| Genetical investigation on Triticum vulgare
x Secale cereale hybrid I. Study of some transgressive characters of the culm and ear in the F4 generation M. KUMP Department of Plant Breeding and Genetics University of Zagreb, Yugoslavia In 1951, Triticum vulgare muticum var. miliurum "M 1830" was pollinated by mixture of pollen of Secale cereale. From these pollinations four kernels were obtained and only one of them germinated. From this seed the F1-gen. plant T. vulgare x Secale cereale developed. The wheat parent "M 1830" is a uniform, constant, true-breeding, midseason and winter hardy genotype with tall stem and glabrous peduncles. The glumes are glabrous and reddish, and the kernels are dark reddish and ovate with a high 1,000 kernel weight. The rye strains used for pollination are uniform, constant, midseason and winter hardy varieties with tall stems, white glumes, greenish grey kernels. The peduncles below the head have a dense coat of hair, "hairy neck" for a distance of about 3 cm. The plant of the F1 generation was back-crossed with the wheat parent "M 1830". Seeds obtained by back-crossing germinated well and gave plants of the F2 generation. F2 gen. plants were selfed and from obtained seeds F3 gen. progenies were cultivated in a completely isolated place. Seed from single F3 gen. plant was sown in separate rows and spaced 10 cm apart in rows 20 cm apart For control the wheat parent "M 1830" was grown in the same way. The F4 gen. consisted of 1,538 plants. After maturity observations and measurements were made on each plant. For statistical analysis the plants were grouped in progenies to their origin from plants of F3 resp. F2 generation. On the basis of segregation in the F4 gen., and from the occurrence of transgression of some investigated characters in connection with the "hairy neck" and "smooth neck" character respectively, it may be pointed out as follows: 1) The presence of the I rye chromosome or part of it in the genome seems to have no influence on the degree of tillering because there are, in comparison with the wheat parent, some positive transgressive variants with a "smooth neck" as well as with a "hairy neck". |
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