Stability of male sterility and fertility restoration in the cms T. timopheevi system in triticale
2006
Goral, H. | Warzecha, T.,Krakow Agricultural University (Poland). Dept. of Plant Breeding and Seed Science | Stojalowski, S.,Szczecin Agricultural University (Poland). Dept. of Genetic and Plant Breeding | Pojmaj, M. | Kurleto, D. | Trabka, A.,DANKO Hodowla Roslin Ltd, Choryn (Poland) | Spiss, L.,Krakow Agricultural University (Poland). Dept. of Plant Breeding and Seed Science
The stability of male sterility of 6 triticale lines and that of restoring fertility of 15 F1 hybrids, obtained from crossing 3 male sterile lines with 5 genotypes, was determined. The studies were carried out in several environments, representing specified conditions. Male sterility/fertility scores were based on the anther development with rate of pollen shedding during anthesis and on seed set in bagged ears. The stability was assessed by a regression coefficient and deviation from regression of grain number per ear and restoration index of individual genotypes to the environment means. Among male sterile inbreds the most stable were cms Salvo and cms 19 (b close to zero). The hybrids exhibited a varying number of grains per ear (19.9-65.0 depending on genotype and environment) which averaged 27.6 percent lower from that in pollinating genotypes. The restoration index of individual hybrids ranged from 50 to 100 percent in various environments. The b coefficient for the number of grains per ear and restoration index ranged from - 0.12 to 1.20 and from 0.27 to 1.72, respectively. The hybrids with cv. Lamberto and Krakowiak as pollinators exhibited the highest fertility and b below one or close to one. The studies show that the fertility restoration should be assessed in different environments. A significant interaction of female line x pollinating genotype for the number of grains per ear indicates that genotype restoration ability should be based on crosses with several female lines
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