IV. 14. Autotetraploids.

W. Friedt, Biologische Bundesanstalt fur Land- und Forstwirtschaft, Institut für Resistenzgenetik, D-8059 Grünbach, Federal Republic of Germany.

A. Old collection
The collection of more than 160 autotetraploid spring barley stocks has been maintained as reported in previous years (BGN 1, 4, 6, 7, 8, 10; see Friedt 1980). In contrary to the report in BGN 10, 1980, the whole collection will be grown again at Grünbach in 1981 for seed multiplication. Afterwards, a sample of approximately 10,000 seeds of each of the stocks will be transferred for long-term storage to the German Genebank: Institut für Pflanzenbau der FAL, D-3300 Braunschweig.

B. New autotetraploid stocks
A number of new tetraploid two-row spring barley stocks have been added to the collection in 1980. These tetraploids arose spontaneously from anther-culture of F1 plants of the crosses listed in Table 1 (see Foroughi-Wehr and Friedt 1981). Agronomic characters of the new stocks will be described later on.

Table 1. Seed set of 15 tetraploid barley crosses in F2 (1978) as compared to their respective best parent

C. New tetraploid crosses
Following the 'diploidisation method' described by Gaul and Friedt (1976) a number of new crosses of tetraploid spring barley stocks have been carried out after various mutagenic treatments with X-rays and/or EMS. In Figure 1 the frequency distribution for seed set of 15 different two-row complex-crosses (144 Fl-plant progenies) is given as compared to the distribution of 29 parents. It is evident that a number of cross-progenies exceeds the best parents with regard to seed setting. In Table 2 the mean seed set of the individual crosses is compared with the mean value of the respective best parent. Five out of 15 crosses are significantly^X) to their best parent. The best plant progenies of the best crosses will be grown again in 1981 for further selection regarding seed set as well as tillering ability.

Table 2. New autotetraploid barley stocks produced via anther-culture of crosses in F1.

Fig. 1. Frequency distributions for seed set of tetraploid two-rowed spring barley crosses in the F3-generation and their parents.

Seed samples of all of the tetraploid stocks are free for distribution.

References:

Foroughi-Wehr, B. and W. Friedt. 1981. Responsiveness to anther culture of Hordeum vulgare cv. 'Dissa' and its parents. BGN 11:50-53.

Friedt, W. 1980. Coordinator's Report: Autotetraploid. BGN 10:93.

Gaul, H. and W. Friedt. 1976. Progress in the diploidisation of autotetraploid barley. In: Barley Genetics III, Proc. 3rd Int. Barley Genet. Symp., Garching 1975, 378-387.

BGN 11 toc
BGN Main Index