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https://www.readbyqxmd.com/read/28429297/identification-of-qtls-for-yield-and-agronomic-traits-in-rice-under-stagnant-flooding-conditions
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
https://www.readbyqxmd.com/read/28353179/genotypic-and-environmental-variations-in-grain-cadmium-and-arsenic-concentrations-among-a-panel-of-high-yielding-rice-cultivars
#7
Guilan Duan, Guosheng Shao, Zhong Tang, Hongping Chen, Boxun Wang, Zhu Tang, Yuping Yang, Yuechuan Liu, Fang-Jie Zhao
BACKGROUND: Rice is a major dietary source of cadmium (Cd) and arsenic (As) for populations consuming rice as the staple food. Excessive Cd and As accumulation in rice grain is of great concern worldwide, especially in South China where soil contamination with heavy metals and metalloids is widespread. It is important to reduce Cd and As accumulation in rice grain through selection and breeding of cultivars accumulating low levels of Cd or As. RESULTS: To assess the genetic and environmental variations in the concentrations of Cd and As in rice grains, 471 locally adapted high-yielding rice cultivars were grown at three moderately contaminated sites in South China for two years...
December 2017: Rice
https://www.readbyqxmd.com/read/28321828/genome-wide-association-analysis-tracks-bacterial-leaf-blight-resistance-loci-in-rice-diverse-germplasm
#8
Christine Jade Dilla-Ermita, Erwin Tandayu, Venice Margarette Juanillas, Jeffrey Detras, Dennis Nicuh Lozada, Maria Stefanie Dwiyanti, Casiana Vera Cruz, Edwige Gaby Nkouaya Mbanjo, Edna Ardales, Maria Genaleen Diaz, Merlyn Mendioro, Michael J Thomson, Tobias Kretzschmar
BACKGROUND: A range of resistance loci against different races of Xanthomonas oryzae pv. oryzae (Xoo), the pathogen causing bacterial blight (BB) disease of rice, have been discovered and characterized. Several have been deployed in modern varieties, however, due to rapid evolution of Xoo, a number have already become ineffective. The continuous "arms race" between Xoo and rice makes it imperative to discover new resistance loci to enable durable deployment of multiple resistance genes in modern breeding lines...
December 2017: Rice
https://www.readbyqxmd.com/read/28243987/differential-regulation-of-starch-synthetic-gene-expression-in-endosperm-between-indica-and-japonica-rice-cultivars
#9
Tsuyoshi Inukai
BACKGROUND: Grain filling rates (GFRs) of indica rice cultivars are often higher than those of japonica cultivars. Although GFR is mainly determined by the starch accumulation rate (SAR) in endosperm, the genetic basis for SAR during the ripening period has not been well studied in rice. To elucidate the factors influencing the differing SARs between typical indica and japonica cultivars, we focused on differences in sink potentials, especially on starch synthesis in the endosperm. RESULTS: SAR in indica rice cultivar IR36 was significantly higher than in japonica cultivar T65...
December 2017: Rice
https://www.readbyqxmd.com/read/28220451/osrlck-57-osrlck107-and-osrlck118-positively-regulate-chitin-and-pgn-induced-immunity-in-rice
#10
Zhangqun Li, Ying Ao, Dongru Feng, Jun Liu, Jinfa Wang, Hong-Bin Wang, Bing Liu
BACKGROUND: The receptor-like cytoplasmic kinase, OsRLCK176 has been reported to participate in both chitin- and PGN-induced immunity in rice. Here, we further researched the function of the homologous proteins, OsRLCK57, OsRLCK107 and OsRLCK118, in chitin- and PGN immunity in rice. FINDINGS: Silencing of OsRLCK57,OsRLCK107 and OsRLCK118 suppressed chitin- and PGN-induced immunity responses, including reactive oxygen species generation, defense gene expression. Furthermore, OsRLCK107 could interact with OsCERK1 in a MAMP induced way, which suggested a possible physiological relevance of OsRLCKs107 to OsCERK1 pathway...
