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Classification of mapping populations (A) (Xu, 2010) and strategy of population construction through sterile male QTL mapping (B). Pn, parent; F1, filial generation 1; AC, mapping population can be classified into anther culture; BC, backcross population; BIL, backcross inbred line; DH, double haploid; IM, intermating; NIL, near-isogenic line; RIL, recombinant inbred line; TC, testcross; TTC, triple testcross; N5, a sterile male cultivar of L. barbarum.
