Results 131 to 140 of about 802 (163)
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Euphytica, 1971
Two selected hexaploid F1 clones from the cross Solanum acaule x S. bulbocastanum were intercrossed and the resulting hybrid plants pollinated with the diploid species S. phureja, in order to obtain tetraploid triple hybrids with the same ploidy level as S. tuberosum cultivars (2n=4x=48).
M. S. Ramanna, J. G. Th. Hermsen
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Two selected hexaploid F1 clones from the cross Solanum acaule x S. bulbocastanum were intercrossed and the resulting hybrid plants pollinated with the diploid species S. phureja, in order to obtain tetraploid triple hybrids with the same ploidy level as S. tuberosum cultivars (2n=4x=48).
M. S. Ramanna, J. G. Th. Hermsen
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Euphytica, 1971
The colchicine-induced hexaploid (2n=72) from the male-sterile triploid hybrid Solanum polytrichon x S. phureja is also male sterile with the tetrad type of male sterility as is the case with its triploid counterpart. The chromosome pairing in hexaploids is almost regular with an average of 0.3 IV, 0.2 III, 32.2 II and 5.8 I per cell.
M. M. F. Abdalla, M. S. Ramanna
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The colchicine-induced hexaploid (2n=72) from the male-sterile triploid hybrid Solanum polytrichon x S. phureja is also male sterile with the tetrad type of male sterility as is the case with its triploid counterpart. The chromosome pairing in hexaploids is almost regular with an average of 0.3 IV, 0.2 III, 32.2 II and 5.8 I per cell.
M. M. F. Abdalla, M. S. Ramanna
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Annals of Applied Biology, 1988
SUMMARYThe frequency of dihaploid production following the interspecific pollination of Solanum tuberosum clones with Solanum phureja has been investigated. Seventeen hybrid combinations were tested and the crosses differed significantly in the number of seed produced, the proportions that were viable and the proportions that were dihaploid.
P. D. S. CALIGARI +4 more
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SUMMARYThe frequency of dihaploid production following the interspecific pollination of Solanum tuberosum clones with Solanum phureja has been investigated. Seventeen hybrid combinations were tested and the crosses differed significantly in the number of seed produced, the proportions that were viable and the proportions that were dihaploid.
P. D. S. CALIGARI +4 more
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Plant Breeding, 2006
AbstractPotato tuber blight is a disease caused by the oomycete Phytophthora infestans (Mont.) de Bary. Due to the significant economic impact of this disease, introgression of durable resistance into the cultivated potato is one of the top priorities of breeding programmes worldwide.
I. Simko +4 more
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AbstractPotato tuber blight is a disease caused by the oomycete Phytophthora infestans (Mont.) de Bary. Due to the significant economic impact of this disease, introgression of durable resistance into the cultivated potato is one of the top priorities of breeding programmes worldwide.
I. Simko +4 more
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American Potato Journal, 1994
Samples of 4285 individuals from a hybridSolanum phureja Juz. et Buk. —S. stenotomum Juz. (Phu-Stn) and 105 individuals ofSolanum phureja (Phu) diploid potato populations were twice inoculated with potato virus Y strain “o” (PVY∘) using the air brush technique. After discarding seedlings with PVY visual symptoms both in the greenhouse and in the field,
Roger L. Vallejo +4 more
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Samples of 4285 individuals from a hybridSolanum phureja Juz. et Buk. —S. stenotomum Juz. (Phu-Stn) and 105 individuals ofSolanum phureja (Phu) diploid potato populations were twice inoculated with potato virus Y strain “o” (PVY∘) using the air brush technique. After discarding seedlings with PVY visual symptoms both in the greenhouse and in the field,
Roger L. Vallejo +4 more
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American Journal of Potato Research, 2008
Acceptable chip color and high specific gravity are important characteristics for chipping potatoes. High specific gravity in US chipping varieties traces back to B5141-6 (Lenape). In an effort to expand the germplasm base for high specific gravity, a long-day adapted diploid hybrid Solanum phureja–S.
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Acceptable chip color and high specific gravity are important characteristics for chipping potatoes. High specific gravity in US chipping varieties traces back to B5141-6 (Lenape). In an effort to expand the germplasm base for high specific gravity, a long-day adapted diploid hybrid Solanum phureja–S.
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American Journal of Potato Research, 2009
A diploid hybrid Solanum phureja x S. stenotomum population that has shown relatively high levels of quantitative resistance to late blight was used to develop polymerase chain reaction (PCR)-based markers for marker-assisted selection (MAS) of disease resistance in potato breeding.
W. M. D. K. Wickramasinghe +4 more
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A diploid hybrid Solanum phureja x S. stenotomum population that has shown relatively high levels of quantitative resistance to late blight was used to develop polymerase chain reaction (PCR)-based markers for marker-assisted selection (MAS) of disease resistance in potato breeding.
W. M. D. K. Wickramasinghe +4 more
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American Journal of Potato Research, 2018
Increasing levels of foliar resistance to late blight, caused by Phytophthora infestans, have previously been reported through two cycles of recurrent maternal half-sib selection in a diploid hybrid population of Solanum phureja-S. stenotomum. The objective of this study was to determine if continued improvements for resistance to late blight could be ...
Kathleen G. Haynes, Xinshun Qu
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Increasing levels of foliar resistance to late blight, caused by Phytophthora infestans, have previously been reported through two cycles of recurrent maternal half-sib selection in a diploid hybrid population of Solanum phureja-S. stenotomum. The objective of this study was to determine if continued improvements for resistance to late blight could be ...
Kathleen G. Haynes, Xinshun Qu
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American Journal of Potato Research, 2013
Foliar late blight, caused by Phytophthora infestans, is an important disease problem worldwide. Foliar resistance to late blight was found in a hybrid population of the cultivated diploid species Solanum phureja-S. stenotomum (phu-stn). The objective of this study was to determine if resistance to late blight could be improved by recurrent maternal ...
Kathleen G. Haynes +2 more
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Foliar late blight, caused by Phytophthora infestans, is an important disease problem worldwide. Foliar resistance to late blight was found in a hybrid population of the cultivated diploid species Solanum phureja-S. stenotomum (phu-stn). The objective of this study was to determine if resistance to late blight could be improved by recurrent maternal ...
Kathleen G. Haynes +2 more
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Acta Agronomica Hungarica, 2010
Potato,Solanum tuberosumL. (2n = 4x = 48), is an autotetraploid species, the breeding of which at the tetraploid level is complicated by tetrasomic inheritance. Dihaploids (2n = 2x = 24) from the tetraploid cultivated potato have great potential for breeding and genetic studies.
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Potato,Solanum tuberosumL. (2n = 4x = 48), is an autotetraploid species, the breeding of which at the tetraploid level is complicated by tetrasomic inheritance. Dihaploids (2n = 2x = 24) from the tetraploid cultivated potato have great potential for breeding and genetic studies.
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