Genetic analysis of hexaploid wheat,Triticum aestivumusing intervarietal chromosome substitution lines—protein content and grain weight
✍ Scribed by G. M. Halloran
- Publisher
- Springer
- Year
- 1976
- Tongue
- English
- Weight
- 408 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0014-2336
No coin nor oath required. For personal study only.
✦ Synopsis
The 21 intervarietal chromosome substitution lines of the cultivar Hope in Chinese Spring were used to analyse the genetic differences between the two cultivars Hope and Chinese Spring in grain protein content and grain weight.
Only one chromosome of 'Hope, 5D', significantly influenced grain protein content of'Chinese Spring'. Its influence was of only minor effect and was to decrease protein content expression of 'Chinese Spring'. It has been postulated that the genetic control of protein content, in this instance, is most likely due to many genes each of small effect.
Five chromosomes of 'Hope' influenced the 1000 grain weight value of normal 'Chinese Spring', all increasing its expression. Chromosomes 1A, 4A and 5B were of major effect and 3A and 6A of comparatively minor effect. A minimal estimate of five genes determines the difference in grain size between these cultivars. The possible evolutionary significance of the contribution of the A genome of bread wheat to grain size determination is discussed. On the basis of certain findings of this study, proposals are made for breeding for increased grain size in hexaploid wheat.