Transfer of additive 'minor-effect' genes for resistance toPuccinia striiformisfromTriticum dicoccoidesintoTriticum durumandTriticum aestivum

摘要

Transgressive segregation for higher resistance to stripe rust (Puccinia striiformis) was found in segregating populations of crosses ofTriticum dicoccoidestimes;Triticum aestivumandT. dicoccoidestimes;Triticum durum. This indicates that additive "minor-effect" gene resistance to stripe rust can be transferred directly from the wild emmer (AABB) to cultivated tetraploid and hexaploid wheats. Since "major-effect" genes for stripe-rust resistance seem to be limited in number,Triticum dicoccoidesappears to be a valuable currently untapped reservoir for additive genes which can be combined with genes existing in the tetraploid and hexaploid wheats.