Genetic diversity in the parental lines and heterosis of the tropical rice hybrids |
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Authors: | Weijun Xu Sant S Virmani Jose E Hernandez Leocadio S Sebastian Edilberto D Redoña Zhikang Li |
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Institution: | 1. International Rice Research Institute, Manila, Philippines, DAPO Box 7777, Metro Manila, Philippines 2. CA, University of the Philippines at Los Ba?os, College, Laguna, Philippines 3. Philippine Rice Research Institute, Mu?oz, Nueva Ecija, 3119, Philippines
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Abstract: | Genetic diversity within and between the maintainer (B) and restorer (R) lines used in hybrid breeding programs of the Philippine
was investigated with information from analysis of pedigree record, quantitative traits and SSR assays. Mean coefficients
of coancestry were calculated as 0.11 within R lines, 0.27 within B lines, and 0.04 between R and B lines, indicating greater
diversity among R lines than among B lines, and the significant divergence between B and R lines. These results are consistent
with those obtained from quantitative trait analysis and SSR marker assays. Relative gene diversity for 37 random SSR markers
averaged 0.20 within B lines,0.28 within R lines, and 0.52 between two groups of lines. There were no consistent associations
among various genetic diversity measures. Random sets of SSR marker and pedigree based diversity measures had no significant
correlation with mid-parent heterosis for grain yield and biomass, indicating that prediction of heterosis for complex traits
based on these two genetic diversity estimates is difficult.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Coefficient of co-ancestry heterosis microsatellites quantitative traits |
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