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Genetic analysis of tomato internode length via mixed major gene plus polygene inheritance model

Sun, Xiao-Rong, Liu, Lei, Zhi, Xiao-Na, Bai, Jin-Rui, Cui, Ya-Nan, Shu, Jin-Shuai, Li, Jun-Ming
Scientia horticulturae 2019 v.246 pp. 759-764
crossing, genetic analysis, genetic models, heritability, inheritance (genetics), internode length, major genes, plant architecture, quantitative trait loci, seedlings, tomatoes
Internode length is an important factor influencing tomato cultivation and breeding. To investigate the genetic inheritance of tomato internode length, a multi-generation joint analysis of major genes plus polygene model was employed in this study. Six populations (P1, P2, F1, B1, B2 and F2) were obtained from the Heinz1706 (medium internode) × P502 (long internode) and P1609 (short internode) × P502 crosses, respectively. The data of the 30th day seedlings showed that the internode length of two crosses fitted the D-2 model, followed by the one additive major gene plus additive-dominance polygene genetic model. The highest heritability of the major gene was observed in the F2 population (75.92% and 70.16%). However, the internode length of the 40th day seedlings fitted the E-1 model, namely two additive-dominance-epistasis major genes plus additive-dominance polygene genetic model. The heritabilities of the major genes ranged from 34.33% to 78.16% in B1, B2 and F2 populations, while the heritabilities of the polygene were between 1.92% and 24.50%. These results suggested that the tomato internode length was mainly controlled by major gene and should be selected in early populations. Therefore, our findings may provide important information for plant architecture modification of tomato and may lay the foundation for further QTL mapping.