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  • Photosynthesis
  • RFLP
  • Zea mays
  • Springer  (12)
  • PANGAEA
  • 1980-1984  (12)
Collection
Keywords
Publisher
  • Springer  (12)
  • PANGAEA
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Salt relations of Dunaliella. Transitional changes in glycerol content and oxygen exchange reactions on water stress (1981)
    Springer
    Archives of microbiology 129 (1981), S. 154-159 
    Details
    ISSN: 1432-072X
    Keywords: Compatible solute ; Dunaliella ; Glycerol ; Osmoregulation ; Osmotic shock ; Photosynthesis ; Respiration ; Salt stress ; Salt tolerance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Changes in glycerol content are reported for Dunaliella tertiolecta over an 8 h period after a salt stress or dilution stress. Under the experimental conditions, the new glycerol level was reached in about 30 min in light or dark but there was evidence of oscillations after that, particularly on dilution stress. Glycerol disappearance on dilution stress is caused predominantly by dissimilation. A salt stress immediately inhibited photosynthetic oxygen evolution and caused net oxygen uptake for a period of about 36 h after the stress. Oxygen evolution was reestablished after that and the process of recovery to the point of resumption of net evolution was not affected by conditions designed to inhibit protein synthesis. Dilution stress of comparable magnitude diminished but did not eliminate photosynthetic oxygen evolution and recovery to a pre-stress level took about 18 h. Effects of HCO 3 - concentration suggested that photorespiration was not the sole determinant of oxygen uptake induced by salt stress but it was not possible to apportion with confidence the contribution of mitochondrial and other types of respiration. There was no evidence that modification by stress of energy-induced proton fluxes across the plasma membrane constituted an osmoregulatory signal in either species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455353
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  • 2
    Electronic Resource
    Electronic Resource
    Chromosomal location of the catalase structural genes in Zea mays using B-A translocations (1980)
    Springer
    Theoretical and applied genetics 58 (1980), S. 211-218 
    Details
    ISSN: 1432-2242
    Keywords: B-A translocations ; Catalase Mapping ; Structural genes ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary B-A translocations have been used to map the catalase genes, Cat1, Cat2, and Cat3 of Zea mays. Cat1 was found to be on the short arm of chromosome 5, 9.1 map units from brittle endosperm (bt 1). Cat2 was located on chromosome 1S, while Cat3 was located on the distal half of chromosome 1L. There was no linkage between Cat2 and Cat3. The significance of mapping the catalase structural genes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00288439
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  • 3
    Electronic Resource
    Electronic Resource
    Aflatoxin contamination caused by natural fungal infection of preharvest corn (1980)
    Springer
    Plant and soil 54 (1980), S. 469-475 
    Details
    ISSN: 1573-5036
    Keywords: Aflatoxin ; Aspergillus flavus ; Corn ; Fungi Maize ; Mycotoxins ; Naturally-occurring toxins ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Aflatoxin contamination of developing corn (Zea mays L.) kernels caused by natural infection byAspergillus flavus Link ex Fries was studied in hybrids developed for the U.S. corn belt and for the southern U.S. and grown at diverse locations in 1977. Planting dates were staggered to examine the effect of crop maturity on infection by the toxin-producing fungus. A broad range of toxin values was observed at harvest; some levels exceeded the highest that had been previously recorded in corn. The highest concentration of aflatoxin B1 detected was 8030 ppb. Levels of toxin differed significantly among planting dates in Florida and Georgia; the second planting date at these locations contained the highest toxin levels. Elevated concentrations of toxin were characteristic of kernel samples from southern locations and southeast Missouri; at these locations samples from hybrids developed for the south had significantly lower levels of toxin than hybrids developed for the corn belt. Ears with heavy insect damage had higher toxin levels than ears with less evidence of insect attack.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181839
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  • 4
    Electronic Resource
    Electronic Resource
    Aflatoxin accumulation in preharvest maize kernels: Interaction of three fungal species, european corn borer and two hybrids (1982)
    Springer
    Plant and soil 65 (1982), S. 95-102 
    Details
    ISSN: 1573-5036
    Keywords: Aflatoxin ; Aspergillus flavus ; Zea mays ; Ostrinia nubilalis ; Mycotoxins ; Naturally-occurring toxins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The interaction was studied among: 1) developing maize kernels (Zea mays L.); 2) European Corn Borer (ECB) (Ostrinia nubilalis Hubner); 3) and three fungal species,Aspergillus flavus Lk. ex Fr.,Penicillium oxalcium Currie and Thom, andFusarium moniliforme Sheld. Two hybrids with varying degrees of resistance to ECB stalk damage were grown in Iowa, Georgia, and Missouri in 1980. One-half of the plots were hand-infested with ECB egg masses. Fungal spores of individual isolates or combinations of the three species were introduced into the silk channels of developing ears in designated plots. ECB larvae were subsequently collected from developing ears. A higher incidence ofA. flavus group isolates was observed in ECB larvae collected from ears that had been inoculated withA. flavus than from insects collected from control ears. Although the resistant hybrid exhibited reduced ECB stalk damage compared with the susceptible variety, no consistent pattern of hybrid effect on the association betweenA. flavus and ECB was observed at all three locations. Differences in aflatoxin B1 levels in mature kernels from the three locations ranged from 8 ppb in Iowa samples to 419 ppb in Missouri kernels. Conditions during crop development at the Missouri location were particularly conducive to elevated presence ofA. flavus propagules in ECB larvae, increased ECB-mediated stalk damage, and greater toxin concentration in mature kernels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02376807
