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  • 1985-1989  (2)
  • 1985  (2)
  • Calcareous soil  (1)
  • Inversion karyotypes  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Heterosis without selectional coadaptation inDrosophila ananassae (1985)
    Springer
    Theoretical and applied genetics 69 (1985), S. 437-441 
    Details
    ISSN: 1432-2242
    Keywords: Inversion karyotypes ; Relative fitness ; Heterosis in interpopulation crosses ; Coadaptation ; Drosophila ananassae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The relative viabilities of homozygous and heterozygous karyotypes were measured by making crosses between strains ofD. ananassae homozygous for ST or inverted gene orders in the second and third chromosomes. The strains utilized during the present study originated from widely separated localities in India, Kuala Lumpur and Kota Kinabaru, Malaysia and Chian Mai, Thailand. The presence of heterosis in many interpopulation crosses is evident from the results which show that the inversion heterozygotes formed by chromosomes coming from distant populations exhibit heterosis. On the other hand, heterosis is absent in two intrapopulation crosses. Thus the present results provide evidence that heterozygosis for many genes and gene complexes does produce high fitness without previous selectional coadaptation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570914
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  • 2
    Electronic Resource
    Electronic Resource
    Zinc-deficiency symptoms in lowland rice as induced by modified-urea materials applied at different rates of nitrogen in calcareous soil (1985)
    Springer
    Plant and soil 87 (1985), S. 439-440 
    Details
    ISSN: 1573-5036
    Keywords: Calcareous soil ; Modified-urea materials ; Oryza sativa L. ; Rainfed lowland ; Zinc deficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Studies revealed that Zn-deficiency symptoms were induced markedly by the levels of nitrogen and its source in rainfed lowland rice grown on calcareous soil. Visual Zn-deficiency symptoms recorded 3 weeks after transplanting showed that increased supply of nitrogen at puddling resulted in significant increase in the extent of deficiency symptoms of this nutrient element. Zn-deficiency symptoms got aggravated with Mussorrie Rock Phos-coated urea (MRPCU) followed by sulphur-coated urea (SCU). Zn-deficiency symptoms induced by urea supergranules (USG) and prilled urea (PU) supplying two-thirds of nitrogen as basal were found to be of moderate level. No symptoms of Zn-deficiency were noted with no-nitrogen control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181911
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    Paper (German National Licenses)
    Fulltext
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