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Abstract

To study the genetic potential, heterotic effects and inbreeding depression, 8 × 8 F2 diallel populations with parental lines of upland cotton were grown during crop season 2010 in a randomized complete block design at Khyber Pakhtunkhwa Agricultural University Peshawar, Pakistan. Highly significant (p≤0.01) variations were noticed among parental lines and F2 populations for all the traits. According to genotypes mean performance for various traits, plant height varied from 101.60 to 126.30 cm and 98.60 to 140.60 cm, bolls plant-1 (12.87 to 19.53; 12.13 to 22.60), boll weight (3.80 to 5.01 g; 3.04 to 5.38 g) and seed cotton yield plant-1 varied from 55.74 to 85.47 g and 45.57 to 96.05 g in parental cultivars and their F2 populations, respectively. However

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