5/10 and 5/5 mg/L as a dip/spray combination resulted in plants 33% shorter than the control at the end of the production. Doubling uniconazole dip or spray treatments from 5 to 10 mg/L provided no additional reduction of stem elongation. The single uniconazole spray and both daminozide treatments had no effect on final height, although daminozide treatments reduced stem dry weight compared to the control. Stem dry weight was reduced by uniconazole dip/spray combinations compared to dip treatments alone. Similarly, inflorescence and root dry weights were also reduced by the highest uniconazole concentrations. Higher concentrations of uniconazole reduced transpiration on a per leaf area basis up to 47% compared to the control at the end of production. In contrast to previous work, leaf area and leaf thickness increased with some uniconazole treatments, while time to anthesis was not affected by any of the treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196374
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  • 2
    Electronic Resource
    Electronic Resource
    Melon aphid performance on chrysanthemum as mediated by cultivar, and differential levels of fertilization and irrigation (1998)
    Springer
    Entomologia experimentalis et applicata 88 (1998), S. 41-47 
    Details
    ISSN: 1570-7458
    Keywords: melon aphid ; Aphis gossypii ; fertilizer ; soluble protein ; irrigation ; survivorship ; Dendranthema grandiflora ; chrysanthemum ; cultivar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Population parameters of the melon aphid, Aphis gossypii Glover, were compared for insects grown on six cultivars of chrysanthemum, Dendranthema grandiflora Tzvelev ('Fontana', 'Iridon', 'Pink Lady', 'Splendor', 'White Diamond', and 'White View Time') fertilized with 3 different levels of nitrogen (80, 160 and 240 mg N/l) and 2 levels of irrigation (high 300 ml and low 210 ml every other day). Fecundity, longevity, and survivorship of aphids were significantly affected by the cultivar treatment, but were not affected by irrigation or fertilizer treatments or by any combination of interactions among cultivar, fertilizer and irrigation. Significantly fewer aphids survived on the cultivar 'Pink Lady' (populations reduced by 20.8%) than any other cultivar examined. Intrinsic rates of increase r m , finite rates of increase (R 0), and population doubling times (DT) for aphids were different among fertilizer levels and cultivars, but were not different among irrigation levels. There were no significant fertilizer by irrigation interaction effects upon r m , R 0, or DT. The highest rate of fertilizer applied (240 mg N/liter) adversely affected the intrinsic rate of increase of melon aphids; however, aphid intrinsic rate of increase was weakly correlated with foliar soluble protein levels (r=0.989, P=0.0954). Foliar soluble protein levels were not associated with fertilization treatment. Melon aphids perform consistently better on the cultivars 'White Diamond', 'Fontana', and 'Splendor', relative to those aphids growing on 'Iridon', 'Pink Lady', or 'White View Time'. In general, melon aphids performed best on 'White Diamond' and poorest on 'Pink Lady'.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003208222531
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  • 3
    Electronic Resource
    Electronic Resource
    Water relations of host trees and resistance to the phloem-boring beetle Phoracantha semipunctata F. (Coleoptera: Cerambycidae) (1999)
    Springer
    Oecologia 119 (1999), S. 400-407 
    Details
    ISSN: 1432-1939
    Keywords: Key words Drought stress ; Plant defense ; Eucalyptus ; Phoracantha semipunctata ; Wood-boring insect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Environmental stresses, particularly water deficit, predispose eucalypt trees to attack by the eucalyptus longhorned borer, Phoracantha semipunctata F. (Coleoptera: Cerambycidae). Our experiments with potted eucalypts revealed that reduced tree water potential was associated with lower resistance to colonization by neonate P. semipunctata, but the linear relationship between water potential and colonization success was reversed at higher larval densities. There was no indication that the bark exudate “kino” served to defend trees from borer attack. Larvae were not able to colonize the cambium of eucalypt logs with high bark moisture, and survival was low under high moisture conditions in artificial hosts composed of pure cellulose. In trees and cut logs with moist bark, larvae failed to reach the cambium, feeding instead in poorer-quality tissues just beneath the bark surface. Our findings suggest that variation in resistance of eucalypts to attack by the borer is associated with moisture content of the bark.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050801
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  • 4
    Electronic Resource
    Electronic Resource
    Gibberellic acid causes earlier flowering and synchronizes fruit ripening of coffee (1990)
    Springer
    Plant growth regulation 9 (1990), S. 59-64 
    Details
    ISSN: 1573-5087
