Restoration behavior of 20 CMS sources in combination with 11 restorer lines has been studied. Genetic mechanism of fertility restoration was determined for all investigated CMS sources. Three groups of CMS sources were distinguished in dependence of the exhibited differences in restoration response from CMS-Rf PET1 system. The group of alternative CMS sources that exhibited regular restoration effect in crosses with different fertility restorers but completely failed to restore fertility in crosses with PET1 restorer lines represents material of practical value. When discovered, these new CMS sources will permit to use new CMS-Rf systems in sunflower breeding.
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Chepurnaya et al. (2003) studied this question.
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