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https://www.readbyqxmd.com/read/28597326/identification-of-bakanae-disease-resistance-loci-in-japonica-rice-through-genome-wide-association-study
#1
Andrea Volante, Alessandro Tondelli, Maria Aragona, Maria Teresa Valente, Chiara Biselli, Francesca Desiderio, Paolo Bagnaresi, Slavica Matic, Maria Lodovica Gullino, Alessandro Infantino, Davide Spadaro, Giampiero Valè
BACKGROUND: Bakanae disease, caused by seed-borne Fusarium species, mainly F. fujikuroi, is a rice disease whose importance is considerably increasing in several rice growing countries, leading to incremental production losses. RESULTS: A germplasm collection of japonica rice was screened for F. fujikuroi resistance, allowing the identification of accessions with high-to-moderate levels of resistance to bakanae. A GWAS approach uncovered two genomic regions highly associated with the observed phenotypic variation for response to bakanae infection on the short arm of chromosome 1 (named as qBK1_628091) and on the long arm of chromosome 4 (named as qBK4_31750955)...
December 2017: Rice
https://www.readbyqxmd.com/read/28584974/high-resolution-mapping-of-qtls-for-heat-tolerance-in-rice-using-a-5k-snp-array
#2
Shanmugavadivel Ps, Amitha Mithra Sv, Chandra Prakash, Ramkumar Mk, Ratan Tiwari, Trilochan Mohapatra, Nagendra Kumar Singh
BACKGROUND: Heat stress is one of the major abiotic threats to rice production, next to drought and salinity stress. Incidence of heat stress at reproductive phase of the crop results in abnormal pollination leading to floret sterility, low seed set and poor grain quality. Identification of QTLs and causal genes for heat stress tolerance at flowering will facilitate breeding for improved heat tolerance in rice. In the present study, we used 272 F8 recombinant inbred lines derived from a cross between Nagina22, a well-known heat tolerant Aus cultivar and IR64, a heat sensitive popular Indica rice variety to map the QTLs for heat tolerance...
December 2017: Rice
https://www.readbyqxmd.com/read/28577284/overexpression-of-rice-auxilin-like-protein-xb21-induces-necrotic-lesions-up-regulates-endocytosis-related-genes-and-confers-enhanced-resistance-to-xanthomonas-oryzae-pv-oryzae
#3
Chang-Jin Park, Tong Wei, Rita Sharma, Pamela C Ronald
BACKGROUND: The rice immune receptor XA21 confers resistance to the bacterial pathogen, Xanthomonas oryzae pv. oryzae (Xoo). To elucidate the mechanism of XA21-mediated immunity, we previously performed a yeast two-hybrid screening for XA21 interactors and identified XA21 binding protein 21 (XB21). RESULTS: Here, we report that XB21 is an auxilin-like protein predicted to function in clathrin-mediated endocytosis. We demonstrate an XA21/XB21 in vivo interaction using co-immunoprecipitation in rice...
December 2017: Rice
https://www.readbyqxmd.com/read/28560587/evolutionary-relationships-and-expression-analysis-of-eul-domain-proteins-in-rice-oryza-sativa
#4
Kristof De Schutter, Mariya Tsaneva, Shubhada R Kulkarni, Pierre Rougé, Klaas Vandepoele, Els J M Van Damme
BACKGROUND: Lectins, defined as 'Proteins that can recognize and bind specific carbohydrate structures', are widespread among all kingdoms of life and play an important role in various biological processes in the cell. Most plant lectins are involved in stress signaling and/or defense. The family of Euonymus-related lectins (EULs) represents a group of stress-related lectins composed of one or two EUL domains. The latter protein domain is unique in that it is ubiquitous in land plants, suggesting an important role for these proteins...
December 2017: Rice
https://www.readbyqxmd.com/read/28547737/08sg2-osbak1-regulates-grain-size-and-number-and-functions-differently-in-indica-and-japonica-backgrounds-in-rice
#5
Hua Yuan, Shijun Fan, Juan Huang, Shijie Zhan, Shifu Wang, Peng Gao, Weilan Chen, Bin Tu, Bingtian Ma, Yuping Wang, Peng Qin, Shigui Li
BACKGROUND: Both grain size and grain number are significant for rice yield. In the past decade, a number of genes related to grain size and grain number have been documented, however, the regulatory mechanisms underlying them remains ambiguous. RESULTS: We identified a rice small grain (sg2) mutant in an EMS mutant library generated from an indica variety, Shuhui498. Using the MutMap gene mapping strategy, we identified two linkage regions on chromosome 7 and 8, respectively, consistent with the segregation ratios in the F2 population...
