Abstract
A set of 25 test genotypes including 11 promising high zinc landraces, four zinc biofortified released varieties, six Zn-dense advance breeding lines, one OUAT rice variety, one zinc dense check variety “Chittimatyalu” and three low zinc mega varieties of rice (Swarna and Sambamahsuri) were assessed for grain Zn content and inter-relationship among seed yield and quality traits. P44 selection revealed highest Zn content (52.7ppm) followed by Basudha, Manika, Nikipankhia, ORCZ 75-3-1 and Tikimashuri with Zn content more than 40 ppm. Grain yield showed a significant positive correlation with a number of ear-bearing tillers m-2 and grain number panicle-1. Plant height exhibited a negative correlation with a number of effective bearing tillers m-2 and seed yield, but positively correlated with zinc content which seems to be the major hindrance for breeding semi-dwarf high yielding Zn-dense. The tall indica landraces such as Malliphulajhulli (43.8 ppm), Nikipankhia (42.8 ppm), Padmavati (31.3 ppm), Tikimahsuri (41.5 ppm), and Basudha (44.4 ppm) harbor high grain zinc content but revealed low yield potential. Transfer of zinc transporter genes available in the above tall indica types to semi-dwarf plant types may enrich the status of zinc content in grain.
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