Identification of male fertility restorers for the Pampa cytoplasm among inbred lines of rye with different origins
Irena Kolasińska
i.kolasinska@ihar.edu.plZakład Genetyki i Hodowli Roślin, Instytut Hodowli i Aklimatyzacji Roślin — Państwowy Instytut Badawczy w Radzikowie (Poland)
Abstract
The objective of this study was to identify effective male fertility restorers among rye genotypes developed from Polish breeding populations and Turkish landrace populations. In the years 2009 and 2010, restoring ability of numerous inbred lines developed from both groups of rye populations was studied. Single plants of inbred lines were crossed to a hard-restoration tester (CMS-Tt) under isolation bags. The level of male fertility of test hybrids was assessed in plastic tunnels and/or in field by pollen shedding visual scores of plant plots and/or by anther dehiscence visual scores of single plants with a 1–9 scale. The restoration indices (RI) were calculated according to the formulae: RI = % of male fertile plants + ½×% of partially male fertile plants. It was found, that majority of inbred lines developed from Polish breeding population were only partial restorers. Frequency of effective restorers among the genotypes assessed in 2009 and 2010 was 1.2% and 0.3%, respectively. In contrast, inbred lines derived from Turkish landrace populations were highly effective in restoration of male fertility of their test hybrids. Frequency of effective restorers (RI above 70%) among genotypes assessed in 2009 and 2010 was 48.3% and 82.3%, respectively. In 2010, half of the tested inbred lines proved to be very effective restorers (RI = 100%). Introgression of these inbred lines into the restorer gene pool should result in improved male fertility in Pampa-based rye hybrids.
Keywords:
Secale cereale, hybrid breeding, male sterility, restoration of male fertility, ryeReferences
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Authors
Irena Kolasińskai.kolasinska@ihar.edu.pl
Zakład Genetyki i Hodowli Roślin, Instytut Hodowli i Aklimatyzacji Roślin — Państwowy Instytut Badawczy w Radzikowie Poland
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