Indian Society of Genetics & Plant Breeding

Genetics of fertility restoration of diverse cytosterile sources in rice (Oryza sativa L.)

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The availability of stable cytoplasmic male sterility and
fertility restoring system is vital for commercial
exploitation of heterosis in rice. Inheritance study using
four effective fertility restorers (BL-184-AR, IR-54742-22-
19-3, NVSR-20 and Pusa Sugandha-5) and five diverse
cytosterile sources (KJTCMS-6A-WA, RTN 2A-ARC, RTN
3A-Mutant of IR 62829B, RTN 13A-Gambiaca and RTN 17ADissi), their F1, F2 and BC1 populations revealed that the
fertility restoration was governed by two independent
genes, one of which appeared to be stronger in action
than other. Crosses KJTCMS-6A X IR-54742-22-19-3, RTN-
2A X BL-184-AR and RTN-2A X NVSR-20, RTN-3A X BL-
184-AR and RTN-13A X NVSR-20, showed segregating
ratio of 12 (fertile) : 3 (partially fertile + partially sterile): 1
(completely sterile plants) and 2 (fertile) : 1 (partial sterile/
fertile) : 1 (sterile) in F2 and BC1 generations respectively,
for pollen and spikelet fertility indicating two major genes
with dominant epistasis. In case of crosses KJTCMS-6A
X BL-184-AR and KJTCMS-6A X NVSR-20, RTN-13A X BL-
184-AR, RTN-17A X BL-184-AR segregated in the ratio of
9:6:1 and 1:2:1 in F2 and BC1 generations respectively, for
pollen and spikelet fertility indicating two major genes with
epistasis and incomplete dominance. While crosses,
KJTCMS-6A X Pusa Sugandha-5, RTN-2A X IR-54742-22-
19-3 and RTN-2A X Pusa Sugandha-5, RTN-3A X IR-54742-
22-19-3, RTN-3A X Pusa Sugandha-5 and RTN-3A X NVSR-
20, RTN-13A X IR-54742-22-19-3, RTN-13A X Pusa
Sugandha-5 and RTN-17A X IR-54742-22-19-3, RTN-17A X
Pusa Sugandha-5, RTN-17A X NVSR-20, exhibited the
restoration pattern fitted well in a segregation ratio of 9:3:4
and 1:1:2 in F2 andBC1 generations respectively, for pollen
and spikelet fertility displaying an epistasis with recessive
interaction. The mode of action of these genes were
different in different restorer combinations with five
different sources of cytoplasmic genetic male sterility.
Change in fertility restoration by same restorer with CMS
line of same source and of different source could either
due to cytoplasmic genetic interactions of CMS line and fertility restoring genes or may be affected by modifier

Keywords: Inheritance, fertility restoration, CMS source, pollen and spikelet fertility, restorers


Year: 2011
Volume: 71
Issue: 1
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906


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