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https://www.readbyqxmd.com/read/27910002/the-rice-pentatricopeptide-repeat-gene-tcd10-is-needed-for-chloroplast-development-under-cold-stress
#1
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
#2
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
#3
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
#4
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
#5
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
https://www.readbyqxmd.com/read/27882529/qtl-mapping-of-grain-quality-traits-using-introgression-lines-carrying-oryza-rufipogon-chromosome-segments-in-japonica-rice
#6
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/27848161/genome-wide-association-mapping-of-cold-tolerance-genes-at-the-seedling-stage-in-rice
#7
Dan Wang, Jinling Liu, Chengang Li, Houxiang Kang, Yue Wang, Xinqiu Tan, Minghao Liu, Yufei Deng, Zhilong Wang, Yong Liu, Deyong Zhang, Yinghui Xiao, Guo-Liang Wang
BACKGROUND: Rice is a temperature-sensitive crop and its production is severely affected by low temperature in temperate and sub-tropical regions. To understand the genetic basis of cold tolerance in rice, we evaluated the cold tolerance at the seedling stage (CTS) of 295 rice cultivars in the rice diversity panel 1 (RDP1), these cultivars were collected from 82 countries. RESULTS: The evaluations revealed that both temperate and tropical japonica rice cultivars are more tolerant to cold stress than indica and AUS cultivars...
December 2016: Rice
https://www.readbyqxmd.com/read/27837430/isolation-and-characterization-of-an-aluminum-resistant-mutant-in-rice
#8
Shuo Liu, Huiling Gao, Xiaoyan Wu, Qiu Fang, Lan Chen, Fang-Jie Zhao, Chao-Feng Huang
BACKGROUND: Aluminum (Al) toxicity represents a major constraint for crop production on acid soils. Rice is a high Al-resistant plant species among small-grain cereals, but its molecular mechanisms of Al resistance are not fully understood. We adopted a forward genetic screen strategy to uncover the Al-resistance mechanisms in rice. In this study, we screened an ethylmethylsulfone (EMS)-mutagenized library to isolate and characterize mutants with altered sensitivity to Al in rice. RESULTS: Treatment of an Al-intolerant indica variety Kasalath with 20 μM Al induced root swelling...
December 2016: Rice
https://www.readbyqxmd.com/read/27830537/association-mapping-of-resistance-to-rice-blast-in-upland-field-conditions
#9
Louis-Marie Raboin, Elsa Ballini, Didier Tharreau, Alain Ramanantsoanirina, Julien Frouin, Brigitte Courtois, Nourollah Ahmadi
BACKGROUND: Rice blast is one of the most damaging disease of rice. The use of resistant cultivars is the only practical way to control the disease in developing countries where most farmers cannot afford fungicides. However resistance often breaks down. Genome wide association studies (GWAS) allow high resolution exploration of rice genetic diversity for quantitative and qualitative resistance alleles that can be combined in breeding programs to achieve durability. We undertook a GWAS of resistance to rice blast using a tropical japonica panel of 150 accessions genotyped with 10,937 markers and an indica panel of 190 accessions genotyped with 14,187 markers...
December 2016: Rice
https://www.readbyqxmd.com/read/27766601/genetic-diversity-and-population-structure-of-rice-varieties-cultivated-in-temperate-regions
#10
Juan L Reig-Valiente, Juan Viruel, Ester Sales, Luis Marqués, Javier Terol, Marta Gut, Sophia Derdak, Manuel Talón, Concha Domingo
BACKGROUND: After its domestication, rice cultivation expanded from tropical regions towards northern latitudes with temperate climate in a progressive process to overcome limiting photoperiod and temperature conditions. This process has originated a wide range of diversity that can be regarded as a valuable resource for crop improvement. In general, current rice breeding programs have to deal with a lack of both germplasm accessions specifically adapted to local agro-environmental conditions and adapted donors carrying desired agronomical traits...
December 2016: Rice
https://www.readbyqxmd.com/read/27757948/rice-chloroplast-genome-variation-architecture-and-phylogenetic-dissection-in-diverse-oryza-species-assessed-by-whole-genome-resequencing
#11
Wei Tong, Tae-Sung Kim, Yong-Jin Park
BACKGROUND: Chloroplast genome variations have been detected, despite its overall conserved structure, which has been valuable for plant population genetics and evolutionary studies. Here, we described chloroplast variation architecture of 383 rice accessions from diverse regions and different ecotypes, in order to mine the rice chloroplast genome variation architecture and phylogenetic. RESULTS: A total of 3677 variations across the chloroplast genome were identified with an average density of 27...
December 2016: Rice
https://www.readbyqxmd.com/read/27730519/population-dynamics-among-six-major-groups-of-the-oryza-rufipogon-species-complex-wild-relative-of-cultivated-asian-rice
#12
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/27730518/molecular-and-bioinformatic-characterization-of-the-rice-root-uv-b-sensitive-gene-family
#13
Ning Yu, Yaping Liang, Xinxiang Peng, Xuewen Hou
BACKGROUND: ROOT UV-B SENSITIVE (RUS) genes exist in most eukaryotic organisms, and encode proteins that contain a DUF647 (domain of unknown function 647). Although the RUS genes are known to play essential roles in Arabidopsis seedling development, their precise functions are not well understood in other plants, including rice. FINDINGS: In this study, six OsRUS genes were cloned from rice root and leaf cDNA libraries. Our analysis showed that the sequence and open reading frame of cloned OsRUS3 cDNA differs from the predictions reported in the RAP-DB and RGAP databases...
