Outcrossing in Winter Triticale, Measured by Occurence of Tall Plants
Studies were undertaken to determine outocrossing rate for 11 varieties and 4 strains of Polish winter triticale and French variety Clercal. Experiment were carried out in 1988–1991. The outcrossing rate was defined as percent of hybrid plants in populations of about 4000 individuals. Long stemmed, 32–40 cm taller than tested varieties, homozygotic triticale line RAH-108/84 was used as outcrossing test. Long stem of tester line is controlled by a single dominant gene. In order to mach flowering period of tester line, tester was spaciously grown. Results of the experiments revealed differences between tester genotypes; the outcrossing rate ranged from 1.1% to 10.5% depending on variety and weather conditions. Less likely to outocross varieties did reacted to the weather conditions (not significant differences between the years). Only high outcrossing rate of Almo and Lasko varieties was increased by warm and dry weather. Outcrossing rate of the tested varieties was strongly reduced by space isolation, 3 m wide space isolation reduced outcrossing rate by nearly 4 times. We suggest applying space isolation starting from early breeding stages of triticale, when material is multiplicated in small plots, and using only inside plot plants for seed multiplication. This method would reduce time needed for achieving uniformity of triticale strains.
KeywordsTest Line Hybrid Plant Polish Variety Single Dominant Gene Tall Plant
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