    Keywords: Coffea arabica ; synchronization ; fruit set ; bud size ; gibberellin ; flowering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of 100 mgl−1 gibberellic acid (GA3) on flowering and fruit ripening synchrony, fruit set, fruit fresh weight, and vegetative growth were studied for different size classes of coffee (Coffea arabica L. cv. Guatemalan) flower buds. Flower buds that were 〉 4 mm, but not developed to the candle stage at the time of GA3 treatment, reached anthesis 20 days earlier than the controls, and their development was independent of precipitation, unlike the controls. Fruit from buds that were treated with GA3 at the candle stage showed earlier and more synchronous ripening than the control, although no differences in flowering were found during anthesis. Buds that were smaller than 4 mm at the time of treatment did not respond to GA3 applications. Treatment with GA3 did not affect fruit set, fresh weight of fruits, or vegetative shoot growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025279
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  • 5
    Electronic Resource
    Electronic Resource
    Endogenous IAA levels and development of coffee flower buds from dormancy to anthesis (1994)
    Springer
    Plant growth regulation 15 (1994), S. 33-41 
    Details
    ISSN: 1573-5087
    Keywords: Coffea arabica ; flower bud dormancy ; water stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Dormant coffee (Coffea arabica L.) flower buds require water stress to stimulate regrowth. A xylem specific water-soluble dye, azosulfamide, was used to quantify water uptake of buds after their release from dormancy by water stress. In non-stressed flower buds, the rate of water uptake was generally slower and variable compared to stressed flower buds, where the rate of uptake tripled from 1 to 3 days after rewatering and preceded the doubling of fresh and dry weight of buds. Free, ester and amide IAA levels of developing flower buds were measured by gas chromatography-mass spectrometry-selective ion monitoring using an isotope dilution technique with [13C6]IAA as an internal standard. Throughout development, the majority of IAA was present as amide IAA. The proportions of amide and free IAA increased one day after plants were released from water stress, and preceded the doubling of fresh and dry weight. Free and conjugated IAA content per bud remained stable during the period of rapid flower growth until one day before anthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024674
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  • 6
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    Dehardening and budburst of Douglas-fir seedlings raised in three Pacific Northwest nurseries (1989)
    Canadian Science Publishing
    Details
    Publication Date: 1989-02-01
    Description: This study was undertaken to test whether nursery location affected dehardening and budburst of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings from two seed sources. The seedlings, raised at three nurseries in Oregon and Washington, were measured with a whole-plant freezing test in January, February, and March, 1986. In general, seedlings raised at the nursery at highest elevation, and in a few cases, trees from the most northerly nursery, were more frost resistant than trees from a coastal nursery. From January to March, seedlings from the highest (975 m) seed source had less-hardy stem tissue than seedlings from the coastal source (450 m). A growth-chamber experiment confirmed the outdoor dehardening studies. A constant temperature of +5 °C with a 16-h photoperiod maintained cold hardiness, whereas +10 and +15 °C with a 16-h photoperiod promoted rapid dehardening after 20 days. The nursery environment influenced budburst; trees raised in the coastal nursery burst bud significantly earlier than trees from the other two nurseries. Trees of different provenances from the same nursery burst terminal buds only 2 days apart.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 7
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    Frost hardiness as acquired by Douglas-fir seedlings in three Pacific Northwest nurseries (1989)
    Canadian Science Publishing
    Details
    Publication Date: 1989-02-01
    Description: Two-year-old Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings from two seed sources raised in three nurseries in Oregon and Washington were tested for differences in frost hardiness between September 1985 and January 1986. The objective was to determine whether nursery location significantly influenced hardiness. Seedlings were tested by whole-plant freezing to various temperatures, followed by six evaluations of frost hardiness of needle, bud, and stem tissues. Seedlings at the highest nursery had the hardiest needles and those at the coastal nursery the least hardy needles. Bud hardiness, calculated over time, differed between seed sources but not among nurseries. Stem acclimation followed the pattern of needle hardening from November to January. A regression equation calculated to predict frost hardiness from climatic data and elevation of the nurseries showed that elevation, photoperiod, and number of days of frost were the most important independent factors (R2 = 0.29).
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 8
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    Water relations of host trees and resistance to the phloem-boring beetle Phoracantha semipunctata F. (Coleoptera: Cerambycidae) (1999)
    Springer
    Details
    Publication Date: 1999-05-17
    Print ISSN: 0029-8549
    Electronic ISSN: 1432-1939
    Topics: Biology
    Published by Springer
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