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hybrid sterility

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https://www.readbyqxmd.com/read/28209763/revisiting-suppression-of-interspecies-hybrid-male-lethality-in-caenorhabditis-nematodes
#1
Lauren E Ryan, Eric S Haag
Within the nematode genus Caenorhabditis, C. briggsae and C. nigoni are among the most closely related species known. They differ in sexual mode, with C. nigoni retaining the ancestral XO male-XX female outcrossing system, while C. briggsae recently evolved self-fertility and an XX-biased sex ratio. Wild-type C. briggsae and C. nigoni can produce fertile hybrid XX female progeny, but XO progeny are either 100% inviable (when C. briggsae is the mother) or viable but sterile (when C. nigoni is the mother). A recent study provided evidence suggesting that loss of the Cbr-him-8 meiotic regulator in C...
February 16, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28178307/transcriptional-regulation-of-male-sterility-in-7b-1-male-sterile-tomato-mutant
#2
Vahid Omidvar, Irina Mohorianu, Tamas Dalmay, Yi Zheng, Zhangjun Fei, Anna Pucci, Andrea Mazzucato, Vendula Večeřová, Michaela Sedlářova, Martin Fellner
The 7B-1 tomato (Solanum lycopersicum L. cv Rutgers) is a male-sterile mutant with enhanced tolerance to abiotic stress, which makes it a potential candidate for hybrid seed breeding and stress engineering. To underline the molecular mechanism regulating the male-sterility in 7B-1, transcriptomic profiles of the 7B-1 male-sterile and wild type (WT) anthers were studied using mRNA sequencing (RNA-Seq). In total, 768 differentially expressed genes (DEGs) were identified, including 132 up-regulated and 636 down-regulated transcripts...
2017: PloS One
https://www.readbyqxmd.com/read/28168103/in-situ-morphometric-survey-elucidates-the-evolutionary-systematics-of-the-eurasian-himantoglossum-clade-orchidaceae-orchidinae
#3
Richard M Bateman, Attila Molnár V, Gábor Sramkó
BACKGROUND AND AIMS: The charismatic Himantoglossum s.l. clade of Eurasian orchids contains an unusually large proportion of taxa that are of controversial circumscriptions and considerable conservation concern. Whereas our previously published study addressed the molecular phylogenetics and phylogeography of every named taxon within the clade, here we use detailed morphometric data obtained from the same populations to compare genotypes with associated phenotypes, in order to better explore taxonomic circumscription and character evolution within the clade...
2017: PeerJ
https://www.readbyqxmd.com/read/28163593/development-of-a-platform-for-breeding-by-design-of-cms-restorer-lines-based-on-an-sssl-library-in-rice-oryza-sativa-l
#4
Ziju Dai, Qing Lu, Xin Luan, Lian Ouyang, Jie Guo, Jiayan Liang, Haitao Zhu, Wenjuan Wang, Shaokui Wang, Ruizhen Zeng, Ziqiang Liu, Zemin Zhang, Xiaoyuan Zhu, Guiquan Zhang
Exploitation of the heterosis of hybrid rice has shown great success in the improvement of rice yields. However, few genotypes exhibit strong restoration ability as effective restorers of cytoplasmic male sterility (CMS) in the development of hybrid rice. In this study, we developed a platform for the breeding by design of CMS restorer lines based on a library of chromosomal single segment substitution lines (SSSLs) in the Huajingxian74 (HJX74) genetic background. The target genes for breeding by design, Rf3(4) and Rf4(4), which are associated with a strong restoration ability, and gs3, gw8, Wx(g1) and Alk, which are associated with good grain quality, were selected from the HJX74 SSSL library...
