【目的】南方根结线虫是威胁桃产业绿色发展的地下主要害虫,开发抗性分子标记,对抗性砧木分子育种具有重要意义。【方法】根据前人对桃砧木抗根结线虫的定位结果,在GDR网站peach genome V2.0查询定位区间的候选基因。在5个抗病、5个感...【目的】南方根结线虫是威胁桃产业绿色发展的地下主要害虫,开发抗性分子标记,对抗性砧木分子育种具有重要意义。【方法】根据前人对桃砧木抗根结线虫的定位结果,在GDR网站peach genome V2.0查询定位区间的候选基因。在5个抗病、5个感病种质中扩增候选基因,并通过DNAMAN、IGV等软件对候选基因进行序列差异分析,开发抗南方根结线虫KASP分子标记,在抗性种质筑波3号与感性种质哈露红的杂交F2群体中对该分子标记进行验证,并与前人开发的SCAR和35 bp indel抗南方根结线虫分子标记的准确性进行比较。【结果】KASP标记结果将基因型划分为3种,分别为抗性纯合型(A),抗性杂合型(B),感性纯合型(C),A∶B∶C=42∶94∶64,与表型符合率为88.5%;SCAR标记检测结果划分为2种,分别为抗病型(A1)和感病型(C1),A1∶C1=135∶65,与表型符合率为87.0%;35 bp indel分子标记分为3种类型,分别为抗性纯合型(A2),抗性杂合型(B2),感性纯合型(C2),A2∶B2∶C2=1∶154∶45,与表型符合率为52.0%。【结论】本研究中开发的KASP标记提高了分子标记选择准确率,对抗南方根结线虫分子育种具有重要意义。展开更多
The small muddy areas developed in the southern Shandong Peninsula have attracted increasing attention from researchers because of complex changes in sediment sources driven by sea-level fluctuations and land-sea inte...The small muddy areas developed in the southern Shandong Peninsula have attracted increasing attention from researchers because of complex changes in sediment sources driven by sea-level fluctuations and land-sea interactions since the late Pleistocene.This study investigates the evolution of sediment sources and their responses to environmental changes since the late Pleistocene,using core WHZK01 collected from the nearshore muddy area in southern Weihai for rare earth element(REE)analysis.In doing so,this work highlights the changing patterns of material sources and the primary control factors.The results reveal that the sedimentary deposits in core WHZK01 exhibit distinct terrestrial characteristics.Discriminant function analysis(F_(D))and source discrimination dia-grams both suggest that the primary sources of these deposits are the Yellow River and adjacent small and medium-sized rivers,although the sources vary among different sedimentary units.Furthermore,the DU3 layer(17.82-25.10 m)displays typical riverine sedimentation,dominated by terrestrial detrital input,primarily from the local rivers,namely the Huanglei and Muzhu Rivers.The material in the DU2 layer(14.91-17.82 m)is mainly influenced by a mixture of the Qinglong and Yellow Rivers.The DU1 layer(0-14.91 m)is influenced by sea-level changes during the Holocene,with the Yellow River being the primary source,although there is also some input from local rivers.The changes in sea level during the Holocene and the input of Yellow River material carried by the coastal currents of the Yellow Sea are identified as the main controlling factors for the changes in material sources in the study area since the late Pleistocene,with small and mediumsized rivers also exerting some influence on the material sources.The above mentioned findings not only contribute to a better understanding of the source-sink systems of the Yellow River and adjacent small and mediumsized rivers but also deepen our understanding of the late Quaternary land-sea interactions in the Shandong Peninsula.展开更多
Small mountainous rivers are characterized by large instantaneous fluxes and susceptible to extreme weather events,which can rapidly transport materials into the sea and have a significant impact on the ecological env...Small mountainous rivers are characterized by large instantaneous fluxes and susceptible to extreme weather events,which can rapidly transport materials into the sea and have a significant impact on the ecological environment of estuaries and bays.In order to investigate the seasonal characteristics of nutrients in small mountainous rivers in the subtropical monsoon region and the output pattern to the sea during heavy precipitation,surveys on the mountainous rivers were carried out in Baixi watershed in August 2020(wet season),March 2021(dry season)and June 2021(Meiyu period).The results showed that the dissolved inorganic nitrogen(DIN)of the rivers has an average concentration of 752μg L^(−1)in the wet season and 1472μg L^(−1)in the dry season.The concentrations of dissolved inorganic phosphorus(DIP)in wet season and dry season were 63μg L^(−1)and 51μg L^(−1),respectively.Influenced by the changes of land use in sub-watersheds,DIN concentrations in the mainstream increased from 701μg L^(−1)in the upper reaches to 1284μg L^(−1)in the middle reaches.Two rainstorms during the Meiyu period in the watershed caused the pulse runoff in the river.The maximum daily runoff reached 70 times that before rains.The maximum daily fluxes of DIN and DIP were 109 and 247 times that before rains,respectively.In view that the watershed experienced several rainstorms in the wet season,the river,with pulse runoff,carries a large amount of nutrients into the sea in a short time,which will have a significant impact on the environment of Sanmen bay and its adjacent sea.展开更多
