Article Id: ARCC2766 | Page : 178 - 183
Citation :- HETEROSIS IN TWO LINE RICE HYBRIDS.Indian Journal Of Agricultural Research.2006.(40):178 - 183
N. Aananthi and S. Jebaraj*
Address : Department of Agricultural Botany, Agricultural College and Research Institute, Madurai - 625 104, India


The two line system of heterosis breeding (S x R) in rice is a new approach for further
increasing crop yields. An attempt was made to identify heterotic combinations among the 24
hybrids obtained by crossing four ‘S’ lines, viz., TS6, TS16, TS18 and TS29 with six non-
TGMS lines MDU5, IR20, CO43,CO45, ADT39 and Ponni. The three line hybrid CORH2 was
taken as the standard check to estimate standard heterosis. The spikelet fertility is an important
trait affecting the yield in hybrid rice breeding for which more than 50 percent of the hybrids
showed significant standard heterosis. The hybrid TS29 x Ponni recorded the maximum standard
heterosis (51.65 percent) followed by TS6 x Ponni (37.7 per cent) TS29 x CO45 (32.00 per
cent) and TS16 x CO43 ( 23.06 per cent) for single plant yield. These hybrids recorded >10%
heterosis over the three line hybrid CORH2 and hence they can be utilized in developing high
yielding two line rice hybrids



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