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This work aimed to identify the quantitative trait loci (QTL) associated with photosynthesis and growth and productivity traits of soybean and to study possible associations between these traits by the analysis of coincidence of QTL in linkage groups (LGs). Thus, populations of recombinant inbred lines (RILs) of the F7 and F8 generations derived from the cross between the varieties BARC-8 and Garimpo were used. The traits evaluated were net assimilation rate of CO2 under saturating light (Asat), potential photosynthesis rate (Pmax), leaf area (A), specific leaf area (SLA), specific leaf nitrogen (N); root (W R), nodule (W N), stem (W ST), leaf (W L), pod (W P) and plant dry mass (W T); nodule (nN), seed (n s), and pod number (nP); seed fresh mass per plant (W S), one-hundred seed fresh mass (W HS) and seed protein percentage (P%). It was possible to identify the following QTL associated with the following soybean traits: SLA, Asat, N, W R, W ST, W L, W T, W P, W HS, n s and nP, indicating that the RIL population has a great potential for mapping loci associated with quantitative traits of the soybean crop. The correlations between the soybean traits were partially confirmed by coincidence of QTL. Este trabalho objetivou identificar locos de carateres quantitativos (QTLs) assosciados com fotossíntese, crescimento e produtividade de soja com a finalidade de identificar possíveis associações entre estas características pela análise de coicindência de QTLs nos respectivos grupos de ligação (GL). Para isto, foram usadas populações de linhagens recombinantes endogâmicas (RILs) das gerações F7 e F8 derivadas dos cruzamentos entre as variedades BARC-8 e Garimpo. As características avaliadas foram taxa de assimilação líquida de CO2 sob luz saturante (Asat), taxa de fotossíntese potencial (Pmax), área foliar (A), área foliar específica (SLA), nitrogênio foliar específico (N); número de nódulos (nN), sementes (n s) e vagens (nP); massa fresca de sementes por planta (W S), massa fresca de 100 sementes (W HS) e percentagem de proteína da semente (P%). Foi possível identificar os seguintes QTLs associados com as características: SLA, Asat, N, W R, W ST, W L, W T, W P, W HS, n s e nP, indicando que as populações de RIL apresentam grande potencial para mapeamento de locos associados com caracteres quantitativos em soja. As correlações entre os caracteres analisados foram parcialmente confirmadas pela coincidência de QTL

Use of the QTL approach to the study of soybean trait relationships in two populations of recombinant inbred lines at the F7 and F8 generations