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The use of cytoplasmic genetic male sterility system in developing hybrids in crops
is possible only when effective restorers are identified. The CMS lines introduced
from China are unstable to use as such in developing hybrid rice in India. Therefore, it
is imperative to identify maintainers and restorers among the lines developed
through conventional breeding procedures. Pollen (or) spikelet fertility or both were used
as an index to fix the restoration ability of the lines (Sutaryo, 1989). The present
study was undertaken to find out the fertility restoration ability of 31 testers on eight
CMS lines.
Materials and Methods
Eight cytoplasmic male sterile lines, viz., IR 80559 A (L1), APMS 2 A(L2), IR 72081 A(L3),
IR 75601 A(L4), IR 75596 A(L5), IR 80154 A(L6), CRMS 32 A(L7), IR 75608 A (L8), and
31 testers, viz., IR 62124-83-3-2-1(T1), IR 62036-222-3-3-1-2(T2), IR 62037-93-1-3-1-1(T3),
IR 63881-49-2-1-3-2(T4), IR 72865-94-3-3-2(T5), IR 62030-83-1-3-2(T6), IR
59673-93-2-3-3(T7), IR 68427-8-3-3-2(T8), IR 68926-61-2(T9), MDU 5(T10), ACK 99017(T11),
AD 01259(T12), AD 01260(T13), TP 1021(T14), RR 363-1(T15), RR 361-3(T16), RR
354-1(T17), RR 347-1(T18), RR 348-6(T19), RR 286-1(T20), RR 166-645(T21), RR433-1(T22),
RR 434-3(T23), ASD 06-1(T24), ASD 06-2(T25), ASD 06-3(T26), ASD 06-4(T27), ASD
06-5(T28), ASD 06-6(T29), ASD 06-7(T30) and ASD 06-8(T31), were raised in the
LXT (8X31) mating design to get 248 hybrids during September 2007. Three
staggered sowings were taken to synchronize the flowering. |
