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  • 1
    Electronic Resource
    Electronic Resource
    Root zone temperature sensitivity of nitrogen fixing and nitrate-supplied soybean [Glycine max (L.) Merr. cv maple arrow] and lupin (Lupinus albus L. cv ultra) plants
    Amsterdam : Elsevier
    Environmental and Experimental Botany 34 (1994), S. 117-127 
    Details
    ISSN: 0098-8472
    Keywords: Glycine max (L.) Merr. ; Lupinus albus L. ; N"2 fixation ; [abr] DAP = days after planting ; [abr] LSD = least significant difference ; [abr] NPR = nodule to plant ratio ; [abr] RGR = relative growth rate ; [abr] RSNR = root to shoot N ratio ; [abr] RSR = root to shoot ratio ; [abr] RZT = root zone temperature ; [abr] SLW = specific leaf weight ; low root zone temperature ; lupin ; nitrate uptake ; soybean
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0098-8472(94)90031-0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Genistein preincubation of Bradyrhizobium japonicum cells improves strain competitiveness under greenhouse, but not field conditions (2000)
    Springer
    Plant and soil 223 (2000), S. 231-236 
    Details
    ISSN: 1573-5036
    Keywords: Bradyrhizobium japonicum ; genistein ; soybean ; strain competitiveness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In the soybean-B. japonicum symbiosis, genistein has been identified as one of the major compounds in soybean seed and root exudates responsible for inducing expression of the B. japonicum nodYABC operon. In this study, we have tested the possibility that genistein treatment prior to inoculation can increase the competitiveness of the treated B. japonicum strain under both greenhouse and field conditions. Two mutants of the two B. japonicum strains each with a different antibiotic resistant marker were selected. They were tested with one or the other treated with genistein. The results showed genistein treated mutants had higher levels of nodule occupancy than the untreated mutant or parent strain under greenhouse conditions. Mutants from 532C had higher nodule occupancies than mutants from USDA110, especially at 15 °C. In the more complex field environment, genistein treated mutants formed fewer nodules than the untreated mutants. The contradictory results of strain competitiveness for greenhouse and field experiments are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004880305826
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Leafy reduced-stature maize for short-season environments: morphological aspects of inbred lines (1997)
    Springer
    Euphytica 96 (1997), S. 301-309 
    Details
    ISSN: 1573-5060
    Keywords: leafy normal-stature ; leafy reduced-stature ; non-leafy normal-stature ; non-leafy reduced-stature ; maize ; short season environments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Development of maize (Zea mays L.) types that produce leaf area rapidly and finish vegetative development quickly would increase production of maize in mid- to short-season areas. The Leafy (Lfy1) and reduced-stature (rd1) traits each make contributions to this end. However, these two traits have not previously been combined. Our objective was to evaluate the morphological aspects of non-leafy normal-stature (NLNS), leafy reduced-stature (LRS), non-leafy reduced-stature (NLRS), and leafy normal-stature (LNS) maize inbreds. Two traits, Lfy1 and rd1, were incorporated into a series of inbreds, resulting in a range of canopy architectures. Twelve variables were recorded for each of 30 inbreds over three years. The 12 variables were: seed emergence, above-ear leaf number, below-ear leaf number, dead leaf number at tasselling, live leaf number at tasselling, total leaf number, above-ear leaf area, ear leaf length, ear leaf width, ear height, internode length, and plant height. Inbreds containing the Lfy1 trait had more above-ear leaf area, above-ear leaf number, dead leaf number at tasselling, total leaf number and number of live leaves at tasselling than non-leafy inbred lines. Below-ear leaf number was not different among LRS, LNS, and NLNS inbred lines. LRS and NLRS inbred lines were also not different for below-ear leaf number. Plant height, ear height, and ear leaf length and width were higher in normal-stature than reduced-stature plants. The proportion of the seeds which emerged was higher for LRS inbreds than the other trait groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003006922761
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Leafy reduced-stature maize for short-season environments: Yield and yield components of inbred lines (1997)
    Springer
    Euphytica 97 (1997), S. 129-138 
    Details
    ISSN: 1573-5060
    Keywords: leafy normal-stature ; leafy reduced-stature ; non-leafy normal-stature ; non-leafy reduced-stature ; maize ; short season environments ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Development of maize (Zea mays L.) types that produce leaf area and mature quickly would increase production of maize in mid- to short-season areas. The leafy (Lfy1) and reduced-stature (rd1) traits both make contributions to this end. However, these two traits have not previously been combined. Our objective was to evaluate the yield and yield components of non-leafy normal-stature (NLNS), leafy reduced-stature (LRS), non-leafy reduced-stature (NLRS), and leafy normal-stature (LNS) maize inbred lines. The two genes, ‘Lfy1’ and ‘rd1’, were incorporated into a series of inbred lines resulting in a range of canopy architectures. Ten variables were recorded for each of 30 inbred lines over three years. The 10 variables were: corn heat unit requirement from planting to tasselling, corn heat unit requirement from planting to silking, days between tasselling and silking, grain moisture content, husk dry weight, cob dry weight, ear length, maximum ear circumference, grain yield and ratio of grain yield to moisture content. Reduced-stature inbred lines reached anthesis more quickly than normal-stature inbred lines. Grain moisture content was less in reduced-stature inbred lines than normal stature trait groups. Leafy-reduced stature plants had the highest ratio of grain to moisture content and the lowest grain moisture content at harvest. Inbred lines containing the rd1 trait matured more rapidly than other trait groups. The LRS trait group yielded more than the other groups, and showed great potential for use in mid- to short-season environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002953906498
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Preincubation of B. japonicum cells with genistein reduces the inhibitory effects of mineral nitrogen on soybean nodulation and nitrogen fixation under field conditions (2000)
    Springer
    Plant and soil 223 (2000), S. 237-244 
    Details
    ISSN: 1573-5036
    Keywords: Bradyrhizobium japonicum ; genistein ; mineral nitrogen ; nodulation ; soybean
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Genistein is the major root produced isoflavonoid inducer of nod genes in the symbiosis between B. japonicum and soybean plants. Reduction in the isoflavonoid content of the host plants has recently been suggested as a possible explanation for the inhibition of mineral nitrogen (N) on the establishment of the symbiosis. In order to determine whether genistein addition could overcome this inhibition, we incubated B. japonicum cells (strain 532C) with genistein. Mineral N (in the form of NH4NO3) was applied at 0, 20 and 100 kg ha-1. The experiments were conducted on both a sandy-loam soil and a clay-loam soil. Preincubation of B. japonicum cells with genistein increased soybean nodule number and nodule weight, especially in the low-N-containing sandy-loam soil and the low N fertilizer treatment. Plant growth and yield were less affected by genistein preincubation treatments than nitrogen assimilation. Total plant nitrogen content was increased by the two genistein preincubation treatments at the early flowering stage. At maturity, shoot and total plant nitrogen contents were increased by the 40 μM genistein preincubation treatment at the sandy-loam soil site. Total nitrogen contents were increased by the 20 μM genistein preincubation treatment only at the 0 and 20 kg ha-1 nitrate levels in clay-loam soil. Forty μM genistein preincubation treatment increased soybean yield on the sandy-loam soil. There was no difference among treatments for 100-seed weight. The results suggest that preincubation of B. japonicum cells with genistein could improve soybean nodulation and nitrogen fixation, and at least partially overcome the inhibition of mineral nitrogen on soybean nodulation and nitrogen fixation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004832422665
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    Paper (German National Licenses)
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