文摘【目的】南方根结线虫是威胁桃产业绿色发展的地下主要害虫,开发抗性分子标记,对抗性砧木分子育种具有重要意义。【方法】根据前人对桃砧木抗根结线虫的定位结果,在GDR网站peach genome V2.0查询定位区间的候选基因。在5个抗病、5个感病种质中扩增候选基因,并通过DNAMAN、IGV等软件对候选基因进行序列差异分析,开发抗南方根结线虫KASP分子标记,在抗性种质筑波3号与感性种质哈露红的杂交F2群体中对该分子标记进行验证,并与前人开发的SCAR和35 bp indel抗南方根结线虫分子标记的准确性进行比较。【结果】KASP标记结果将基因型划分为3种,分别为抗性纯合型(A),抗性杂合型(B),感性纯合型(C),A∶B∶C=42∶94∶64,与表型符合率为88.5%;SCAR标记检测结果划分为2种,分别为抗病型(A1)和感病型(C1),A1∶C1=135∶65,与表型符合率为87.0%;35 bp indel分子标记分为3种类型,分别为抗性纯合型(A2),抗性杂合型(B2),感性纯合型(C2),A2∶B2∶C2=1∶154∶45,与表型符合率为52.0%。【结论】本研究中开发的KASP标记提高了分子标记选择准确率,对抗南方根结线虫分子育种具有重要意义。
基金supported by the Natural Science Foundation of Shandong Province(No.ZR2022MD114)the Project of Global Earth Observation on Asian Delta and Estuary Corresponding to Anthropogenic Impacts and Climate Changes(No.2019YFE0127200).
文摘The small muddy areas developed in the southern Shandong Peninsula have attracted increasing attention from researchers because of complex changes in sediment sources driven by sea-level fluctuations and land-sea interactions since the late Pleistocene.This study investigates the evolution of sediment sources and their responses to environmental changes since the late Pleistocene,using core WHZK01 collected from the nearshore muddy area in southern Weihai for rare earth element(REE)analysis.In doing so,this work highlights the changing patterns of material sources and the primary control factors.The results reveal that the sedimentary deposits in core WHZK01 exhibit distinct terrestrial characteristics.Discriminant function analysis(F_(D))and source discrimination dia-grams both suggest that the primary sources of these deposits are the Yellow River and adjacent small and medium-sized rivers,although the sources vary among different sedimentary units.Furthermore,the DU3 layer(17.82-25.10 m)displays typical riverine sedimentation,dominated by terrestrial detrital input,primarily from the local rivers,namely the Huanglei and Muzhu Rivers.The material in the DU2 layer(14.91-17.82 m)is mainly influenced by a mixture of the Qinglong and Yellow Rivers.The DU1 layer(0-14.91 m)is influenced by sea-level changes during the Holocene,with the Yellow River being the primary source,although there is also some input from local rivers.The changes in sea level during the Holocene and the input of Yellow River material carried by the coastal currents of the Yellow Sea are identified as the main controlling factors for the changes in material sources in the study area since the late Pleistocene,with small and mediumsized rivers also exerting some influence on the material sources.The above mentioned findings not only contribute to a better understanding of the source-sink systems of the Yellow River and adjacent small and mediumsized rivers but also deepen our understanding of the late Quaternary land-sea interactions in the Shandong Peninsula.
基金financially supported by the Postdoctoral Foundation of Qingdao(Pb Isotopes of Oujiang River to Quantitatively Identify Sediment Provenance in Oujiang Estuary and Adjacent Area)the China Geological Survey Project(No.DD20190276)the Fund of Ministry of Science and Technology(Nos.2013FY112200 and 2019YFE0127200).
文摘Small mountainous rivers are characterized by large instantaneous fluxes and susceptible to extreme weather events,which can rapidly transport materials into the sea and have a significant impact on the ecological environment of estuaries and bays.In order to investigate the seasonal characteristics of nutrients in small mountainous rivers in the subtropical monsoon region and the output pattern to the sea during heavy precipitation,surveys on the mountainous rivers were carried out in Baixi watershed in August 2020(wet season),March 2021(dry season)and June 2021(Meiyu period).The results showed that the dissolved inorganic nitrogen(DIN)of the rivers has an average concentration of 752μg L^(−1)in the wet season and 1472μg L^(−1)in the dry season.The concentrations of dissolved inorganic phosphorus(DIP)in wet season and dry season were 63μg L^(−1)and 51μg L^(−1),respectively.Influenced by the changes of land use in sub-watersheds,DIN concentrations in the mainstream increased from 701μg L^(−1)in the upper reaches to 1284μg L^(−1)in the middle reaches.Two rainstorms during the Meiyu period in the watershed caused the pulse runoff in the river.The maximum daily runoff reached 70 times that before rains.The maximum daily fluxes of DIN and DIP were 109 and 247 times that before rains,respectively.In view that the watershed experienced several rainstorms in the wet season,the river,with pulse runoff,carries a large amount of nutrients into the sea in a short time,which will have a significant impact on the environment of Sanmen bay and its adjacent sea.
