Grain size is a major determinant of grain weight, which is one of the components of rice yield. The objective o this study was to identify novel, and important quantitative trait loci(QTLs) for grain size and weight ...Grain size is a major determinant of grain weight, which is one of the components of rice yield. The objective o this study was to identify novel, and important quantitative trait loci(QTLs) for grain size and weight in rice. QTLs were mapped using a BC4F4 population including 192 backcross inbred lines(BILs) derived from a backcross between Xiaolijing(XLJ) and recombinant inbred lines(RILs). The mapping population was planted in both Lingshui(Hainan, 2015) and Fuyang(Zhejiang, 2016), with the short-and long-day conditions, respectively. A total of 10 QTLs for grain length, four for grain width, four for the ratio of grain length to width, and 11 for grain weight were detected in at least one environment and were distributed across 11 chromosomes. The phenotypic variance explained ranged from 6.76–25.68%, 14.30–34.03%, 5.28–26.50%, and 3.01–22.87% for grain length, grain width, the ratio of grain length to width, and thousand grain weight, respectively. Using the sequential residual heterozygotes(SeqRHs) method, qGS7.1, a QTL for grain size and weight, was mapped in a 3.2-Mb interval on chromosome 7. No QTLs about grain size and weight were reported in previous studies in this region, providing a good candidate for functional analysis and breeding utilization.展开更多
目的分析2013—2023年缺血性卒中和睡眠相关性研究的现状及研究热点。方法在Web of Science核心合集中检索2013年1月1日—2023年12月31日缺血性卒中和睡眠相关性研究的文献。使用RStudio的bibliometrix软件包和VOSviewer软件对该领域研...目的分析2013—2023年缺血性卒中和睡眠相关性研究的现状及研究热点。方法在Web of Science核心合集中检索2013年1月1日—2023年12月31日缺血性卒中和睡眠相关性研究的文献。使用RStudio的bibliometrix软件包和VOSviewer软件对该领域研究的发文量、国家/地区、机构、作者、期刊、文献引用、关键词和研究热点进行分析,并进行可视化呈现。结果共检索到798篇文献。以通信作者分析,中国发文199篇,居全球首位,且与多个国家建立了合作关系。美国发文196篇,位列第2。发文量最多的机构是加拿大多伦多大学,共34篇。发文量前10位的作者中5位来自美国密歇根大学,相互合作较密切,其中美国学者Devin L Brown发表文章数量为28篇,被引频次236次,发文量和被引频次均居首位。发文量最多的期刊是Sleep Medicine(74篇),发表文章被引频次最高的期刊是Stroke(3542次)。关键词可视化分析发现卒中与睡眠呼吸暂停出现频次最高。在卒中与睡眠相关性研究领域,研究主题分析提示失眠、抑郁作为基础课题对该领域发展非常重要,卒中预防、功能结局、脑血流主题研究需要努力开发。结论越来越多的研究聚焦于缺血性卒中和睡眠之间的关联性,中国和美国在该领域发表文献较多,睡眠呼吸障碍是主要研究热点。未来在卒中和睡眠领域可探索失眠、抑郁、卒中预防、功能结局、脑血流等主题。展开更多
为深入探索老山芹种子休眠机理,以老山芹层积前后种子为研究对象,采用气相色谱-飞行时间质谱联用技术(gas chromatography-time of flight mass spectrometry,GC-TOF/MS)对其非层积种子(non-lamellarized seeds,NS)和层积后达到发芽状...为深入探索老山芹种子休眠机理,以老山芹层积前后种子为研究对象,采用气相色谱-飞行时间质谱联用技术(gas chromatography-time of flight mass spectrometry,GC-TOF/MS)对其非层积种子(non-lamellarized seeds,NS)和层积后达到发芽状态种子(germination seeds,GS)的差异代谢物进行分析。结果表明,共检测到995种代谢产物,NS和GS的代谢物存在明显分离,差异代谢物有126种,其中极显著差异代谢物75种,包括35种上调,40种下调。对极显著差异代谢物所在代谢通路分析表明,涉及10条关键代谢通路。和弦图分析表明,差异代谢物中脂质类化合物(含类脂分子)与苯类化合物呈极显著正相关;苯丙烷类化合物(含聚酮类化合物)与有机氧类化合物呈极显著负相关。以上研究结果为探索老山芹种子成熟后萌发提供了代谢组学理论基础,为更好地研究老山芹种子后成熟及休眠机制提供了依据和支撑。展开更多
