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  • 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
    Assessment of some extractants for available zinc in relation to response of rice to applied zinc in Sub-Himalayan hill and forest soils (1984)
    Springer
    Plant and soil 79 (1984), S. 417-428 
    Details
    ISSN: 1573-5036
    Keywords: Extractants for available Zn ; Hill and forest soils ; Rice ; Threshold value ; Zinc response
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The available Zn in 25 soils of Sub-Himalayan hill and forest region was determined by using some chemical extractants to evaluate its critical limit in soils and rice plant. The critical limit of soil available Zn using DTPA-CaCl2, DTPA-NH4HCO3, EDTA-NH4OAc and EDTA-(NH4)2CO3 was 0.76, 0.86, 0.85 and 1.18 ppm, respectively. The amount of Zn extracted by these extractants was positively and significantly correlated with per cent dry matter yield. In addition to per cent dry matter yield, the Zn extracted by DTPA-CaCl2, DTPA-NH4 HCO3 and EDTA-(NH4)2CO3 was also positively correlated with Zn concentration in 3rd leaf of rice, Zn concentration in rice shoots, Zn uptake by rice shoots and organic carbon content of the soil, and negatively correlated with soil pH.The 2N MgCl2 and 0.1N HCl extractants were found to be not suitable for these soils. Among the four promising extractants, EDTA-(NH4)2CO3 was most efficient as the value of critical limit determined by it expressed 82.4% predictability in the degree of accuracy against 36.8% with EDTA-NH4OAc. Hence EDTA-NH4OAc is the least efficient extractant for estimation of available Zn in such soils. The critical Zn concentration in 3rd leaf of rice was worked out to be 21.5 ppm below which economic responses to Zn application can be expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184332
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Relative effectiveness of various types and methods of zinc application on rice and maize crops grown in calcareous soil (1983)
    Springer
    Plant and soil 73 (1983), S. 315-322 
    Details
    ISSN: 1573-5036
    Keywords: Organic manures ; Residual effects ; Rice ; Yield ; Zinc application ; ZnO suspension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Application of zinc sulphate mixed with compost/poultry manure proved to be equivalent to the effect of dipping the seedling roots in 4% ZnO suspension with respect to rice yields but Zn-amended organic manures were superior to other treatments with regards to total Zn uptake. A marked residual effect of soil applied treatments was recorded on the succeeding maize crop. Application of poultry manure alone was about one and a half times more effective than compost alone in increasing the rice and maize grain yields. Poultry manure surpassed compost in increasing zinc uptake by the crops and at the same time it built up more available Zn in soil than compost for the following crop. The magnitude of yields and Zn uptake response were magnified when zinc sulphate was applied along with organic manures. Application of 25 kg zinc sulphate/ha alone had the same effect as 50 quintals poultry manure alone or 12.5 kg zinc sulphate applied with 50 quintals compost/ha with respect to crop yields. A significant positive correlation was, recorded in both the crops between Zn concentration in grain or straw and their respective yields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184307
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of threshold value of iron in soils and plants for the response of rice and lentil to iron application in calcareous soil (1984)
    Springer
    Plant and soil 82 (1984), S. 141-148 
    Details
    ISSN: 1573-5036
    Keywords: Calcareous soil ; DTPA-extractable iron ; Iron ; Lentil ; Rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In a pot experiment with 26 calcareous soils, the critical limit of Fe in soils and plants was evaluated. DTPA-extractable Fe was found significanty correlated with Bray's per cent yield in rice. The Fe2+ (iron) in rice and lentil was also found significantly correlated with DTPA-extractable Fe as well as Bray's per cent yield showing thereby the superiority of Fe2+ (iron) in leaves over DTPA-extractable soil Fe to differentiate Fe responsive soils from non-responsive ones. The total Fe content in plant tissues does not seem correlated with the occurrence of Fe deficiency. The threshold values of DTPA-extractable soil Fe and Fe2+ (iron) in rice and lentil leaves were 6.95, 44 and 74.5 ppm, respectively below which appreciable responses to Fe application were observed. The optimum Fe level for these soils was found to be 10 ppm in which the dry matter yield response in all the 19 rice soils and 16 lentil soils ranged from 14.28 to 56.16 (Av. 25.75%) and 13.31 to 53.97 (Av. 22.47%), respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220778
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  • 5
    Electronic Resource
    Electronic Resource
    Selection for high and low mating propensity inDrosophila ananassae (1988)
    Springer
    Behavior genetics 18 (1988), S. 357-369 
    Details
    ISSN: 1573-3297
