Table 1. Relationships among various systems of numbering linkage groups,
chromosomes and trisomics.
=============================================================================== Linkage Groups Chromosomes Trisomics =================== ========================== ==================== Kinoshita Misro* Nishimura Shastry Kurata Khush Iwata and et al. et al. et al. Omura 4 6 7 8 5 2,3 1 =============================================================================== I I 6 3 K6 triplo-3 ..B II II 11 12 K4 triplo-12 ..E III III 3 1 K1 triplo-1 O IV IV 10 7 K11 triplo-7 F VI+IX VI,XII 2 5 K9 triplo-5 L V IX 1 9 K10 triplo-9 H VII 1 9 K10 triplo-9 H VIII VIII 9 11 K8 triplo-11 G(I.J.&K) X 8 2 K2 triplo-2 N XI XI 5 4 K3 triplo-4 M XII 5 4 K3 triplo-4 M fgl 7 10 K12 triplo-10 C d-33 4 6 K5 triplo-6 A su 14 8 K7 triplo-8 D ===============================================================================*Groups VI, VII, and X were not correlated with Kinoshita's groups.
References:
1. Iwata, N. and T. Omura 1984. Studies on the trisomics in rice plant (Oryza sativa L.). 6. An accomplishment of a trisomic series in japonica rice plants. Jpn. J. Genet. 59:199-204.
2. Khush, G.S., R.J. Singh, S.C. Sur and A.L. Librojo 1984. Primary trisomics of rice: origin, morphology, cytology, and use in linkage mapping. Genetics. 107(1):141-163.
3. Khush, G.S. and R.J. Singh 1985. Relationships between linkage groups and cytologically identifiable chromosomes of rice. Proceed. International Rice Genetics Symposium. (in print).
4. Kinoshita, T. 1984. Gene analysis and linkage map. p. 187-274. In S. Tsunoda and N. Takahashi, eds. Biology of Rice. Japan Scientific Societies Press, Tokyo.
5. Kurata, N., N. Iwata, and T. Omura 1981. Karyotype analysis in rice. 2. Identification of extra chromosomes in trisomic plants and banding structure on some chromosomes. Jpn. J. Genet. 56(1):41-50.
6. Misro, B. 1981. Linkage studies in rice (Oryza sativa L.). 10.Identification of linkage groups in indica rice. Oryza, Cuttack 18(4):185-195
7. Nishimura, Y. 1961. Studies on the reciprocal translocations in rice and barley (in Japanese with English summary). Bull. Natl. Inst. Agr. Sci. Ser. D9:171-235.
8. Shastry,S.V.S., D.R.R. Rao and R.N. Misra 1960. Pachytene analysis in Oryza. I. Chromosome morphology in Oryza sativa. Indian J. Genet. Plant Breed.20:15- 21.
Report of Interim Committee on Chromosome Numbering to the International Rice
Genetics Symposium, May 29, 1985
In order to clarify understanding in rice genetics, a unified system of numbering rice chromosomes needs to be adopted. The chromosomes shall be assigned Arabic numbers in order according to their pachytene length (or centromere position in case of ambiguity of length) based on studies by Dr. S.V.S. Shastry et al. (1960) and confirmed by Dr. N. Kurata et al. (1981). The somatic chromosomes shall be numbered accordingly. Complete primary trisomic series have been established and the extra chromosomes identified in three laboratories but differences exist in identification of extra chromosomes of a few trisomics. These differences should be resolved as soon as possible. In this fashion all linkage groups will be identified with their respective chromosomes. Committee members: C.M. Rick, Chairman, G.S. Khush, N. Kurata, H.I. Oka, R. Seetharaman, N. Iwata, T. Kinoshita, R.N. Misra, R. Riley, H.K. Wu.