December 2017: Rice
https://www.readbyqxmd.com/read/28205154/the-nup98-homolog-apip12-targeted-by-the-effector-avrpiz-t-is-involved-in-rice-basal-resistance-against-magnaporthe-oryzae
#11
Mingzhi Tang, Yuese Ning, Xiaoli Shu, Bo Dong, Hongyan Zhang, Dianxing Wu, Hua Wang, Guo-Liang Wang, Bo Zhou
BACKGROUND: The effector AvrPiz-t of Magnaporthe oryzae has virulence function in rice. However, the mechanism underlying its virulence in host is not fully understood. RESULTS: In this study, we analyzed the function of AvrPiz-t interacting protein 12 (APIP12) in rice immunity. APIP12 significantly bound to AvrPiz-t and APIP6 in its middle portion and N-terminus, respectively, in yeast two-hybrid assay. Glutathione S-transferase (GST) pull-down assay further verified the interactions of APIP12 with AvrPiz-t and APIP6...
December 2017: Rice
https://www.readbyqxmd.com/read/28176282/evolutionary-analysis-of-the-sub1-locus-across-the-oryza-genomes
#12
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/28124210/a-temporal-and-spatial-contribution-of-asparaginase-to-asparagine-catabolism-during-development-of-rice-grains
#13
Yui Yabuki, Miwa Ohashi, Fumi Imagawa, Keiki Ishiyama, Marcel Pascal Beier, Noriyuki Konishi, Toshiko Umetsu-Ohashi, Toshihiko Hayakawa, Tomoyuki Yamaya, Soichi Kojima
BACKGROUND: Asparagine is one of the most dominant organic nitrogen compounds in phloem and xylem sap in a wide range of plant species. Asparaginase (ASNase; EC, 3.5.1.1) catabolizes asparagine into aspartate and ammonium; therefore, it is suggested to play a key role in asparagine metabolism within legume sink organs. However, the metabolic fate of asparagine in source and sink organs during rice seed production remains to be elucidated. Therefore, the main objective of this study is to investigate the asparagine metabolism in a temporal and spatial manner during rice seed production...
December 2017: Rice
https://www.readbyqxmd.com/read/28110460/ability-of-rf5-and-rf6-to-restore-fertility-of-chinsurah-boro-ii-type-cytoplasmic-male-sterile-oryza-sativa-ssp-japonica-lines
#14
Honggen Zhang, Jianlan Che, Yongshen Ge, Yan Pei, Lijia Zhang, Qiaoquan Liu, Minghong Gu, Shuzhu Tang
BACKGROUND: Three-line Oryza sativa (ssp. japonica) hybrids have been developed mainly using Chinsurah Boro II (BT)-type cytoplasmic male sterility (CMS). The Rf1 gene restores the fertility of BT-type CMS lines, and is the only fertility restorer gene (Rf) that has been used to produce three-line japonica hybrids. Using more Rf genes to breed BT-type restorer lines may broaden the genetic diversity of the restorer lines, and represents a viable approach to improve the heterosis level of BT-type japonica hybrids...
December 2017: Rice
https://www.readbyqxmd.com/read/28078486/two-nadph-protochlorophyllide-oxidoreductase-por-isoforms-play-distinct-roles-in-environmental-adaptation-in-rice
#15
Choon-Tak Kwon, Suk-Hwan Kim, Giha Song, Dami Kim, Nam-Chon Paek
BACKGROUND: NADPH: protochlorophyllide oxidoreductase (POR) is an essential enzyme that catalyzes the photoreduction of protochlorophyllide to chlorophyllide, which is ultimately converted to chlorophyll in developing leaves. Rice has two POR isoforms, OsPORA and OsPORB. OsPORA is expressed in the dark during early leaf development; OsPORB is expressed throughout leaf development regardless of light conditions. The faded green leaf (fgl) is a loss-of-function osporB mutant that displays necrotic lesions and variegation in the leaves due to destabilized grana thylakoids, and has increased numbers of plastoglobules in the chloroplasts...
