A comparison of several procedures for mass selection in winter rye. II. What are the merits of adjusting phenotypic values?
✍ Scribed by I. Bos; S. Hennink
- Book ID
- 104617463
- Publisher
- Springer
- Year
- 1991
- Tongue
- English
- Weight
- 603 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0014-2336
No coin nor oath required. For personal study only.
✦ Synopsis
To get an improved impression of the genotypic value of individual plants the literature suggests to adjust their phenotypic values according to a moving mean correction or by means of an analysis of covariance, where the mean phenotypic value calculated across neighbours is used as the concomitant variable . In the present paper it is shown that the theoretical merits of these adjustments are promising : they eliminate the contribution due to the trend in soil fertility from the phenotypic value . In an experimental verification actual merits did, however, not show up .
It is concluded that interplant competition is the main cause for the failure of the studied adjustments . These may be effective in virtual absence of intergenotypic competition . Thus, in case of single plant selection an extremely low plant density would be required, whereas selection among lines or families would require evaluation by means of multi-row plots .