Genetic Diversity, Genetic Erosion, and Conservation of the Two Cultivated Rice Species (Oryza sativa and Oryza glaberrima) and Their Close Wild Relatives

2015 ◽  
pp. 35-73
Author(s):  
Ahmadi Nourollah
Keyword(s):  
Genetic Diversity ◽  
Oryza Sativa ◽  
Genetic Erosion ◽  
Wild Relatives ◽  
Oryza Glaberrima ◽  
Cultivated Rice

scholarly journals Molecular characterization and genetic diversity of different genotypes of Oryza sativa and Oryza glaberrima

2017 ◽  
Vol 30 ◽  
pp. 48-57 ◽  
Author(s):  
Caijin Chen ◽  
Wenchuang He ◽  
Tondi Yacouba Nassirou ◽  
Athanase Nsabiyumva ◽  
Xilong Dong ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Oryza Sativa ◽  
Molecular Characterization ◽  
Oryza Glaberrima

scholarly journals Chloroplast DNA polymorphism and evolutional relationships between Asian cultivated rice (Oryza sativa) and its wild relatives (O. rufipogon)

2012 ◽  
Vol 11 (4) ◽  
pp. 4418-4431 ◽  
Author(s):  
W.J. Li ◽  
B. Zhang ◽  
G.W. Huang ◽  
G.P. Kang ◽  
M.Z. Liang ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Chloroplast Dna ◽  
Dna Polymorphism ◽  
Wild Relatives ◽  
Cultivated Rice

scholarly journals Variations of Floral Traits in Asian Cultivated Rice (Oryza sativa L.) and its Wild Relatives (O. rufipogon Griff.)

2003 ◽  
Vol 53 (4) ◽  
pp. 345-352 ◽  
Author(s):  
Yusaku Uga ◽  
Yoshimichi Fukuta ◽  
Ryo Ohsawa ◽  
Tatsuhito Fujimura
Keyword(s):  
Oryza Sativa ◽  
Oryza Sativa L ◽  
Wild Relatives ◽  
Floral Traits ◽  
Cultivated Rice

scholarly journals Genetic Structure and Diversity of Rice From Certified Cultivars and Farmer’s Fields in Burkina Faso

2021 ◽  
Author(s):  
Mariam BARRO ◽  
Abdourasmane KONATE ◽  
Issa WONNI ◽  
Abalo Itolou KASSANKOGNO ◽  
François SABOT ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Oryza Sativa ◽  
West Africa ◽  
Burkina Faso ◽  
Snp Array ◽  
Genetic Data ◽  
Genetic Group ◽  
Oryza Glaberrima ◽  
Rainfed Lowland ◽  
Rice Samples

Abstract Background: In West Africa, two rice species are cultivated, the African rice Oryza glaberrima and the Asian rice Oryza sativa, the second one being much more frequent. Despite its importance for food security in West Africa, the genetic diversity of Oryza sativa in farmer’s fields remains understudied in this region. Documenting the dynamics of diversity in the fields between landraces and improved cultivars is of importance to ensure rice cultivation adaptation to global change.In this study, we genotyped 77 rice samples from Burkina Faso using the C6AIR SNP array from IRRI. Among the studied samples, 27 were certified cultivars and 50 were sampled in rice fields from three geographical zones in western Burkina Faso, each zone comprising one irrigated area and a neighboring rainfed lowland. Obtained data were analyzed in the frame of the worldwide rice genetic diversity by using the 3K genomes as reference.Results: Most of the certified cultivars clustered with the indica genetic group, with a minority (26%) assigned to the japonica group. All except one of the rice samples from farmer’s fields belonged to the indica group. The peculiar one unexpectedly clustered with the Aus genetic group and originated from Tengrela (rainfed lowland in Karfiguela zone). This site, already known to differ in terms of agronomic practices, showed the highest genetic diversity compared to the five other sites, as well as highest genetic differentiation. Obtained genetic data confirmed the high global frequency of one cultivar, in accordance with the data from farmer’s interview. However, at the field level, genetic data rarely corresponded to the cultivar’s names obtained from farmer’s interviews.Conclusions: Overall we found a high genetic diversity in the studied samples from Burkina Faso (certified and field’s samples). We argue on the importance to document and preserve this agro-biodiversity as a prerequisite to face the current challenges of growing rice demand and global change. To this purpose, are required further scientific studies to refine our understanding of the dynamics of diversity in farmers’ fields, as well as a better knowledge of rice agro-biodiversity and awareness of its importance by rice farmers themselves.

