Ulva prolifera is the causative species of the annually occurring large-scale green tides in China since 2007.Its specific biological features on reproductivity strategies,as well as intra-species genetic diversity,ar...Ulva prolifera is the causative species of the annually occurring large-scale green tides in China since 2007.Its specific biological features on reproductivity strategies,as well as intra-species genetic diversity,are still largely unknown,especially at the genome level,despite their importance in understanding the formation and outbreak of massive green tides.In the present study,the restriction site-associated DNA genotyping approach(2b-RAD)was adopted to identify the genome-wide single-nucleotide polymorphisms(SNPs)of 54 individual thalli including samples collected from Subei Shoal in 2019 and Qingdao coast from 2019 to 2021.SNPs genotype results revealed that most of the thalli in 2019 and 2020 were haploid gametophytes,while only half of the thalli were gametophytes in 2021,indicating flexibility in the reproductive strategies for the formation of the green tides among different years and the dominance of asexual and vegetative reproductive mode for the floating period.Besides,population analysis was conducted,and it revealed a very low genetic diversity among samples from Subei Shoal and the Qingdao coast in the same year and a higher divergence among samples in different years.The results showed the efficiency of 2b-RAD in the exploration of SNPs in U.prolifera and provided the first genome-wide scale evidence for the origin of the large-scale green tides on the Qingdao coast.This study improved our understanding of the reproductive strategy and genetic diversity of the green tide causative species and will help further reveal the biological causes of the green tide in China.展开更多
性别特异分子标记的筛选是分子辅助单性育种的重要技术手段。本研究基于雌雄各20尾线纹海马的2b-RAD测序数据,比较分析并筛选出一个雄性特异的tag scaffold63和一个性别二态的SNP位点QSNP63,并在大规模群体中进行了验证。PCR扩增显示在...性别特异分子标记的筛选是分子辅助单性育种的重要技术手段。本研究基于雌雄各20尾线纹海马的2b-RAD测序数据,比较分析并筛选出一个雄性特异的tag scaffold63和一个性别二态的SNP位点QSNP63,并在大规模群体中进行了验证。PCR扩增显示在108尾海马中scaffold63 tag仅在雄海马中检测到,而在雌海马中未检测出目的片段;108只海马中QSNP63位点测序显示所有雌性个体中该位点为G/G纯合,所有雄性个体中该位点呈现G/T杂合状态。基因注释发现tag scaffold63位于cilia- and flagella-associated protein 69-like25号外显子后的内含子上,QSNP63位于leucine-rich repeats and IQ motif containing 1基因8号外显子上。综上,本研究筛选到的线纹海马性别特异分子标记及候选基因为进一步解析线纹海马的性别决定机制奠定了基础。展开更多
基金Supported by the Laoshan Laboratory (No.LSKJ202204005)the Mount Tai Scholar Climbing Plan to Song SUNthe Open Fund of CAS Key Laboratory of Marine Ecology and Environmental Sciences,Institute of Oceanology,Chinese Academy of Sciences (No.KLMEES201801)
文摘Ulva prolifera is the causative species of the annually occurring large-scale green tides in China since 2007.Its specific biological features on reproductivity strategies,as well as intra-species genetic diversity,are still largely unknown,especially at the genome level,despite their importance in understanding the formation and outbreak of massive green tides.In the present study,the restriction site-associated DNA genotyping approach(2b-RAD)was adopted to identify the genome-wide single-nucleotide polymorphisms(SNPs)of 54 individual thalli including samples collected from Subei Shoal in 2019 and Qingdao coast from 2019 to 2021.SNPs genotype results revealed that most of the thalli in 2019 and 2020 were haploid gametophytes,while only half of the thalli were gametophytes in 2021,indicating flexibility in the reproductive strategies for the formation of the green tides among different years and the dominance of asexual and vegetative reproductive mode for the floating period.Besides,population analysis was conducted,and it revealed a very low genetic diversity among samples from Subei Shoal and the Qingdao coast in the same year and a higher divergence among samples in different years.The results showed the efficiency of 2b-RAD in the exploration of SNPs in U.prolifera and provided the first genome-wide scale evidence for the origin of the large-scale green tides on the Qingdao coast.This study improved our understanding of the reproductive strategy and genetic diversity of the green tide causative species and will help further reveal the biological causes of the green tide in China.
文摘性别特异分子标记的筛选是分子辅助单性育种的重要技术手段。本研究基于雌雄各20尾线纹海马的2b-RAD测序数据,比较分析并筛选出一个雄性特异的tag scaffold63和一个性别二态的SNP位点QSNP63,并在大规模群体中进行了验证。PCR扩增显示在108尾海马中scaffold63 tag仅在雄海马中检测到,而在雌海马中未检测出目的片段;108只海马中QSNP63位点测序显示所有雌性个体中该位点为G/G纯合,所有雄性个体中该位点呈现G/T杂合状态。基因注释发现tag scaffold63位于cilia- and flagella-associated protein 69-like25号外显子后的内含子上,QSNP63位于leucine-rich repeats and IQ motif containing 1基因8号外显子上。综上,本研究筛选到的线纹海马性别特异分子标记及候选基因为进一步解析线纹海马的性别决定机制奠定了基础。
