Summary
A representative group of 100 elite lines, 67 of which are restorers and 33 maintainers, from 68 crosses made at IRRI and 18 improved varieties from five countries were studied, using Mahalonobis, D2-statistic and canonical analysis, to understand the nature and magnitude of divergence and to assess the importance of a set of quantitative characters related to yield in genetic differentiation. The 100 genotypes were grouped into 13 clusters. There were three single variety clusters and the number of lines in the remaining clusters ranged from 2–36. Canonical vector values indicated the importance of yield followed by 1,000-grain weight, days to maturity and plant height in primary as well as in secondary differentiation. Results showed that yield, number of tillers per plant, days to maturity and 1,000-grain weight contributed largely to the divergence. There were no indications of a relationship between geographical diversity and genetic diversity in the present study. Disposition of IRRI developed maintainers and restorers into various clusters indicated the presence of large amounts of diversity within the IRRI elite lines which suggested that these materials could be used in crossing programs to produce heterotic F1 hybrids. Crossing of maintainers and restorers among the highly diverse groups was suggested as it may produce F1S that will give higher magnitudes of heterosis.
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References
Anand IJ, Murty BR (1968) Genetic divergence and hybrid performance in linseed. Indian J Genet Plant Breed 28:178–185
International Rice Research Institute (IRRI) (1980) Annu Rep 1979. Los Baños, Philippines, pp 157
Jinfei Xu, Wang Luin (1983) The utility of multivariate analysis on predicting heterosis in rice. In: Proc Int Genet Congr, New Delhi, pp 551
Joshi AB, Dhawan NL (1966) Genetic improvement of yield with special reference to self-fertilizing crops. Indian J Genet Plant Breed 26A: 101–113
Kwangsi Rice Heterosis Utilization Team (1977) Understanding the basic theory of ‘3-line’ breeding of rice (original in Chinese). Zhonggue Nongye Kexue (Chinese Agricultural Sciences) 1:32–34
Lin SC, Yuan LP (1980) Hybrid rice breeding in China. In: Innovative approaches to rice breeding. Int Rice Res Inst, Los Baños, Laguna, Philippines, pp 35–51
Maurya DM, Singh DP (1977) Genetic divergence in rice. Indian J Genet Plant Breed 37:394–402
Ram J, Panwar DVS (1970) Interspecific divergence in rice. Indian J Genet Plant Breed 30:1–10
Rao AV, Prasad ASR, Sai Krishna T, Seshu DV, Srinivasan TE (1981) Genetic divergence among some brown planthopper resistant rice varieties. Indian J Genet Plant Breed 41: 179–185
Rao CR (1952) Advanced statistical methods in biometric research, 1st edn. Wiley and Sons, New York
Singh RK, Chaudhary BD (1977) Biometrical methods in quantitative genetic analysis. Kalyani Publ, New Delhi
Vairavan S, Siddiq EA, Arunachalam V, Swaminathan MS (1973) A study on the nature of genetic divergence in rice from Assam and Northeast Himalayas. Theor Appl Genet 43:213–221
Virmani SS, Chaudhary RC, Khush GS (1981) Current outlook on hybrid rice. Oryza 18:67–84
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Communicated by G. S. Khush
Part of M.S. Thesis of the senior author
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Julfiquar, A.W., Virmani, S.S. & Carpena, A.L. Genetic divergence among some maintainer and restorer lines in relation to hybrid breeding in rice (Oryza sativa L.). Theoret. Appl. Genetics 70, 671–678 (1985). https://doi.org/10.1007/BF00252295
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DOI: https://doi.org/10.1007/BF00252295