scholarly journals Genetic Diversity Study of African Rice (Oryza glaberrima) and its Wild Relatives using Microsatellites Markers

2021 ◽  
pp. 75-87
Author(s):  
David Montcho ◽  
Mounirou Sow ◽  
Olufisayo Kolade ◽  
Roland Bocco ◽  
Clement Agbangla
Keyword(s):  
Genetic Diversity ◽  
Polymorphic Information Content ◽  
Wild Relatives ◽  
Oryza Glaberrima ◽  
Molecular Tools ◽  
Microsatellites Markers ◽  
Polymorphic Microsatellites ◽  
Locus Number ◽  
Genetic Diversity Study ◽  
Diversity Study

The Africa Rice Center Gene Bank hold about 2,500 accessions of Oryza glaberrima. To understand well the genetic diversity in O. glaberrima and its wild species, the use of molecular tools is prominent. The sample consisted of 217 accessions of O. glaberrima, 46 of O. barthii and 7 of O. sativa (checks) was genotyped with 21 polymorphic microsatellites markers. A total of 245 alleles were detected with average 11.67 alleles per locus. Number of alleles was ranged from 2 (RM124) to 20 (RM536). The polymorphic information content value was 0.49 while the heterozygosity was 0.091. The result showed that the sample can be clustered into four genotypic groups. Two groups among them were homogeneous. The first one consisted of O. barthii accessions with 82 alleles in total with average 3.90 alleles per locus. However, the second one consisted of only O. glaberrima accessions with 122 alleles with average 5.80 alleles per locus. O. glaberrima accessions were analyzed using model-based population structure. Results revealed two groups among O. glaberrima accessions. At the end, the identified core collection has 26 accessions consisted of 16 O. glaberrima and 10 O. barthii based on 21 microsatellites markers.

Geographic pattern of variation among Asian native rice cultivars (Oryza sativa L.) based on fifteen isozyme loci

Genome ◽  
1988 ◽  
Vol 30 (5) ◽  
pp. 782-792 ◽  
Author(s):  
J. C. Glaszmann
Keyword(s):  
Genetic Diversity ◽  
Oryza Sativa ◽  
Oryza Sativa L ◽  
Indian Subcontinent ◽  
Indica Rice ◽  
Japonica Rice ◽  
Geographic Pattern ◽  
Cultivated Rice ◽  
Rice Varieties ◽  
Himalayan Foothills

The geographic pattern of isozyme variation among rice varieties (Oryza sativa L.) in Asia is described based on an electrophoretic survey of 1688 accessions for 15 loci. The distribution patterns are strongly determined by the existence of several varietal groups that are characterized by contrasting multilocus types with dissimilar environmental and macrogeographic distributions. The two main groups correspond to the indica and japonica subspecies. Other types are frequently found in the Indian subcontinent, especially along the Himalayan foothills. These types are predominant in the Indus River basin. They are differentiated into four groups in the eastern part of the Himalayan foothills. There is variation within the groups. Non-random allele distributions are observed, such as regional clines and narrow localization of alleles. Diversity among indica rice is evenly distributed in whole tropical Asia. Variation among japonica rice shows the hilly part of continental Southeast Asia to be the region of highest genetic diversity and its probable area of origin. All this information provides a guide for further analysis aimed at elucidating the history of cultivated rice in Asia and, subsequently, in other continents.Key words: Asian rice, genetic diversity, isozymes, geographic distributions.

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