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M. Parrent - One of the best experts on this subject based on the ideXlab platform.
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A karyological analysis of the Artificial Hybridization between Clarias gariepinus (Burchell, 1822) and Heterobranchus longifilis Valenciennes, 1840 (Pisces; Clariidae)
Journal of Fish Biology, 1992Co-Authors: Guy G. Teugels, C. Ozouf-costz, Marc Legendre, M. ParrentAbstract:A karyological analysis of an Artificial Hybridization (reciprocal crosses) between two African clariid catfish, Clarias gariepinus (Burchell, 1822) and Heterobranchus longifilis Valenciennes, 1840, was performed. C. gariepinus has a standard karyotype of 2n= 56, while H. longifilis has 2n= 52. The hybrids revealed an intermediate karyotype (2n= 54), and it appears as if they have totalized the haploid chromosome number of both parental species, excluding gynogenesis or androgenesis. The hybrid karyotype is considered as aneuploid, although the hybrids proved to be fertile. No variation was found in the hybrids karyotypes.
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A karyological analysis of the artifi Clarias gaviepinus (Burchell, 1822) and Heterobranchus IongzjEs Valenciennes, 1840 (Pisces; Clariidae)
1992Co-Authors: Guy G. Teugels, Marc Legendre, C. Ozouf-costaz, M. ParrentAbstract:A karyological analysis of an Artificial Hybridization (reciprocal crosses) between two African clariid catfish, Clarias gariepinus (Burchell, 1822) and Heterobranchus longifilis Valenciennes, 1840, was performed. C. gariepinus has a standard karyotype of h=56, while H. longifiris has 2n = 52. The hybrids revealed an intermediate karyotype (2n = 54), and it appears as if they have totalized the haploid chromosome number of both parental species, excluding gynogenes.is or androgenesis. The hybrid karyotype is considered as aneuploid, although the hybrids proved to be fertile. No variation was found in the hybrids karyotypes.
William S. Davidson - One of the best experts on this subject based on the ideXlab platform.
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Artificial Hybridization of Newfoundland brown trout and Atlantic salmon: hatchability, survival and growth to first feeding
Aquaculture, 1992Co-Authors: Colin Mcgowan, William S. DavidsonAbstract:Abstract The relative viability of hybrids produced using anadromous brown trout, Atlantic salmon grilse and sexually mature Atlantic salmon parr from a Newfoundland river was investigated. The sperm of sexually mature salmon performed equally well compared to anadromous salmon sperm when fertilizing both salmon and trout eggs. Hatching success was high in all crosses and controls. By first feeding, hybrids produced using brown trout eggs had suffered higher mortality and were smaller in size than the reciprocal hybrid and both parental controls. Hybrids produced using salmon eggs exhibited high viability and by first feeding were greater in size than both parental controls. A comparison of hatching time and length of hatching period suggests a paternal influence in embryo development. Possible reasons for the differences between reciprocal hybrids and the significance of results with respect to aquaculture are discussed.
Gustavo Sessa Fialho - One of the best experts on this subject based on the ideXlab platform.
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efficiency of Artificial Hybridization in soybean during the summer depending on temperature and relative humidity eficiencia da hibridacao Artificial em soja durante o verao depende da temperatura e umidade relativa
Bioscience Journal, 2015Co-Authors: Éder Matsuo, Tuneo Sediyama, Cosme Damião Cruz, Sérgio Hermínio Brommonschenkel, Silvana Da Costa Ferreira, Gustavo Sessa FialhoAbstract:Hybridization is an important improvement method used in the soybean culture. However, there is little information on the recommended relative moisture and air temperature degree for Artificial pollination. Therefore, this study aimed to determine the efficiency of Artificial Hybridization between soybean parents according to different periods of the day. Artificial pollination of 14 hybrid combinations occurred in greenhouse in three periods of the day. The parents were: TMG 801, TMG 803, BRSGO 7560, BRS Valiosa RR, Agua-Marinha RR and NK 7059 RR. The studied variables were: relative moisture, air temperature, number of days to flowering, performed Artificial pollination, pods without sepal, produced seeds, germinated seeds, hybrid plants and percentage of pods without sepals. Data were submitted to normality and homogeneity of variance test, analysis of variance, Tukey, Scheffe and χ2 tests, and correlation analysis. Six hundred ans seventy-two Artificial pollinations were performed. From which were obteined 436 pods without sepals and approximately 90% of produced seeds was hybrid. The results indicated that Artificial pollinations performed in January, with parent used in this study, were more efficient in the period from 10:00 a.m. to 12:00 a.m., with mean relative moisture of 34.1% and mean temperature of 38.5 oC and 2:00 a.m. to 4:00 p.m. with 30.7% and 41.6 oC respectively for relative moisture and means of temperature.
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Efficiency of Artificial Hybridization in soybean during the summer depending on temperature and relative humidity = Eficiência da hibridação Artificial em soja durante o verão depende da temperatura e umidade relativa
Bioscience Journal, 2015Co-Authors: Éder Matsuo, Tuneo Sediyama, Cosme Damião Cruz, Sérgio Hermínio Brommonschenkel, Silvana Da Costa Ferreira, Gustavo Sessa FialhoAbstract:Hybridization is an important improvement method used in the soybean culture. However, there is little information on the recommended relative moisture and air temperature degree for Artificial pollination. Therefore, this study aimed to determine the efficiency of Artificial Hybridization between soybean parents according to different periods of the day. Artificial pollination of 14 hybrid combinations occurred in greenhouse in three periods of the day. The parents were: TMG 801, TMG 803, BRSGO 7560, BRS Valiosa RR, Agua-Marinha RR and NK 7059 RR. The studied variables were: relative moisture, air temperature, number of days to flowering, performed Artificial pollination, pods without sepal, produced seeds, germinated seeds, hybrid plants and percentage of pods without sepals. Data were submitted to normality and homogeneity of variance test, analysis of variance, Tukey, Scheffe and χ2 tests, and correlation analysis. Six hundred ans seventy-two Artificial pollinations were performed. From which were obteined 436 pods without sepals and approximately 90% of produced seeds was hybrid. The results indicated that Artificial pollinations performed in January, with parent used in this study, were more efficient in the period from 10:00 a.m. to 12:00 a.m., with mean relative moisture of 34.1% and mean temperature of 38.5 oC and 2:00 a.m. to 4:00 p.m. with 30.7% and 41.6 oC respectively for relative moisture and means of temperature.