December 2017: Rice
https://www.readbyqxmd.com/read/28547736/rice-bran-metabolome-contains-amino-acids-vitamins-cofactors-and-phytochemicals-with-medicinal-and-nutritional-properties
#6
Iman Zarei, Dustin G Brown, Nora Jean Nealon, Elizabeth P Ryan
BACKGROUND: Rice bran is a functional food that has shown protection against major chronic diseases (e.g. obesity, diabetes, cardiovascular disease and cancer) in animals and humans, and these health effects have been associated with the presence of bioactive phytochemicals. Food metabolomics uses multiple chromatography and mass spectrometry platforms to detect and identify a diverse range of small molecules with high sensitivity and precision, and has not been completed for rice bran...
December 2017: Rice
https://www.readbyqxmd.com/read/28534133/silencing-of-the-rice-gene-lrr1-compromises-rice-xa21-transcript-accumulation-and-xa21-mediated-immunity
#7
Daniel F Caddell, Chang-Jin Park, Nicholas C Thomas, Patrick E Canlas, Pamela C Ronald
BACKGROUND: The rice immune receptor XA21 confers resistance to Xanthomonas oryzae pv. oryzae (Xoo), the causal agent of bacterial leaf blight. We previously demonstrated that an auxilin-like protein, XA21 BINDING PROTEIN 21 (XB21), positively regulates resistance to Xoo. RESULTS: To further investigate the function of XB21, we performed a yeast two-hybrid screen. We identified 22 unique XB21 interacting proteins, including LEUCINE-RICH REPEAT PROTEIN 1 (LRR1), which we selected for further analysis...
December 2017: Rice
https://www.readbyqxmd.com/read/28527137/genome-based-identification-of-heterotic-patterns-in-rice
#8
Ulrike Beukert, Zuo Li, Guozheng Liu, Yusheng Zhao, Nadhigade Ramachandra, Vilson Mirdita, Fabiano Pita, Klaus Pillen, Jochen Christoph Reif
BACKGROUND: Hybrid rice breeding facilitates to increase grain yield and yield stability. Long-term success of hybrid breeding depends on the recognition of high-yielding complementary heterotic patterns, which is lacking in crops like rice. RESULT: The main goal of this study was to evaluate the potential and limits to use genomics for establishing heterotic patterns in rice. For this purpose, data of a commercial hybrid rice breeding program targeted to India was analyzed, including 1,960 phenotyped hybrids from three market segments and 262 genotyped parental lines...
December 2017: Rice
https://www.readbyqxmd.com/read/28523639/association-mapping-of-yield-and-yield-related-traits-under-reproductive-stage-drought-stress-in-rice-oryza-sativa-l
#9
B P Mallikarjuna Swamy, Noraziyah Abd Aziz Shamsudin, Site Noorzuraini Abd Rahman, Ramil Mauleon, Wickneswari Ratnam, Ma Teressa Sta Cruz, Arvind Kumar
BACKGROUND: The identification and introgression of major-effect QTLs for grain yield under drought are some of the best and well-proven approaches for improving the drought tolerance of rice varieties. In the present study, we characterized Malaysian rice germplasm for yield and yield-related traits and identified significant trait marker associations by structured association mapping. RESULTS: The drought screening was successful in screening germplasm with a yield reduction of up to 60% and heritability for grain yield under drought was up to 78%...
December 2017: Rice
https://www.readbyqxmd.com/read/28500411/a-hairy-leaf-gene-blanket-leaf-of-wild-oryza-nivara-increases-photosynthetic-water-use-efficiency-in-rice
#10
Norimitsu Hamaoka, Hideshi Yasui, Yoshiyuki Yamagata, Yoko Inoue, Naruto Furuya, Takuya Araki, Osamu Ueno, Atsushi Yoshimura
BACKGROUND: High water use efficiency is essential to water-saving cropping. Morphological traits that affect photosynthetic water use efficiency are not well known. We examined whether leaf hairiness improves photosynthetic water use efficiency in rice. RESULTS: A chromosome segment introgression line (IL-hairy) of wild Oryza nivara (Acc. IRGC105715) with the genetic background of Oryza sativa cultivar 'IR24' had high leaf pubescence (hair). The leaf hairs developed along small vascular bundles...