    Keywords: Drosophila ananassae ; selection ; high and low mating propensity ; polygenes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract InDrosophila ananassae, artificial selection was carried out for high and low mating propensity for 15 generations. Response to selection was from about F5, with rapid divergence in mating frequencies in replicates of both fast and slow lines. To assess the effect of selection on the two sexes, females and males of the selected lines were tested against their respective counterparts of the control line after 15 generations. Significant differences in mating propensity were observed when selected males were tested against the control females, which suggests that males were much more affected by selection than females. After 15 generations the fast and slow lines (both replicates) were crossedinter se and mating frequencies of F1 hybrids were studied in the same way as during the selection experiment. F1 flies had a higher mating activity compared to their parental lines when males were derived from fast lines to produce hybrids. On the other hand, F1 hybrids produced by crossing slow-line males with fast-line females showed mating frequencies similar to those of the slow parental lines. These findings suggest that mating propensity inD. ananassae is under the control of polygenes. Furthermore, the significant differences in mating propensity of hybrids produced by the fast and slow males indicate the possibility of a Y-linked influence on mating propensity inD. ananassae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01260936
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  • 6
    Electronic Resource
    Electronic Resource
    Selection for high and low pupation height inDrosophila ananassae (1993)
    Springer
    Behavior genetics 23 (1993), S. 239-243 
    Details
    ISSN: 1573-3297
    Keywords: Drosophila ananassae ; selection ; high and low pupation height ; polygenes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Selection for high and low pupation height inDrosophila ananassae was carried out for 10 generations. Response to selection resulted in rapid divergence in pupation height in replicates of both high and low lines. There was a significant difference in mean pupation height among high, low, and control lines. Regression coefficients for both high and low lines were significantly different from zero. The realized heritability over 10 generations was 45–49 for the high lines and 26–29 for the low lines. The F1 hybrids produced by making reciprocal crosses between high and low lines showed intermediate pupation height. These findings suggest that pupation height inD. ananassae is under polygenic control, with a substantial amount of additive genetic variation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082461
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  • 7
    Electronic Resource
    Electronic Resource
    Population and behaviour genetics of Drosophila ananassae (1996)
    Springer
    Genetica 97 (1996), S. 321-329 
    Details
    ISSN: 1573-6857
    Keywords: Drosophila ananassae ; population and behaviour genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Drosophila ananassae is a cosmopolitan and domestic species. It occupies a nuique status among the Drosophila species due to certain peculiarities in its genetic behaviour. The most unusual feature of this species is spontaneous male recombination in appreciable frequency. The present review summarises the work done on population and behaviour genetics of D. ananassae from India. Population dynamics of three cosmopolitan inversions has been studied in Indian population of D. ananassae and it is evident from the results that there is a considerable degree of genetic divergence at the level of inversion polymorphism. In general, the populations from south India show more differentiation than those from the north. These three cosmopolitan inversions, which are coextensive with the species, exhibit heterosis. Interracial hybridization does not lead to beaakdown of heterosis, which suggests that evidence for coadaptation is lacking in geographic populations of D. ananassae. Heterosis appears to be simple luxuriance rather than populational heterosis (coadaptation). Unlinked inversions occur in random associations, indicating no interchromosomal interactions. However, two inversions of the third chromosome often show strong linkage disequilibrium in laboratory populations, which is due to epistatic gene interaction and suppression of crossing-over. Genetic variations for certain allozyme polymorphism and sternoleural bristle phenotypes in Indian populations of D. ananassae have also been observed. A number of investigations have also been carried out on certain aspects of behaviour genetics of Indian D. ananassae. There is evidence for sexual isolation within D. ananassae. Significant variations in mating propensity of several isofemale strains, inversion karyotypes, the diminishing effects of certain mutations on sexual activity of males and positive response to selection for high and low mating propensity provide evidence for genetic control of sexual behaviour in D. ananassae. Males contribute more to variation and thus are more subject to intra-sexual selection than females. Evidence for rare male mating advantage has also been presented. Geographic strains of D. ananassae show variation with respect to oviposition site preference. The results of studies on pupation site preference, which is an important component of larval behaviour, suggest that larval pupation behaviour in D. ananassae is under polygenic control with a substantial amount of additive genetic variation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00055318
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    Paper (German National Licenses)
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