AGRONOMIC AND QUALITY CHARACTERISTICS OF WHEAT LINES WITH LEAF RUST RESISTANCE DERIVED FROM TRITICUM SPELTOIDES

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Abstract
Eleven lines of wheat (T. aestivum L.) carrying resistance to leaf rust (P. recondita Rob. ex. Desm.) derived from 5 accessions of T. speltoides Tausch were grown in yield tests in 1977 and 1979. The grain was tested for quality characteristics in both years. Although the lines had been backcrossed 4 or 5 times to either ''Manitou'' or ''Neepawa'', only 4 of the 11 showed any real promise of equalling their recurrent parent in agronomic and quality characteristics. Lines derived from the same accession of T. speltoides were surprisingly variable. The generally deleterious effects of the transferred chromatin are due either to genes linked to the genes for leaf rust resistance plus incomplete compensation by the T. speltoides chromosome segment for the T. aestivum segment it replaced, or to the effects of additional translocations that were not eliminated during backcrossing. A 2nd cycle of homeologous recombination is proposed as a way to eliminate some of the deleterious genes.

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