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https://www.readbyqxmd.com/read/29048573/the-rate-of-evolution-of-postmating-prezygotic-reproductive-isolation-in-drosophila
#1
David A Turissini, Joseph A McGirr, Sonali S Patel, Jean R David, Daniel R Matute
Reproductive isolation is an intrinsic aspect of species formation. For that reason, the identification of the precise isolating traits, and the rates at which they evolve, is crucial to understanding how species originate and persist. Previous work has measured the rates of evolution of prezygotic and postzygotic barriers to gene flow, yet no systematic analysis has studied the rates of evolution of postmating-prezygotic (PMPZ) barriers. We measured the magnitude of two barriers to gene flow that act after mating occurs but before fertilization...
October 18, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/29044571/sensitivity-of-sorghum-pollen-and-pistil-to-high-temperature-stress
#2
M Djanaguiraman, R Perumal, S V K Jagadish, I A Ciampitti, R Welti, P V V Prasad
High temperature (HT) decreases seed-set percentage in sorghum [Sorghum bicolor (L.) Moench]. The relative sensitivity of pollen and particularly pistil and the mechanistic response that induces tolerance or susceptibility to HT is not well known and hence is the major objective of this research. The male sterile (ATx399) and fertile (RTx430) lines were exposed to 30/20 °C (optimum temperature; OT), 36/26 °C (HT1 ) and 39/29 °C (HT2 ) from the start of booting to seed-set in a controlled environment. Similarly, in the field, HT stress was imposed using heat tents...
October 18, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/29041961/treatment-evaluation-of-wharton-s-jelly-derived-mesenchymal-stem-cells-using-a-chronic-salpingitis-model-an-animal-experiment
#3
Zhe Li, Zhao Zhang, Xin Chen, Juan Zhou, Xiao-Min Xiao
BACKGROUND: The present study was conducted to evaluate new methods to repair the reproductive function of the oviduct, thereby allowing gametes to combine and grow in vivo under natural circumstances. METHODS: Sixty pathogen-free female New Zealand rabbits were divided into three groups: a wild-type group, an untreated control group, and a treatment group. Disposable sterile newborn sputum suction tubes were inserted into the urogenital tract to instill an Escherichia coli suspension into the uterine cavity to establish the chronic salpingitis model...
October 17, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29036451/genetic-mapping-and-phylogenetic-analysis-reveal-intraspecific-variation-in-sex-chromosomes-of-the-virginian-strawberry
#4
Na Wei, Rajanikanth Govindarajulu, Jacob A Tennessen, Aaron Liston, Tia-Lynn Ashman
With their extraordinary diversity in sexual systems, flowering plants offer unparalleled opportunities to understand sex determination and to reveal generalities in the evolution of sex chromosomes. Comparative genetic mapping of related taxa with good phylogenetic resolution can delineate the extent of sex chromosome diversity within plant groups, and lead the way to understanding the evolutionary drivers of such diversity. The North American octoploid wild strawberries provide such an opportunity. We performed linkage mapping using targeted sequence capture for the subdioecious western Fragaria virginiana ssp...
September 27, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29032401/fine-mapping-of-the-genic-male-sterile-ms-1-gene-in-capsicum-annuum-l
#5
Kyumi Jeong, Doil Choi, Jundae Lee
The genomic region cosegregating with the genic male-sterile ms 1 gene of Capsicum annuum L. was delimited to a region of 869.9 kb on chromosome 5 through fine mapping analysis. A strong candidate gene, CA05g06780, a homolog of the Arabidopsis MALE STERILITY 1 gene that controls pollen development, was identified in this region. Genic male sterility caused by the ms 1 gene has been used for the economically efficient production of massive hybrid seeds in paprika (Capsicum annuum L.), a colored bell-type sweet pepper...
October 14, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/29031775/analysis-of-the-meiotic-transcriptome-reveals-the-genes-related-to-the-regulation-of-pollen-abortion-in-cytoplasmic-male-sterile-pepper-capsicum-annuum-l
#6
Yilan Qiu, Lijuan Liao, Xiaorui Jin, Dandan Mao, Rushi Liu
CMS, which refers to the inability to generate functional pollen grains while still producing a normal gynoecium, has been widely used for pepper hybrid seed production. Pepper line 8214A is an excellent CMS line exhibiting 100% male sterility and superior economic characteristics. A TUNEL assay revealed the nuclear DNA is damaged in 8214A PMCs during meiosis. TEM images indicated that the 8214A PMCs exhibited asynchronous meiosis after prophase I, and some PMCs degraded prematurely with morphological features typical of PCD...
