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  • Solanum demissum  (5)
  • Springer  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Wild tuber-bearing species ofSolanum and incidence ofPhytophthora infestans (Mont.) de Bary on the Western slopes of the volcano Nevado de Toluca. 2. Distribution ofPhytophthora infestans (1990)
    Springer
    Potato research 33 (1990), S. 341-347 
    Details
    ISSN: 1871-4528
    Keywords: late blight ; Solanum demissum ; S. verrucosum ; altitude
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary An area of 15 000 ha on the Western slopes of the volcano Nevado de Toluca was surveyed during 1982–1986. The occurrence of late blight (Phytophthora infestans) was studied in 1986 along five long (7–10 km) transects from an altitude of 2900 m to 3900 m, the upper limit ofSolanum demissum (dms) and in all years in some other sites. Late blight was confined to scattered pockets, 100–500 m in diameter, separated by several kilometers. In 789 colonies of wildSolanum spp., each consisting of 4 to 〉100 plants per colony ofdms, verrucosum (ver), iopetalum, brachycarpum, × edinense, stoloniferum or one unidentified species, symptoms were found in 10% of the colonies or less than 1% of the plants in each colony. Plants had few (1–2) lesions which did not affect vigour. No infected tubers were found. Most (64%) of the infected colonies were ofdms, the predominant species (69%). Colonies ofver were less frequent (11%) and 17% were infected. No infected plants were found in the unidentified species, thought to bedms×ver.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02359308
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  • 2
    Electronic Resource
    Electronic Resource
    Wild tuber-bearing species ofSolanum and incidence ofPhytophthora infestans (Mont.) de Bary on the Western slopes of the volcano Nevado de Toluca. 3. Physiological races ofPhytophthora infestans (1990)
    Springer
    Potato research 33 (1990), S. 349-355 
    Details
    ISSN: 1871-4528
    Keywords: late blight ; Solanum demissum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A survey of races ofPhytophthora infestans was made in 1985 and 1986 on the western slopes of the volcano Nevado de Toluca, Mexico. Isolates were collected from infected plants of wildSolanum species found in five long (7–10 km) and some short (300–500 m) transects. The study are of 15 000 ha was between 2900 and 3900 m altitude. Isolates were collected fromSolanum demissum (35 isolates),verrucosum (11),iopetalum (2),brachycarpum (7),stoloniferum (2), r-genotype (9) and from differential hosts (11). No isolate was identified as race 0. Ten virulence genes were identified with a set of differential hosts and the most common were numbers 2 and 4. Isolates with eight virulence genes were the most common and those with ten were found on eight occasions in the natural habitat and on three in the experimental fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02359309
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  • 3
    Electronic Resource
    Electronic Resource
    Wild tuber-bearing species ofSolanum and incidence ofPhytophthora infestans (Mont.) de Bary on the western slopes of the volcano Nevado de Toluca. 1.Solanum species (1989)
    Springer
    Potato research 32 (1989), S. 181-195 
    Details
    ISSN: 1871-4528
    Keywords: Solanum demissum ; S. verrucosum ; S. iopetalum ; S. brachycarpum ; S. x edinense ; S. stoloniferum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary During the period 1982–87, wildSolanum species were surveyed in an area of 15000 ha by observations and collections along five long (10 km) transects covering altitudes from 2900 to 3900 m, and twelve short (300 m) transects. The sevenSolanum species,demissum (dms), verrucosum (ver), iopetalum, brachycarpum, x edinense, stoloniferum and an unidentified species, possibly a sterile hybrid betweendms andver, grew patchily and their many small colonies formed part of a complex plant community that changed in composition with altitude and topography. The most frequent species wasdms (80%), while other species often grew in mixed colonies with it. As the altitude increased, so did the distances between colonies, whereas species diversity decreased and above 3500 m onlydms was found. Most species propagated both clonally, through tubers on long stolons, and sexually through botanical seed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358231
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  • 4
    Electronic Resource
    Electronic Resource
    Wild tuber-bearing species ofSolanum and incidence ofPhytophthora infestans (Mont.) de Bary on the Western slopes of the volcano Nevado de Toluca. 4. Plant development in relation to late blight infection (1990)
    Springer
    Potato research 33 (1990), S. 469-478 
    Details
    ISSN: 1871-4528
    Keywords: Solanum demissum ; S. verrucosum ; growth stages
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Development of plants ofSolanum demissum (dms) andSolanum verrucosum was followed in three sites at altitudes of 2950, 3250 and 3500 m, and the incidence of late blight and physiological races determined. No plants were found that had grown from true seed although berry formation was abundant indms. Tubers sprouted during the dry period and most shoots emerged at the beginning of the rainy season in late April. Emergence continued for about two months indms, and new plants were later formed from stolons, so that plants of different ages were present at the same time. Late blight was first found in cultivated fields adjacent to the site at 2950 m, and three weeks later lesions were found in wildSolanum species (WSS) simultaneously at all sites. Few plants per colony of WSS were infected and none was seriously damaged. Complex races (6–10 virulence genes) were found early in the season at one locality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358025
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  • 5
    Electronic Resource
    Electronic Resource
    Wild tuber-bearing species ofSolanum and incidence ofPhytophthora infestans (Mont.) de Bary on the Western slopes of the volcano Nevado de Toluca. 5. Type of resistance toP. infestans (1990)
    Springer
    Potato research 33 (1990), S. 479-486 
    Details
    ISSN: 1871-4528
    Keywords: specific resistance ; general resistance ; late blight ; Solanum demissum ; Solanum verrucosum ; Solanum iopetalum ; Solanum brachycarpum ; Solanum x edinense
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Plants of wildSolanum species (S. demissum (dms), S. verrucosum (ver), S. iopetalum (iop), S. brachycarpum (bra), and an unidentified species (unsp), from the natural habitat were inoculated in the laboratory withPhytophthora infestans race 0, to see if major genes for resistance were present, and with the most complex and aggressive race available in an attempt to reveal the level of general resistance. No plant with a susceptible reaction to race 0 was found in 120 plants ofdms, and 34 plants ofunsp. Plants with a hypersensitive reaction to race 0 and susceptible plants were found inver. When infected with a complex aggressive isolate of the fungus 73.5% of the WSS plants were susceptible. It was concluded that WSS in the area possess both complex race specific resistance and a high level of general resistance, whose effects cannot yet be separated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358026
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