|Vol. 18 >C. Research Notes I. Varietal differentiation and evolution|
|2.||Rhizomatous individual was obtained from interspecific BC2F1 progenies between Oryza sativa and Oryza longistaminata|
|D. TAO1, F. HU1, Y. YANG1,
P. XU1, J. LI1, G. WEN1, E. SACKS2,
K. MCNALLY2, P. SRIPICHITT3
1)Food Crops Research Institute, Yunnan Academy of Agricultural sciences, Kunming 650205, P. R. China
2)Plant Breeding, Genetics and Biochemistry Division, International Rice Research Institute, Philippines
3)Agronomy Department, Kasetsart University, Bangkok 10900, Thailand
To breed for perennial rice, especially upland rice (Schmit 1996, Tao
et al., 2000a), the most logical trait to select may be rhizomes,
which are typically found in wild relatives such as O. longistaminata,
O. rhizomatis, O. officinalis and O. australiensis.
The development of perennial rice, especially perennial hybrid rice, has
the potential to provide environmentally sound and economically viable
alternatives for use on land where annual type production is not sustainable
(Wagoner 1990). Perennial hybrid rice, like apomictic rice, would fix
heterosis, but perennial hybrid rice would be easier to achieve (Tao et
al., 2000a, Xiu 1995).
longistaminata (Makekawa et al. 1998, Yim et al. 1997). But the observation that there was only 1 rhizomatous individual out of 162 BC1F1 progenies and 8 rhizomatous individuals out of 577 BC2F1 progenies suggests that the inheritance of rhizomes was not simple. We consider two possible explanations. One is that rhizomatous gene(s) and embryo abortion gene(s) D1 are closely linkaged (Ghesquiere 1991), and the rhizomatous plant was a crossover product. Another explanation is that rhizomatous traits were controlled by several quantitative loci with dosage and/or epistatic effects. Thus, rhizomatous trait of F1 hybrids was intermediate between RD23 and O. longistaminata, and BC1F1 and BC2F1 progenies had few rhizomatous individuals. In order to test whether the embryo abortion gene(s) is linked to rhizomatous gene(s) or not, 220 young BC1 F1 embryos were cultured on 1/4 MS media 10-days after pollination, and 176 plantlets were obtained and transferred to an irrigated field. From this embryo rescued BC1F1 population, only one rhizomatous individual was observed, which indicated that there was no obvious linkage between embryo abortion genes and rhizome genes.
Financial support from National Natural Science Foundation of China, Yunnan Agricultural department, and Bundesministerium fur Wirtschaftliche Zusammenarbeit und Entwicklung (BMZ) is gratefully acknowledged.
Ghesquiere A., 1991. Reexamination of genetic control of the reproductive barrier between Oryza longistaminata and O. sativa, and relationship to rhizome expression. In: International Rice Research Institute (ed.), Rice genetics II. International Rice Research Institute. P. O. Box 933, Manila, Philippines. p.729-730.
Ghesquiere A. and M. Causse, 1992. Linkage study between molecular markers and genes controlling the reproductive barrier in interspecific backcross between O. sativa and O. longistaminata. RGN, 9: 28-31.
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Schmit V., 1996. Improving sustainability in the uplands through the development of a perennial upland rice. In: Piggin C., B. Courtois, and V. Schmit (eds.), Upland Rice Research in Partnership, Proceedings of the Upland Rice Consortium Workshop; 4-13 January 1996; Padang, Indonesia. p265-273.
Tao D., P. Sripichitt, 2000a. Preliminary report on transfer traits of vegetative propagation from wild rices to O. sativa via distant hybridization and embryo rescue. Kasetsart J., (Nat. Sci.) 34:1-11.
Tao D., F. Hu, Y. Yang, P. Xu, J. Li, E. Sacks, K. McNally, P. Sripichitt, 2000b. Rhizomatous individual was obtained from interspecific BC1F1 progenies between Oryza sativa and Oryza longistaminata. In: Abstracts, 4th International Rice Genetics Symposium, 22-27 October 2000, International Rice Research Institute, Los Banos, Laguna, Philippines. p. 64.
Vaughan D. A., 1994. The wild relatives of rice. International Rice Research Institute, Manila, Philippines. 137p.
Wagoner P., 1990. Perennial grain development: past efforts and potential for the future. Critical Rev. Plant Sci., 9(5): 381-408.
Xiu L. Q., 1995. Breeding for perennial hybrid rice. Division Seminars of Plant Breeding, Genetics, and Biochemistry. International Rice Research Institute, Manila, Philippines.
Yim K., D. E. Bayer, 1997. Rhizome expression in a selected cross in the Sorghum genus. Euphytica, 94: 253-256.
|Vol. 18>C. Research Notes I. Varietal differentiation and evolution|