December 2017: Rice
https://www.readbyqxmd.com/read/27910002/the-rice-pentatricopeptide-repeat-gene-tcd10-is-needed-for-chloroplast-development-under-cold-stress
#16
Lanlan Wu, Jun Wu, Yanxia Liu, Xiaodi Gong, Jianlong Xu, Dongzhi Lin, Yanjun Dong
BACKGROUND: Chloroplast plays a vital role in plant development and growth. The pentatricopeptide repeat (PPR) gene family is one of the largest gene families in plants. In addition, cold stress affects a broad spectrum of cellular components, e.g. chloroplast, and metabolism in plants. However, the regulatory mechanism for rice PPR genes on chloroplast development still remains elusive under cold stress. RESULT: In this paper, we characterized a new rice PPR gene mutant tcd10 (thermo-sensitive chlorophyll-deficient mutant 10) that exhibits the albino phenotype, malformed chloroplast and could not survive after the 5-leaf stage when grown at 20 °C, but does the normal phenotype at 32 °C...
December 2016: Rice
https://www.readbyqxmd.com/read/27905090/marker-assisted-breeding-of-the-rice-restorer-line-wanhui-6725-for-disease-resistance-submergence-tolerance-and-aromatic-fragrance
#17
Yanchang Luo, Tingchen Ma, Aifang Zhang, Kar Hui Ong, Zefu Li, Jianbo Yang, Zhongchao Yin
BACKGROUND: Rice is a staple food crop in the world. With the increase in world population and economic development, farmers need to produce more rice in limited field. However, the rice production is frequently affected by biotic and abiotic stresses. The use of natural disease resistance and stress tolerance through genetic breeding is the most efficient and economical way to combat or acclimate to these stresses. In addition, rice with aromatic fragrance can significantly increase market value for its good grain quality...
December 2016: Rice
https://www.readbyqxmd.com/read/27900724/suppression-of-osvpe3-enhances-salt-tolerance-by-attenuating-vacuole-rupture-during-programmed-cell-death-and-affects-stomata-development-in-rice
#18
Wenyun Lu, Minjuan Deng, Fu Guo, Mingqiang Wang, Zhanghui Zeng, Ning Han, Yinong Yang, Muyuan Zhu, Hongwu Bian
BACKGROUND: Vacuolar processing enzymes (VPEs) are cysteine proteinases that act as crucial mediators of programmed cell death (PCD) in plants. In rice, however, the role of VPEs in abiotic stress-induced PCD remains largely unknown. In this study, we generated OsVPE3 overexpression and suppression transgenic lines to elucidate the function of this gene in rice. RESULTS: Survival rate and chlorophyll retention analyses showed that suppression of OsVPE3 clearly enhanced salt stress tolerance in transgenic rice compared with wild type...
December 2016: Rice
https://www.readbyqxmd.com/read/27900723/small-grain-11-controls-grain-size-grain-number-and-grain-yield-in-rice
#19
Na Fang, Ran Xu, Luojiang Huang, Baolan Zhang, Penggen Duan, Na Li, Yuehua Luo, Yunhai Li
BACKGROUND: Grain size is one of key agronomic traits that determine grain yield in rice. Several regulators of grain size have been identified in rice, but the mechanisms that determine grain size and yield remain largely unknown. RESULTS: Here we characterize a small grain (smg11) mutant in rice, which exhibits small grains, dense panicles and the increased number of grains per panicle. Cloning and sequence analyses of the SMG11 gene reveal that smg11 is a new allele of DWARF2 (D2), which encodes a cytochrome P450 (CYP90D2) involved in brassinosteroid biosynthetic pathway...
December 2016: Rice
https://www.readbyqxmd.com/read/27888467/oswrky80-oswrky4-module-as-a-positive-regulatory-circuit-in-rice-resistance-against-rhizoctonia-solani
#20
Xixu Peng, Haihua Wang, Jyan-Chyun Jang, Ting Xiao, Huanhuan He, Dan Jiang, Xinke Tang
BACKGROUND: Plant WRKY transcription factors play pivotal roles in diverse biological processes but most notably in plant defense response to pathogens. Sheath blight represents one of the predominant diseases in rice. However, our knowledge about the functions of WRKY proteins in rice defense against sheath blight is rather limited. RESULTS: Here we demonstrate that the expression of Oryza sativa WRKY80 gene (OsWRKY80) is rapidly and strongly induced upon infection of Rhizoctonia solani, the causal agent of rice sheath blight disease...
December 2016: Rice
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