December 2016: Breeding Science
https://www.readbyqxmd.com/read/28159865/comparative-transcriptomics-of-malaria-mosquito-testes-function-evolution-and-linkage
#5
Bryan J Cassone, Raissa G G Kay, Matthew P Daugherty, Bradley J White
Testes-biased genes evolve rapidly and are important in the establishment, solidification, and maintenance of reproductive isolation between incipient species. The Anopheles gambiae complex, a group of at least eight isomorphic mosquito species endemic to Sub-Saharan Africa, is an excellent system to explore the evolution of testes-biased genes. Within this group, the testes are an important tissue in the diversification process since hybridization between species results in sterile hybrid males, but fully fertile females...
February 7, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28155540/optimizing-novel-penetration-enhancing-hybridized-vesicles-for-augmenting-the-in-vivo-effect-of-an-anti-glaucoma-drug
#6
Sarah S Naguib, Rania M Hathout, Samar Mansour
Usually the topical delivery of ocular drugs poses a great challenge. Accordingly, the work in this study comprised the use of different hybrids of generally regarded as safe (GRAS) oils and surfactants in order to develop and optimize novel acetazolamide (AZD) entrapped-vesicular systems aiming at improving its ocular delivery and reaching better therapeutic outcomes in the treatment of glaucoma. The phospholipid/cholesterol bilayer of the vesicles was enriched with hybrids of Tween 80, Labrasol, Transcutol and Labrafac lipophile WL in different masses and proportions according to a mixture design viz...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28154946/rhizobium-rhizosphaerae-sp-nov-a-novel-species-isolated-from-rice-rhizosphere
#7
Juan-Juan Zhao, Jun Zhang, Rui-Jie Zhang, Cai-Wen Zhang, Hua-Qun Yin, Xiao-Xia Zhang
Two novel, Gram-negative, motile, rod-shaped, aerobic bacterial strains, MH17(T) and RD15, were isolated from the sterilized root and rhizosphere soil of rice, respectively. Phylogenetic analysis based on 16S rRNA gene sequences showed that the similarity between strains MH17(T) and RD15 was 100%. The isolates exhibit high sequence similarities to Rhizobium oryzae CGMCC 1.7048(T) (98.7%) and Rhizobium petrolearium SL-1(T) (97.0% and 97.1%), which supports that they belong to a novel species in the genus Rhizobium...
February 2, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28141898/a-combination-of-sexual-and-ecological-divergence-contributes-to-rearrangement-spread-during-initial-stages-of-speciation
#8
Genevieve M Kozak, Crista B Wadsworth, Shoshanna C Kahne, Steven M Bogdanowicz, Richard G Harrison, Brad S Coates, Erik B Dopman
Chromosomal rearrangements between sympatric species often contain multiple loci contributing to assortative mating, local adaptation, and hybrid sterility. When and how these associations arise during the process of speciation remains a subject of debate. Here, we address the relative roles of local adaptation and assortative mating on the dynamics of rearrangement evolution by studying how a rearrangement co-varies with sexual and ecological trait divergence within a species. Previously, a chromosomal rearrangement that suppresses recombination on the Z (sex) chromosome was identified in European corn borer moths (Ostrinia nubilalis)...
January 31, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28135247/whole-genome-analysis-of-introgressive-hybridization-and-characterization-of-the-bovine-legacy-of-mongolian-yaks
#9
Ivica Medugorac, Alexander Graf, Cécile Grohs, Sophie Rothammer, Yondon Zagdsuren, Elena Gladyr, Natalia Zinovieva, Johanna Barbieri, Doris Seichter, Ingolf Russ, André Eggen, Garrett Hellenthal, Gottfried Brem, Helmut Blum, Stefan Krebs, Aurélien Capitan
The yak is remarkable for its adaptation to high altitude and occupies a central place in the economies of the mountainous regions of Asia. At lower elevations, it is common to hybridize yaks with cattle to combine the yak's hardiness with the productivity of cattle. Hybrid males are sterile, however, preventing the establishment of stable hybrid populations, but not a limited introgression after backcrossing several generations of female hybrids to male yaks. Here we inferred bovine haplotypes in the genomes of 76 Mongolian yaks using high-density SNP genotyping and whole-genome sequencing...
