Genetic basis of heterosis and inbreeding depression in rice (Oryza sativa L.)
- 1 April 2004
- journal article
- Published by Zhejiang University Press in Journal of Zhejiang University-SCIENCE A
- Vol. 5 (4), 406-411
- https://doi.org/10.1631/jzus.2004.0406
Abstract
The genetic basis of heterosis was studied through mid-parent, standard variety and better parent for 11 quantitative traits in 17 parental lines and their 10 selected hybrids in rice (Oryza sativa L.). The characters were plant height. days to flag leaf initiation, days to first panicle initiation, days to 100% flowering, panicle length, flag leaf length. days to maturity, number of fertile spikelet/panicle, number of effective tillers/hill, grain yield/10-hill, and 1000-grain weight. In general the hybrids performed significantly better than the respective parents. Significant heterosis was observed for most of the studied characters. Among the 10 hybrids, four hybrids viz., 17A×45R, 25A×37R, 27A×39R, 31A×47R, and 35A×47R showed highest heterosis in 10-hill grain yield/10-hill. Inbreeding depression of F2 progeny was also studied for 11 characters of 10 hybrids. Both positive and negative inbreeding depression were found in many crosses for the studied characters, but none was found significant. Selection of good parents was found to be the most important for developing high yielding hybrid rice varieties.Keywords
This publication has 11 references indexed in Scilit:
- Studies on Parental Variability and Heterosis in RicePakistan Journal of Biological Sciences, 2002
- Importance of epistasis as the genetic basis of heterosis in an elite rice hybridProceedings of the National Academy of Sciences of the United States of America, 1997
- Genetics of Hybrid Sterility and Hybrid Breakdown in an Intersubspecific Rice (Oryza sativa L.) PopulationGenetics, 1997
- Epistasis for Three Grain Yield Components in Rice (Oryxa sativa L.)Genetics, 1997
- A diallel analysis of heterosis in elite hybrid rice based on RFLPs and microsatellitesTheoretical and Applied Genetics, 1994
- Heterosis in Plant BreedingPublished by Wiley ,1994
- Heterosis and Hybrid Rice BreedingPublished by Springer Science and Business Media LLC ,1994
- Biometrical GeneticsPublished by Springer Science and Business Media LLC ,1982
- Hybrid Vigor in a Seven‐Parent Diallel Cross in Common Winter Wheat (Triticum aestivum L.)1Crop Science, 1968
- The Inviability, Weakness, and Sterility of Interspecific HybridsAdvances in Genetics, 1958