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https://www.readbyqxmd.com/read/29344835/genetic-evidence-for-the-role-of-a-rice-vacuolar-invertase-as-a-molecular-sink-strength-determinant
#1
Shamitha Rao Morey, Tatsuro Hirose, Yoichi Hashida, Akio Miyao, Hirohiko Hirochika, Ryu Ohsugi, Junko Yamagishi, Naohiro Aoki
BACKGROUND: Rice is a major crop feeding the majority of the global population, and increasing its sink strength is one of the modes to alleviate the declining availability of food for the rapidly growing world population. We demonstrate a role for an important rice vacuolar invertase isoform, OsINV3, in sink strength determination. RESULTS: OsINV3 mutants showed shorter panicles with lighter and smaller grains, owing to a smaller cell size on the outer and inner surfaces of the palea and lemma as observed by scanning electron microscopy...
January 17, 2018: Rice
https://www.readbyqxmd.com/read/29330772/rice-wrky11-plays-a-role-in-pathogen-defense-and-drought-tolerance
#2
Heyoung Lee, Jooyoung Cha, Changhyun Choi, Naeyoung Choi, Hyun-So Ji, Sang Ryeol Park, Seungbum Lee, Duk-Ju Hwang
BACKGROUND: Plants are frequently subjected to abiotic and biotic stresses, and WRKY proteins play a pivotal role in the response to such stress. OsWRKY11 is induced by pathogens, drought, and heat, suggesting a function in biotic and abiotic stress responses. RESULTS: This study identified OsWRKY11, a member of WRKY group IIc. It is a transcriptional activator that localized to the nucleus. Ectopic expression of OsWRKY11 resulted in enhanced resistance to a bacterial pathogen, Xanthomonas oryzae pv...
January 12, 2018: Rice
https://www.readbyqxmd.com/read/29327163/manipulating-the-phytic-acid-content-of-rice-grain-toward-improving-micronutrient-bioavailability
#3
REVIEW
Ishara Perera, Saman Seneweera, Naoki Hirotsu
Myo-inositol hexaphosphate, also known as phytic acid (PA), is the most abundant storage form of phosphorus in seeds. PA acts as a strong chelator of metal cations to form phytate and is considered an anti-nutrient as it reduces the bioavailability of important micronutrients. Although the major nutrient source for more than one-half of the global population, rice is a poor source of essential micronutrients. Therefore, biofortification and reducing the PA content of rice have arisen as new strategies for increasing micronutrient bioavailability in rice...
January 11, 2018: Rice
https://www.readbyqxmd.com/read/29322324/molecular-mapping-of-qbk1-wd-a-major-qtl-for-bakanae-disease-resistance-in-rice
#4
Sais-Beul Lee, Yeon-Jae Hur, Jun-Hyeon Cho, Jong-Hee Lee, Tae-Heon Kim, Soo-Min Cho, You-Chun Song, Young-Su Seo, Jungkwan Lee, Tae-Sung Kim, Yong-Jin Park, Myung-Kyu Oh, Dong-Soo Park
BACKGROUND: Bakanae or foot rot disease is a prominent disease of rice caused by Gibberella fujikuroi. This disease may infect rice plants from the pre-emergence stage to the mature stage. In recent years, raising rice seedlings in seed boxes for mechanical transplanting has increased the incidence of many seedling diseases; only a few rice varieties have been reported to exhibit resistance to bakanae disease. In this study, we attempted to identify quantitative trait loci (QTLs) conferring bakanae disease resistance from the highly resistant japonica variety Wonseadaesoo...
January 10, 2018: Rice
https://www.readbyqxmd.com/read/29313187/allelic-variants-of-ossub1a-cause-differential-expression-of-transcription-factor-genes-in-response-to-submergence-in-rice
#5
Niharika Sharma, Trang Minh Dang, Namrata Singh, Slobodan Ruzicic, Bernd Mueller-Roeber, Ute Baumann, Sigrid Heuer
BACKGROUND: Flooding during seasonal monsoons affects millions of hectares of rice-cultivated areas across Asia. Submerged rice plants die within a week due to lack of oxygen, light and excessive elongation growth to escape the water. Submergence tolerance was first reported in an aus-type rice landrace, FR13A, and the ethylene-responsive transcription factor (TF) gene SUB1A-1 was identified as the major tolerance gene. Intolerant rice varieties generally lack the SUB1A gene but some intermediate tolerant varieties, such as IR64, carry the allelic variant SUB1A-2...