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  • 5
    Electronic Resource
    Electronic Resource
    Regulators of cell division in plant tissues (1980)
    Springer
    Planta 147 (1980), S. 422-434 
    Details
    ISSN: 1432-2048
    Keywords: Cytokinin metabolites ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The cytokinins in certain fractions prepared from extracts of immature sweet-corn (Zea mays L.) kernels using polystyrene ion-exchange resins have been further investigated. Cytokinins active in the radish cotyledon bioassay were purified from these fractions and identified as 9-β-D-glucopyranosylzeatin, 9-β-D-glucopyranosyldihydrozeatin, O-β-D-glucopyranosylzeatin. and O-β-D-glucopyranosyl-9-β-D-ribofuranosylzeatin. In addition, compounds which resemble zeatin and its glycosides in chromatographic behaviour and in ultraviolet absorption characteristics were purified from extracts of the same material by high-performance liquid chromatography. In addition to zeatin and zeatin riboside, the following compounds were identified unambiguously: O-β-D-glucopyranosyl-9-β-D-ribofuranosyldihydrozeatin, O-β-D-glucopyranosyldihydrozeatin, and hihydrozeatin riboside. A further compound was tentatively identified as O-β-D-glucopyranosylzeatin, and at least two unidentified compounds appeared to be new derivatives of zeatin. In identifying the above compounds, chemical-ionization mass spectrometry proved to be an invaluable complementary technique, yielding spectra showing intense protonated-molecular-ion peaks and also prominent structure-related fragmentation that was either not evident or very minor in the electron-impact spectra. An assessment of the relative importance of the various possible mechanisms for cytokinin modification and inactivation in mature sweet-corn kernels was made by supplying [3H]zeatin and [3H]zeatin riboside to such kernels after excision. The principal metabolites of zeatin were adenine nucleotides, adenosine and adenine, while little of the metabolite radioactivity was attributable to known O-glucosides. Adenine nucleotides and adenine were the principal metabolites of zeatin riboside, while lesser metabolites were identified as adenosine, dihydrozeatin, and the O-glucosides of dihydrozeatin and dihydrozeatin riboside. Side-chain cleavage, rather than side-chain modification, appears to be the dominant form of cytokinin metabolism in mature sweet-corn kernels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380183
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  • 6
    Electronic Resource
    Electronic Resource
    Comparative analyses of the effect of triacontanol on photosynthesis, photorespiration and growth of tomato (C3-plant) and maize (C4-plant) (1981)
    Springer
    Planta 152 (1981), S. 44-49 
    Details
    ISSN: 1432-2048
    Keywords: Lycopersicon ; Phetorespiration ; Photosynthesis ; Triacontanol ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Tomato (C3-plants) and maize (C4-plants) were grown in a nutrient solution to which triacontanol was added twice a week. After about 4 weeks the triacontanol treatment caused a significant increase in the dry weight of the tomato plants. Leaf area and dry weight measurements of tomato leaves at different stages of development showed that the largest increase in growth was obtained when triacontanol treatment was initiated before bud formation. In maize, no effect of the triacontanol treatment on dry wieght was observed. Photosynthesis was inhibited by 27% in young leaves from triacontanol-treated tomato plants and 39% in the controls, when the oxygen concentration was raised from 2% to 21%. In maize no change in photosynthesis could be observed, neither after altered oxygen concentration nor after triacontanol treatment. The difference in the response of C3- and C4-plants to triacontanol indicates that it regulates processes related to photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384983
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  • 7
    Electronic Resource
    Electronic Resource
    Contrasting modes of photosynthetic enzyme regulation in oxygenic and anoxygenic prokaryotes (1984)
    Springer
    Archives of microbiology 139 (1984), S. 124-129 
    Details
    ISSN: 1432-072X
    Keywords: Photosynthesis ; Regulation ; Thioredoxin ; Cyanobacterium ; Chromatium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Enzymes that are regulated by the ferredoxin/thioredoxin system in chloroplasts — fructose-1,6-bisphosphatase (FBPase), sedoheptulose-1,7-bisphosphatase purified from two different types of photosynthetic prokaryotes (cyanobacteria, purple sulfur bacteria) and tested for a response to thioredoxins. Each of the enzymes from the cyanobacterium Nostoc muscorum, an oxygenic organism known to contain the ferredoxin/thioredoxin system, was activated by thioredoxins that had been reduced either chemically by dithiothreitol or photochemically by reduced ferredoxin and ferredoxin-thioredoxin reductase. Like their chloroplast counterparts, N. muscorum FBPase and SBPase were activated preferentially by reduced thioredoxin f. SBPase was also partially activated by thioredoxin m. PRK, which was present in two regulatory forms in