QTLs de resistência ao nematoide do cisto da soja, raças 3, 9 e 14 na cultivar Hartwig

FERREIRA, M; CERVIGNI G D L; FERREIRA, A; SCHUSTER I; SANTANA, FA; PEREIRA, WD; DE BARROS,GE; MOREIRA, MA

PESQUISA AGROPECUáRIA BRASILEIRA

EMPRESA BRASIL PESQ AGROPEC

Año: 2011 vol. 46

0100-204X

The objective of this work was to identify major and minor‑effect quantitative trait loci (QTL) forresistance to races 3, 9, and 14 of soybean cyst nematode (SCN) in Hartwig cultivar; to map new resistanceQTLs for these races; and to check for the existence of epistatic interactions between QTLs. Cultivar Hartwigis an important resistance source to SCN. Recombinant inbred lines (RIL) obtained from a cross between´Hartwig´ (resistant) and Y23 (susceptible) were evaluated regarding resistance to the three races. New genomicregions for resistance to SCN were identified by microsatellites. Four QTLs, which explained between 12 and34% of phenotypic variance, were detected for resistance to race 3 in linkage groups (LG) A2, G, J, and M. TheQTL in LG G is also important for resistance to race 9. Epistatic interactions were detected between loci, whichindicate resistance to races 9 and 14. There are high and low‑effect resistance QTLs to SCN.