January 8, 2018: Rice
https://www.readbyqxmd.com/read/29305728/the-rice-zebra3-z3-mutation-disrupts-citrate-distribution-and-produces-transverse-dark-green-green-variegation-in-mature-leaves
#6
Suk-Hwan Kim, Choon-Tak Kwon, Giha Song, Hee-Jong Koh, Gynheung An, Nam-Chon Paek
BACKGROUND: Rice zebra mutants are leaf variegation mutants that exhibit transverse sectors of green/yellow or green/white in developing or mature leaves. In most cases, leaf variegation is caused by defects in chloroplast biogenesis pathways, leading to an accumulation of reactive oxygen species in a transverse pattern in the leaves. Here, we examine a new type of leaf variegation mutant in rice, zebra3 (z3), which exhibits transverse dark-green/green sectors in mature leaves and lacks the typical yellow or white sectors...
January 5, 2018: Rice
https://www.readbyqxmd.com/read/29282604/oslap6-ospks1-an-orthologue-of-arabidopsis-pksa-lap6-is-critical-for-proper-pollen-exine-formation
#7
Ting Zou, Qiao Xiao, Wenjie Li, Tao Luo, Guoqiang Yuan, Zhiyuan He, Mingxing Liu, Qiao Li, Peizhou Xu, Jun Zhu, Yueyang Liang, Qiming Deng, Shiquan Wang, Aiping Zheng, Lingxia Wang, Ping Li, Shuangcheng Li
BACKGROUND: Male fertility is crucial for rice yield, and the improvement of rice yield requires hybrid production that depends on male sterile lines. Although recent studies have revealed several important genes in male reproductive development, our understanding of the mechanisms of rice pollen development remains unclear. RESULTS: We identified a rice mutant oslap6 with complete male sterile phenotype caused by defects in pollen exine formation. By using the MutMap method, we found that a single nucleotide polymorphism (SNP) variation located in the second exon of OsLAP6/OsPKS1 was responsible for the mutant phenotype...
December 28, 2017: Rice
https://www.readbyqxmd.com/read/29282566/marker-assisted-pyramiding-of-bph6-and-bph9-into-elite-restorer-line-93-11-and-development-of-functional-marker-for-bph9
#8
Yang Wang, Weihua Jiang, Hongmei Liu, Ya Zeng, Bo Du, Lili Zhu, Guangcun He, Rongzhi Chen
BACKGROUND: The brown planthopper (BPH) has become the most destructive and a serious threat to the rice production in Asia. Breeding the resistant varieties with improved host resistance is the most effective and ecosystem-friendly strategy of BPH biological management. As host resistance was always broken down by the presence of the upgrading BPH biotype, the more resistant varieties with novel resistance genes or pyramiding known identified BPH resistance genes would be needed urgently for higher resistant level and more durability of resistance...
December 28, 2017: Rice
https://www.readbyqxmd.com/read/29282559/characterization-of-the-rice-nla-family-reveals-a-key-role-for-osnla1-in-phosphate-homeostasis
#9
Jian Yang, Lan Wang, Chuanzao Mao, Honghui Lin
BACKGROUND: Phosphate (Pi), an essential mineral nutrient for plant development and reproduction, is one of the main components of fertilizers in modern agriculture. Previous research demonstrated that AtNLA1 mediates ubiquitination of Pi transporters in the plasma membrane and triggers their endocytosis and degradation in Arabidopsis. In this study, we researched the function of NLA homologous proteins in Pi homeostasis in rice. FINDINGS: Two OsNLA homologs from rice (Oryza sativa L...
December 28, 2017: Rice
https://www.readbyqxmd.com/read/29247303/root-cone-angle-is-enlarged-in-docs1-lrr-rlk-mutants-in-rice
#10
M Bettembourg, M Dal-Soglio, C Bureau, A Vernet, A Dardoux, M Portefaix, M Bes, D Meynard, D Mieulet, B Cayrol, C Perin, B Courtois, J F Ma, A Dievart
BACKGROUND: The DEFECTIVE IN OUTER CELL LAYER SPECIFICATION 1 (DOCS1) gene belongs to the Leucine-Rich Repeat Receptor-Like Kinase (LRR-RLK) subfamily. It has been discovered few years ago in Oryza sativa (rice) in a screen to isolate mutants with defects in sensitivity to aluminum. The c68 (docs1-1) mutant possessed a nonsense mutation in the C-terminal part of the DOCS1 kinase domain. FINDINGS: We have generated a new loss-of-function mutation in the DOCS1 gene (docs1-2) using the CRISPR-Cas9 technology...
