Genetic diversity associated with conservation of endangered Dongxiang wild rice (Oryza rufipogon)

Xie, Jiankun; Agrama, H. A.; Kong, Deying; Zhuang, Jie‐Yun; Hu, Biaolin; Wan, Yat-wah; Wang, Yan

doi:10.1007/s10722-009-9498-z

Cited by 54 publications

(43 citation statements)

References 39 publications

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“…Genetic and ecological studies with wild rice natural populations are necessary to provide information for both ex situ or in situ conservation programs for these species (Xie et al, 2010). To date, there are quite a few studies concerning the genetic structure of the diploid O. glumaepatula populations (Akimoto et al, 1998;Buso et al, 1998;Brondani et al, 2005;Karasawa et al, 2007a,b;Veasey et al, 2008a), but very little has yet been published on the genetic structure and variability of the tetraploid American species (Agrama and Eizenga, 2008;Arrieta-Espínoza et al, 2005;Quesada et al, 2002;Veasey et al, 2008b).…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity of American wild rice species

Veasey¹,

Bressan²,

Zucchi³

et al. 2011

Sci. agric. (Piracicaba, Braz.)

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Studies on genetic diversity and genetic structure of natural populations are important in order to define strategies for in situ and ex situ conservation actions and for plant pre-breeding programs. Aiming to assess the genetic diversity and genetic structure of three wild American Oryza species with isozyme markers, 14 populations of the diploid O. glumaepatula (A gl A gl ), 11 populations of the tetraploid O. grandiglumis (CCDD) and five populations of the also tetraploid O. latifolia (CCDD) were studied. They were all originated from Rio Paraguay hydrographic basin and the Amazon. Four enzymes were used and they gave 40 polymorphic bands. The most polymorphic species was O. glumaepatula, followed by O. latifolia and O. grandiglumis. A cluster analysis with the Jaccard similarity coefficient separated the diploid from the two tetraploid species, and also the two tetraploid species. This separation was also evident on a scatter plot from a principal component analysis, suggesting that they should be treated as two separate species, although further studies are necessary to provide support for this affirmative. The AMOVA analyses showed a high intrapopulational variability for O. latifolia (67.6%) and O. grandiglumis (52.2%), when compared to their interpopulational variability (32.4% and 47.8%, respectively), which suggests the hypothesis of a higher degree of outcrossing events within these species. When studying the correlation between the Jaccard dissimilarity coefficient and geographic distances, a spatial genetic structure was observed for O. glumaepatula only. These results are important for defining strategies of both in situ and ex situ conservation.

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Section: Introductionmentioning

confidence: 99%

Genetic diversity of American wild rice species

Veasey¹,

Bressan²,

Zucchi³

et al. 2011

Sci. agric. (Piracicaba, Braz.)

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“…The nine populations of DXWR in isolated areas in 1978 had decreased to three by 2000 (Zhong et al, 2003). Because of this dramatic reduction, the unique genepool is now endangered, and it is imperative to conserve it for the effective use and protection of the remaining genetic resources (Xie et al, 2010).…”

Section: Conservation Of Dxwrmentioning

confidence: 99%

“…It has been the focus of wild rice conservation because it represents a rare genetic resource for the improvement of cultivated rice. During 1978 to 1982, nine wild rice populations growing at three sites in Dongxiang, including a total of 252 accessions, were collected and conserved in an ex situ conservation garden (Xie et al, 2010). By 2000, however, the nine natural wild rice populations had been reduced to three populations (Zhong et al, 2003;Yang et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of the Genetic Structure betweenIn Situ and Ex Situ Populations of DongxiangWild Rice (Oryza rufipogon Griff.)

