Abstract
In wild emmer wheat three different kinds of genes for resistance to yellow rust were found, namely genes causing overall resistance, genes causing adult-plant resistance and genes which induce resistance detectable at higher temperatures. At least eleven different and probably novel major genes for overall resistance to yellow rust were detected. The inheritance of overall resistance genes and temperature-sensitive genes was found to be mainly dominant, while the latter showed an additive gene action as well. Several new sources of resistance to powdery mildew were found. These include overall resistance, true seedling resistance, adult- plant resistance and partial resistance. There proved to be no serious crossing barrier between tetraploid wild emmer and hexaploid bread wheat. It was shown that genes for resistance as well as other positive traits are readily transferable to bread wheat, while the negative traits of wild emmer can be easily removed. Two or three consecutive crosses with bread wheat appeared to be optimal for developing wild emmer-derived germplasm or varieties.
| Original language | English |
|---|---|
| Qualification | Doctor of Philosophy |
| Awarding Institution | |
| Supervisors/Advisors |
|
| Award date | 23 Nov 1989 |
| Place of Publication | Wageningen |
| Publisher | |
| DOIs | |
| Publication status | Published - 23 Nov 1989 |
Keywords
- plant breeding
- disease resistance
- pest resistance
- triticum aestivum
- wheat
- hexaploidy
- somatic hybridization
- interspecific hybridization
- hybrids
- plant pathogenic fungi
- puccinia striiformis
- puccinia