December 2017: Rice
https://www.readbyqxmd.com/read/28500410/erratum-to-aldo-ketoreductase-1-akr1-improves-seed-longevity-in-tobacco-and-rice-by-detoxifying-reactive-cytotoxic-compounds-generated-during-ageing
#11
Kodadinne Narayana Nisarga, Ramu S Vemanna, Babitha Kodekallu Chandrashekar, Hanumantha Rao, Amaranatha Reddy Vennapusa, Ashwini Narasimaha, Udayakumar Makarla, Mohan Raju Basavaiah
No abstract text is available yet for this article.
December 2017: Rice
https://www.readbyqxmd.com/read/28493203/dissection-of-broad-spectrum-resistance-of-the-thai-rice-variety-jao-hom-nin-conferred-by-two-resistance-genes-against-rice-blast
#12
Chaivarakun Chaipanya, Mary Jeanie Telebanco-Yanoria, Berlaine Quime, Apinya Longya, Siripar Korinsak, Siriporn Korinsak, Theerayut Toojinda, Apichart Vanavichit, Chatchawan Jantasuriyarat, Bo Zhou
BACKGROUND: Rice (Oryza sativa) is one of the most important food crops in the world. Rice blast, caused by the fungal pathogen Magnaporthe oryzae, is one of the most destructive rice diseases worldwide. To effectively cope with this problem, the use of rice blast resistance varieties through innovative breeding programs is the best strategy to date. The Thai rice variety Jao Hom Nin (JHN) showed broad-spectrum resistance against Thai rice blast isolates. Two QTLs for blast resistance in JHN were reported on chromosome 1 (QTL1) and 11 (QTL11)...
December 2017: Rice
https://www.readbyqxmd.com/read/28447321/erratum-to-population-dynamics-among-six-major-groups-of-the-oryza-rufipogon-species-complex-wild-relative-of-cultivated-asian-rice
#13
HyunJung Kim, Janelle Jung, Namrata Singh, Anthony Greenberg, Jeff J Doyle, Wricha Tyagi, Jong-Wook Chung, Jennifer Kimball, Ruaraidh Sackville Hamilton, Susan R McCouch
No abstract text is available yet for this article.
December 2017: Rice
https://www.readbyqxmd.com/read/28444616/genome-wide-identification-of-grain-filling-genes-regulated-by-the-ossmf1-transcription-factor-in-rice
#14
Joung Sug Kim, Songhwa Chae, Kyong Mi Jun, Yoon-Mok Pahk, Tae-Ho Lee, Pil Joong Chung, Yeon-Ki Kim, Baek Hie Nahm
BACKGROUND: Spatial- and temporal-specific expression patterns are primarily regulated at the transcriptional level by gene promoters. Therefore, it is important to identify the binding motifs of transcription factors to better understand the networks associated with embryogenesis. RESULTS: Here, we used a protein-binding microarray (PBM) to identify the binding motifs of OsSMF1, which is a basic leucine zipper transcription factor involved in the regulation of rice seed maturation...
December 2017: Rice
https://www.readbyqxmd.com/read/28429297/identification-of-qtls-for-yield-and-agronomic-traits-in-rice-under-stagnant-flooding-conditions
#15
Anshuman Singh, Jerome Carandang, Zennia Jean C Gonzaga, Bertrand C Y Collard, Abdelbagi M Ismail, Endang M Septiningsih
BACKGROUND: Stagnant flooding, where water of 25-50 cm remains until harvest time, is a major problem in rainfed lowland areas. Most of the Sub1 varieties, which can withstand around 2 weeks of complete submergence, perform poorly in these conditions. Hence, varieties tolerant of stagnant flooding are essential. RESULTS: This paper presents the first study to map QTLs associated with tolerance to stagnant flooding, along with a parallel study under normal irrigation, using an F7 mapping population consisting of 148 RILs derived from a cross of Ciherang-Sub1 and the stagnant-flooding tolerant line IR10F365...
December 2017: Rice
https://www.readbyqxmd.com/read/28429296/diurnal-changes-in-transcript-and-metabolite-levels-during-the-iron-deficiency-response-of-rice
#16
Jamie Selby-Pham, Adrian Lutz, Laura T Moreno-Moyano, Berin A Boughton, Ute Roessner, Alexander A T Johnson
BACKGROUND: Rice (Oryza sativa L.) is highly susceptible to iron (Fe) deficiency due to low secretion levels of the mugineic acid (MA) family phytosiderophore (PS) 2'-deoxymugineic acid (DMA) into the rhizosphere. The low levels of DMA secreted by rice have proved challenging to measure and, therefore, the pattern of DMA secretion under Fe deficiency has been less extensively studied relative to other graminaceous monocot species that secrete high levels of PS, such as barley (Hordeum vulgare L...
