title: Genetic variability and selection criteria in rice mutant lines as revealed by quantitative traits.
abstract: Genetic based knowledge of different vegetative and yield traits play a major role in varietal improvement of rice. Genetic variation gives room for recombinants which are essential for the development of a new variety in any crop. Based on this background, this work was carried out to evaluate genetic diversity of derived mutant lines and establish relationships between their yield and yield components using multivariate analysis. To achieve this objective, two field trials were carried out on 45 mutant rice genotypes to evaluate their growth and yield traits. Data were taken on vegetative traits and yield and its components, while genotypic and phenotypic coefficients, variance components, expected genetic advance, and heritability were calculated. All the genotypes showed variations for vegetative traits and yield and its components. Also, there was positive relationship between the quantitative traits and the final yield with the exception of number of tillers. Finally, the evaluated genotypes were grouped into five major clusters based on the assessed traits with the aid of UPGMA dendrogram. So hybridization of group I with group V or group VI could be used to attain higher heterosis or vigour among the genotypes. Also, this evaluation could be useful in developing reliable selection indices for important agronomic traits in rice.
authors.affiliation: Institute of Tropical Agriculture, Universiti Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia.
authors.forename: Yusuff
authors.initials: Y
authors.lastname: Oladosu
authors.affiliation: Institute of Tropical Agriculture, Universiti Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia ; Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia.
authors.forename: M Y
authors.initials: MY
authors.lastname: Rafii
authors.affiliation: Institute of Tropical Agriculture, Universiti Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia ; Department of Biochemistry, Faculty of Biotechnology and Biomolecular Science, Universiti Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia.
authors.forename: Norhani
authors.initials: N
authors.lastname: Abdullah
authors.affiliation: Institute of Tropical Agriculture, Universiti Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia ; Bangladesh Institute of Nuclear Agriculture, Mymensingh 2202, Bangladesh.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Abdul Malek
authors.affiliation: Bioscience and Agrotechnology Division, Malaysian Nuclear Agency, Bangi, 43000 Selangor, Malaysia.
authors.forename: H A
authors.initials: HA
authors.lastname: Rahim
authors.affiliation: Strategic Livestock Research Centre, Malaysian Agricultural Research and Development Institute (MARDI), Serdang, 43400 Selangor, Malaysia.
authors.forename: Ghazali
authors.initials: G
authors.lastname: Hussin
authors.affiliation: Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia ; Bangladesh Rice Research Institute (BRRI), Gazipur, Bangladesh.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Abdul Latif
authors.affiliation: Institute of Tropical Agriculture, Universiti Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia.
authors.forename: Isiaka
authors.initials: I
authors.lastname: Kareem
mesh_terms: D014644:Genetic Variation / Q000235:genetics*; D009154:Mutation / Q000235:genetics*; D012275:Oryza / Q000235:genetics*; D019655:Quantitative Trait, Heritable; D012641:Selection, Genetic / Q000235:genetics*