Multivariate Analysis of Genetic Variation in Rapeseed ( Brassica Napus L. )

Designing breeding programs for rapeseed (Brassica napus L.) cultivars with developed seed and oil yields needs information about the genetic variability of characters. In this study, 40 rapeseed genotypes were evaluated for genetic variation and relationships between 12 agro-morphological characters. Brassica species represent a broad range of crops. This redirects the high degree of genetic diversity and allied phenotypic plasticity. Significant differences among the clusters were observed. The first two components with Eigen value were greater than unity contributed a total of 42.77% variation to the divergence. The genotypes were grouped into five clusters. Cluster V contained the maximum number of genotypes (11) and cluster III contained the lowest (4). The highest inter-cluster distance was found between cluster II and cluster V and the lowest between cluster II and cluster IV. The highest intra-cluster distance was noticed for cluster I and the lowest for cluster V. Considering diversity pattern and other agronomic performance lines Nap0837, Nap-0733-1, Nap-2066, Nap-9901, Nap-108 and BARI-8 could be considered apposite parents. This information is suitable for hybrid breeding and encouraging breeders to exchange their germplasm as to enlarge the genetic diversity of breeding accessions

Genetic Divergence in Advanced Lines of Oilseed Rape (Brassica napus ssp oleifera L.)

A field experiment was conducted with 22 Brassica napus L. advanced lines at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka from November 2008 to March 2009 to asses genetic diversity among advanced lines of Brassica napus L. Different multivariate analysis techniques were used to classify 22 Brassica napus genotypes. The genotypes were grouped into four clusters. The highest inter-cluster distance was observed between clusters II and IV whereas the maximum intra-cluster distance was found in cluster II. Therefore, the genotypes belonging to cluster I and cluster II, cluster II and cluster III and cluster III and cluster IV have been selected for future hybridization program. The role of number of secondary branches per plant and number of siliqua per plant in both vectors were important components for genetic divergence in these materials. Considering group distance and other agronomic performance the inter-genotypic crosses between G1 and G2, G2 and G6; G6 and G7; G6 and G8 and G7 and G8 might be suggested for future hybridization program

Genetic Divergence in Advanced Lines of Oilseed Rape (Brassica napus ssp oleifera L.)

A fi eld experiment was conducted with 22 Brassica napus L. advanced lines at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka from November 2008 to March 2009 to asses genetic diversity among advanced lines of Brassica napus L.. Diff erent multivariate analysis techniques were used to classify 22 Brassica napus genotypes. Th e genotypes were grouped into four clusters. Th e highest inter-cluster distance was observed between clusters II and IV whereas the maximum intra-cluster distance was found in cluster II. Th erefore, the genotypes belonging to cluster I and cluster II, cluster II and cluster III and cluster III and cluster IV have been selected for future hybridization program. Th e role of number of secondary branches per plant and number of siliqua per plant in both vectors were important components for genetic divergence in these materials. Considering group distance and other agronomic performance the inter-genotypic crosses between G1 and G2, G2 and G6; G6 and G7; G6 and G8 and G7 and G8 might be suggested for future hybridization program

Estimation of Heterosis for Yield and Its Attributes in Brassica rapa L.

Six parents of Brassica rapa (L) viz. SAU Sarisha-1, SAU Sarisha-2, SAU Sarisha-3, BARI Sarisha-6, BARI Sarisha-15, and Tori-7 were crossed in a half diallel fashion. The resultant fifteen hybrids along with six parents were evaluated in randomized complete block design with three replications with the aim of evaluating the performance of hybrids over their parents. The study was conducted at the Research field of Sher-e-Bangla Agricultural University, Bangladesh during Rabi 2010-2011. Results indicated that, all the parameters except 1000-seed weight and seed yield/plant were significantly differed among the parents indicated existing variation in the parents. The best performance was observed from the parents BARI Sarisha-15 and Tori-7. The growth as well as yield and yield attributes of all hybrids were also significantly differed. The highest seed yield was obtained from the hybrid CC6 (11.55 g/plant) followed by CC15 (9.75 g/plant) with a moderate days to flowering. The most heterotic hybrids for seed yield per plant were CC14, which produced significantly positive heterosis over mid-parent (35.99%) and better-parent (17.09%) in our study. However, the parent BARI Sarisha-6, BARI Sarisha-15, and Tori-7 can be used in any breeding program and the hybrids CC14 can be selected for further study towards a variety development

Estimation of Heterosis for Yield and Its Attributes in Brassica rapa L.

Six parents of Brassica rapa (L) viz. SAU Sarisha-1, SAU Sarisha-2, SAU Sarisha-3, BARI Sarisha-6, BARI Sarisha-15, and Tori-7 were crossed in a half diallel fashion. The resultant fifteen hybrids along with six parents were evaluated in randomized complete block design with three replications with the aim of evaluating the performance of hybrids over their parents. The study was conducted at the Research field of Sher-e-Bangla Agricultural University, Bangladesh during Rabi 2010-2011. Results indicated that, all the parameters except 1000-seed weight and seed yield/plant were significantly differed among the parents indicated existing variation in the parents. The best performance was observed from the parents BARI Sarisha-15 and Tori-7. The growth as well as yield and yield attributes of all hybrids were also significantly differed. The highest seed yield was obtained from the hybrid CC6 (11.55 g/plant) followed by CC15 (9.75 g/plant) with a moderate days to flowering. The most heterotic hybrids for seed yield per plant were CC14, which produced significantly positive heterosis over mid-parent (35.99%) and better-parent (17.09%) in our study. However, the parent BARI Sarisha-6, BARI Sarisha-15, and Tori-7 can be used in any breeding program and the hybrids CC14 can be selected for further study towards a variety development