Chloroplast genome sequence confirms distinctness of Australian and Asian wild rice

Daniel L E Waters, Catherine J. Nock, Ryuji Ishikawa, Nicole Rice, Robert J. Henry

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)


Cultivated rice (Oryza sativa) is an AA genome Oryza species that was most likely domesticated from wild populations of O. rufipogon in Asia. O. rufipogon and O. meridionalis are the only AA genome species found within Australia and occur as widespread populations across northern Australia. The chloroplast genome sequence of O. rufipogon from Asia and Australia and O. meridionalis and O. australiensis (an Australian member of the genus very distant from O. sativa) was obtained by massively parallel sequencing and compared with the chloroplast genome sequence of domesticated O. sativa. Oryza australiensis differed in more than 850 sites single nucleotide polymorphism or indel from each of the other samples. The other wild rice species had only around 100 differences relative to cultivated rice. The chloroplast genomes of AustralianO. rufipogon and O.meridionalis were closely related with only 32 differences. The Asian O. rufipogon chloroplast genome (with only 68 differences) was closer to O. sativa than the Australian taxa (both with more than 100 differences). The chloroplast sequences emphasize the genetic distinctness of the Australian populations and their potential as a source of novel rice germplasm. The AustralianO. rufipogon may be a perennial form of O.meridionalis.

Original languageEnglish
Pages (from-to)211-217
Number of pages7
JournalEcology and Evolution
Issue number1
Publication statusPublished - 2012

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