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Inheritance and genetic mapping of resistance to Asian soybean rust in cultivar TMG 803
This study analyzed the inheritance and identified microsatellite markers linked to the resistance gene to Phakopsora pachyrhizi in soybean cultivar TMG 803. Hybridization between the cultivars TMG 803 and BRS Valiosa RR was performed to obtain F1 progenies and the F2 population. The response of the...
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Published in: | Crop breeding and applied biotechnology 2014-12, Vol.14 (4), p.209-215 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | This study analyzed the inheritance and identified microsatellite markers linked to the resistance gene to Phakopsora pachyrhizi in soybean cultivar TMG 803. Hybridization between the cultivars TMG 803 and BRS Valiosa RR was performed to obtain F1 progenies and the F2 population. The response of the parents 'TMG 803' and 'BRS Valiosa RR' to P. pachyrhizi was, respectively, resistant and susceptible, and among the 116 F2 plants,93 were resistant and 23 susceptible, under natural infection and field conditions. It was found that the resistance of cultivar TMG 803 is controlled by one gene with complete dominance, mapped as resistance locus Rpp4 of linkage group G. Of the 16 tested, one microsatellite marker, sc21_3420, was completely linked to the resistance gene (distance 0.0cM) and the favorable allelic form was present in cultivar TMG 803, which may therefore be useful in assisted selection in segregating populations.
Objetivou-se analisar a herança e identificar marcadores microssatélites ligados ao gene de resistência da 'TMG 803' à Phakopsora pachyrhizi. Foi realizada hibridação entre as cultivares TMG 803 e BRS Valiosa RR para obtenção da progênie F1 e população F2. Os genitores 'TMG 803' e 'BRS Valiosa RR' comportaram-se, respectivamente, como resistentes e suscetíveis e entre as 116 plantas F2, 93 comportaram-se como resistentes e 23 como suscetíveis à P. pachyrhizi, submetidas à infecção natural, em condições de campo. Verificou-se que a resistência da cultivar TMG 803 é governada por um gene com dominância completa, mapeado como o loco de resistência Rpp4, do grupo de ligação G. Dentre os 16 marcadores microssatélites testados, um marcador, sc21_3420, encontrou-se completamente ligado ao gene de resistência (distância de 0,0cM) estando a forma alélica favorável presente na cultivar TMG 803, podendo, portanto, ser útil na seleção assistida em populações segregantes. |
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ISSN: | 1984-7033 1518-7853 1984-7033 |
DOI: | 10.1590/1984-70332014v14n4a33 |