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  • 1
    Electronic Resource
    Electronic Resource
    Growth Regulators and the Phytochrome-Mediated Dormancy of Celery Seeds (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 35 (1975), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Seeds of five celery (Apium graveolens L.) cultivars germinated at 15°C in the light or dark but at 22°C only in the light. This light requirement was overcome by treatment with a mixture of the gibberellins GA4 and GA7 (GA4/7) but interactions of cytokinins, daminozide, ethephon, EDTA and N-phenyl-N′-4-pyridylurea (NC5392) with GA4/7 were observed. Varietal differences in response to GA4/7 concentration and the requirement for cytokinins were related to the upper temperature limits for germination of the different cultivars. Seeds of cultivars responding to low concentrations of GA4/7 appeared to contain less natural inhibitor than those requiring either high concentrations of GA4/7 or cytokinin in addition to low GA4/7. The cytokinin requirement for germination was partially removed by leaching the seeds with water. Interaction studies with applied hormones indicated that in seeds incubated in the light inhibition by abscisic acid was partially alleviated by N6-benzyladenine but not by GA4/7 application. The implications of these results are discussed in relation to the involvement of natural plant hormones in the dormancy mechanism of celery seeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1975.tb03876.x
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  • 2
    Electronic Resource
    Electronic Resource
    THE YIELD AND QUAEITY OF RED BEET SEED AS AFFECTED BY DESICCANT SPRAYS AND HARVEST DATE (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 8 (1968), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary. Diquat and sodium monochloroacetate (SMA) were used to desiccate seed crops of red beet in experiments from 1963 to 1965. The seed plants became brown and dry about 7 days after spraying and were then judged suitable for combine harvesting, although this was not done in these experiments. Yields of seed 7 days after spraying were as good as those from the control plants, but were lower than the control yields when harvested 14 days after spraying. In laboratory tests in moist sand at 20° C the percentage of the embryos which germinated was not markedly affected by diquat or SMA treatment. The emergence of seedlings in the field, however, was affected adversely by treatment of the seed crop with 11 and 22 oz/ac of diquat ion in 1963 and by SMA at 20 lb/ac in 1964 and 1965. Diquat at 6·6 oz/ac in 120 gal/ac water in 1964 and 1965 had no serious adverse effects on embryo emergence. Residues of diquat ion in seed varied from 2 to 4 ppm, but the impairment of embryo emergence by diquat was believed to be due to the premature arrest of growth of the seed on the desiccated plants.It is concluded that when harvesting conditions are poor, desiccants could be valuable.Influence des traitements dessicants et de la date de récolte sur le rendement et la qualité de la sentence de betterave rouge
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1968.tb01438.x
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  • 3
    Electronic Resource
    Electronic Resource
    Book reviews (1989)
    Springer
    Irrigation science 10 (1989), S. 165-168 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265692
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of Nutritional Treatments of Seed-bearing Plants on the Performance of their Progeny (1965)
    [s.l.] : Nature Publishing Group
    Nature 205 (1965), S. 819-820 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In experiments with watercress (Rorippa nasturtium aquaticum L., Hayek) seed was harvested from plants grown in sand cultures supplied with Hewitt's4 nutrient solution modified to contain either 0.2, 1.0 or 4.0 m.equiv./ 1. phosphorus (as ortho-phosphate). Iron was supplied chelated with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/205819b0
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  • 5
    Electronic Resource
    Electronic Resource
    Dormancy-release of celery seed by a growth retardant, N-dimethylaminosuccinamic acid (alar) (1971)
    Springer
    Planta 100 (1971), S. 370-372 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Alar (N-dimethylaminosuccinamic acid) was more effective than the cytokinin benzyladenine (BA) in breaking dormancy of light-sensitive celery seed treated with a mixture of gibberellins A4 and A7 (GA4/7).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385203
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  • 6
    Electronic Resource
    Electronic Resource
    The specific activity of ribulose-1,5-bisphosphate carboxylase in relation to genotype in wheat (1986)
    Springer
    Planta 167 (1986), S. 344-350 
    Details
    ISSN: 1432-2048
    Keywords: Aegilops ; Genotype ; Ribulose-1,5-bisphosphate carboxylase ; Triticum (RuBPCase)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The specific activity of ribulose-1,5-bisphosphate carboxylase (RuBPCase; EC 4.1.1.39) in crude extracts of leaves from euploid, amphiploid and alloplasmic lines of wheat fell into high or low categories (3.75 or 2.70 μmol·mg−1·min−1, 30°C). For the alloplasmic lines, where the same hexaploid nuclear genome was substituted into different cytoplasms, the specific activity of RuBPCase was consistent with the type of cytoplasm (high for the B and S cytoplasms and low for the A and D cytoplasms). There was no evidence from the euploid and amphiploid lines that small subunits encoded in different nuclear genomes influenced the specific activity. High specific activity was conferred by possession of the chloroplast genome of the B-type cytoplasm which encodes the large subunit of RuBPCase. All lines with a cytoplasm derived from the Sitopsis section of wheat, with the exception of Aegilops longissima and A. speltoides 18940, had RuBPCase with high specific activity. In contrast with the euploid lines of A. longissima, the alloplasmic line containing A. longissima cytoplasm from a different source had RuBPCase with high specific activity. The difference in specific activity found here in-vitro was not apparent in-vivo when leaf gas exchange was measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391337
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  • 7
    Electronic Resource
    Electronic Resource
    Genotype × environment interaction in carbon isotope discrimination and seed yield in cowpea (Vigna unguiculata L. Walp.) (1993)
    Springer
    Euphytica 73 (1993), S. 213-224 
    Details
    ISSN: 1573-5060
