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Alien genes introgression and development of monosomic alien addition lines from Oryza latifolia Desv. to rice, Oryza sativa L.

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Oryza latifolia, a tetraploid wild relative of cultivated rice is an important source of resistance to bacterial blight (BB), the brown planthopper (BPH) and the whitebacked planthopper (WBPH). Interspecific hybrids were obtained between an elite breeding line (IR31917-45-3-2) of Oryza sativa (2n = 24 AA) and O. latifolia Acc. No. 100914 (2n = 48 CCDD). The crossability in F1 was 7.58% and it ranged from 0.11 to 0.62 in backcross generations. The F1 hybrid showed 2–6 II, 0–2 III, 0–1 IV and 22–32 I; the mean being 3.92 II + 0.11 III + 0.02 IV + 27.30 I per cell at diakinesis. Monosomic alien addition lines (MAALs) having a 2n chromosome complement of O. sativa and one chromosome of O. latifolia were characterized based on morphology and isozyme banding pattern. The MAALs were designated as MAAL-1, MAAL-2, MAAL-4, MAAL-5, MAAL-6, MAAL-7, MAAL-8, MAAL-9, MAAL-10, MAAL-11 and MAAL-12. The female transmission rates of the alien chromosome varied from 4.4 to 35.5%, whereas 8 of the 11 MAALs transmitted the alien chromosome through the male gamete, the range being 1.7% (MAAL 10) to 11.9% (MAAL 12). Disomic progenies in BC3 and BC4 generations had complete resemblance to the O. sativa parent. Of the 2,295 disomic BC3F3 progenies, 309 showed introgression for resistance to BPH and 188 each for WBPH and BB resistance. Four plant progenies which were resistant to both BPH and WBPH were also resistant to BB race 2 of the Philippines. Nine of the 34 BC3F1 plants showed introgression for ten allozymes of O. latifolia, such as Est5, Amp1, Pgi1, Mdh3, Pgi2, Amp3, Pgd2, Est9, Amp2 and Sdh1, located on 8 of the 12 chromosomes. Alien introgression was also detected for morphological traits such as long awns, earliness, black hull, purple stigma and apiculus. Abnormal plants with many wild-species traits suddenly appeared in normal disomic progenies. These plants showing instability and abnormal segregation behaviour are being investigated for the activation of transposons.

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The financial support from the Rockefeller Foundation is gratefully acknowledged.

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Correspondence to D. S. Brar.

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Communicated by G. Wenzel

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Multani, D.S., Khush, G.S., delos Reyes, B.G. et al. Alien genes introgression and development of monosomic alien addition lines from Oryza latifolia Desv. to rice, Oryza sativa L.. Theor Appl Genet 107, 395–405 (2003).

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