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1

Specific resistance to Phytophtora infestans in the potato

100%
Swiezynski K. M., Domanski L., Sieczka M. T., Zarzycka H.
Genetica Polonica
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1993
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vol. 34
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issue 4
327-336
2

Resistance to Phytophthora infestans in diploid and tetraploid potato families. 2. Resistance in tubers

100%
Swiezynski M., Flis B., Osiecka M., Sieczka M. T., Zarzycka H.
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vol. 38
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issue 1
33-44
EN
The tuber reaction to Phytophthora infestans was evaluated in individual genotypes of four diploid and four tetraploid potato families, their parents and standard cultivars. The genotypes were tested several times. Two testing methods were used, based on evaluation of tuber slices or whole tubers, respectively. All inoculations were done with MP 245, a fungus isolate with a broad virulence spectrum. If the reaction of tuber slices was evaluated, the distribution of genotypes in several families deviated considerably from a normal one. In some distributions more than one peak was detectable, indicating segregation of major genes. Genotypes transgressive in resistance were found in four families. If the reaction of whole tubers was evaluated, the distribution of genotypes did not deviate significantly from a normal one. Genotypes transgressive in resistance were found in one family. The tuber reaction to P. infestans depended to a large extent on testing conditions.
3

Marker-assisted selection of diploid and tetraploid potatoes carrying Rpi-phu1, a major gene for resistance to Phytophthora infestans

75%
Sliwka J., Jakuczun H., Kaminski P., Zimnoch-Guzowska E.
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vol. 51
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issue 2
133-140
EN
The Rpi-phu1 gene originates from an interspecific hybrid between Solanum stenotomum and S. phureja, and confers a high level of resistance to Phytophthora infestans (late blight) in potato. The Rpi-phu1 was introduced by crossing at the diploid level into the S. tuberosum gene pool and then transferred to the tetraploid level by means of 2n gametes. Tetraploid lines carrying the Rpi-phu1 were selected for further crosses. A molecular marker GP94, linked in mapping population 97?30 with the Rpi-phu1 (6.4 cM), was applied to other unselected populations (2 diploid and 1 tetraploid), and was shown to be useful in marker-assisted selection (MAS) of the resistant individuals. GP94 was applied also in commercial breeding in 2 tetraploid populations. Although the marker allele of GP94, characteristic for the Rpi-phu1 presence, was rare in the S. tuberosum gene pool, it seemed to be common in 2 other sources of resistance to late blight: S. ruiz-ceballosii and S. kurtzianum.
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