Reproductive Barriers Distributed in Cultivated Rice Species and Their Wild Relatives

Chu, Yaw-En; Morishima, Hajime; Oka, Hiko-Ichi

doi:10.1266/jjg.44.207

Cited by 93 publications

(78 citation statements)

References 34 publications

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“…However, between O. glaberrima and O. barthii, hybridizations are frequent (Chu & Oka, 1970) and would be at the origin of the certain forms of O. barthii fertile adventitious (Second, 1982). The barriers of reproduction generally result from sterility gametic and more particularly pollinic, by the low vigor of F 1 or the degeneration of the embryo (Chu et al, 1969). The natural hybridizations are possible in the contact areas of the different species.…”

Section: Natural Hybridizations Between O Glaberrima and Its Wild Formsmentioning

confidence: 99%

The African Rice Oryza glaberrima Steud: Knowledge Distribution and Prospects

Agnoun¹,

Biaou²,

Sié³

et al. 2012

IJB

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This paper presents a consolidated balance-sheet on the botanical and historical evidence for the role of the cultivated African rice species (Oryza glaberrima Steud) in West and Central Africa as well as its geographical distribution. Because Oryza glaberrima has survived without the help and interference from human, it has developed adaptive and protective mechanisms for resisting major biotic and abiotic stresses. Oryza glaberrima is also very plastic with two major ecotypes: the floating and the non floating, and presents natural hybridization and admixture with its wild parents and the Asian cultivated rice Oryza sativa. Several ecotypes showed good aptitude in response to climatic change effects such as drought, flood, pests and diseases. This review presents several phenotypic diversity aspects on O. glaberrima and highlights its ecological and genetic structuring as well as the management of its diversity. Even if the African rice has undergone less diversification than the Asian rice in their evolutionary process, it presents some interesting assets which are being suggested to exploit through varietal improvement programs.

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Section: Natural Hybridizations Between O Glaberrima and Its Wild Formsmentioning

confidence: 99%

The African Rice Oryza glaberrima Steud: Knowledge Distribution and Prospects

Agnoun¹,

Biaou²,

Sié³

et al. 2012

IJB

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“…However, as in the case of O. longistaminata, no simple key of determination is available besides biochemical markers. Still O. longistaminata is isolated from its relatives by reproductive barriers particularly developped (C HU et al, 1969) K IANG et al, 1979). However, the present data suggest that it could also be of an original constitution close to the collection studied from Kwangsi Province.…”

Section: Introductionmentioning

confidence: 99%

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

Second¹

1985

Genetics Selection Evolution

116

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“…As mentioned before, although the F5 hybrids are completely pollen-sterile, backcrossing is possible as the female parent since 20-30 per cent embryosacs remain functional (Chu et a!., 1969). Fertility is recovered quickly by backcrosses and BCIFI and BC2F1 produce selfed progenies (Sano et aL, 1980).…”

Section: Discussionmentioning

confidence: 99%

“…The two cultivated rice species, Oryza sativa and 0. glaberrima, are isolated from each other by an F1 sterility barriers although their chromosomes (n = 12) normally pair in the hybrid (Morinaga and Kuriyama, 1957;Chu et a!., 1969). They can be distinguished by a few distinct characteristics such as the short, tough ligules and few secondary panicle branches of 0. glaberrima compared with the long ligules and many secondary panicle branches of 0. sativa.…”

Section: Methodsmentioning

confidence: 99%

The direction of pollen flow between two co-occurring rice species, Oryza sativa and O. glaberrima

Sano

1989

Heredity

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Two cultivated rice species, Oryza sativa L. and 0. glaberrima Steud., are often grown mixed in farmers' fields in West Africa. Two sympatric species were collected from two different fields. The frequency of interspecific hybridization between the two species was estimated from the seeds harvested in farmers' fields and in artificial mixtures. The two species were isolated by prezygotic isolating barriers such as autogamy and differences in time of flowering, however, the isolation was incomplete. The frequency of hybridization varied from ft8 to 45 per cent. In addition, all 87 hybrids were found from the seeds which 0. glaberrima produced. This shows that pollen How occurs from 0. sativa to 0. glaberrima when they hybridize. Generally, 0. glaberrima had a higher per cent of exserted stigmas as compared with 0. sativa. The direction of pollen flow appeared to be explained by a higher efficiency of pollen capture in 0. glaberrima. The genetic consequences were also discussed in relation to gene flow between two distantly related species.

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Reproductive Barriers Distributed in Cultivated Rice Species and Their Wild Relatives

Cited by 93 publications

References 34 publications

The African Rice Oryza glaberrima Steud: Knowledge Distribution and Prospects

The African Rice Oryza glaberrima Steud: Knowledge Distribution and Prospects

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

The direction of pollen flow between two co-occurring rice species, Oryza sativa and O. glaberrima

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