Asian Journal of Bio Science

Shweta ¹, Arvind Srivastava ¹

Affiliations
1 Department of Genetics and Plant Breeding, C.S. Azad University of Agricultural and Technology, Kanpur, U.P., IN

Abstract

The genetic divergence among fifty-five genotypes of pigeonpea (Cajanus cajan) were evaluated for nine different characters and was estimated by Mahalanobis D² statistic. The genotypes were grouped into seven clusters. The clustering pattern of the genotypes showed high degree of genetic diversity. The highest intra cluster distance was noticed for the cluster IV (D² = 2.069) and the lowest for the cluster VII (D² = 1.619). The highest intra-cluster distance was observed between clusters VI and III (D²= 4.598) where as the lowest inter-cluster D² value was observed between cluster I and II (D² =2.308). The cluster mean estimated for nine characters revealed that cluster IV had highest mean values for days to 50 per cent flowering, days to maturity and plant height. For seed yield per plant, highest mean was recorded for cluster VII and lowest for cluster II with over all mean of 69.05. Therefore, the result of the present study suggest that while selecting parents, inter-cluster distance must be taken into consideration so as to initiate a crossing programme to produce new recombinants with desired characters in pigeonpea.

Keywords

Divergence, Pigeonpea, Cluster

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Shweta ¹, Ranjeet ¹, Om Prakash ¹

Affiliations
1 Regional Research Station, Saini, Kaushambi (U.P.), IN

Abstract

The experimental material comprising of one hundred (including three checks Varuna, Rohini and Maya) germplasm accessions of Indian mustard (Brassica juncea L.) were sown in augumented block design during Rabi 2008-09 at Regional Research Station, Saini, Kaushambi of C.S.A. University of Agriculture and Technology. In the present study, an attempt has been made to identify the genetically diverse germplasm and further utilization in the crop improvement to develop broad based cultivars. Result shows that variation in plant growth was prominently seen among the accessions as indicated by range of variability, mean performance and coefficient of variation.

Keywords

Indian Mustard, Accessions, Augumented Block Design.

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Ranjeet ¹, Shweta ¹

Affiliations
1 Dept. of Plant Breeding & Genetics, Oilseeds Section, C.S.A. University of Ag. and Tech., Kanpur (U.P.), IN

Abstract

Heterosis and inbreeding depression were studied in 45 hybrids developed through 10×10 diallel set of Indian mustard [Brassica juncea (L.) Czern & Coss.]. Heterobilities varied from-21.4 to 19.6 per cent and standard heterosis from - 23.6 to 29.6 per cent for seed yield. Significant desirable heterosis over best parent (Rohini) was observed for all the characters studied. Maximum significant standard heterosis was observed for main shoot length (56.6%) followed by secondary branches (35.8%), seed yield (29.6%), siliquae on main shoot (28.6%), seeds per siliqua (23.4%) and primary branches (22.4%) while heterobeltosis for main shoot length (68.7%), secondary branches (49.8%), siliquae on main shoot (41.6%), seeds per siliqua (39.1%), primary branches (33.4%) and seed yield (19.6%). The inbreeding depression for seed yield ranged from-35.2 to 12.8 per cent. The highest significant positive heterobeltosis and standard heterosis and high inbreeding depression was recorded in hybrids Rohini X Varuna followed by RK 9870×Vardan and Rohini×Vardan for seed yield. These crosses may be utilized for developing hybrids.

Keywords

Heterosis, Inbreeding Depression, GCA Effects, SCA Effects, Mustard.

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Shweta ¹, P. Singh ¹, Ranjeet ¹

Affiliations
1 Department of Genetics and Plant Breeding, C.S. Azad University of Ag. & Tech., Kanpur (U.P.), IN

Abstract

Experiment comprising 100 treatments (10 parents + 45 F₁s + 45 F₂s) generated from 10 parent diallel mating design was conducted in Indian mustard. Graphical representation reflected the over dominance with non- additive gene action for the characters number of siliquae on main raceme in both the generations, number of secondary branches per plant in F₁, number of primary branches per plant and oil content in F₂ generation whereas, rest of the characters reflected the partial dominance.

Keywords

Diallel, Graphical Analysis, Over Dominance, Partial Dominance.

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Shweta ¹, Ranjeet ¹, P. Singh ¹

Affiliations
1 Department of Plant Breeding & Genetics, Oilseeds section, C.S.A. Univ. of Ag. & Tech., Kanpur (U.P.), IN

Abstract

Ten diverse parent of Indian mustard were crossed in 10 x 10 diallel design excluding reciprocals Analysis. of the data on seed yield and its ten component characters suggested that dominant genes were more frequent than recessive ones for all the characters studied except days to flower in both the generations. Symmetrical proportions of positive and negative genes were observed for days to flower, plant height and seed yield per plant, while asymmetrical proportions of positive and negative genes were observed for the remaining characters. More than one major gene groups were involved in the inheritance of most of the characters. Predominance of non-additive gene action was observed for seed yield and its components characters. The exploitation of non-additive gene action through heterosis breeding or population improvement by intermating the improved genotypes in successive generations is suggested for improvement of seed yield and its component characters.

Keywords

Indian Mustard, Diallel Analysis, Gene Action.

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