Introgression Across Isolating Barriers in Wild and Cultivated Oryza Species

Chu, Yaw-En; Oka, Hiko-Ichi

doi:10.2307/2406809

Cited by 35 publications

(28 citation statements)

References 9 publications

(9 reference statements)

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“…Chu and Oka (1970) reported that the F 1 embryos and endosperm begin to deteriorate at about 6 DAP in interspecific hybridization between O. sativa and O. longistaminata. When O. longistaminata was used as maternal parent, hybrid embryos failed to develop after 3 DAP.…”

Section: Embryo Developmentmentioning

confidence: 99%

Abnormal Embryo Development and Efficient Embryo Rescue in Interspecific Hybrids, Oryza sativa * O. minuta and O. sativa * O. officinalis.

et al. 2002

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Interspecific hybrids between cultivated rice (Oryza sativa, 2n = 24, AA) and two wild species (O. minuta, 2n = 48, BBCC and O. officinalis, 2n = 24, CC) have been produced by cross pollination. The embryo development in these interspecific hybrids was observed to study the deterioration features in detail. All hybrids showed either abnormal embryo development with degenerating endosperm or embryo retardation itself. Abnormally developed embryos were observed by the end of 7 days after pollination and the percentage of abnormally developed embryos increased from 7 to 14 DAP. The embryos were excised at 7 to 14 DAP and cultured on MS medium supplemented with 1, 3 and 5 mg/l benzylaminopurine, 1 g/l casein hydrolysate, 0.8 % agar and 3 % sucrose. The optimal time for rescue turned out to be 11-14 DAP. There was a significant difference (P = 0.05) in the regeneration efficiency rate with rescue time but no significant difference with of culture medium in these cross combinations. The F 1 hybrids were morphologically intermediate between their parents. All F 1 hybrid plants thus obtained were completely sterile. Chromosome doubling was attempted by treating F 1 hybrid tillers with colchicine to overcome their sterility. The morphology of the colchicine-treated F 1 plants closely resembled the female parent and fertility.

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Section: Embryo Developmentmentioning

confidence: 99%

Abnormal Embryo Development and Efficient Embryo Rescue in Interspecific Hybrids, Oryza sativa * O. minuta and O. sativa * O. officinalis.

et al. 2002

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“…Gamete sterility, which is the commonest barrier encountered, is generally more pronounced for pollen than for ovules. Introgression of genes from one species to another is possible and occurs spontaneously C HU & O KA , 1970). Also, some weedy forms seem to have evolved from hybrid swarms between independently domesticated cultivars (SECOND, 1982).…”

Section: Introductionmentioning

confidence: 99%

Evolutionary relationships in the Sativa group of Oryza based on isozyme data

Second¹

1985

Genet. Sel. Evol.

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“…Moreover, if even a small fraction of the weedy plants survive and reproduce, weedy rice is so productive that it can spread and cause major economic damage (Ferrero 2003). There are some barriers to gene flow between domesticated Oryza sativa and its wild ancestor, Oryza rufipogon and other species of weedy rice, but gene flow can still occur (Chu & Oka 1970;Chen et al 2004). Thus, one factor that may make this weed particularly problematic is that improvements introduced into domesticated rice can also spread into its weedy relatives Fig.…”

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confidence: 99%