December 2016: Rice
https://www.readbyqxmd.com/read/27718133/erratum-to-influence-of-multi-gene-allele-combinations-on-grain-size-of-rice-and-development-of-a-regression-equation-model-to-predict-grain-parameters
#14
Chan-Mi Lee, Jonghwa Park, Backki Kim, Jeonghwan Seo, Gileung Lee, Su Jang, Hee-Jong Koh
No abstract text is available yet for this article.
December 2016: Rice
https://www.readbyqxmd.com/read/27704482/molecular-breeding-of-rice-restorer-lines-and-hybrids-for-brown-planthopper-bph-resistance-using-the-bph14-and-bph15-genes
#15
Hongbo Wang, Shengtuo Ye, Tongmin Mou
BACKGROUND: The development of hybrid rice is a practical approach for increasing rice production. However, the brown planthopper (BPH), Nilaparvata lugens Stål, causes severe yield loss of rice (Oryza sativa L.) and can threaten food security. Therefore, breeding hybrid rice resistant to BPH is the most effective and economical strategy to maintain high and stable production. Fortunately, numerous BPH resistance genes have been identified, and abundant linkage markers are available for molecular marker-assisted selection (MAS) in breeding programs...
December 2016: Rice
https://www.readbyqxmd.com/read/27696287/molecular-dissection-of-seedling-salinity-tolerance-in-rice-oryza-sativa-l-using-a-high-density-gbs-based-snp-linkage-map
#16
Teresa B De Leon, Steven Linscombe, Prasanta K Subudhi
BACKGROUND: Salinity is one of the many abiotic stresses limiting rice production worldwide. Several studies were conducted to identify quantitative trait loci (QTLs) for traits associated to salinity tolerance. However, due to large confidence interval for the position of QTLs, utility of reported QTLs and the associated markers has been limited in rice breeding programs. The main objective of this study is to construct a high-density rice genetic map for identification QTLs and candidate genes for salinity tolerance at seedling stage...
December 2016: Rice
https://www.readbyqxmd.com/read/27681580/transcriptional-regulatory-mechanism-of-alcohol-dehydrogenase-1-deficient-mutant-of-rice-for-cell-survival-under-complete-submergence
#17
Bijayalaxmi Mohanty, Hirokazu Takahashi, Benildo G de Los Reyes, Edward Wijaya, Mikio Nakazono, Dong-Yup Lee
BACKGROUND: Rice is the only crop that germinates and elongates the coleoptile under complete submergence. It has been shown that alcohol dehydrogenase 1 (ADH1)-deficient mutant of rice with reduced alcohol dehydrogenase activity (rad) and reduced ATP level, is viable with much reduced coleoptile elongation under such condition. To understand the altered transcriptional regulatory mechanism of this mutant, we aimed to establish possible relationships between gene expression and cis-regulatory information content...
December 2016: Rice
https://www.readbyqxmd.com/read/27671164/analysis-of-allelic-imbalance-in-rice-hybrids-under-water-stress-and-association-of-asymmetrically-expressed-genes-with-drought-response-qtls
#18
Nelzo C Ereful, Li-Yu Liu, Eric Tsai, Shu-Min Kao, Shalabh Dixit, Ramil Mauleon, Katrina Malabanan, Michael Thomson, Antonio Laurena, David Lee, Ian Mackay, Andy Greenland, Wayne Powell, Hei Leung
BACKGROUND: Information on the effect of stress on the allele-specific expression (ASE) profile of rice hybrids is limited. More so, the association of allelically imbalanced genes to important traits is yet to be understood. Here we assessed allelic imbalance (AI) in the heterozygote state of rice under non- and water-stress treatments and determined association of asymmetrically expressed genes with grain yield (GY) under drought stress by in-silico co-localization analysis and selective genotyping...
December 2016: Rice
https://www.readbyqxmd.com/read/27671163/advances-in-breeding-for-high-grain-zinc-in-rice
#19
REVIEW
B P Mallikarjuna Swamy, Mohammad Akhlasur Rahman, Mary Ann Inabangan-Asilo, Amery Amparado, Christine Manito, Prabhjit Chadha-Mohanty, Russell Reinke, Inez H Slamet-Loedin
Zinc (Zn) is one of the most essential micronutrients required for the growth and development of human beings. More than one billion people, particularly children and pregnant women suffer from Zn deficiency related health problems in Asia. Rice is the major staple food for Asians, but the presently grown popular high yielding rice varieties are poor supplier of Zn in their polished form. Breeding rice varieties with high grain Zn has been suggested to be a sustainable, targeted, food-based and cost effective approach in alleviating Zn deficiency...
December 2016: Rice
https://www.readbyqxmd.com/read/27659284/high-resolution-qtl-mapping-for-grain-appearance-traits-and-co-localization-of-chalkiness-associated-differentially-expressed-candidate-genes-in-rice
#20
Likai Chen, Weiwei Gao, Siping Chen, Liping Wang, Jiyong Zou, Yongzhu Liu, Hui Wang, Zhiqiang Chen, Tao Guo
BACKGROUND: Grain appearance quality is a main determinant of market value in rice and one of the highly important traits requiring improvement in breeding programs. The genetic basis of grain shape and endosperm chalkiness have been given significant attention because of their importance in affecting grain quality. Meanwhile, the introduction of NGS (Next Generation Sequencing) has a significant part to play in the area of genomics, and offers the possibility for high-resolution genetic map construction, population genetics analysis and systematic expression profile study...
December 2016: Rice
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