Maintainer and restorer behaviour of some elite inbred lines on different cytoplasmic male sterile sources and inheritance of fertility restoration in sunflower, Helianthus annuus L.

摘要

The development of commercial sunflower hybrids based on new CMS sources is of special interest for reducing the potential risk of vulnerability to pathogens and for increasing geretic diversity. Four CMS lines belonging to two different sources of cytoplasmic male sterility, PET-1 (DCMS- 5 and CMS-234) and ARG (DCMS- 41 and DCMS- 42) were crossed with 25 inbred lines to identify the maintainer or restorer behaviour. Few lines restored fertility for classical petiolaris cytoplasm PET-1. Out of 25 inbreds tested 9 were found to be restorers for PET-1 while 15 inbreds behaved as maintainers and one inbred acted as partial restorer. For ARG Cytoplasm, 8 inbreds out of 25, could restore fertility, 14 inbreds behaved as maintainers and 3 inbreds were found to be partial restorers. Based on the success of fertility restoration 34 Ft were studied for the inheritance of fertility restoration. All the crosses showed monogenie control. From the present study, a few effective restorers could be identified forthe CMS sources, which can be exploited in developing hybrids with better heterosis possessing alternate cytoplasm.