Plant 2016; 4(6): 51-55 http://www.sciencepublishinggroup.com/j/plant doi: 10.11648/j.plant.20160406.12 ISSN: 2331-0669 (Print); ISSN: 2331-0677 (Online) Path Coefficient Analysis and Correlation Coefficients Effects of Different Characters on Yield of Brassica rapa L. Shahidul Islam 1 , Md. Maksudul Haque 2, * , Shahidur Rashid Bhuiyan 1 , Sarowar Hossain 1 1 Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh 2 Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh Email address: maksudulhq@gmail.com (Md. M. Haque) * Corresponding author To cite this article: Shahidul Islam, Md. Maksudul Haque, Shahidur Rashid Bhuiyan, Sarowar Hossain. Path Coefficient Analysis and Correlation Coefficients Effects of Different Characters on Yield of Brassica rapa L. Plant. Vol. 4, No. 6, 2016, pp. 51-55.doi: 10.11648/j.plant.20160406.12 Received: September 18, 2016; Accepted: September 26, 2016; Published: October 27, 2016 Abstract: A study was conducted by using twenty one (21) F 9 populations derived from inter-varietal crosses of Brassica rapa L. Path co-efficient analysis revealed that plant height, number of primary branches per plant, number of siliqua per plant, seeds per siliqua, and siliqua length had the positive direct effect on yield per plant and days to 50% flowering, number of secondary branches per plant, and thousand seed weight had the negative direct effect on yield per plant. Correlation studyrevealed that yield per plant had significant positive association with plant height, number of primary branches per plant, number of siliqua per plant, seeds per siliqua, and siliqua length (genotypic or phenotypic level). Based on the variability study, some F 9 plants showed high heritability for short duration and yield contributing characters were selected from some of the crosses combinations of the intervarital crosses of Brassica rapafor further selection. Keywords: Path Coefficient, Correlation Coefficients, Siliqua, Brassica rapa L. 1. Introduction Brassica oil is the world's third most important sources of edible vegetable oils [1]. Oleiferous Brassicaspecies can be classified into three groups viz; the cole, the rapeseed and the mustard. The mustard groups include species like Brassicajuncea Czern and Coss, Brassicanigra Koch and Brassicacarinata Braun; while the rapeseed groups includes BrassicarapaL. and Brassicanapus L. [2]. The genomic constitutions of the three diploid elemental species of Brassica are AA for Brassicarapa, BB for Brassicanigraand CC for Brassicaoleracea having diploid chromosome number of 20, 16 and, 18 respectively. On the Other hand, the species Brassicajuncea (AABB), Brassicacarinata (BBCC) and Brassicanapus (AACC) are the amphidiploids. The coles are consumed as vegetables and the other two are the valuable sources of edible oils and proteins. The mustard oil is not used only for edible cooking purpose but also is used in hair dressing, body massing and in different types of pickles preparation. It has also several medicinal values. Oil cake is the most important feed for livestock and is also used as organic manure. The important regions growing these crops include Canada, China, Northern Europe and the Indian subcontinent. In Bangladesh, local cultivars/varieties like B. juncea and B. napusare highyielding but not short durated. That’s why B.rapa are widely grown and it gives moderate yield but early cultivars produce high yield and it is drought and stress resistant. In Bangladesh, Brassica is the most important oilseed crop. The country is facing huge shortage in edible oils. Almost one fourth of the total edible oil consumed annually is imported. The import cost was about 690 million US dollar in 2003 [3]. On Recommended Dietary Allowance (RAD) basis, Bangladesh requires 0.29 million tons of oils which is equivalent to 0.8 million tons of oilseeds; but it produces only about 0.254 million tons, which covers only 45% of the domestic need [4]. This crop covers the highest acreage which is 78% of the total oilseed acreage of Bangladesh [3].The average yield of Brassica oilseed in Bangladesh is around 963 kg/hectare [4]. In Bangladesh there is limited scope to increase acreage due to pressure of other crops and to increase yield due to