Seed parent breeding efficiency of three diverse cytoplasmic-nuclear male-sterility systems in pearl millet uri icon

abstract

  • Pearl millet (Pennisetum glaucum (L.) R.Br.) hybrids, grown widely in India and to someextent in the US, are all based on an A1 CMS source,leaving the pearl millet hybrids vulnerable to potentialdisease or insect pest epidemics. A comparison ofthis CMS system with two additional CMS systems(A4 and A5) in the present study based on isonuclearA-lines (seed parents) and their isonuclear hybridsshowed that A-lines with the A4 cytoplasm had muchfewer pollen shedders and much reduced selfed seedset in visually assessed non-shedding plants as comparedto those with the A1 cytoplasm. A-lines with theA5 cytoplasm had neither any pollen shedders nor didthey set any seed when selfed. This showed that theA5 CMS system imparts complete and most stablemale sterility, followed by the A4 and A1 CMS systems.The frequency of maintainers, averaged acrossa diverse range of 26 populations, was highest for the A5 CMS system (98%), followed by the A4 (59%) andthe A1 (34%) system indicating the greatest prospectsfor genetic diversiWcation of A-lines lies with the A5cytoplasm, and the least with the A1 cytoplasm. Meangrain yield of hybrids with the A1 cytoplasm was 5%more than the A4-system hybrids, while there was nodiVerence between the mean grain yield of hybridsbased on A1 and A5 CMS systems. Based on theseresults, it is suggested that seed parents breedingeYciency will be the greatest with the A5 CMS system,followed by the A4 CMS system, and least withthe currently commercial A1 CMS system

publication date

  • 2009
  • 2009