A previously unidentified gene, Sr23, for resistance to P. graminis in wheat cultivars Selkirk, Exchange, Warden, and possibly Etoile de Choisy is reported. Sr23, which is involved in a necrotic infection type, is closely linked ( <: 0·7 % recombination at P = 0·05) in coupling with Lr16 for resistance to P. recondita which is located in chromosome 4A.
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McIntosh et al. (1973) studied this question.
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