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hybrid sterility

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https://www.readbyqxmd.com/read/28098850/a-rare-exception-to-haldane-s-rule-are-x-chromosomes-key-to-hybrid-incompatibilities
#1
P A Moran, M G Ritchie, N W Bailey
The prevalence of Haldane's rule suggests that sex chromosomes commonly have a key role in reproductive barriers and speciation. However, the majority of research on Haldane's rule has been conducted in species with conventional sex determination systems (XY and ZW) and exceptions to the rule have been understudied. Here we test the role of X-linked incompatibilities in a rare exception to Haldane's rule for female sterility in field cricket sister species (Teleogryllus oceanicus and T. commodus). Both have an XO sex determination system...
January 18, 2017: Heredity
https://www.readbyqxmd.com/read/28071676/transcriptome-analysis-of-neo-tetraploid-rice-reveals-specific-differential-gene-expressions-associated-with-fertility-and-heterosis
#2
Haibin Guo, Jean Nestor Mendrikahy, Lei Xie, Junfeng Deng, Zijun Lu, Jinwen Wu, Xiang Li, Muhammad Qasim Shahid, Xiangdong Liu
Polyploid rice hybrids have a powerful biological and yield potential that may become a new way for rice breeding; however, low fertility is major hindrance in commercial utilization. Here, we developed a neo-tetraploid rice that could overcome the sterility of autotetraploid rice and produce high heterosis. Transcriptome analysis of F1 hybrid developed by crossing neo-tetraploid with autotetraploid rice displayed 807, 663 and 866 differentially expressed genes that uniquely associated with F1 and specific to (DEGFu-sp) anther, ovary and leaf, respectively...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28064190/cytoplasmic-nuclear-incompatibility-between-wild-isolates-of-caenorhabditis-nouraguensis
#3
Piero Lamelza, Michael Ailion
How species arise is a fundamental question in biology. Species can be defined as populations of interbreeding individuals that are reproductively isolated from other such populations. Therefore, understanding how reproductive barriers evolve between populations is essential for understanding the process of speciation. Hybrid incompatibility (for example, hybrid sterility or lethality) is a common and strong reproductive barrier in nature. Here we report a lethal incompatibility between two wild isolates of the nematode Caenorhabditis nouraguensis Hybrid inviability results from the incompatibility between a maternally inherited cytoplasmic factor from each strain and a recessive nuclear locus from the other...
January 6, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28056223/arthrobacter-halophytocola-sp-nov-a-novel-endophytic-actinomycete-isolated-from-the-roots-of-a-coastal-halophyte-limonium-sinense
#4
Wei-Wei Feng, Tian-Tian Wang, Juan-Luan Bai, Peng Ding, Ke Xing, Ji-Hong Jiang, Xue Peng, Sheng Qin
A novel actinobacterium designated KLBMP 5180T, was isolated from the surface-sterilized root of a coastal halophyte Limonium sinense collected from the city of Lianyungang, Jiangsu Province, east of China. The isolate was Gram-stain-positive, aerobic and non-motile. The components of cell-wall peptidoglycan were lysine, glutamic acid and alanine. The predominant menaquinone was MK-9 (70%). The polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and one unknown phospholipid...
January 5, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28055137/a-single-point-mutation-in-ms44-results-in-dominant-male-sterility-and-improves-nitrogen-use-efficiency-in-maize
#5
Tim Fox, Jason DeBruin, Kristin Haug Collet, Mary Trimnell, Joshua Clapp, April Leonard, Bailin Li, Eric Scolaro, Sarah Collinson, Kimberly Glassman, Michael Miller, Jeff Schussler, Dennis Dolan, Lu Liu, Carla Gho, Marc Albertsen, Dale Loussaert, Bo Shen
Application of nitrogen fertilizer in the past 50 years has resulted in significant increases in crop yields. However, loss of nitrogen from crop fields has been associated with negative impacts on the environment. Developing maize hybrids with improved nitrogen use efficiency is a cost-effective strategy for increasing yield sustainably. We report that a dominant male sterile mutant Ms44 encodes a lipid transfer protein which is expressed specifically in the tapetum. A single amino acid change from alanine to threonine at the signal peptide cleavage site of the Ms44 protein abolished protein processing and impeded the secretion of protein from tapetal cells into the locule, resulting in dominant male sterility...
