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  • 1
    Electronic Resource
    Electronic Resource
    Recurrent selection for resistance to Verticillium dahliae in pepper (1990)
    Springer
    Euphytica 47 (1990), S. 79-89 
    Details
    ISSN: 1573-5060
    Keywords: Capsicum annuum ; pepper ; polygenic resistance ; recurrent selection ; source population ; transgression ; Verticillium dahliae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Two cycles of recurrent selection were performed in a population including 7 small fruited varieties of pepper (Capsicum annuum) with low resistance level to Verticillium and resistance to other soilborne pathogens. The collaboration of 7 plant breeders in this work and the use of 2 artificial methods of inoculation allowed screening of numerous plants for resistance to V. dahliae under different conditions. The population was simultaneously improved for resistance to V. dahliae and for resistance to Phytophthora capsici, and at each cycle, intercrosses were performed between all these plants. The general level of resistance to V. dahliae increased continuously during the 2 cycles of seles of selection. Selfed progenies of plants from the 2 cycles displayed a higher resistance than the original parents, whatever the method of inoculation used. This gave evidence of transgressions for resistance. Crosses involving parents that did not seem resistant by themselves also produced transgressive lines, indicating that resistance genes were present but not active in these varieties. The transgressive lines with polygenic resistance to V. dahliae were included into a further breeding program to introduce genes of agronomic value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040367
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Difference between USA and French isolates of tobacco etch virus and pepper mottle virus displayed by doubled haploid line analysis (1993)
    Springer
    Euphytica 72 (1993), S. 23-29 
    Details
    ISSN: 1573-5060
    Keywords: Capsicum species ; plant breeding ; doubled haploid ; tobacco etch virus ; pepper mottle virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Doubled haploid peppers resistant in France to specific strains of tobacco etch virus (TEV) and pepper mottle virus (PeMV) were indexed for resistance to USA strains of TEV and PeMV. The doubled haploids were inoculated when four to six true leaves had developed. The peppers were indexed after an incubation period, and a disease index was calculated. Plants without viral symptoms were reinoculated. Plants challenged to TEV were inoculated four times. Doubled haploids, TEV-resistant in France, were susceptible to the USA strain by the fourth screening. All doubled haploid lines showed TEV symptoms after the fourth inoculation. Two doubled haploids lines, no. 4 and no. 8, had about 6% resistance to TEV after the fourth inoculation. Doubled haploid line no. 5 was 100% resistant to PeMV. The results confirm that the USA PeMV and the USA TEV isolates are different pathotypes than the French ones used originally to screen the doubled haploids. In addition, the use of doubled haploids to identify pathotypes of PeMV and TEV is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023769
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic analysis of broad spectrum resistance to potyviruses using doubled haploid lines of pepper (Capsicum annuum L.) (1996)
    Springer
    Euphytica 88 (1996), S. 231-239 
    Details
    ISSN: 1573-5060
    Keywords: broad spectrum gene ; Capsicum annuum ; PeMV, PVY ; plant virus resistance ; plant necrosis, pepper
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Genetic analysis of resistance to PVY in androgenetic doubled haploid lines, F1, F2 and backcross progenies of the Mexican pepper line, CM 334 (Capsicum annuum L.), was performed. Three reaction types were observed when seedlings were inoculated with several PVY strains of different pathotypes and with an American PeMV strain. Resistant genotypes never showed systemic symptoms although some individuals sporadically developed necrotic local lesions on inoculated cotyledons. Susceptible genotypes exhibited either a typical systemic mosaic or a systemic necrosis that caused the death of the inoculated seedlings. Segregation analyses indicated that resistance to pepper potyviruses in CM 334 is conferred by two genes. The first one, tentatively named Pr4, is dominant and confers the resistance to all now known pathotypes of PVY and to PeMV. The second one, tentatively named pr5, is recessive; it confers only the resistance to common strains of PVY. The systemic necrotic response is conferred by an independent dominant gene, tentatively named Pn1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023895
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Breeding transgressive lines of pepper for resistance to Phytophthora capsici in a recurrent selection system (1990)
    Springer
    Euphytica 51 (1990), S. 141-150 
    Details
    ISSN: 1573-5060
    Keywords: Capsicum annuum ; pepper ; Phytophthora capsici ; pepper root rot ; polygenic resistance ; recurrent selection ; transgressive resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In order to increase the resistance level of pepper (Capsicum annuum) to Phytophthora capsici the main sources of genetic resistance were intercrossed. The parents included 7 varieties from different origins of partial resistance to P. capsici and to other soilborne pathogens. Two cycles of recurrent selection were performed by 7 plant breeders who screened the plants at two developmental stages with various isolates and at two temperatures. Analysis of data revealed a strong influence of the testing conditions on the evaluation of the plants. The level of resistance of the progenies further depended on the pathogen isolate used to screen the plants. Improvement of the whole population was more significant during the first cycle and lines with enhanced level of resistance as compared to the parents i.e. transgressive lines were fixed from the two cycles. These lines were resistant to much higher inoculum concentrations than the original parents and the expression of resistance was stable at high temperature (32°C). These new sources of polygenic resistance were included into a new breeding program to improve the agronomic characters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022445
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    Paper (German National Licenses)
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