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https://www.readbyqxmd.com/read/28238052/estimation-of-loci-involved-in-non-shattering-of-seeds-in-early-rice-domestication
#1
Ryo Ishikawa, Akinori Nishimura, Than Myint Htun, Ryo Nishioka, Yumi Oka, Yuki Tsujimura, Chizuru Inoue, Takashige Ishii
Rice (Oryza sativa L.) is widely cultivated around the world and is known to be domesticated from its wild form, O. rufipogon. A loss of seed shattering is one of the most obvious phenotypic changes selected for during rice domestication. Previously, three seed-shattering loci, qSH1, sh4, and qSH3 were reported to be involved in non-shattering of seeds of Japonica-type cultivated rice, O. sativa cv. Nipponbare. In this study, we focused on non-shattering characteristics of O. sativa Indica cv. IR36 having functional allele at qSH1...
February 25, 2017: Genetica
https://www.readbyqxmd.com/read/28176282/evolutionary-analysis-of-the-sub1-locus-across-the-oryza-genomes
#2
Railson Schreinert Dos Santos, Daniel da Rosa Farias, Camila Pegoraro, Cesar Valmor Rombaldi, Takeshi Fukao, Rod A Wing, Antonio Costa de Oliveira
BACKGROUND: Tolerance to complete submergence is recognized in a limited number of Asian rice (Oryza sativa L.) varieties, most of which contain submergence-inducible SUB1A on the polygenic SUBMERGENCE-1 (SUB1) locus. It has been shown that the SUB1 locus encodes two Ethylene-Responsive Factor (ERF) genes, SUB1B and SUB1C, in all O. sativa varieties. These genes were also found in O rufipogon and O nivara, wild relatives of O. sativa. However, detailed analysis of the polygenic locus in other Oryza species has not yet been made...
December 2017: Rice
https://www.readbyqxmd.com/read/28107426/identification-of-micrornas-in-response-to-drought-in-common-wild-rice-oryza-rufipogon-griff-shoots-and-roots
#3
Jing-Wen Zhang, Yan Long, Man-de Xue, Xing-Guo Xiao, Xin-Wu Pei
BACKGROUND: Drought is the most important factor that limits rice production in drought-prone environments. Plant microRNAs (miRNAs) are involved in biotic and abiotic stress responses. Common wild rice (Oryza rufipogon Griff.) contains abundant drought-resistant genes, which provide an opportunity to explore these excellent resources as contributors to improve rice resistance, productivity, and quality. RESULTS: In this study, we constructed four small RNA libraries, called CL and CR from PEG6000-free samples and DL and DR from PEG6000-treated samples, where 'R' indicates the root tissue and 'L' indicates the shoot tissue...
2017: PloS One
https://www.readbyqxmd.com/read/28087781/deleterious-variants-in-asian-rice-and-the-potential-cost-of-domestication
#4
Qingpo Liu, Yongfeng Zhou, Peter L Morrell, Brandon S Gaut
Many SNPs are predicted to encode deleterious amino acid variants. These slightly deleterious mutations can provide unique insights into population history, the dynamics of selection, and the genetic bases of phenotypes. This is especially true for domesticated species, where a history of bottlenecks and selection may affect the frequency of deleterious variants and signal a 'cost of domestication'. Here we investigated the numbers and frequencies of deleterious variants in Asian rice (O. sativa), focusing on two varieties (japonica and indica) and their wild relative (O...
January 12, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28087768/the-rice-paradox-multiple-origins-but-single-domestication-in-asian-rice
#5
Jae Young Choi, Adrian E Platts, Dorian Q Fuller, Yue-Ie Hsing, Rod A Wing, Michael D Purugganan
The origin of domesticated Asian rice (Oryza sativa) has been a contentious topic, with conflicting evidence for either single or multiple domestication of this key crop species. We examined the evolutionary history of domesticated rice by analyzing de novo assembled genomes from domesticated rice and its wild progenitors. Our results indicate multiple origins, where each domesticated rice subpopulation (japonica, indica, and aus) arose separately from progenitor O. rufipogon and/or O. nivara Coalescence-based modeling of demographic parameters estimate that the first domesticated rice population to split off from O...
January 12, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/27990555/root-associated-bacterial-diversities-of-oryza-rufipogon-and-oryza-sativa-and-their-influencing-environmental-factors
#6
Lei Tian, Xue Zhou, Lina Ma, Shangqi Xu, Fahad Nasir, Chunjie Tian
Oryza rufipogon is the ancestor of human-cultivated Oryza sativa. However, little is known about the difference between the root-associated microorganisms of O. rufipogon and O. sativa. In this study, the root-associated bacteria of O. rufipogon, Leersia hexandra, and O. sativa from different latitudes in China were studied by DGGE analysis. Their bacterial community structures were compared by principal component analysis. The relationship between root-associated bacteria and soil properties was explored by canonical correspondence analysis...
