VII. 3. Autotetraploid stocks and improved strains of tetraploid barley.
W. Friedt. Department of Plant Genetics of the Gesellschaft fur Strahlenund Umweltforschung mbH., 8059 Grunbach, FRG.
The collection of autotetraploid barley stocks and their corresponding diploids were grown in the field in Grunbach in 1976 and different characters have been recorded as in previous years (see BGN 1, 1971, BGN 4, 1974, BGN 6, 1976). In Table 1, heading dates and various spike characters are summarized. A general impression of the differences in seed set between diploids and tetraploids is given by the frequency distributions of variety-means in Figure 1. In addition to the varieties listed, new autotetraploids have been induced. Limited amounts of seeds of the new strains are available.
Further progress has been made with respect to the improvement of seed set and vitality in our "Diploidisation Program" (see BGN 6, 1976, 103-108). In Table 2, the kernel yield and other yield components of seven selected strains of a trial with 32 variants plus four standard varieties are presented. The maximum increase in yield is 33% as compared to the four original autotetraploid varieties. The major contributors to this improvement are increased fertility and more extensive tillering. All of the 32 strains tested had more than 74% seed set and seven of them (=22%) exceeded 80%. Types of a comparable fertility level are not available in the autotetraploid collection (see Fig. 1). Floret number per spike and Thousandgrainweight (TGW) are higher than the controls in most cases, but not significant.
Table 1, Collection of autotetraploid stocks (page
124)
Table 1, continued, Collection of autotetraploid
stocks (page 125)
Table 1, continued, Collection of autotetraploid
stocks (page 126)
Table 1, continued, Collection of autotetraploid
stocks (page 127)
Table 1, continued, Collection of autotetraploid
stocks (page 128)
Table 1, continued, Collection of autotetraploid
stocks (page 129)
Table 1, continued, Collection of autotetraploid
stocks (page 130)
Table 1, continued, Collection of autotetraploid
stocks (page 131)
Table 2: Kernel Yield and Yield Components of tetraploid
selected strains, 1976
(note, Table 2 left margin truncated in original)
