Indian Society of Genetics & Plant Breeding

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STUDIES ON STABILITY OF CYTOPLASMIC MALE STERILE LINES AND THEIR FLORAL TRAITS INFLUENCING OUTCROSSING IN RICE (ORY.ZA SATIVA L)

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One of the problems encountered in the hybrid breeding of crop plants is the
pollen shedding in male sterile lines under certain environments; hence, studies on
cytoplasmic male sterility (CMS) breakdown and relative stability of CMS lines for
their sterility was undertaken. Twelve CMS lines were evaluated over two seasons
at Delhi. The CMS lines PMS2A. PMS3A and PMS lOA were completely pollen
sterile, had zero spikelet fertility and hence highly stable while PMS SA and IR
S802SA were stable. Remaining CMS lines were unstable. 'I1\e CMS lines PMS 3A,
PMS lOA and IR S802SA had comparatively longer stigma, style and anthers length
favourable for outcrossing during seed production of Ax B and A x R combinations.
In general, all CMS lines were semi- Idwarfin height,. had medium to high tillering
and medium duration except IR 62829A (early). The differential response of CMS
lines possessing one kind of, cytosterile source 'wild abortiv~ twA)' observed was
due primarily to differences in nuclear background of CMS lines and interactions
of cytoplasm with nuclear genes.
 

Keywords: Cytoplasmic male sterility, breakdown, stability, hybrid vigour, Oryza sativa L

Info

Year: 1999
Volume: 59
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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