December 18, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27986805/emergence-of-a-novel-chimeric-gene-underlying-grain-number-in-rice
#7
Hao Chen, Yanyan Tang, Jianfeng Liu, Lubin Tan, Jiahuan Jiang, Mumu Wang, Zuofeng Zhu, Xianyou Sun, Chuanqing Sun
Grain number is an important factor in determining grain production of rice (Oryza sativa L.). The molecular genetic basis for grain number is complex. Discovering new genes involved in regulating rice grain number increases our knowledge regarding its molecular mechanisms and aids breeding programs. Here, we identified GRAINS NUMBER 2 (GN2), a novel gene that is responsible for rice grain number, from "Yuanjiang" common wild rice (O. rufipogon Griff.). Transgenic plants overexpressing GN2 showed less grain number, reduced plant height, and later heading date than control plants...
February 2017: Genetics
https://www.readbyqxmd.com/read/27941309/gene-interaction-at-seed-awning-loci-in-the-genetic-background-of-wild-rice
#8
Mai Ikemoto, Mitsuharu Otsuka, Pham Thien Thanh, Phuong Dang Thai Phan, Ryo Ishikawa, Takashige Ishii
Seed awning is one of the important traits for successful propagation in wild rice. During the domestication of rice by ancient humans, plants with awnless seeds may have been selected because long awns hindered collection and handling activities. To investigate domestication of awnless rice, QTL analysis for seed awning was first carried out using backcross recombinant inbred lines between Oryza sativa Nipponbare (recurrent parent) and O. rufipogon W630 (donor parent). Two strong QTLs were detected in the same regions as known major seed-awning loci, An-1 and RAE2...
December 9, 2016: Genes & Genetic Systems
https://www.readbyqxmd.com/read/27933072/development-and-evaluation-of-chromosome-segment-substitution-lines-carrying-overlapping-chromosome-segments-of-the-whole-wild-rice-genome
#9
Dewei Yang, Xinfu Ye, Xianghua Zheng, Chaoping Cheng, Ning Ye, Fenghuang Huang
Common wild rice (Oryza rufipogon Griff.) represents an important resource for rice improvement. Genetic populations provide the basis for a wide range of genetic and genomic studies. In particular, chromosome segment substitution lines (CSSLs) are most powerful tools for the detection and precise mapping of quantitative trait loci (QTLs). In this study, 146 CSSLs were produced; they were derived from the crossing and back-crossing of two rice cultivars: Dongnanihui 810 (Oryza sativa L.), an indica rice cultivar as the recipient, and ZhangPu wild rice, a wild rice cultivar as the donor...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27889940/sequencing-of-australian-wild-rice-genomes-reveals-ancestral-relationships-with-domesticated-rice
#10
Marta Brozynska, Dario Copetti, Agnelo Furtado, Rod A Wing, Darren Crayn, Glen Fox, Ryuji Ishikawa, Robert J Henry
The related A genome species of the Oryza genus are the effective gene pool for rice. Here we report draft genomes for two Australian wild A genome taxa: O. rufipogon-like population, referred to as Taxon A and O. meridionalis-like population, referred to as Taxon B. These two taxa were sequenced and assembled by integration of short and long read next generation sequencing (NGS) data to create a genomic platform for a wider rice gene pool. Here we report that, despite the distinct chloroplast genome, the nuclear genome of the Australian Taxon A, has a sequence that is much closer to that of domesticated rice (O...
November 27, 2016: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/27882529/qtl-mapping-of-grain-quality-traits-using-introgression-lines-carrying-oryza-rufipogon-chromosome-segments-in-japonica-rice
#11
Yeo-Tae Yun, Chong-Tae Chung, Young-Ju Lee, Han-Jung Na, Jae-Chul Lee, Sun-Gye Lee, Kwang-Won Lee, Young-Hwan Yoon, Ju-Won Kang, Hyun-Sook Lee, Jong-Yeol Lee, Sang-Nag Ahn
BACKGROUND: Improved eating quality is a major breeding target in japonica rice due to market demand. Consequently, quantitative trait loci (QTL) for glossiness of cooked rice and amylose content associated with eating quality have received much research focus because of their importance in rice quality. RESULTS: In this study, QTL associated with 12 grain quality traits were identified using 96 introgression lines (IL) of rice developed from an interspecific cross between the Korean elite O...