January 30, 2017: Nature Genetics
https://www.readbyqxmd.com/read/28132142/protocol-for-producing-synthetic-polyploid-oats
#10
Toshinobu Morikawa
A protocol to produce synthetic oats by introducing alien genetic variations into cultivated oats is proposed based on suitable genetic relationships between Avena species. Furthermore, artificial hybridization procedures between different ploidy species are explained. Amphiploids can be produced by rescuing aborted embryos and treating the F1 hybrids with colchicine to overcome sterility between interspecific plants. Furthermore, I present the cytological methods for observing somatic and meiotic chromosomes in the treated hybrids...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28128318/pantoea-alhagi-a-novel-endophytic-bacterium-with-ability-to-improve-growth-and-drought-tolerance-in-wheat
#11
Chaoqiong Chen, Kaiyun Xin, Hao Liu, Juanli Cheng, Xihui Shen, Yao Wang, Lei Zhang
A novel strain LTYR-11Z(T) that exhibited multiple plant growth promoting (PGP) traits was isolated from the surface-sterilized leaves of Alhagi sparsifolia Shap. (Leguminosae), which reprsents one of the top drought tolerant plants in north-west China. Phylogenetic analysis of 16S rRNA gene sequences and multilocus sequence analysis based on partial sequences of atpD, gyrB, infB and rpoB genes revealed that strain LTYR-11Z(T) was a member of the genus Pantoea, with Pantoea theicola NBRC 110557(T) and Pantoea intestinalis DSM 28113(T) as the closest phylogenetic relatives...
January 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28126620/ifna2-of-triploid-hybrid-of-gold-fish-and-allotetraploid-is-an-intracellular-antiviral-cytokine-against-svcv-and-gcrv
#12
Jun Yan, Lingzhi Peng, Mengdie Chi, Jun Xiao, Jun Li, Shaojun Liu, Hao Feng
Sterile triploid hybrids (3n = 150) of gold fish (Carassius auratus red var., ♀, 2n = 100) and allotetroploid (♂, 2n = 100) display obviously improved disease resistance and much enhanced growth rate than their parents, which have been cultured widely in China. In this paper, one of the type I IFNs of triploid hybrid (3nIFNa2) has been cloned and characterized. The full-length cDNA of 3nIFNa2 gene consists of 715 nucleotides and the predicted 3nIFNa2 contains 183 amino acids. The transcription of 3nIFNa2 gene was detected in all the examined tissues of triploid hybrid and the mRNA level of 3nIFNa2 was obviously enhanced in response to SVCV and GCRV infection...
January 24, 2017: Fish & Shellfish Immunology
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
#13
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/28110091/genome-wide-association-analyses-reveal-the-genetic-basis-of-stigma-exsertion-in-rice
#14
Hao Zhou, Pingbo Li, Weibo Xie, Saddam Hussain, Yibo Li, Duo Xia, Hu Zhao, Shengyuan Sun, Junxiao Chen, Hong Ye, Jun Hou, Da Zhao, Guanjun Gao, Qinglu Zhang, Gongwei Wang, Xingming Lian, Jinghua Xiao, Sibin Yu, Xianghua Li, Yuqing He
Stigma exsertion, a key determinant of the rice mating system, greatly contributes to the application of heterosis in rice. As few QTLs have been fine mapped or cloned, the genetic architecture of stigma exsertion is quite unclear. We performed genome-wide association study of stigma exsertion and related traits using 6.5 million SNPs characterized in 533 diverse accessions of Oryza sativa. We identified 23 loci significantly associated with stigma exsertion and related traits, three of which were co-located with three major grain size genes GS3, GW5 and GW2...
January 18, 2017: Molecular Plant
https://www.readbyqxmd.com/read/28098850/a-rare-exception-to-haldane-s-rule-are-x-chromosomes-key-to-hybrid-incompatibilities
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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