Liu

Zheng

et al. 2017

Crop Science

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In situ and ex situ conservation are two main wild rice (Oryza rufipogon Griff.) protection strategies. Few studies have compared the genetic diversity and genetic structure of wild rice between ex situ and in situ populations. Thus in this study, 278 individuals collected from three in situ and nine ex situ populations of Dongxiang wild rice (DXWR) were genotyped using 32 microsatellite loci to compare their population genetic structure and genetic diversity. Model‐based grouping, neighbor‐joining tree, and principal coordinate analyses showed that there were significant differences in the population structure between in situ and ex situ populations. The in situ populations clustered into three major groups, which were in accordance with their geographical distribution (Anjiashan, Zhangtang, and Shuitaoshu). However, the nine ex situ populations of DXWR showed no differences among populations, and there was a high heterozygosity for each individual. In addition, one of the in situ populations (Zhangtang) was not represented in the ex situ conservation garden. Given the above results, we concluded that the germplasm of both in situ and ex situ populations are precious, and that the combination of these two conservation strategies is necessary to protect the germplasm resources of DXWR, but special emphasis should be placed on in situ conservation to better maintain their genetic identities. In addition, it is necessary to recollect genetic resources from in situ populations for ex situ conservation, especially from the Zhangtang population.

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“…Some QTLs in the vicinities of the lignin biosynthesis genes, such as caffeic acid-O-methyltransferase, cinnamoyl CoA-reductase, and cinnamyl alcohol dehydrogenase genes, or of the cellulose biosynthesis genes have been identified (Cardinal et al, 2003;Krakowsky et al, 2005;Truntzler et al, 2010). Dongxiang wild rice (Oryza rufipogon Griff., hereafter referred to as DWR) is a common wild rice located at 28°14′ N latitude and 116°30′ E longitude in Dongxiang county, Jiangxi province, China, which is considered to be the northernmost region in China and in the world where O. rufipogon is found (Xie et al, 2010). Wild relatives of cultivated rice are highly diversified and host various genes conferring resistance to biotic and abiotic stresses, thus providing a valuable gene pool for rice genetic improvement (Chen et al, 2010;Xie et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Mapping of quantitative trait loci for fiber and lignin contents from an interspecific cross Oryza sativa × Oryza rufipogon

Xie

Kong

Chen

et al. 2011

J. Zhejiang Univ. Sci. B

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Rice straw is always regarded as a by-product of rice production, but it could be a significant energy source for ruminant animals. Knowledge of the genetic variation and genetic architecture of cell wall traits will facilitate rice breeders by improving relevant traits through selective breeding and genetic engineering. The common wild rice, Oryza rufipogon Griff., which is considered to be the progenitor of Oryza sativa, has been widely utilized for the identification of genes of agronomic importance for rice genetic improvement. In the present study, the mapping of quantitative trait loci (QTLs) for acid detergent fiber (ADF), neutral detergent fiber (NDF), acid detergent lignin (ADL), and ADL/NDF ratio was carried out in two environments using a backcrossed inbred line (BIL) population derived from a cross between the recurrent parent Xieqingzao B (XB) and an accession of Dongxiang wild rice (DWR). The results indicated that all four traits tested were continuously distributed among the BILs, but many BILs showed transgressive segregation. A total of 16 QTLs were identified for the four traits, but no QTLs were in common in two environments, suggesting that environment has dramatic effects on fiber and lignin syntheses. Compared to the QTL positions for grain yield-related traits, there were no unfavorable correlations between grain yield components and cell wall traits in this population. The QTLs identified in this study are useful for the development of dual-purpose rice varieties that are high in grain yield and are also high in straw quality.

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Genetic diversity associated with conservation of endangered Dongxiang wild rice (Oryza rufipogon)

Cited by 54 publications

References 39 publications

Genetic diversity of American wild rice species

Genetic diversity of American wild rice species

Comparison of the Genetic Structure betweenIn Situ and Ex Situ Populations of DongxiangWild Rice (Oryza rufipogon Griff.)

Mapping of quantitative trait loci for fiber and lignin contents from an interspecific cross Oryza sativa × Oryza rufipogon

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