Abstract
Inheritance of fertility restoration was studied in crosses involving ten elite restorer lines of rice viz. BR827R, BR168R, BR6723-1-1-2R, M.H.63R, M.H.77R, Gui99R, IR40750R, IR64R, AjayaR and IR44675R and one male sterile line II32A with ID (Indonesian paddy type) sources of cytoplasmic male sterility. The segregation pattern for pollen fertility of F2 and BC1 populations of crosses involving II32A indicated the presence of two independent dominant fertility restoring genes. The mode of action of the two genes varied in different crosses revealing three types of interaction, i.e. epistasis with dominant gene action, epistasis with recessive gene action, and epistasis with incomplete dominance.SAARC J. Agri., 13(1): 207-215 (2015)
Highlights
Precise understanding of genetics of fertility restoration is useful in planning a sound breeding strategy for development of superior restorers in a hybrid breeding program
Plants with more than 60% fertility pollen were grouped as fully fertile (FF), those with 30-60% fertile partial fertile (PF), those having 1-30% fertile pollen as partial sterile (PS) and those which had 0% were grouped as completely sterile (CS) under an optical microscope
Spikelet fertility of the same cross combinations ranged from 74- 82% and suggested that pollen fertility little bit differ with spikelet fertility at the time of maturity
Summary
Precise understanding of genetics of fertility restoration is useful in planning a sound breeding strategy for development of superior restorers in a hybrid breeding program. It may help in the efficient transfer of restorer genes into other agronomical desirable genotypes. In rice several sources of cytoplasmic genetic male sterility (CMS) have been reported (Virmani and Edwards, 1983). Extensive research work on identification of restorers and maintainers and on inheritance of fertility restoration has been done on the WA (Wild Abortive) type cytoplasmic source only. Cytoplasmic male sterility (CMS), which causes the production of non-functional pollen and inherited maternally, is important in commercial hybrid seed production (Chen L and Liu YG, 2014)) and breeding program. A number of studies on the relationship between CMS and fertility-restorer
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