Colin Mcgowan - One of the best experts on this subject based on the ideXlab platform.
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Aspects of natural and Artificial Hybridization between Brown Trout and Atlantic Salmon in Newfoundland
1992Co-Authors: Colin McgowanAbstract:Two projects were undertaken to obtain information at the molecular, organismal and ecological levels of organization concerning the causes and dynamics of natural Hybridization between brown trout (Salmo truttta L.) and Atlantic salmon (Salino salar L.) in Newfoundland. -- (1) Protein electrophoresis and mitochondrial DNA analysis were used to detect the frequency and direction of natural Hybridization between these species in nine Newfoundland rivers. In total, 37 hybrids were discovered in a sample of 792 juvenile fish for a regional frequency of 4.7%. Local frequencies ranged from 0 to 18.7% and were significantly heterogeneous. All of the hybrids sampled were produced from matings between female brown trout and male Atlantic salmon. -- (2) The relative viability of hybrids produced using anadromous brown trout, Atlantic salmon grilse and sexually mature Atlantic salmon parr from a Newfoundland river was investigated. The sperm of sexually mature salmon parr performed equally well compared to anadromous salmon sperm when fertilizing both salmon and trout eggs. Hatching success was high in all crosses and controls. By first feeding, hybrids produced using brown trout eggs had suffered higher mortality and were smaller in size than the reciprocal hybrid and both parental controls. Hybrids produced using salmon eggs exhibited high viability and by first feeding were greater in size than both parental controls. A comparison of hatching time and length of hatching period suggests a paternal influence in embryo development. -- Possible reasons for the breakdown of prereproductive isolating mechanisms between Newfoundland brown trout and Atlantic salmon are considered in light of the contrasting results obtained from the two investigations. Reproductive characteristics of the populations involved appear to have a major influence on the dynamics of Hybridization between these species in Newfoundland. It is proposed that an abundance of sexually mature Atlantic salmon parr in Newfoundland streams is responsible for both the frequency and direction of Hybridization observed in this study. Possible reasons for the differences in viability of reciprocal hybrids and the significance of results with respect to the aquaculture industry are also discussed.
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Artificial Hybridization of Newfoundland brown trout and Atlantic salmon: hatchability, survival and growth to first feeding
Aquaculture, 1992Co-Authors: Colin Mcgowan, William S. DavidsonAbstract:Abstract The relative viability of hybrids produced using anadromous brown trout, Atlantic salmon grilse and sexually mature Atlantic salmon parr from a Newfoundland river was investigated. The sperm of sexually mature salmon performed equally well compared to anadromous salmon sperm when fertilizing both salmon and trout eggs. Hatching success was high in all crosses and controls. By first feeding, hybrids produced using brown trout eggs had suffered higher mortality and were smaller in size than the reciprocal hybrid and both parental controls. Hybrids produced using salmon eggs exhibited high viability and by first feeding were greater in size than both parental controls. A comparison of hatching time and length of hatching period suggests a paternal influence in embryo development. Possible reasons for the differences between reciprocal hybrids and the significance of results with respect to aquaculture are discussed.
Guy G. Teugels - One of the best experts on this subject based on the ideXlab platform.
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A karyological analysis of the Artificial Hybridization between Clarias gariepinus (Burchell, 1822) and Heterobranchus longifilis Valenciennes, 1840 (Pisces; Clariidae)
Journal of Fish Biology, 1992Co-Authors: Guy G. Teugels, C. Ozouf-costz, Marc Legendre, M. ParrentAbstract:A karyological analysis of an Artificial Hybridization (reciprocal crosses) between two African clariid catfish, Clarias gariepinus (Burchell, 1822) and Heterobranchus longifilis Valenciennes, 1840, was performed. C. gariepinus has a standard karyotype of 2n= 56, while H. longifilis has 2n= 52. The hybrids revealed an intermediate karyotype (2n= 54), and it appears as if they have totalized the haploid chromosome number of both parental species, excluding gynogenesis or androgenesis. The hybrid karyotype is considered as aneuploid, although the hybrids proved to be fertile. No variation was found in the hybrids karyotypes.
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A karyological analysis of the artifi Clarias gaviepinus (Burchell, 1822) and Heterobranchus IongzjEs Valenciennes, 1840 (Pisces; Clariidae)
1992Co-Authors: Guy G. Teugels, Marc Legendre, C. Ozouf-costaz, M. ParrentAbstract:A karyological analysis of an Artificial Hybridization (reciprocal crosses) between two African clariid catfish, Clarias gariepinus (Burchell, 1822) and Heterobranchus longifilis Valenciennes, 1840, was performed. C. gariepinus has a standard karyotype of h=56, while H. longifiris has 2n = 52. The hybrids revealed an intermediate karyotype (2n = 54), and it appears as if they have totalized the haploid chromosome number of both parental species, excluding gynogenes.is or androgenesis. The hybrid karyotype is considered as aneuploid, although the hybrids proved to be fertile. No variation was found in the hybrids karyotypes.
