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Pak. J. Bot., 44(4): 1297-1301, 2012.

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SELECTION OF ELITE GENOTYPES FOR YIELD AND ASSOCIATED TRAITS IN F_2:3 FAMILIES OF INTERSPECIFIC CROSSES IN BRASSICA SPECIES

FAZLI DAYIM SHEHZAD AND FARHATULLAH^*

Abstract: Interspecific crosses of Brassica species were evaluated to identify desirable genotypes for yield and associated traits. Parent al species included Brassica napus (Dunkled, Maluko, line A-20-20), B. campestris (lines 1203 and 2163), B. carinata (Peela raya), and B. juncea (lines PR-64 and 89111-1). All traits were segregated in F₂ population. All parameters were decreased in F₃ in comparison to F₂ population, indicating higher response of the crosses to inbreeding depression (0-85%). A reduction in height (12-27%), primary branches (18-35%), pods main raceme^-1 (19-35%), seed pod^-1 (10-31%), pod length (14-28%), 100-seed weight (5-28%) and seed yield plant^-1 (14-35%) of F₃ population was recorded as compared to F₂. Heritability estimates were low to medium (50-70%) for primary branches, medium to high (70-80%) for plant height, pod length, seeds pod^-1, and seed yield plant^-1 while low-medium-high for pods raceme^-1 and 100-seed weight. It was concluded that selection for one of these characters would be beneficial for the others also. F₃ population of Maluko ´ 1203 produced the maximum silique main raceme^-1, seeds silique^-1, silique length and 100-seed weight. Peela raya ´ PR-64 produced the maximum primary branches plant^-1, while 2163 ´ 89111-1 was the best for seed yield plant^-1 and plant height in F₃ as compared to the F₂ population.

Department of Plant Breeding and Genetics, Khyber Pakhtunkhwa Agricultural University Peshawar, Pakistan

^*Corresponding author’s email: drfarhat@aup.edu.pk