December 2016: Rice
https://www.readbyqxmd.com/read/27872859/mapping-qtls-for-fertility-restoration-of-different-cytoplasmic-male-sterility-types-in-rice-using-two-oryza-sativa-%C3%A3-o-rufipogon-backcross-inbred-line-populations
#12
Biao-Lin Hu, Jian-Kun Xie, Yong Wan, Jin-Wei Zhang, Fan-Tao Zhang, Xia Li
Hybrid rice breeding using cytoplasmic male sterility/fertility restoration (CMS/Rf) systems plays an important role in ensuring global food security. Two backcross inbred line (BIL) populations derived from either Xieqingzao B (XB)//XB/Dongxiang wild rice (DWR) (XXD) or XB//DWR/XB (XDX) were used to detect quantitative trait loci (QTLs) for fertility restoration of Dwarf wild abortive- (DA-), Indonesia Paddy- (ID-), and DWR-type CMS in rice. Lines with ID- and DA-type CMS were testcrossed with both the XXD- and XDX-BILs, while the line with DWR-type CMS was testcrossed with the XDX-BILs only...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27861933/a-single-base-change-explains-the-independent-origin-of-and-selection-for-the-nonshattering-gene-in-african-rice-domestication
#13
Khin Thanda Win, Yoshiyuki Yamagata, Kazuyuki Doi, Kazuhiro Uyama, Yasuko Nagai, Yosuke Toda, Takahiro Kani, Motoyuki Ashikari, Hideshi Yasui, Atsushi Yoshimura
Reduced seed shattering was a critical evolutionary step in crop domestication. Two cultivated rice species, Oryza sativa and Oryza glaberrima, were independently domesticated from the wild species Oryza rufipogon in Asia and Oryza barthii in Africa, respectively. A single nucleotide polymorphism (SNP) in the c gene, which encodes a trihelix transcription factor, causes nonshattering in O. sativa. However, the genetic mechanism of nonshattering in O. glaberrima is poorly understood. We conducted an association analysis for the coding sequences of SH3/SH4 in AA- genome rice species and the mutation suggested to cause nonshattering was demonstrated to do so using a positional-cloning approach in the O...
November 12, 2016: New Phytologist
https://www.readbyqxmd.com/read/27771250/characterization-and-evolutionary-analysis-of-ent-kaurene-synthase-like-genes-from-the-wild-rice-species-oryza-rufipogon
#14
Tomonobu Toyomasu, Koji Miyamoto, Matthew R Shenton, Arisa Sakai, Chizu Sugawara, Kiyotaka Horie, Hiroshi Kawaide, Morifumi Hasegawa, Masaru Chuba, Wataru Mitsuhashi, Hisakazu Yamane, Nori Kurata, Kazunori Okada
Cultivated rice (Oryza sativa) possesses various labdane-related diterpene synthase genes, homologs of ent-copalyl diphosphate synthase (CPS) and ent-kaurene synthase (KS) that are responsible for the biosynthesis of phytohormone gibberellins. The CPS homologs and KS like (KSL) homologs successively converted geranylgeranyl diphosphate to cyclic diterpene hydrocarbons via ent-copalyl diphosphate or syn-copalyl diphosphate in O. sativa. Consequently, a variety of labdane-related diterpenoids, including phytoalexin phytocassanes, momilactones and oryzalexins, have been identified from cultivated rice...
October 19, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27739878/effects-of-different-treatments-of-fly-ash-and-mining-soil-on-growth-and-antioxidant-protection-of-indian-wild-rice
#15
Sidhanta Sekhar Bisoi, Swati S Mishra, Jijnasa Barik, Debabrata Panda
The aim of the present study was investigation the effects of fly ash and mining soil on growth and antioxidant protection of two cultivars of Indian wild rice (Oryza nivara and Oryza rufipogon) for possible phytoremediation and restoration of metal contaminated site. In this study, Indian wild rice showed significant changes in germination, growth and biochemical parameters after exposure to different ratio of fly ash and mining soil with garden soil. There was significant reduction of germination, fresh weight, dry weight, leaf chlorophyll content, leaf area, SPAD index, proteins, and activities of antioxidant enzymes in both cultivars of the wild rice grown in 100% fly ash and mining soil compared to the plants grown in 100% garden soil...