December 15, 2017: Rice
https://www.readbyqxmd.com/read/29197985/pervasive-interactions-of-sa-and-sb-loci-cause-high-pollen-sterility-and-abrupt-changes-in-gene-expression-during-meiosis-that-could-be-overcome-by-double-neutral-genes-in-autotetraploid-rice
#11
Jinwen Wu, Lin Chen, Muhammad Qasim Shahid, Minyi Chen, Qinglei Dong, Jirui Li, Xiaosong Xu, Xiangdong Liu
BACKGROUND: Intersubspecific autotetraploid rice hybrids possess high hybrid vigor; however, low pollen fertility is a critical hindrance in its commercial utilization. Our previous study demonstrated that polyploidy could increase the multi-loci interaction and cause high pollen abortion in autotetraploid rice hybrids. However, there is little known about the critical role of pollen sterility locus or loci in the intersubspecific hybrids. We developed autotetraploid rice hybrids harboring heterozygous genotypes (S i S i S j S j ) at different pollen sterility loci by using the near isogenic lines of Taichung65-4×...
December 2, 2017: Rice
https://www.readbyqxmd.com/read/28786034/bioinformatics-resources-for-deciphering-the-biogenesis-and-action-pathways-of-plant-small-rnas
#12
REVIEW
Dongliang Yu, Xiaoxia Ma, Ziwei Zuo, Weishan Shao, Huizhong Wang, Yijun Meng
The next-generation sequencing (NGS) technology has revolutionized our previous understanding of the plant genomes, relying on its innate advantages, such as high throughput and deep sequencing depth. In addition to the protein-coding gene loci, massive transcription signals have been detected within intergenic or intragenic regions. Most of these signals belong to non-coding ones, considering their weak protein-coding potential. Generally, these transcripts could be divided into long non-coding RNAs and small non-coding RNAs (sRNAs) based on their sequence length...
December 2017: Rice
https://www.readbyqxmd.com/read/28779340/identification-of-resistant-germplasm-containing-novel-resistance-genes-at-or-tightly-linked-to-the-pi2-9-locus-conferring-broad-spectrum-resistance-against-rice-blast
#13
Gui Xiao, Frances Nikki Borja, Ramil Mauleon, Jonas Padilla, Mary Jeanie Telebanco-Yanoria, Jianxia Yang, Guodong Lu, Maribel Dionisio-Sese, Bo Zhou
BACKGROUND: The rice Pi2/9 locus harbors multiple resistance (R) genes each controlling broad-spectrum resistance against diverse isolates of Magnaporthe oryzae, a fungal pathogen causing devastating blast disease to rice. Identification of more resistance germplasm containing novel R genes at or tightly linked to the Pi2/9 locus would promote breeding of resistance rice cultivars. RESULTS: In this study, we aim to identify resistant germplasm containing novel R genes at or tightly linked to the Pi2/9 locus using a molecular marker, designated as Pi2/9-RH (Pi2/9 resistant haplotype), developed from the 5' portion of the Pi2 sequence which was conserved only in the rice lines containing functional Pi2/9 alleles...
December 2017: Rice
https://www.readbyqxmd.com/read/28766258/panicle-blast-1-pb1-resistance-is-dependent-on-at-least-four-qtls-in-the-rice-genome
#14
Haruhiko Inoue, Mitsuru Nakamura, Tatsumi Mizubayashi, Akira Takahashi, Shoji Sugano, Shuuichi Fukuoka, Nagao Hayashi
BACKGROUND: Rice blast is the most serious disease afflicting rice and there is an urgent need for the use of disease resistance (R) genes in blast tolerance breeding programs. Pb1 is classified as a quantitative resistance gene and it does not have fungal specificity. Pb1-mediated resistance develops in the latter stages of growth. However, some cultivars, such as Kanto209 (K209), cultivar name Satojiman, despite possessing Pb1, do not exert resistance to rice blast during the reproductive stage...
December 2017: Rice
https://www.readbyqxmd.com/read/28730413/updating-the-elite-rice-variety-kongyu-131-by-improving-the-gn1a-locus
#15
Xiaomin Feng, Chen Wang, Jianzong Nan, Xiaohui Zhang, Rongsheng Wang, Guoqiang Jiang, Qingbo Yuan, Shaoyang Lin
BACKGROUND: Kongyu 131 is an elite japonica rice variety of Heilongjiang Province, China. It has the characteristics of early maturity, superior quality, high yield, cold tolerance and wide adaptability. However, there is potential to improve the yield of Kongyu 131 because of the relatively few grains per panicle compared with other varieties. Hence, we rebuilt the genome of Kongyu 131 by replacing the GRAIN NUMBER1a (Gn1a) locus with a high-yielding allele from a big panicle indica rice variety, GKBR...
