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TRAIT ASSOCIATION AND CONSTRUCTION OF SELECTION INDICES IN RICE (Oryza sativa L.) UNDER AEROBIC CONDITION
CHANDRASHEKHAR HARADARI, SHAILAJA HITTALMANI

Published in: International Journal of Agriculture Sciences
Volume- 9, Issue-30, pp.4416-4421, Jun 2017
DPI :-> 16.10077.IJAS.2017.V9I30.44164421.1748



Abstract
Present investigation including 46 F3 families of rice were evaluated under aerobic condition during 2013, with an objective of tracing the relationship between yield component characters followed by construction of selection indices. Among yield component characters viz., productive tillers per plant (X1), single panicle weight (X2), spikelet fertility (X3), biomass (X4) and harvest index (X5) exhibited highly significant positive correlation coefficients with high direct effects on grain yield per plant (X6) indicating selection based on these characters could be very effective for yield and the same were considered to construct selection indices. Sixty three selection indices involving grain yield per plant and five yield component characters were constructed using discriminant function analysis and selection efficiency of the function was improved by increasing number of characters in the index. Among single character index, spikelet fertility exhibited higher genetic gain (49.41) and relative efficiency (1138.48%) over straight selection for grain yield. Whereas selection indices with six, five and four character combinations recorded highest genetic advance (79.56, 73.99 and 71.63 resp.) as well as relative efficiency (1833.09%, 1704.91% and 1650.65% resp.). F3 families viz., 23-5-108, 23-5-315 and 23-5-277 were found superior based on index score estimates. Practically, index with minimum characters could be advantageously exploited and advocated for selecting high yielders in rice.

Key-Words / Index Term
Selection index, Correlation, Relative efficiency, Grain yield, Aerobic rice

How to cite this article
CHANDRASHEKHAR HARADARI, SHAILAJA HITTALMANI , “TRAIT ASSOCIATION AND CONSTRUCTION OF SELECTION INDICES IN RICE (Oryza sativa L.) UNDER AEROBIC CONDITION”, International Journal of Agriculture Sciences, 9, Issue-30, pp.4416-4421, Jun 2017. DPI:16.10077.IJAS.V9.I30.1748