Abstract
The plant breeder has certain desired plant characteristics in his mind while selecting for particular genotypes and for this he/she applies various weight to different traits for arriving at decisions. This suggests the use of a selection index that gives proper weight to each of the two or more characters to be considered. Among forty genotypes of durum wheat thirty-one selection indices, involving grain yield per plant and four yield contributing components, were constructed using the discriminant function technique. The superiority of selection based on index increases with an increase in the number of characters under selection. The selection index constructed based on five characters viz., grain yield per plant, days to maturity, plant height, biological yield per plant and harvest index exhibited maximum relative efficiency and selection efficiency. The plant breeder might be interested in maximum genetic gain with minimum number of characters. The maximum relative efficiency per character was observed in selection index comprised of days to maturity and plant height (X3 + X4) followed by plant height and biological yield per plant (X3 + X4 ).
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