Genomic mosaicism due to homoeologous exchange generates extensive phenotypic diversity in nascent allopolyploids

Allopolyploidy is an important process in plant speciation, yet newly formed allopolyploid species typically suffer from extreme genetic bottlenecks. One escape from this impasse might be homoeologous meiotic pairing, during which homoeologous exchanges (HEs) generate phenotypically variable progeny. However, the immediate genome-wide patterns and resulting phenotypic diversity generated by HEs remain largely unknown. Here, we analyzed the genome composition of 202 phenotyped euploid segmental allopolyploid individuals from the fourth selfed generation following chromosomal doubling of reciprocal F1 hybrids of crosses between rice subspecies, using whole-genome sequencing. We describe rampant occurrence of HEs that, by overcoming incompatibility or conferring superiority of hetero-cytonuclear interactions, generate extensive and individualized genomic mosaicism across the analyzed tetraploids. We show that the resulting homoeolog copy number alteration in tetraploids affects known-function genes and their complex genetic interactions, in the process creating extraordinary phenotypic diversity at the population level following a single initial hybridization. Our results illuminate the immediate genomic landscapes possible in a tetraploid genomic environment, and underscore HE as an important mechanism that fuels rapid phenotypic diversification accompanying the initial stages of allopolyploid evolution.     

浅议黄石科技企业人才环境现状

企业发展,人才是关键.良好的人才环境具有强有力的"洼地"人才汇聚作用,营造良好的人才环境逐渐成为当今企业吸引并最终留住人才的重要途径.科技企业应结合自身实际创建良好的人才环境,实现企业内部人才的充分利用,并且积极吸收外部人才,形成企业发展的良性循环.     

维生素C,让皮肤健康起来

介绍了常见的皮肤问题;介绍了维生素C的性质用途以及在皮肤保养和美白中的作用,以及维生素C的合理补充.     

大学生健康信息规避量表构建研究

[目的/意义]构建稳健而实用的大学生健康信息规避(HIA)量表,以期为有效测度大学生HIA倾向及HIA相关研究提供前期基础,并为健康服务机构和大学生群体合理应对HIA提供有益参考与借鉴。[方法/过程]采用选择性暴露理论和前期调研,开发大学生HIA初步量表;利用初步量表对277名大学生进行施测,对获取的实证数据进行探索性因子分析和验证性因子分析,通过信效度检验后形成大学生HIA正式量表。[结果/结论]大学生HIA具有负面情绪、认知冲突和行为改变的三重结构,总量表重测信度为0.951,3个维度的重测信度在0.871-0.919,具体涉及10个测量项目。     

高职院校学生职业核心素养培养路径探究

培养学生的职业核心素养是职业教育人才培养的必然要求.厘清职业核心素养的基本涵义,以湖南三一工业职业技术学院为例,探讨高职院校从顶层设计改革优化教学内容,创新教学方式,培养学生职业核心素养.