January 5, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28052078/morphological-characterization-of-a-new-and-easily-recognizable-nuclear-male-sterile-mutant-of-sorghum-sorghum-bicolor
#6
Zhanguo Xin, Jian Huang, Ashley R Smith, Junping Chen, John Burke, Scott E Sattler, Dazhong Zhao
Sorghum (Sorghum bicolor L. Moench) is one of the most important grain crops in the world. The nuclear male sterility (NMS) trait, which is caused by mutations on the nuclear gene, is valuable for hybrid breeding and genetic studies. Several NMS mutants have been reported previously, but none of them were well characterized. Here, we present our detailed morphological characterization of a new and easily recognizable NMS sorghum mutant male sterile 8 (ms8) isolated from an elite inbred BTx623 mutagenized by ethyl methane sulfonate (EMS)...
2017: PloS One
https://www.readbyqxmd.com/read/28028235/correction-for-chang-et-al-construction-of-a-male-sterility-system-for-hybrid-rice-breeding-and-seed-production-using-a-nuclear-male-sterility-gene
#7
(no author information available yet)
No abstract text is available yet for this article.
January 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28025977/origins-of-rice-cytoplasmic-male-sterility-genes
#8
Deborah Charlesworth
Cytoplasmic male sterility (CMS) factors have long been known in some wild plants, and also in some domesticated species, where they are used to produce plants to be used as maternal parents, for example to breed hybrids that display hybrid vigor. Their origins have been mystifying, and now a study recently published in Cell Research helps understand how one widely-used rice CMS factor evolved.
January 2017: Cell Research
https://www.readbyqxmd.com/read/28005570/in-vitro-microbiological-analysis-of-bacterial-seal-in-hybrid-zirconia-abutment-tapered-connection
#9
Maurício Marcelo Harlos, Thiago Bezerra da Silva, Daiane C Peruzzo, Marcelo H Napimoga, Julio Cesar Joly, Elizabeth F Martinez
PURPOSE: The aim of this study was to evaluate the bacterial seal at the implant-hybrid zirconia abutment interface and Morse taper-type connections through in vitro microbiological analysis. MATERIALS AND METHODS: Sixteen implants and their respective abutments were divided into 3 groups: test (10 sets), positive control (3 sets), and negative control (3 sets). In the test group, 10 implants were contaminated with Escherichia coli using a sterile inoculating loop to the inner portion of the implants, followed by torque application to the abutment (30 N·cm)...
December 21, 2016: Implant Dentistry
https://www.readbyqxmd.com/read/28004842/puzzles-in-modern-biology-i-male-sterility-failure-reveals-design
#10
Steven A Frank
Many human males produce dysfunctional sperm. Various plants frequently abort pollen. Hybrid matings often produce sterile males. Widespread male sterility is puzzling. Natural selection prunes reproductive failure. Puzzling failure implies something that we do not understand about how organisms are designed. Solving the puzzle reveals the hidden processes of design.
2016: F1000Research
https://www.readbyqxmd.com/read/27999987/mapping-and-application-of-the-twin-grain1-gene-in-rice
#11
Shenghai Ye, Weibing Yang, Rongrong Zhai, Yanting Lu, Junmei Wang, Xiaoming Zhang
The map-based cloning and application of a flower organ number gene twin - grain1 provide great potential for improving seed production in hybrid rice. A new germplasm for high-yield rice breeding, the twin-grain1 (tg1) mutant with more than one grain in a glume, was obtained from the Zhejing 22 rice variety via physical mutagenesis. The mapping results showed that TG1 is allelic to FLORAL ORGAN NUMBER2 (FON2)/FLORAL ORGAN NUMBER4 (FON4), a flower organ number gene located at 88.7 cM on chromosome 11. The novel tg1 gene allele was introgressed into the cytoplasmic male sterility (CMS) line Zhejing 22A, giving rise to a new CMS line Zhejing 22-tg1A...
