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GENETIC STUDIES ON YIELD AND YIELD COMPONENTS OF BRAS SICA CAMPESTRIS L.

O. I. JOARDER AND A. M. EUNUS

Abstract: Inheritance of yield and its associated characters were studied in two varietal crosses involving three varieties of Brassica campestris L. Heritahility estimates ranged from 81 per cent for seed yield per plant in cross-1 to 19 per cent for 10-fruit weight in cross-2. Transgressive segregation in both directions was observed in seed yield per plant and fruit length in cross-2 and in seed weight per 10 -fruit and number of fruits per plant in cross-1. Over­dominance was observed in 10-fruit weight and 100-seed weight in both the crosses and number of seeds per fruit and number of fruits per plant respectively in cross-1 and cross-2. The estimates of dominance (hj) gene effects were mostly larger than the additive (d) gene effects and were significant in almost all the characters. Epistasis was detected by chi-square test in all but in number of fruits per plant and fruit length in cross-2. Epistasis was found to be duplicate type in all cases except in number of fruits per plant and fruit length in cross-1 where it was complementary type. Absolute magnitude of the epistatic effects was more than the additive (d) and domi­nance (h) gene effects. Seed yield per plant was found to be correlated with other characters both phenotypically and genotypically. Phenotypic correla­tions appeared significant in all cases except that of number of fruits per plant with other associated characters.

Department of Botany, Rajshahi University, Rajshahi, East Pakistan.