“…Though the root system of the plant body performs the vital functions of anchorage and nutrient absorption from the soil and has a wide range of genetic variability (NAGAI and TosHiKO, 1966;BAIRAGI, 1969;DERERAet al, 1969;HACKETTand BARTLETT, 1971;MACKEY, 1973;SADHU and BHADURI, 1983), yet the knowledge of the root system in cereals, particularly rice, is hmited in comparison to the shoot system. Since the development of male sterile lines in rice (PARMAR et al, 1979;CHAUDHARI et al, 1982;AZZINI and RUTGER, 1982;RAJ et al, 1984) considerable progress is being registered towards exploitation of hybrid vigour in shoot system, while paying scant attention to this aspect of the subterranean part of the plant body.…”