N. muscorum, was activated similarly by thioredoxins f and m. Despite sharing the capacity for regulation by thioredoxins, the cyanobacterial FBPase and SBPase target enzymes differed antigenically from their chloroplast counterparts. The corresponding enzymes from Chromatium vinosum, an anoxygenic photosynthetic purple bacterium found recently to contain the NADP/thioredoxin sytem, differed from both those of cyanobacteria and chloroplasts in showing no response to reduced thioredoxin. Instead, C. vinosum FBPase, SBPase, and PRK activities were regulated by a metabolite effector, 5′-AMP. The evidence is in accord with the conclusion that thioredoxins function in regulating the reductive pentose phosphate cycle in oxygenic prokaryotes (cyanobacteria) that contain the ferredoxin/thioredoxin system, but not in anoxygenic prokaryotes (photosynthetic purple bacteria) that contain the NADP/thioredoxin system. In organisms of the latter type, enzyme effectors seem to play a dominant role in regulating photosynthetic carbon dioxide assimilation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401986
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  • 8
    Electronic Resource
    Electronic Resource
    The ribosomal RNA genes from chloroplasts of mustard (Sinapis alba L.): mapping and sequencing of the leader region (1984)
    Springer
    Plant molecular biology 3 (1984), S. 147-158 
    Details
    ISSN: 1573-5028
    Keywords: chloroplast genome ; leader region ; rDNA ; Sinapis alba ; Zea mays ; tRNAVal gene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The genes coding for rRNAs from mustard chloroplasts were mapped within the inverted repeat regions of intact ctDNA and on ctDNA fragments cloned in pBR322. R-loop analysis and restriction endonuclease mapping show that the genes for 16S rRNA map at distances of 17 kb from the junctions of the repeat regions with the large unique region. The genes for 23S rRNA are located at distances of 2.8 kb from the junctions with the small unique region. Genes for 4.5S and 5S rRNA are located in close proximity to the 23S rRNA genes towards the small unique region. DNA sequencing of portions of the 5′ terminal third from the mustard 16S rRNA gene shows 96–99% homology with the corresponding regions of the maize, tobacco and spinach chloroplast genes. Sequencing of the region proximal to the 16S rRNA gene reveals the presence of a tRNAVal gene in nearly the same position and with identical sequence as in maize, tobacco and spinach. Somewhat less but still strong homology is also observed for the tDNA Val/16S rDNA intercistronic regions and for the regions upstream of the tRNAVal gene. However, due to many small and also a few larger deletions and insertions in the leader region, common reading frames coding for homologous peptides larger than 44 amino acids can not be detected; it is therefore unlikely that this region contains a protein coding gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016062
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  • 9
    Electronic Resource
    Electronic Resource
    An evaluation of mitochondrial heterosis and in vitro mitochondrial complementation in wheat, barley and maize (1981)
    Springer
    Theoretical and applied genetics 59 (1981), S. 153-160 
    Details
    ISSN: 1432-2242
    Keywords: Mitochondrial heterosis ; Mitochondrial complementation ; Triticum aestivum ; Hordeum vulgare ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two families each of wheat (Triticum aestivum L.), barley (Hordeum vulgare L.) and maize (Zea mays L.) were studied for mitochondrial heterosis and in vitro mitochondrial complementation. Inbred parents and their hybrids were compared for seedling heights and rate of oxygen uptake by the whole tissue to find out if the hybrids showed greater growth and respiratory activity at the seedling stage. Further comparisons were made by isolating mitochondria from the seedling tissues and measuring their ADP∶0 ratio, respiratory control ratio and cytochrome c oxidase activity for mitochondrial heterosis. Mixtures of parental mitochondria were similarly compared with parental and hybrid mitochondria for in vitro mitochondrial complementation. No evidence for mitochondrial heterosis or in vitro mitochondrial complementation was found, nor any correlation between the different mitochondrial parameters, seedling heights or rates of oxygen uptake by seedling tissue. The suggested use of mitochondrial heterosis and in vitro mitochondrial complementation for plant breeding is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264969
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of sediment moisture on carbon dioxide exchange inSpartina alterniflora (1984)
    Springer
    Plant and soil 79 (1984), S. 291-293 
    Details
    ISSN: 1573-5036
    Keywords: Photosynthesis ; Salt marsh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Effect of moisture stress on photosynthesis activity ofSpartina alterniflora was studied using sediment cores taken from a Louisiana Gulf Coast salt marsh. Moisture stress was induced by evapotranspiration losses which simulate conditions that can occur when a salt marsh is not inundated by tidal cycles for extended periods. Changes in the sediment moisture from 70% to 28% when expressed as a percentage of the wet weight resulted in a rapid decrease in net CO2 fixation. The moisture content of this sediment remained above saturation throughout the experiment although the solute or osmotic potential was equivalent to being in the range between field capacity and permanent willing. Net fixation was correlated with the moisture content (r=0.92**). Plant photosynthetic activity decreased at sediment moisture levels below 70%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182352
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