    Keywords: carbon isotope discrimination ; drought tolerance ; genotype × environment interaction ; cowpea ; Vigna unguiculata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Twenty locally-adapted but genetically diverse cowpea genotypes were grown in 17 replicated trials in a range of sites and seasons in the drylands of eastern Kenya, and the discrimination against the heavy isotope of carbon (with a mass of 13) (Δ) was determined in grain and straw samples. Most genotypes gave similar, low grain yields in the environments which subjected the plants to drought stress, but high yielding and low yielding genotypes were clearly distinct in the less stressful environments. The converse pattern was found for Δ: the genotypes were all very similar in the non-stressful (high-Δ) environments, but in the stressful environments, low-Δ (drought susceptible) and high-Δ (drought avoiding) genotypes were clearly distinct. This pattern was clearest for straw Δ, but was also apparent for grain Δ. The early-maturing genotypes, which escaped terminal drought, were generally those with the most stable and highest Δ, but in the case of straw Δ there were statistically significant deviations from this relationship. It is concluded that Δ provides a reliable measure of the specific response of cowpea genotypes to drought, which may be of value in breeding programs provided that carbon isotope discrimination can be measured reasonably economically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00036701
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  • 8
    Electronic Resource
    Electronic Resource
    A new infra-red gas analyser and portable photosynthesis meter (1982)
    Springer
    Photosynthesis research 3 (1982), S. 141-151 
    Details
    ISSN: 1573-5079
    Keywords: infra-red gas analysis ; photosynthesis ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The new infra-red gas analyser for measurement of CO2 concentration described uses a focussed, dual optical path. The 2W radiation source is a heated alumina bead and a cooled lead selenide photoconductive detector measures the difference in radiation absorption at 4.26 μm by the gas in sample and reference tubes. Radiation is chopped alternately between these tubes at 120 Hz. The signal from the detector is processed through an a.c. coupled amplifier, phase sensitive detector and low pass filter. Incorporated into the photosynthesis meter, the sample tube of the analyser is connected to a leaf chamber and circulating pump forming a closed gas circuit. As a leaf in the chamber removes carbon dioxide from the air in the closed circuit, the decrease in its concentration is sensed by the analyser. The time taken for the concentration to decrease by a predetermined amount (typically 30 ppm) is displayed and rate of net photosynthesis can be calculated from this and the volume of the closed circuit. A measurement of the light-saturated rate of net photosynthesis of a healthy flag leaf of wheat can be made in 10–15 seconds. The system is fully portable and has been used intensively in the field for two summers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040712
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of fluorescence transients of DCMU-treated leaves of Triticum species to provide estimates of the densities of photosystem II reaction centres (1986)
    Springer
    Photosynthesis research 7 (1986), S. 203-219 
    Details
    ISSN: 1573-5079
    Keywords: fluorescence induction ; photosynthesis ; photosystem II ; Triticum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The fluorescence of the chlorophyll associated with photosystem II was studied in seedling and flag leaves of Triticum species. Seedling leaves of the diploid species T. urartu had higher values of t (the normalised area over the fluorescence induction curve of DCMU treated leaves) than those of the other species studied which included hexaploid T. aestivum. However this difference was not evident when leaves were grown in a low light intensity (40 µmol quanta of photosynthetically active radiation m−2 s−1). The smaller total number of chlorophyll molecules per photosystem II reaction centre (chl/RCII) in T. urartu (177) as compared with the other species (mean 234) was deduced from the observed differences in t. As a consequence of its lower chl/RCII, despite slightly lower chlorophyll content (mg m−2), T. urartu had a greater density of reaction centres than the other species (2880 cf 2230 nmol m−2 of leaf). Consistent with the lower chl/RCII of T. urartu, it had a higher chlorophyll a/b ratio than the other genotypes. Seedling leaves of T. urartu had higher light saturated rates of photosynthesis than those of the other species, when grown at high light, a difference associated with reaction centre density. In flag leaves, when the complications due to variable development and senescence patterns were eliminated, t of the diploid species including T. urartu was lower than that of T. aestivum. The lower apparent chl/RCII of T. urartu arose partly because the molar extinction coefficient of the chlorophyll in the leaves of T. urartu was greater than in T. aestivum. However, the density of PS II reaction centres was slightly lower for the diploid species studied because their chlorophyll contents were lower than the hexaploids. The validity of the method for estimating chl/RCII from fluorescence transients is discussed. The possibility is considered that the difference in apparent chl/RCII of flag and seedling leaves of R. urartu as compared to the other five genotypes is a consequence of its different adaptive response to the spectral quality of the light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014675
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  • 10
    Electronic Resource
    Electronic Resource
    Estimation of the light distribution between photosystems I and II in intact wheat leaves by fluorescence and photoacoustic measurements (1986)
    Springer
    Photosynthesis research 7 (1986), S. 257-267 
    Details
    ISSN: 1573-5079
    Keywords: Chlorophyll a fluorescence ; photoacoustic spectroscopy ; photosystem I ; photosystem II ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Usisng intact leaves, the extent of the decrease in chlorophyll a fluorescenece caused by the addition of continuous 710 nm light superimposed on modulated (20 Hz) 550 nm light was used to determine the distribution of this absorbed light between photosystems I (α) and II (β). The Fo and Fm levels, which defined the total variable fluorescenece, were taken as equal to those obtained with excess 710 nm light and with saturating blue-green light, respectively. An analogous procedure was used with a photoacoustic detector, saturating white light defining a base line for oxygen yield, the levels with an without 710 nm light being used to define β and α respectively. The two methods gave similar values for the distribution of light between the two photosystems for the experimental conditions used, β averaging 0.55 for a range of Triticum genotypes and Brachypodium sylvaticum grown in high or low light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014679
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