Indian Society of Genetics & Plant Breeding

Transformation of genetical ratios in crosses involving X-ray irradiated pollen grains in rice (Oryza sativa L.)

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Early reports on radiation dependant-genetical
transformation indicated that sublethal levels of irradiated
pollen grains allow development of normal hybrid progeny
but in sUbsequent generations they occasionally express
paternal characters due to differential inheritance of donor
genes. However, detailed genetic analysis has not yet
been followed up for confirmatory analysis of genetic
transformation especially in rice
(Oryza sativa L). Presently
different crosses of (normal and treated) Cherumodan
(green) x Japan Violet (purple) were effected by using
X-ray irradiated pollen grains of the male parent in the
treated crosses. The crosses were studied up to F3 of
the control and M3F3 of the treated generations for
inheritance/differential inheritance for fourteen
morphological characters. The results showed
transformation of genetical ratios in respect of ten
morphological characters in the M2F2 populations when
compared to the control. Observations recorded In the
FiM2F2 are duly confirmed by the results obtained from
the FiM3F3 generations. It could be concluded that
irradiation might have caused allelic differences as to
transform genetical ratios concerned as discussed.

Keywords: Rice, hybridization, irradiated pollen grains, transformation, genetical ratios


Year: 2007
Volume: 67
Issue: 1
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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