December 2017: Rice
https://www.readbyqxmd.com/read/28421550/distribution-genetic-diversity-and-potential-spatiotemporal-scale-of-alien-gene-flow-in-crop-wild-relatives-of-rice-oryza-spp-in-colombia
#17
Evert Thomas, Eduardo Tovar, Carolina Villafañe, José Leonardo Bocanegra, Rodrigo Moreno
BACKGROUND: Crop wild relatives (CWRs) of rice hold important traits that can contribute to enhancing the ability of cultivated rice (Oryza sativa and O. glaberrima) to produce higher yields, cope with the effects of climate change, and resist attacks of pests and diseases, among others. However, the genetic resources of these species remain dramatically understudied, putting at risk their future availability from in situ and ex situ sources. Here we assess the distribution of genetic diversity of the four rice CWRs known to occur in Colombia (O...
December 2017: Rice
https://www.readbyqxmd.com/read/28417425/overexpression-of-oshsp18-0-ci-enhances-resistance-to-bacterial-leaf-streak-in-rice
#18
Yanhu Ju, Hongjuan Tian, Ruihua Zhang, Liping Zuo, Guixiu Jin, Qian Xu, Xinhua Ding, Xiangkui Li, Zhaohui Chu
BACKGROUND: The small heat shock proteins represent a large family of proteins that respond to a wide range of abiotic and biotic stresses. OsHsp18.0-CI confers tolerance to salt and cadmium and interacts with viral RNA-dependent RNA polymerase (RdRp). However, the direct function of OsHsp18.0-CI in resistance against biotic stresses remains unclear in rice. RESULTS: Here, we report that the expression of OsHsp18.0-CI was up-regulated upon inoculation with RS105, a strain of Xanthomonas oryzae pv...
December 2017: Rice
https://www.readbyqxmd.com/read/28409435/aldo-ketoreductase-1-akr1-improves-seed-longevity-in-tobacco-and-rice-by-detoxifying-reactive-cytotoxic-compounds-generated-during-ageing
#19
Nisarga Kodadinne Narayana, Ramu S Vemanna, Babitha Kodekallu Chandrashekar, Hanumantha Rao, Amaranatha Reddy Vennapusa, Ashwini Narasimaha, Udayakumar Makarla, Mohan Raju Basavaiah
BACKGROUND: Maintenance of seed viability is an important factor for seedling vigour and plant establishment. Lipid peroxidation mediated reactive carbonyl compounds (RCC's) and non-enzymatic modifications of proteins through Maillard and Amadori products reduce seed viability and seedling vigour. RESULTS: In this study, the relevance of RCCs on genotypic variation in rice seed viability and overexpression of an aldo-ketoreductase (AKR1) enzyme that detoxify cytotoxic compounds to improve seed viability and vigour was studied...
December 2017: Rice
https://www.readbyqxmd.com/read/28378144/development-and-genetic-characterization-of-a-novel-herbicide-imazethapyr-tolerant-mutant-in-rice-oryza-sativa-l
#20
D Shoba, M Raveendran, S Manonmani, S Utharasu, D Dhivyapriya, G Subhasini, S Ramchandar, R Valarmathi, Nitasha Grover, S Gopala Krishnan, A K Singh, Pawan Jayaswal, Prashant Kale, M K Ramkumar, S V Amitha Mithra, T Mohapatra, Kuldeep Singh, N K Singh, N Sarla, M S Sheshshayee, M K Kar, S Robin, R P Sharma
BACKGROUND: Increased water and labour scarcity in major rice growing areas warrants a shift towards direct seeded rice cultivation under which management of weeds is a major issue. Use of broad spectrum non-selective herbicides is an efficient means to manage weeds. Availability of rice genotypes with complete tolerance against broad-spectrum non-selective herbicides is a pre-requisite for advocating use of such herbicides. In the present study, we developed an EMS induced rice mutant, 'HTM-N22', exhibiting tolerance to a broad spectrum herbicide, 'Imazethapyr', and identified the mutations imparting tolerance to the herbicide...
December 2017: Rice
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