Molecular relationships between Australian annual wild rice, Oryza meridionalis, and two related perennial forms

Sotowa, Masahiro, Ootsuka, Kenta, Kobayashi, Yuu, Hao, Yin, Tanaka, Katsunori, Ichitani, Katsuyuki, Flowers, Jonathan M., Purugganan, Michael D., Nakamura, Ikuo, Sato, Yo-Ichiro, Sato, Tadashi, Crayn, Darren, Simon, Bryan, Waters, Daniel L. E., Henry, Robert J. and Ishikawa, Ryuji (2013) Molecular relationships between Australian annual wild rice, Oryza meridionalis, and two related perennial forms. Rice, 6 . doi:10.1186/1939-8433-6-26


Author Sotowa, Masahiro
Ootsuka, Kenta
Kobayashi, Yuu
Hao, Yin
Tanaka, Katsunori
Ichitani, Katsuyuki
Flowers, Jonathan M.
Purugganan, Michael D.
Nakamura, Ikuo
Sato, Yo-Ichiro
Sato, Tadashi
Crayn, Darren
Simon, Bryan
Waters, Daniel L. E.
Henry, Robert J.
Ishikawa, Ryuji
Title Molecular relationships between Australian annual wild rice, Oryza meridionalis, and two related perennial forms
Formatted title
Molecular relationships between Australian annual wild rice, Oryza meridionalis, and two related perennial forms
Journal name Rice   Check publisher's open access policy
ISSN 1939-8425
1939-8433
Publication date 2013-10-28
Year available 2013
Sub-type Article (original research)
DOI 10.1186/1939-8433-6-26
Open Access Status DOI
Volume 6
Total pages 18
Place of publication New York, NY, United States
Publisher Springer New York
Collection year 2014
Language eng
Formatted abstract
Background: The perennial, Oryza rufipogon distributed from Asia to Australia and the annual O. meridionalis indigenous to Australia are AA genome species in the Oryza. However, recent research has demonstrated that the Australian AA genome perennial populations have maternal genomes more closely related to those of O. meridionalis than to those found in Asian populations of O. rufipogon suggesting that the Australian perennials may represent a new distinct gene pool for rice.
Results: Analysis of an Oryza core collection covering AA genome species from Asia to Oceania revealed that some Oceania perennials had organellar genomes closely related to that of O meridionalis (meridionalis-type). O. rufipogon accessions from New Guinea carried either the meridionalis-type or rufirpogon-type (like O. rufipogon) organellar genomes. Australian perennials carried only the meridionalis-type organellar genomes when accompanied by the rufipogon-type nuclear genome. New accessions were collected to better characterize the Australian perennials, and their life histories (annual or perennial) were confirmed by field observations. All of the material collected carried only meridionalis-type organellar genomes. However, there were two distinct perennial groups. One of them carried an rufipogon-type nuclear genome similar to the Australian O. rufipogon in the core collection and the other carried an meridionalis-type nuclear genome not represented in the existing collection. Morphologically the rufipogon-type shared similarity with Asian O. rufipogon. The meridionalis-type showed some similarities to O. meridionalis such as the short anthers usually characteristic of annual populations. However, the meridionalis-type perennial was readily distinguished from O. meridionalis by the presence of a larger lemma and higher number of spikelets.
Conclusion: Analysis of current accessions clearly indicated that there are two distinct types of Australian perennials. Both of them differed genetically from Asian O. rufipogon. One lineage is closely related to O. meridionalis and another to Asian O. rufipogon. The first was presumed to have evolved by divergence from O. meridionalis becoming differentiated as a perennial species in Australia indicating that it represents a new gene pool. The second, apparently derived from Asian O. rufipogon, possibly arrived in Australia later.
Keyword Genetic divergence
Australia
Perennial
Annual
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article # 26

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2014 Collection
 
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