Treatments with mono- and bifunctional ethylated (NEU, NDEU) and methylated (NMU,
NDMU) urea and ethyl methane sulphonate (EMS) in Manhar, an early maturing (120 days)
variety of indica rice reduced the germination, seedling survival, pollen fertility and
spikelet fertility percentage in Mt generation. NEU produced the highest frequency of
viable mutations in the M% generation, on the basis of segregating M% progenies as well as
mutants/lOO M% seedlings. Treatments with NEU (6 h) also produced the widest spectrum
and maximum relative frequency of viable mutations in M% generation. The relative
mutation frequency of monofunctional compounds NEU and NMU was larger than their
respective bifunctional compounds NDEU and NDMU. The most effective and efficient
mutagens were 0.010/. NMU and 0.050/. NDEU, respectively.
Keywords: Mutagen, mutations, effectiveness, efficiency, rice.
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
RA]ENDRA KUMAR AND S. C. MANI info_circle