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Genetic dissection of maternal influence on in vivo haploid induction in maize

The Crop Journal 2020年第2期8卷 287-298页

作者： Sudha K.Nair Vijay Chaikam Manje Gowda Vemuri Hindu Albrecht E.Melchinger Prasanna M.Boddupalli International Maize and Wheat Improvement Center(CIMMYT) ICRISAT CampusPatancheruGreater Hyderabad 502324India International Maize and Wheat Improvement Center(CIMMYT) ICRAF CampusUN AvenueGigiriP.O.Box 1041-00621NairobiKenya Institute of Plant Breeding Seed Science and Population GeneticsUniversity of HohenheimD-70593 StuttgartGermany

In vivo haploid induction based on maternal haploid inducers is the first step in deriving completely homozygous maize doubled haploid(DH) lines. Haploid induction rate(HIR) is influenced by both pollen parent inducing haploidy and the maternal source germplasm used in induction crosses. This study was aimed at analyzing the influence of source germplasm on HIR using 671 tropical inbred lines organized in two association mapping panels. These two association mapping panels(AMP1 and AMP2) were crossed to two different Tropically Adapted Inducer Lines(TAILs). For HIR assessment, seeds from induction crosses were planted in the field and ploidy status of each surviving plant was assessed using a gold standard classification based on visual differences between the haploid and diploid plants. The analysis revealed significant variation for HIR and led to identification of several tropical inbred lines that respond very positively to haploid induction. Use of HIR data in a genome wide association study(GWAS) led to identification of twenty-seven and two SNPs that were significantly associated with HIR in AMP1 and AMP2,respectively. Meta-analysis of AMP1 and AMP2 GWAS led to identification of 52 SNPs with significant effect on HIR across both studies. Genome-wide prediction revealed moderate to high prediction accuracy within AMPs using random SNPs. Inclusion of the SNPs detected in GWAS into the prediction model led to improvement in prediction accuracy. Overall, the study revealed that the maternal influence on HIR is controlled by a few moderate and many small effect QTL.

关键词： planted prediction vivo

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An implementation strategy to quantify the marine microbial carbon pump and its sensitivity to global change

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National Science Review 2018年第4期5卷 474-480页

作者： Carol Robinson Douglas Wallace Jung-Ho Hyun Luca Polimene Ronald Benner Yao Zhang Ruanhong Cai Rui Zhang Nianzhi Jiao University of East Anglia School of Environmental Sciences Oceanography Department Dalhousie University Hanyang University Department of Marine Science and Convergence Engineering Plymouth Marine Laboratory University of South Carolina Department of Biological Sciences and School of the EarthOcean and Environment State Key Laboratory of Marine Environmental Science and Institute of Marine Microbes and Ecospheres

INTRODUCTION The persistence of the vast pool of recalcitrant dissolved organic carbon(RDOC)in the deep ocean is fundamental to both global carbon cycling and global ***,quantitative understanding of the mechanisms that produce and utilize RDOC is still in its *** from a conceptual framework to quantitative understanding in marine carbon cycling can take the international research community several decades—precious time

关键词： MCP An implementation strategy to quantify the marine microbial carbon pump and its sensitivity to global change

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The Super Dual Auroral Radar Network (SuperDARN): An overview of its development and science

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Advances in Polar Science 2013年第1期24卷 1-11页

作者： Mark Lester Department of Physics and Astronomy University of Leicester

The Super Dual Auroral Radar Network （SuperDARN） is a network of HF coherent scatter radars. At the end of 2012 there were 31 operational radars of which 22 were in the northern hemisphere and 9 in the southern hemisphere. The radars are operated by 17 different research groups from 11 different countries. In this paper we give an overview of the network and its development over the last twenty years, concentrating on the nature of the collaboration. We describe the data parameters that are available, radar operational modes, and the structure of the SuperDARN collaboration. A brief, ＂light touch＂ review is also given of the science achieved with the network. Finally we give a brief look to future science directions.

关键词： ionosphere magnetosphere SuperDARN

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GUEST EDITORIAL:NEW TRENDS ON SERVICE SYSTEMS AND SERVICE MANAGEMENT

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Journal of Systems Science and Systems Engineering 2008年第2期17卷 129-131页

作者： Imed KACEM LOSI-ICD CNRS FRE 2848 Université de technologie de TroyesFrance

The International Conference on Service Systems and Service Management （ICSSSM06） was held on October 25-27, 2006 in Troyes, France. This conference was sponsored by IEEE Systems, Man and Cybernetics Society. More than 500 articles were submitted to the conference and after a peer-reviewing process, 284 papers were accepted and published in the conference proceedings.

关键词： GUEST EDITORIAL FTL QN CLSP than

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钢锭模用灰铸铁服役工况下的组织与力学行为研究

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机械工程学报 2014年第2期50卷 116-124页

作者：兰鹏李阳原卓浩张家泉张瑞天北京科技大学钢铁冶金新技术国家重点实验室北京100083 北京科技大学冶金与生态工程学院北京100083 鞍钢附企综合企业公司鞍山114051

依据灰铁钢锭模的铸造工艺制作试样,通过试验手段,模拟其服役热历程,分析微观组织、力学行为与使用寿命的关系。重点考察不同热作用历程后铸铁的石墨基体与拉伸性能的变化规律。研究发现,珠光体灰铁试样在400℃附近存在抗拉强度随温度... 详细信息

依据灰铁钢锭模的铸造工艺制作试样,通过试验手段,模拟其服役热历程,分析微观组织、力学行为与使用寿命的关系。重点考察不同热作用历程后铸铁的石墨基体与拉伸性能的变化规律。研究发现,珠光体灰铁试样在400℃附近存在抗拉强度随温度升高而增大的反常区,并认为这可能与预先热模拟处理后造成的内耗变化有关。试样经800℃保温3 h并控温冷却后,其600℃以下的抗拉强度可提高45%以上;同时,试样各温度下的抗拉强度均随热循环作用的次数(最多热循环处理50次)增加而减小,且这一现象在20次循环处理后尤为显著。基于光学显微镜、扫描电镜和能谱分析等表征手段,揭示其拉伸性能、变形行为与基体组织形貌的相关性,并探讨大型灰铁钢锭模的失效机制和合理使用工艺。

关键词：铸铁钢锭模组织力学行为

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