October 11, 2017: Gene
https://www.readbyqxmd.com/read/29029607/mirnas-involved-in-the-development-and-differentiation-of-fertile-and-sterile-flowers-in-viburnum-macrocephalum-f-keteleeri
#7
Weixing Li, Zhichong He, Li Zhang, Zhaogeng Lu, Jing Xu, Jiawen Cui, Li Wang, Biao Jin
BACKGROUND: Sterile and fertile flowers are important evolutionary developmental phenotypes in angiosperm flowers. The development of floral organs, critical in angiosperm reproduction, is regulated by microRNAs (miRNAs). However, the mechanisms underpinning the miRNA regulation of the differentiation and development of sterile and fertile flowers remain unclear. RESULTS: Here, based on investigations of the morphological differences between fertile and sterile flowers, we used high-throughput sequencing to characterize the miRNAs in the differentiated floral organs of Viburnum macrocephalum f...
October 13, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29029382/differential-impacts-of-six-insecticides-on-a-mealybug-and-its-coccinellid-predator
#8
Paulo R R Barbosa, Martin D Oliveira, Eduardo M Barros, J P Michaud, Jorge B Torres
Broad-spectrum insecticides may disrupt biological control and cause pest resurgence due to their negative impacts on natural enemies. The preservation of sustainable pest control in agroecosystems requires parallel assessments of insecticide toxicity to target pests and their key natural enemies. In the present study, the leaf dipping method was used to evaluate the relative toxicity of six insecticides to the striped mealybug, Ferrisia dasylirii (Cockerell) (Hemiptera: Pseudococcidae) and its predator, Tenuisvalvae notata (Mulsant) (Coleoptera: Coccinellidae)...
October 5, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29022902/differential-regulation-of-spermatogenic-process-by-lkb1-isoforms-in-mouse-testis
#9
Feifei Kong, Mei Wang, Xiaojing Huang, Qiuling Yue, Xiang Wei, Xiaowei Dou, Xiaoxu Peng, Yuanyuan Jia, Ke Zheng, Tinghe Wu, Jun Yan, Jing Li
Liver serine/threonine kinase B1 (LKB1) is a tumor suppressor associated with the pathogenesis of Peutz-Jeghers syndrome. Affected males are at increased risk of developing Sertoli cell tumors and display defective spermatogenesis. Male mice lacking the short isoform (Lkb1S) of Lkb1 were sterile and exhibited abnormal spermiogenesis. In addition to the short isoform, the long isoform of Lkb1 (Lkb1L) is also expressed in testis; however, the requirement of the long isoform for fertility and the functional difference between the isoforms remain unknown...
October 12, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/29021581/molecular-identification-of-the-wheat-male-fertility-gene-ms1-and-its-prospects-for-hybrid-breeding
#10
Elise J Tucker, Ute Baumann, Allan Kouidri, Radoslaw Suchecki, Mathieu Baes, Melissa Garcia, Takashi Okada, Chongmei Dong, Yongzhong Wu, Ajay Sandhu, Manjit Singh, Peter Langridge, Petra Wolters, Marc C Albertsen, A Mark Cigan, Ryan Whitford
The current rate of yield gain in crops is insufficient to meet the predicted demands. Capturing the yield boost from heterosis is one of the few technologies that offers rapid gain. Hybrids are widely used for cereals, maize and rice, but it has been a challenge to develop a viable hybrid system for bread wheat due to the wheat genome complexity, which is both large and hexaploid. Wheat is our most widely grown crop providing 20% of the calories for humans. Here, we describe the identification of Ms1, a gene proposed for use in large-scale, low-cost production of male-sterile (ms) female lines necessary for hybrid wheat seed production...
