Quality effects of rye (Secale cereale L.) chromosome arm 1RL transferred to wheat (Triticum aestivum L.)

Quality effects of rye (Secale cereale L.) chromosome arm 1RL transferred t o wheat (Triticum aestivum L.) were characterised by comparison of a group IR(1B) substitution lines and 1BL.1RS translocation lines. The experimental materials were sister lines derived from the mating Mironovskaya10/NE7060/ /NE80413. 1R(1B) substitution lines were identified by the presence of rye omega- and gamma-secalins among 70% ethanol soluble proteins, combined with the presence of high molecular weight (HMW) secalin proteins in total grai n protein extracts. Genes on 1RL reduced grain weight, grain hardness, Mixo graph time, Mixograph tolerance and SDS sedimentation volumes. 1RL had no e ffect on flour yield or grain and hour protein concentrations. The HMW seca lin proteins encoded by genes on 1RL most probably caused the decline in do ugh strength seen in IR(1B) lines relative to that of 1BL.1RS sister lines. Reduced grain hardness might also be related to the presence of HMW secali ns, although a role for additional, unidentified genes on 1RL could not be discounted. (C) 1999 Academic Press.