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Asian Journal of Plant Sciences

Year: 2004 | Volume: 3 | Issue: 2 | Page No.: 207-210
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Authors

Muhammad Sayyar Khan

Iftikhar Hussain Khalil

Muhammad Siraj Swati

Keywords

To study the effects of heterosis on important agronomic and yield contributing traits, this experiment was conducted at Agricultural Research Institute, Tarnab, Peshawar during August 2001, using Randomized complete block design with three replications. The planted material consisted of ten sunflower inbred lines (Parents) and their nine crosses. Highly significant genetic differences were observed among the inbred liens for head weight per plant, seed weight per head, 1000-seed weight and harvest index, however, the differences among the inbred lines for the weight of filled seeds per head were statistically non significant. Genetic differences among the hybrids were significant for all characters except for head weight per plant. High levels of heterosis were observed for the hybrids TS-17xTR-120 and TS-18xTR-120 for important agronomic characters such as head weight per plant (184 and 183%, respectively), seed weight per head (322.3 and 292.7%, respectively) and weight of filled seeds per head (302.7 and 295.5%, respectively). TS-4xTR-11 showed maximum heterosis for 1000-seed weight (104.6%) and harvest index (128.6%). Mean data for 1000-seed weight, weight of filled seeds per head and seed weight per head were higher for TS-17xTR-120, TS-18xTR-120 and TS-4xTR-11 than all other hybrids. Based on the mean performance and high heterotic effects for important characters, these hybrids and their parents are suggested for further study and use in sunflower breeding programs.
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