Abstract
Regression coefficient ‘b1’ deviated from unity for length of main raceme, Number of secondary branches per plant, test weight, oil content, Number of siliquae per plant, seed yield per plant. The estimates of additive components (D ˆ ), dominance components ( 1 H ˆ and 2 H ˆ ) were highly significant for days to flowering, days to maturity, plant height, length of main raceme, number of siliquae per plant, number of secondary branches per plant, oil content, test weight and seed yield per plant .All the estimates of F ˆ(mean of Fr value, where Fr is the proportion of negatives effects of Genes in rth parents) was positive and significant number of siliquae per plant, days to flowering, days to maturity, plant height and except for which is highly significant whereas days to maturity was negative and significant. The estimates of 2 h ˆ were positive and highly significant for days to flowering, days to maturity, plant height, length of main raceme, oil content, test weight and seed yield per plant. The estimates of mean degree of dominance ( 1 H ˆ /D ˆ ) 0.5 were more than unity for length of main raceme, number of secondary branches per plant, oil content, test weight and seed yield per plant.
Indian mustard [Brassica juncea (L.) Czern and Coss] is the dominant species covering around 85 per cent of area under rapeseed mustard in India. The rest of the area is covered by three ecotypes of Brassica rapa variety brown sarson, yellow sarson and toria (Prakashschepra, 1996). Among the toria [Brassica rapa (L.) spp. Toria] nearly 1.4% area. Eruca sativa, Brassica rapa L. spp. brown sarson and other occupy nearly 6 percent of the total area. Regarding the origin of Indian mustard [Brassica juncea] there are two opinions put forwarded for its origin. According to Prakash and Hinata (1980), the species has originated in middle east where the putative parental species Brassica campestris and Brassica nigra might have first came into contact (Hemingway, 1976) argued that Brassica juncea has probably arisen by hybridization between different Bassica campestris and Brassica nigra genotypes at different times and localities resulting in secondary centers of origin in China, North- Western India and the Caucasus. Rapeseed mustard oil is used primarily for edible purposes and is the principal cooking oil in the mustard growing areas of the country. Besides, seeds are used as condiments and in preparations of salad, juices, curries and pickles. The meal cake left after oil extracting forms on important cattle feed and may also be used as organic manure. Inspite of fact that Indian mustard plays such as prominent role in agricultural economy, it has very low yields. There are several factors responsible for low yield at farmer's field. The important ones are delayed sowing, inadequate fertilizer application and various biotic and abiotic stresses.
Keywords
Additive, Dominance, Diallele, Indian Mustard
Refbacks
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