Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat 785 013.
1 Regional Agril. Research Station, Shillongani, Nagaon 782 001.
Genetic analysis of root and two shoot characters under rainfed upland situation indicated that maximum root length in two crosses (Nilajee/Annada and Hasakumral Annada), tillers per plant in Nilajee/Annada and root weight per plant in Hasakumra/Annada were under the control of additive gene action. Root thickness, root volume, roots per plant in both the crosses and plant height in Nilajee/Annada were under the control of nonadditive gene action. Both additive and nonadditive gene actions were involved in the expression of root branching, root-to-shoot ratio and proportion of thick roots per plant in both the crosses; for root weight per plant in Nijajee/Annada and for tillers per plant and plant height in Hasakumra/Annada.
Rice, root characters, shoot characters, genetic analysis
