AbstractThe nature and extent of hybrid vigour and inbreeding depression were estimated from a diallel set of rice varieties. The seven parents and their 21 F1s and 21 F2s were grown in pots with four replications. Data were collected on four root and two shoot characters.Maximum heterosis was recorded for root weight followed by roots/plant and root length. The inbreeding depression did not significantly affect the dry root weight in majority of the crosses. Heterosis for shoot weight was found to be associated with the heterosis for roots/plant and root weight.
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