December 20, 2016: Planta
https://www.readbyqxmd.com/read/27999113/the-composite-regulatory-basis-of-the-large-x-effect-in-mouse-speciation
#12
Erica L Larson, Sara Keeble, Dan Vanderpool, Matthew D Dean, Jeffrey M Good
The disruption of meiotic sex chromosome inactivation (MSCI) has been proposed to be a major developmental mechanism underlying the rapid evolution of hybrid male sterility. We tested this idea by analyzing cell-specific gene expression across spermatogenesis in two lineages of house mice and their sterile and fertile reciprocal hybrids. We found pervasive disruption of sex chromosome gene expression in sterile hybrids at every stage of spermatogenesis. Failure of MSCI was developmentally preceded by increased silencing of autosomal genes, supporting the hypothesis that divergence at the hybrid incompatibility gene, Prdm9, results in increased rates of autosomal asynapsis which in turn triggers widespread silencing of unsynapsed chromatin...
December 20, 2016: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/27998034/regulation-of-gene-expression-by-manipulating-transcriptional-repressor-activity-using-a-novel-cosri-technology
#13
Yue Xu, Song Feng Li, Roger W Parish
Targeted gene manipulation is a central strategy for studying gene function and identifying related biological processes. However, a methodology for manipulating the regulatory motifs of transcription factors is lacking as these factors commonly possess multiple motifs (eg. repression and activation motifs) which collaborate with each other to regulate multiple biological processes. We describe a novel approach designated Conserved Sequence-guided Repressor Inhibition (CoSRI) that can specifically reduce or abolish the repressive activities of transcription factors in vivo...
December 20, 2016: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/27996080/digest-on-the-temporal-evolution-of-reproductive-isolation1
#14
Spencer Ingley
Speciation research has long focused on understanding how reproductive barriers-sometimes referred to as the "currency" of speciation-contribute to genetic isolation between divergent lineages (Coyne and Orr 2004). These reproductive barriers include those that occur before mating takes place (e.g., sexual, habitat, and temporal isolation) and after (e.g., gametic incompatibility, hybrid sterility, and sexual/ecological selection against hybrids). Given that the speciation process is typically too long to observe in its entirety, researchers often approach the problem of understanding how barriers evolve by studying barriers between taxa at different stages of divergence...
December 20, 2016: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/27973589/cryptic-species-due-to-hybridization-a-combined-approach-to-describe-a-new-species-carex-cyperaceae
#15
Enrique Maguilla, Marcial Escudero
Disappearance of diagnostic morphological characters due to hybridization is considered to be one of the causes of the complex taxonomy of the species-rich (ca. 2000 described species) genus Carex (Cyperaceae). Carex furva s.l. belongs to section Glareosae. It is an endemic species from the high mountains of the Iberian Peninsula (Spain and Portugal). Previous studies suggested the existence of two different, cryptic taxa within C. furva s.l. Intermediate morphologies found in the southern Iberian Peninsula precluded the description of a new taxa...
2016: PloS One
https://www.readbyqxmd.com/read/27965387/pms1t-producing-phased-small-interfering-rnas-regulates-photoperiod-sensitive-male-sterility-in-rice
#16
Yourong Fan, Jiangyi Yang, Sandra M Mathioni, Jinsheng Yu, Jianqiang Shen, Xuefei Yang, Lei Wang, Qinghua Zhang, Zhaoxia Cai, Caiguo Xu, Xianghua Li, Jinghua Xiao, Blake C Meyers, Qifa Zhang
Phased small-interfering RNAs (phasiRNAs) are a special class of small RNAs, which are generated in 21- or 24-nt intervals from transcripts of precursor RNAs. Although phasiRNAs have been found in a range of organisms, their biological functions in plants have yet to be uncovered. Here we show that phasiRNAs generated by the photopheriod-sensetive genic male sterility 1 (Pms1) locus were associated with photoperiod-sensitive male sterility (PSMS) in rice, a germplasm that started the two-line hybrid rice breeding...