October 11, 2017: Nature Communications
https://www.readbyqxmd.com/read/28994529/-soil-improvement-promoted-micro-ecology-of-farmlands-for-ginseng-cultivation
#11
Jiang Xu, Lin-Lin Dong, Rui Wang, Wei-Hao Niu, Nai-Wu Zhang, Fujiwara Naoki, Liang Shen, Xi-Wen Li, Shi-Lin Chen
This study has revealed the change of the soil micro-ecology of farmlands, which used for ginseng cultivation, brought by comprehensive soil improvement. The process of soil improvement was described as follows: soil was sterilized using trichloronitromethane, and then perilla seeds were planted. After growing up, the perillas were turned over into the field and fermented, then organic fertilizer was added. Rotary tillages were carried out during the intervals. Physical and chemical properties of treated soil were measured, as well as microbial diversity, which was illustrated using 16s high through-put sequencing...
March 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28988325/advances-in-understanding-the-molecular-mechanisms-of-cytoplasmic-male-sterility-and-restoration-in-rice
#12
Huiwu Tang, Yongyao Xie, Yao-Guang Liu, Letian Chen
Cytoplasmic male sterility (CMS) in plants is a male reproductive defect determined by mitochondrial genes and inherited maternally. CMS can be suppressed by nuclear restorer of fertility (Rf) genes. Therefore, CMS/Rf systems provide a classic model for the study of mitochondrial-nuclear interactions in plants. Moreover, CMS/Rf systems are economical, effective tools for the production of hybrid seeds. For example, CMS/Rf systems have been applied in over forty countries to breed hybrid rice (Oryza sativa L...
October 7, 2017: Plant Reproduction
https://www.readbyqxmd.com/read/28987005/hybrid-asexuality-as-a-primary-postzygotic-barrier-between-nascent-species-on-the-interconnection-between-asexuality-hybridization-and-speciation
#13
Karel Janko, Jan Pačes, Hilde Wilkinson-Herbots, Rui J Costa, Jan Roslein, Pavel Drozd, Nataliia Iakovenko, Jakub Rídl, Miluše Hroudová, Jan Kočí, Radka Reifová, Věra Šlechtová, Lukáš Choleva
Although sexual reproduction is ubiquitous throughout nature, the molecular machinery behind it has been repeatedly disrupted during evolution, leading to the emergence of asexual lineages in all eukaryotic phyla. Despite intensive research, little is known about what causes the switch from sexual reproduction to asexuality. Interspecific hybridization is one of the candidate explanations but the reasons for the apparent association between hybridization and asexuality remain unclear. In this study we combined cross-breeding experiments with population genetic and phylogenomic approaches to reveal the history of speciation and asexuality evolution in European spined loaches (Cobitis)...
October 7, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28983410/paternal-pachytene-pirnas-are-not-required-for-fertilization-embryonic-development-and-sperm-mediated-epigenetic-inheritance-in-mice
#14
Shuiqiao Yuan, Chong Tang, Andrew Schuster, Ying Zhang, Huili Zheng, Wei Yan
Pachytene piRNAs are MIWI-/MILI-bound small RNAs abundantly expressed in pachytene spermatocytes and round spermatids in adult mouse testes. Miwi knockout (KO) male mice are sterile due to spermiogenic arrest. In Caenorhabditis elegans, sperm-borne piRNAs appear to have an epigenetic role during fertilization and development because progeny of individuals with piRNA-deficient gametes display a progressive loss of fertility after several generations. In mice, it remains unknown whether pachytene piRNA-deficient round spermatids can produce offspring, and whether the progeny of Miwi mutants also exhibits transgenerational, progressive fertility loss...
December 2016: Environmental Epigenetics
https://www.readbyqxmd.com/read/28982045/pregnancy-outcomes-of-women-randomized-to-receive-real-versus-placebo-acupuncture-on-the-day-of-fresh-or-frozen-thawed-embryo-transfer
#15
Mimi T Y Seto, Ka Wang Cheung, Tsz Kin Lo, Ernest H Y Ng
INTRODUCTION: Acupuncture is commonly used in various aspect of Western medicine in recent years including in-vitro fertilization (IVF) treatment. Although there are many clinical trials of acupuncture in IVF and the Cochrane meta-analysis did not find benefit of adjuvant acupuncture for IVF, there is no report on the pregnancy outcomes of women who had received acupuncture during their IVF treatment. OBJECTIVES: To compare the pregnancy outcomes of women randomized to receive real versus placebo acupuncture during their IVF treatment...
