Gene Flow from Cultivated Rice (Oryza sativa) to its Weedy and Wild Relatives

Chen, Li Juan; Lee, Dong Sun; Song, Zhi; Suh, Hak-Soo; Lu, Bao‐Rong

doi:10.1093/aob/mch006

Cited by 293 publications

(253 citation statements)

References 22 publications

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“…Hybridisationintrogression representing the gene flow between cultivated rice and wild rice has been widely observed in nature and proven by designed field experiments [11,40,64,65]. Wild rice occurs only in tropical lowlands, whereas indica and japonica rice cultivars are usually associated with cultivation at different altitudes or latitudes.…”

Section: Genetics Of Indica-japonica Differentiation In Wild Ricementioning

confidence: 99%

Was Asian Rice (Oryza sativa) Domesticated More Than Once?

Vaughan

Tomooka

2008

Rice

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Recently, a dual or multiple origin of domesticated rice has been the prevailing opinion among rice scientists because rice is clearly differentiated into two major varietal groups, indica and japonica, and several minor groups. Molecular clock studies that suggested that divergence in the A-genome wild rice genepool occurred prior to domestication gave further weight to the opinion that rice had a dual origin. However, recent analysis of the major gene that is responsible for the difference in degree of shattering between rice and wild rice has revealed that it is the same mutation in indica and japonica rice, which is not compatible with a dual origin of domesticated rice. Here, we discuss the geographic and genetic reasons why a single origin for domesticated rice is compatible with current data regarding the evolution of rice. The apparently conflicting data regarding the origin of rice can be resolved by the role hybridisation-introgression has played during rice evolution since domestication.

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Section: Genetics Of Indica-japonica Differentiation In Wild Ricementioning

confidence: 99%

Was Asian Rice (Oryza sativa) Domesticated More Than Once?

Vaughan

Tomooka

2008

Rice

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“…Moreover, recent studies have shown that low outcrossing rates do not prevent cultivated genes from moving in sympatric wild populations. These studies include both, autogamous and/or predominantly insect-pollinated species like soybean, bean or cotton (Ibarra Perez et al, 1997;Nakamaya and Yamaguchi, 2002;Van Deynze et al, 2005), as well as windpollinated autogamous species as rice or foxtail millet (Chen et al, 2004;Song et al, 2003;Wang et al, 1997;Zhang et al, 2003).…”

Section: D'andrea Et Almentioning

confidence: 99%

Hybridization rates between lettuce (Lactuca sativa) and its wild relative (L. serriola) under field conditions

D’Andrea

Felber

Guadagnuolo

2008

Environ. Biosafety Res.

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. Progeny was screened morphologically for detecting natural hybrids. Prior to the experiment, specific RAPD markers were used to confirm that morphological characters were reliable for hybrid identification. Hybridization occurred up to the maximal distance tested (40 m), and hybridization rates varied between 0 to 26%, decreasing with distance. More than 80% of the wild plants produced at least one hybrid (incidence of hybridization, IH) at 0 m and 1 m. It equaled 4 to 5% at 40 m. In sympatric crop-wild populations, cross-pollination between cultivated lettuce and its wild relative has to be seen as the rule rather than the exception for short distances.

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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%