December 27, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27936041/recreating-stable-brachypodium-hybridum-allotetraploids-by-uniting-the-divergent-genomes-of-b-distachyon-and-b-stacei
#17
Vinh Ha Dinh Thi, Olivier Coriton, Isabelle Le Clainche, Dominique Arnaud, Sean P Gordon, Gabriella Linc, Pilar Catalan, Robert Hasterok, John P Vogel, Joseph Jahier, Boulos Chalhoub
Brachypodium hybridum (2n = 30) is a natural allopolyploid with highly divergent sub-genomes derived from two extant diploid species, B. distachyon (2n = 10) and B. stacei (2n = 20) that differ in chromosome evolution and number. We created synthetic B. hybridum allotetraploids by hybridizing various lines of B. distachyon and B. stacei. The initial amphihaploid F1 interspecific hybrids were obtained at low frequencies when B. distachyon was used as the maternal parent (0.15% or 0.245% depending on the line used) and were sterile...
2016: PloS One
https://www.readbyqxmd.com/read/27931257/oral-microflora-in-preschool-children-attending-a-fluoride-varnish-program-a-cross-sectional-study
#18
Maria Anderson, Margaret Grindefjord, Göran Dahllöf, Gunnar Dahlén, Svante Twetman
BACKGROUND: To compare the oral microflora in preschool children attending a fluoride varnish program with a reference group receiving a standard oral health program without fluoride varnish applications. A second aim was to relate the microbial composition to the caries prevalence. METHODS: Five hundred seven 3-year-old children were enrolled from a cohort of 3403 preschool children taking part in a community based oral health project. Two hundred sixty-three of them had attended caries-preventive program with semi-annual applications of a fluoride varnish since the age of 1 year (test group) while 237 had received standard preventive care (reference group)...
December 8, 2016: BMC Oral Health
https://www.readbyqxmd.com/read/27905141/first-case-of-sterility-associated-with-sex-chromosomal-abnormalities-in-a-jenny
#19
J Dorado, G Anaya, M Bugno-Poniewierska, A Molina, A Mendez-Sanchez, I Ortiz, M Moreno-Millán, M Hidalgo, P Peral García, S Demyda-Peyrás
Chromosomal abnormalities are one of the main causes of genetic infertility in horses. Currently, their detection rate is rising due to the use of new diagnostic tools employing molecular markers linked to the sex chromosome pair. Despite genetic similarities, there are no previous reports of sterility associated with chromosomal abnormalities in the domestic donkey (Equus asinus). Hereby, we determined the presence of a chromosomal mosaicism in a female donkey with reproductive problems using molecular methodologies developed for horses...
December 1, 2016: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/27904810/a-preliminary-identification-of-rf-a619-a-novel-restorer-gene-for-cms-c-in-maize-zea-mays-l
#20
Liu Yongming, Zhao Zhuofan, Lu Yanli, Li Chuan, Wang Jing, Dong Boxiao, Liang Bing, Qiu Tao, Zeng Wenbing, Cao Moju
C-type cytoplasmic male sterility (CMS-C) is widely utilized for hybrid maize seed production. However, genetic mechanisms underlying the fertility restoration are very complicated. At present, there is a divergence on the number of fertility restorer genes in maize inbred line A619 for CMS-C. To further elucidate the restoring mechanism of A619, we used genetic analysis and molecular markers to confirm the restorer genes of maize inbred line A619 for C-type male sterile line C48-2 in this study. Firstly, the fertility segregations of (C48-2 × A619)F2 populations were investigated under three environments during 2013-2015...
2016: PeerJ
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