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  • 1
    Electronic Resource
    Electronic Resource
    Interactions in the pepper-Phytophthora capsici system (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 114 (1995), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: To analyse interactions in the Phytophthora capsici-pepper (Capsicum annuum L.) system, three pepper lines (‘Morrón IN1A 224’, ‘PI201232’ and ‘SCM 334’) with various degrees of resistance to P. capsici and three P. capsici isolates with increasing aggressiveness were used. Inoculations were made when plants had 4–6 leaves, either by irrigating the culture substrate with P. capsici zoospore suspensions at increasing concentrations of up to 3 × 105/ml, or by adding mycelial suspension. P. capsici isolate ‘Ca’ was the least aggressive, followd by ‘8303’ and ‘Bl’. The logistic function was appropriate to describing cumulative mortalities of pepper seedlings inoculated with different P. capsici zoo-spore concentrations. The inoculum concentration required for 50% mortality classified pepper lines as susceptible (‘Morrón INIA224’) and resistant (‘PI201232’ and ‘SCM334’), the former being less resistant than the latter. Isolates ‘Ca’ and ‘8303’ caused very different mortalities both with zoospore and mycelial inoculations, which allowed them to be classified as belonging to two different vertical pathotypes (PO and PI). Isolate ‘Bl’ acted similarly to isolate ‘8303’ when inoculated on ‘Morrón’ and ‘SCM334’, but its behaviour was dependent on zoospore concentration when inoculated on ‘PI201232’. It also proved to be similar to ‘Ca’ using mycelial inoculation. As the case of ‘Bl’ would not be an exception among P. capsici isolates, the two vertical pathotypes PI and PO would be the higher (isolate ‘8303’) and lower (isolate ‘Ca’) limits of a range of aggressiveness. Although there are cases of host-parasite interaction, absence of interaction seems to be the rule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1995.tb00763.x
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  • 2
    Electronic Resource
    Electronic Resource
    Genetics of Resistance to Phytophthora capsici in the Pepper Line ‘SCM-334’ (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 107 (1991), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In order to establish a genetic model of the resistance to Phytophthora capsici in Capsicum annuum genotype ‘SCM-334’, two experiments were conducted which included ‘SCM-334’, as well as, the susceptible line ‘Morrón INIA 224’ and their Fl, F2, F3 and BC1 generations. We also tried to introgress a recessive gene, hypothetically responsible for resistance to P. capsici, from ‘SCM-334’ into ‘Morrón INIA 224’. Inoculations were made, when plants had 4—6 leaves, by irrigating the culture substrate with a zoospore suspension of P. capsici isolate ‘Bl’. The χ2 test was applied to segregating generations to determine how many genes were involved in resistance. The hypothesis which explained the obtained segregations best, although not completely, was one that assumes 3 genes in ‘SCM-334’;, with at least 3 alleles in the heterozygous condition or 4 at any position, present in any genotype in order to be resistant. The influence of the isolate's aggressiveness and the inoculation method on the results are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1991.tb00527.x
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic Relationships Among Four Pepper Genotypes Resistant to Phytophthora capsici (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 108 (1992), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: According to our previous investigations, resistance to Phytophthora capsid in Capsicum annuum genotypes, ‘Line 29’, ‘PI201232’, ‘PI201234’ and Serrano Criollo de Morelos 334 (‘SCM334’), seems to be controlled by three genes. In order to determine the genie relationships between these four sources of resistance, three experiments were conducted which included the four genotypes, their F1s, F2s, F3s and BC1 generations together with the susceptible pepper genotype ‘Morron INI A 224’. Inoculations were made, when plants had 4—6 leaves, by irrigating the culture substrate with a zoospore suspension of P. capsici isolate ‘Bl’. Though the four genotypes showed percentages of resistance close to a 100%, none of them actually reached this level in the three experiments. ‘SCM334’ was the most resistant genotype, transmitting a high level of resistance to its F1, F2 and BQ generations. ‘Line 29’ was more resistant than ‘PI201232’ and ‘PI201234’. However, the F1 F2 and BQ generations of these three lines showed similar degrees of resistance. The four genotypes seem to have one of the three genes postulated for their resistance in common. All genes displayed a similar level of resistance, except the specific genes of ‘SCM334’, the effect of which was slightly higher. Several working procedures are suggested for breeding programmes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1992.tb00110.x
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