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Journal of Agronomy
Year: 2006  |  Volume: 5  |  Issue: 3  |  Page No.: 505 - 508

Study on Heterosis in Agronomic Characters of Rapeseed (Brassica napus L.) Using Diallel

Abdul Wahab Nassimi, Raziuddin, Sardar Ali and Naushad Ali    

Abstract: To estimate mid-parent and better-parent heterosis in Brassica napus L. an experiment was conducted at NWFP Agricultural University, Peshawar, during 2004-05 and 2005-06 using 8x8 full diallel crosses. All the 56 F1 hybrids and their parents were planted in a randomized complete block design with three replications. Out of 56 hybrids, negative mid-parent and better-parent heterosis were estimated in 28 and 25 hybrids for 50% emergence, in 30 and 17 hybrids for 50% flowering, in 34 and 49 hybrids for physiological maturity and in 27 and 38 hybrids for plant height, respectively whereas positive heterosis were estimated in 28 and 23 crosses for primary/branches plant. However, significant negative mid-parent and better-parent heterosis were recorded in 6 and 7 hybrids for 50% emergence, in 17 and 04 for 50% flowering, in 11 and 20 for physiological maturity, in 27 and 36 for plant height while significantly positive heterosis was recorded in 27 and 23 crosses for primary branches/plant, respectively. Better-parent heterosis reduced to 25% for emergence, 2.78% for flowering, 4.08% for maturity and 21.22% for plant height whereas it reached to 50% for branches/plant. Among parents, NUR1, NUR2, NUR4, NUR5 and NUR9 were found superior when used in different cross combinations. Hybrids NUR3xNUR4, NUR5xNUR1 and NUR5xNUR7 could be used to develop early maturing while NUR3xNUR2 and NUR5xNUR8 would be helpful to develop medium sized with robust structured brassica lines that could be tolerant to lodging with greater yields.

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