Indian Society of Genetics & Plant Breeding

Study on floral traits and seed setting in parental lines of hybrid rice during early ahu and kharif seasons

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Two CMS lines, IR 58025A and IR 68888A along with their
maintainers and two fertility restorers, LuitR and IR 36R,
were evaluated for flower and plant characters during early
ahu (February-June) and kharif (July-November) seasons.
IR 58025A showed longer stigmata and styles, and higher
spikelet Length/Breadth (L/B) ratio while IR 68888A showed
broader stigmata and wider glume opening angle in both
the seasons. IR 68888A also exhibited higher pollen sterility
during early ahu. IR 36R was characterized with broad
anthers. LuitR showed longer and broader anthers with
more pollen than others. Plant height, flag leaf length, flag
leaf width and area were higher in IR 36R. Panicle exsertion
was complete in pollen parents whereas it was 78-80% in
CMS lines. The widest flag leaf angle was found in IR 58025B
during early ahu and in IR 36R during kharif. Kharif season
was more favourable for growth of the plants with higher
seed set percentage while floral traits of the CMS lines were
better expressed in early ahu. Manipulation of the seeding
sequence of the parental lines in early ahu is warranted for
better seed set provided the seed crop escapes heavy premonsoon showers during reproductive stage. IR 68888A/
LuitR was a good combination for pollen dispersal and
seed setting.

Keywords: Floral traits, rice hybrids, CMS, maintainer, restorer


Year: 2018
Volume: 78
Issue: 3
Article DOI: 10.31742/IJGPB.78.3.2
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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