October 14, 2016: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/27730519/population-dynamics-among-six-major-groups-of-the-oryza-rufipogon-species-complex-wild-relative-of-cultivated-asian-rice
#16
HyunJung Kim, Janelle Jung, Namrata Singh, Anthony Greenberg, Jeff J Doyle, Wricha Tyagi, Jong-Wook Chung, Jennifer Kimball, Ruaraidh Sackville Hamilton, Susan R McCouch
BACKGROUND: Understanding population structure of the wild progenitor of Asian cultivated rice (O. sativa), the Oryza rufipogon species complex (ORSC), is of interest to plant breeders and contributes to our understanding of rice domestication. A collection of 286 diverse ORSC accessions was evaluated for nuclear variation using genotyping-by-sequencing (113,739 SNPs) and for chloroplast variation using Sanger sequencing (25 polymorphic sites). RESULTS: Six wild subpopulations were identified, with 25 % of accessions classified as admixed...
December 2016: Rice
https://www.readbyqxmd.com/read/27729434/little-white-lies-pericarp-color-provides-insights-into-the-origins-and-evolution-of-southeast-asian-weedy-rice
#17
Yongxia Cui, Beng Kah Song, Lin-Feng Li, Ya-Ling Li, Zhongyun Huang, Ana L Caicedo, Yulin Jia, Kenneth M Olsen
Weedy rice is a conspecific form of cultivated rice (Oryza sativa L.) that infests rice fields and results in severe crop losses. Weed strains in different world regions appear to have originated multiple times from different domesticated and/or wild rice progenitors. In the case of Malaysian weedy rice, a multiple-origin model has been proposed based on neutral markers and analyses of domestication genes for hull color and seed shattering. Here, we examined variation in pericarp (bran) color and its molecular basis to address how this trait evolved in Malaysian weeds and its possible role in weed adaptation...
December 7, 2016: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/27725674/multi-step-formation-evolution-and-functionalization-of-new-cytoplasmic-male-sterility-genes-in-the-plant-mitochondrial-genomes
#18
Huiwu Tang, Xingmei Zheng, Chuliang Li, Xianrong Xie, Yuanling Chen, Letian Chen, Xiucai Zhao, Huiqi Zheng, Jiajian Zhou, Shan Ye, Jingxin Guo, Yao-Guang Liu
New gene origination is a major source of genomic innovations that confer phenotypic changes and biological diversity. Generation of new mitochondrial genes in plants may cause cytoplasmic male sterility (CMS), which can promote outcrossing and increase fitness. However, how mitochondrial genes originate and evolve in structure and function remains unclear. The rice Wild Abortive type of CMS is conferred by the mitochondrial gene WA352c (previously named WA352) and has been widely exploited in hybrid rice breeding...
January 2017: Cell Research
https://www.readbyqxmd.com/read/27634315/gad1-encodes-a-secreted-peptide-that-regulates-grain-number-grain-length-and-awn-development-in-rice-domestication
#19
Jing Jin, Lei Hua, Zuofeng Zhu, Lubin Tan, Xinhui Zhao, Weifeng Zhang, Fengxia Liu, Yongcai Fu, Hongwei Cai, Xianyou Sun, Ping Gu, Daoxin Xie, Chuanqing Sun
Cultivated rice (Oryza sativa) was domesticated from wild rice (Oryza rufipogon), which typically displays fewer grains per panicle and longer grains than cultivated rice. In addition, wild rice has long awns, whereas cultivated rice has short awns or lacks them altogether. These changes represent critical events in rice domestication. Here, we identified a major gene, GRAIN NUMBER, GRAIN LENGTH AND AWN DEVELOPMENT1 (GAD1), that regulates those critical changes during rice domestication. GAD1 is located on chromosome 8 and is predicted to encode a small secretary signal peptide belonging to the EPIDERMAL PATTERNING FACTOR-LIKE family...
October 2016: Plant Cell
https://www.readbyqxmd.com/read/27598392/nuclear-and-chloroplast-dna-variation-provides-insights-into-population-structure-and-multiple-origin-of-native-aromatic-rices-of-odisha-india
#20
Pritesh Sundar Roy, Gundimeda Jwala Narasimha Rao, Sudipta Jena, Rashmita Samal, Ashok Patnaik, Sasank Sekhar Chyau Patnaik, Nitiprasad Namdeorao Jambhulkar, Srigopal Sharma, Trilochan Mohapatra
A large number of short grain aromatic rice suited to the agro-climatic conditions and local preferences are grown in niche areas of different parts of India and their diversity is evolved over centuries as a result of selection by traditional farmers. Systematic characterization of these specialty rices has not been attempted. An effort was made to characterize 126 aromatic short grain rice landraces, collected from 19 different districts in the State of Odisha, from eastern India. High level of variation for grain quality and agronomic traits among these aromatic rices was observed and genotypes having desirable phenotypic traits like erect flag leaf, thick culm, compact and dense panicles, short plant stature, early duration, superior yield and grain quality traits were identified...
2016: PloS One
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