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Paper ID: 30

Genetic Variability, Correlation and Path Coefficient among Agronomic Characters of Soybeans [Glycine max (L.) Merr.] Lines

Heru Kuswantoro1,2, Juli Santoso3 and Agus Suryanto4

1Indonesian Legume and Tuber Crops Research Institute, Jl. Raya Kendalpayak Km. 8, Malang 65162, East Java, Indonesia. Tel.: +62-341-801468, Fax.: +62-341-801496

2Research Organization for Agriculture and Food, National Research and Innovation Agency. Jl. Raya Surabaya – Malang Km. 65 Purwodadi, Pasuruan, Jawa Timur. Tel.: +62 8118612374

3Department of Agrotechnology,  Faculty of Agriculture, Universitas Pembangunan Nasional “Veteran” East Java, Jl. Raya Rungkut Madya Gunung Anyar Surabaya East Java, Indonesia. Tel.: +62-31-8706369, Fax : +62-31-8706372

4Department of Agrotechnology,  Faculty of Agriculture, Universitas of Merdeka Malang. Jl. Terusan Raya Dieng 62-64 Malang.. Tel.: +62-341-568395, Fax : ++62-341-568395

Email: herukusw@gmail.com

The genetic variability and the relationship among characters are very important in breeding activities. Selecting a desired genotype can be done appropriately when the genetic variability is high and relationship among characters is significant for indirect selection. Fifty soybean lines were grown in randomized complete block design with three replications. The variability of all characters was narrow, except number of branches and seed yield that had broad genetic variability. The heritability of the observed characters varied. The high heritability was shown by days to maturity, number of branches, and 100 seed weight. The medium heritability was shown by days to maturity, plant height, number of productive nodes, and seed weight per plant. The seed yield showed low heritability. The all genotypic correlations were insignificant, except seed weight per plant with seed yield. The phenotypic correlation among characters was found between seed yield with number of filled pods, 100 seeds weight and seed weight per plant, branches with productive node and filled pods, and productive nodes with filled pods. All genotypic path coefficients were insignificant. Phenotypic path coefficient revealed that days to flowering, number of branches per plant, 100 seed weight and seed weight per plant contributed directly to seed yield. Number of branches per plant had negative indirect effect through number of nodes and seed weight per plant, while seed weight per plant showed positive indirect effect through number of branches per plant. Therefore, the selection can be done directly on seed yield or indirectly using seed weight per plant.

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