December 2017: Rice
https://www.readbyqxmd.com/read/28730412/gns4-a-novel-allele-of-dwarf11-regulates-grain-number-and-grain-size-in-a-high-yield-rice-variety
#16
Yong Zhou, Yajun Tao, Jinyan Zhu, Jun Miao, Jun Liu, Yanhua Liu, Chuandeng Yi, Zefeng Yang, Zhiyun Gong, Guohua Liang
BACKGROUND: Rice plays an extremely important role in food safety because it feeds more than half of the world's population. Rice grain yield depends on biomass and the harvest index. An important strategy to break through the rice grain yield ceiling is to increase the biological yield. Therefore, genes associated with organ size are important targets for rice breeding. RESULTS: We characterized a rice mutant gns4 (grain number and size on chromosome 4) with reduced organ size, fewer grains per panicle, and smaller grains compared with those of WT...
December 2017: Rice
https://www.readbyqxmd.com/read/28730411/sugary-endosperm-is-modulated-by-starch-branching-enzyme-iia-in-rice-oryza-sativa-l
#17
Yunjoo Lee, Min-Seon Choi, Gileung Lee, Su Jang, Mi-Ra Yoon, Backki Kim, Rihua Piao, Mi-Ok Woo, Joong Hyoun Chin, Hee-Jong Koh
BACKGROUND: Starch biosynthesis is one of the most important pathways that determine both grain quality and yield in rice (Oryza sativa L.). Sugary endosperm, sugary-1 (sug-1), is a mutant trait for starch biosynthesis. Rice plants carrying sug-1 produce grains that accumulate water-soluble carbohydrates instead of starch, even after maturity. Although this trait enhances the diversity of grain quality, sugary endosperm rice has hardly been commercialized due to the severely wrinkled grains and subsequent problems in milling...
December 2017: Rice
https://www.readbyqxmd.com/read/28710696/mesocotyl-elongation-is-essential-for-seedling-emergence-under-deep-seeding-condition-in-rice
#18
Hyun-Sook Lee, Kazuhiro Sasaki, Ju-Won Kang, Tadashi Sato, Won-Yong Song, Sang-Nag Ahn
BACKGROUND: Direct-seeding cultivation by deep-seeding of seeds (drill seeding) is becoming popular due to the scarcity of land and labor. However, poor emergence and inadequate seedling establishment can lead to yield loss in direct-seeding cultivation by deep-sowing. In rice, mesocotyl and coleoptile are primarily responsible for seedling emergence from deeper levels of soil. RESULTS: Quantitative trait loci (QTLs) for mesocotyl and coleoptile length at 5-cm seeding depth were detected using 98 backcross inbred lines from a cross between Kasalath and Nipponbare...
December 2017: Rice
https://www.readbyqxmd.com/read/28664529/phenology-sterility-and-inheritance-of-two-environment-genic-male-sterile-egms-lines-for-hybrid-rice
#19
R El-Namaky, P A J van Oort
BACKGROUND: There is still limited quantitative understanding of how environmental factors affect sterility of Environment-conditioned genic male sterility (EGMS) lines. A model was developed for this purpose and tested based on experimental data from Ndiaye (Senegal) in 2013-2015. For the two EGMS lines tested here, it was not clear if one or more recessive gene(s) were causing male sterility. This was tested by studying sterility segregation of the F2 populations. RESULTS: Daylength (photoperiod) and minimum temperatures during the period from panicle initiation to flowering had significant effects on male sterility...
December 2017: Rice
https://www.readbyqxmd.com/read/28647924/comparative-expression-analysis-of-rice-and-arabidopsis-peroxiredoxin-genes-suggests-conserved-or-diversified-roles-between-the-two-species-and-leads-to-the-identification-of-tandemly-duplicated-rice-peroxiredoxin-genes-differentially-expressed-in-seeds
#20
Yun-Shil Gho, Sun-A Park, Sung-Ruyl Kim, Anil Kumar Nalini Chandran, Gynheung An, Ki-Hong Jung
BACKGROUND: Peroxiredoxins (PRXs) have recently been identified as plant antioxidants. Completion of various genome sequencing projects has provided genome-wide information about PRX genes in major plant species. Two of these -- Oryza sativa (rice) and Arabidopsis -- each have 10 PRX members. Although significant progress has been made in understanding their biological roles in Arabidopsis, those functions in rice, a model crop plant, have not been well studied. RESULTS: We performed a comparative expression analysis of rice and Arabidopsis PRXs...
December 2017: Rice
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