基金supported by grants from the National Key Research and Development Program of China (2018YFD0100806)the Zhejiang Provincial Natural Science Foundation of China (LY18C130008)+2 种基金the National Natural Science Foundation of China (31521064)the Major Project of the Genetically Modified and National Key Transgenic Research Projects, China (2016ZX08001-002)the Super Rice Breeding Innovation Team and Rice Heterosis Mechanism Research Innovation Team of the Chinese Academy of Agricultural Sciences Innovation Project (CAASASTIP-2013-CNRRI)
文摘Grain size is a major determinant of grain weight, which is one of the components of rice yield. The objective o this study was to identify novel, and important quantitative trait loci(QTLs) for grain size and weight in rice. QTLs were mapped using a BC4F4 population including 192 backcross inbred lines(BILs) derived from a backcross between Xiaolijing(XLJ) and recombinant inbred lines(RILs). The mapping population was planted in both Lingshui(Hainan, 2015) and Fuyang(Zhejiang, 2016), with the short-and long-day conditions, respectively. A total of 10 QTLs for grain length, four for grain width, four for the ratio of grain length to width, and 11 for grain weight were detected in at least one environment and were distributed across 11 chromosomes. The phenotypic variance explained ranged from 6.76–25.68%, 14.30–34.03%, 5.28–26.50%, and 3.01–22.87% for grain length, grain width, the ratio of grain length to width, and thousand grain weight, respectively. Using the sequential residual heterozygotes(SeqRHs) method, qGS7.1, a QTL for grain size and weight, was mapped in a 3.2-Mb interval on chromosome 7. No QTLs about grain size and weight were reported in previous studies in this region, providing a good candidate for functional analysis and breeding utilization.
文摘目的分析2013—2023年缺血性卒中和睡眠相关性研究的现状及研究热点。方法在Web of Science核心合集中检索2013年1月1日—2023年12月31日缺血性卒中和睡眠相关性研究的文献。使用RStudio的bibliometrix软件包和VOSviewer软件对该领域研究的发文量、国家/地区、机构、作者、期刊、文献引用、关键词和研究热点进行分析,并进行可视化呈现。结果共检索到798篇文献。以通信作者分析,中国发文199篇,居全球首位,且与多个国家建立了合作关系。美国发文196篇,位列第2。发文量最多的机构是加拿大多伦多大学,共34篇。发文量前10位的作者中5位来自美国密歇根大学,相互合作较密切,其中美国学者Devin L Brown发表文章数量为28篇,被引频次236次,发文量和被引频次均居首位。发文量最多的期刊是Sleep Medicine(74篇),发表文章被引频次最高的期刊是Stroke(3542次)。关键词可视化分析发现卒中与睡眠呼吸暂停出现频次最高。在卒中与睡眠相关性研究领域,研究主题分析提示失眠、抑郁作为基础课题对该领域发展非常重要,卒中预防、功能结局、脑血流主题研究需要努力开发。结论越来越多的研究聚焦于缺血性卒中和睡眠之间的关联性,中国和美国在该领域发表文献较多,睡眠呼吸障碍是主要研究热点。未来在卒中和睡眠领域可探索失眠、抑郁、卒中预防、功能结局、脑血流等主题。
文摘为深入探索老山芹种子休眠机理,以老山芹层积前后种子为研究对象,采用气相色谱-飞行时间质谱联用技术(gas chromatography-time of flight mass spectrometry,GC-TOF/MS)对其非层积种子(non-lamellarized seeds,NS)和层积后达到发芽状态种子(germination seeds,GS)的差异代谢物进行分析。结果表明,共检测到995种代谢产物,NS和GS的代谢物存在明显分离,差异代谢物有126种,其中极显著差异代谢物75种,包括35种上调,40种下调。对极显著差异代谢物所在代谢通路分析表明,涉及10条关键代谢通路。和弦图分析表明,差异代谢物中脂质类化合物(含类脂分子)与苯类化合物呈极显著正相关;苯丙烷类化合物(含聚酮类化合物)与有机氧类化合物呈极显著负相关。以上研究结果为探索老山芹种子成熟后萌发提供了代谢组学理论基础,为更好地研究老山芹种子后成熟及休眠机制提供了依据和支撑。
