Indian Society of Genetics & Plant Breeding

Genetics of fertility restoration of 'WA' based cytoplasmic male sterility system in rice (Oryza sativa L.) using basmati restorer lines

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Hybrid technology in basmati rice (Oryza sativa L.) is
expected to make a quantum incre<.lse in production and
boost the export of the country. The success in
development of basmati hybrids largely depends on
availability of effective restorers and precise basic
knowledge on the genetics of fertility restoration of such
lines. Study using five diverse restorers and Pusa 3A -
a 'WA' type cytoplasmic male sterile (CMS) line in basmati
background, revealed the fertility restoration to be
governed by two major genes with epistatic interactions
that differed from cross to cross. Restorers PRR 78 and
PRR 73 when crossed with Pusa 3A, segregated in the
ratio of 9:3:4 and 1:1:2 in F
2 and BC l generations,
respectively for pollen and spikelet fertility indicating two
major genes with recessive epistasis involved in fertility
restoration. Crosses Pusa 3A1PRR 72 and Pusa 3A1IR
42266 showed a segregation ratio of 9:6:1 and 1:2:1 in
and BC
l generations, respectively, indicating two major
genes governing fertility restoration showing epistasis
with incomplete dominance. Pusa 3A1IR 48749 gave
segregation ratio of 12:3:1 in F2 and 2:1:1 in BC l generation
showing digenic dominant epistatic interaction.

Keywords: Rice, basmati, genetics, fertility restoration, restorers.


Year: 2002
Volume: 62
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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