September 22, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28973745/fertility-restoration-locus-and-cytoplasm-types-in-onion
#16
R R Ferreira, C A F Santos, V R Oliveira
The objective of this study was the identification of the cytoplasmic types and the genotyping for the fertility restoration nuclear locus (Ms) in 59 onion accessions, aiming at the selection of 'A' and 'B' lines essential for the obtainment of hybrids. Three markers were used to identify the cytoplasm 5' cob, orfA501, and orf725, and two were used for the Ms locus (AcSKP1 and AcPMS1). The two types of male-sterile cytoplasm ('S' and 'T'), as well as fertile cytoplasm ('N'), and the Ms and ms alleles in both homozygosity and heterozygosity were detected in the 59 genotypes evaluated in the experiment...
September 21, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28969718/last-male-sperm-precedence-in-rhynchophorus-ferrugineus-olivier-observations-in-laboratory-mating-experiments-with-irradiated-males
#17
S Musmeci, S Belvedere, R Sasso, S Arnone, M Cristofaro, P Nobili, A La Marca, A De Biase
The Red Palm Weevil (RPW) Rhynchophorus ferrugineus (Olivier 1790) is an invasive pest from southeastern Asia and Melanesia that in the last 30 years has spread widely in the Middle East and Mediterranean Basin. Its stem-boring larvae cause great damage to several palm species of the Arecaceae family, many of which are economically important for agricultural and ornamental purposes. Therefore, great attention has recently been focused in studying this species to identify sustainable and effective eradication strategies, such as sterile insect technique (SIT)...
October 3, 2017: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/28959033/temperature-dependent-sex-reversal-by-a-transformer-2-gene-edited-mutation-in-the-spotted-wing-drosophila-drosophila-suzukii
#18
Jianwei Li, Alfred M Handler
Female to male sex reversal was achieved in an emerging agricultural insect pest, Drosophila suzukii, by creating a temperature-sensitive point mutation in the sex-determination gene, transformer-2 (tra-2), using CRISPR/Cas9 (clustered regularly interspaced palindromic repeats/CRISPR-associated) homology-directed repair gene-editing. Ds-tra-2 (ts2) mutants developed as normal fertile XX and XY adults at permissive temperatures below 20 °C, but at higher restrictive temperatures (26 to 29 °C) chromosomal XX females developed as sterile intersexuals with a predominant male phenotype, while XY males developed with normal morphology, but were sterile...
September 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28957331/the-sterile-insect-technique-for-the-management-of-the-spotted-wing-drosophila-drosophila-suzukii-establishing-the-optimum-irradiation-dose
#19
Geneviève Lanouette, Jacques Brodeur, François Fournier, Véronique Martel, Marc Vreysen, Carlos Cáceres, Annabelle Firlej
The spotted wing drosophila Drosophila suzukii Matsumura (Diptera: Drosophilidae), a pest of berries stone fruits, invaded North America and Europe in 2008. Current control methods rely mainly on insecticides. The sterile insect technique (SIT) has potential as an additional control tactic for the integrated management of D. suzukii. As a step towards the development of the SIT, this study aimed at finding the optimum irradiation dose to sterilize D. suzukii under controlled laboratory conditions. Four-day-old D...
2017: PloS One
https://www.readbyqxmd.com/read/28957318/use-of-rhodamine-b-to-mark-the-body-and-seminal-fluid-of-male-aedes-aegypti-for-mark-release-recapture-experiments-and-estimating-efficacy-of-sterile-male-releases
#20
Brian J Johnson, Sara N Mitchell, Christopher J Paton, Jessica Stevenson, Kyran M Staunton, Nigel Snoad, Nigel Beebe, Bradley J White, Scott A Ritchie
BACKGROUND: Recent interest in male-based sterile insect technique (SIT) and incompatible insect technique (IIT) to control Aedes aegypti and Aedes albopictus populations has revealed the need for an economical, rapid diagnostic tool for determining dispersion and mating success of sterilized males in the wild. Previous reports from other insects indicated rhodamine B, a thiol-reactive fluorescent dye, administered via sugar-feeding can be used to stain the body tissue and seminal fluid of insects...
September 2017: PLoS Neglected Tropical Diseases
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