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Species richness and biodiversity significance of alpine micro-waterbody systems in Gaoligong Mountain, Northwest Yunnan, China 被引量:1
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作者 LIU Shuo-Ran Davide FORNACCA +8 位作者 YANG Dao-De TAN Lu LI Xian-Fu ren guo-peng SUN Jun HE Xiao-Yang YANG Wen-Shu CAI Qing-Hua XIAO Wen 《Journal of Mountain Science》 SCIE CSCD 2020年第4期907-918,共12页
Water quality, size, connectivity and other physical properties of hydrological systems might have different functions in the formation and maintenance of biodiversity, but this remains mostly unclear due to the lack ... Water quality, size, connectivity and other physical properties of hydrological systems might have different functions in the formation and maintenance of biodiversity, but this remains mostly unclear due to the lack of undisturbed sites for experimental modelling. Alpine freshwater habitats such as micro-waterbodies(MWB) represent a kind of natural system suitable for biodiversity research. In order to assess potential linkages between environmental factors, connectivity of MWBs and aquatic species richness, we conducted a pilot study in two separated MWB systems located in Gaoligong Mountain, northwest Yunnan province, China. A total of 27 MWBs have been analyzed, including 22 connected and 5 isolated bodies. 13 conventional environmental factors were tested while all kinds of aquatic macro-organisms were collected and classified. Results showed a high environmental heterogeneity among MWBs and significant differences between the two systems but only a few environmental variables such as the depth of soil bottom, total Nitrogen and altitude were related to species richness and the formation of the community structure. As a benefit from the high environmental heterogeneity, the cascaded MWB systems provided divergent habitats able to support species richness at a higher level than the same number of randomly selected MWBs. This finding supports the idea that habitat connectivity matters also in extremely small aquatic ecosystems. Moreover, although still a preliminary result, a polarization effect within connected chains where edge MWBs host higher taxa and endemic taxa richness as well as larger populations, was detectable. This study gives interesting insights on the spatial processes driving community structure and a new prospective for biodiversity conservation. Since alpine MWBs have significant effects on the maintenance of watershed biodiversity, further research on such small and crucial ecosystems is encouraged. 展开更多
关键词 HABITAT CONNECTIVITY High MOUNTAIN Extreme fine scale Cascaded WATER system Richness maintenance Polarized dispersal
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续随子二酰甘油酰基转移酶2基因(ElDGAT2)克隆与功能分析 被引量:4
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作者 任国鹏 葛丽萍 +2 位作者 孙超超 刘宝玲 李润植 《植物生理学报》 CAS CSCD 北大核心 2019年第8期1156-1166,共11页
本文从续随子发育种子中分离编码二酰甘油酰基转移酶2的cDNA克隆(ElDGAT2),采用生物信息学工具解析ElDGAT2酶蛋白的理化性质、高级结构、亚细胞定位及系统发育等特性。利用qRT-PCR研究该基因在续随子不同器官组织的表达谱。构建ElDGAT2... 本文从续随子发育种子中分离编码二酰甘油酰基转移酶2的cDNA克隆(ElDGAT2),采用生物信息学工具解析ElDGAT2酶蛋白的理化性质、高级结构、亚细胞定位及系统发育等特性。利用qRT-PCR研究该基因在续随子不同器官组织的表达谱。构建ElDGAT2的组成型植物表达载体(pCAMBIA1303-ElDGAT2),通过农杆菌介导烟草瞬时表达鉴定ElDGAT2基因的功能。结果显示,续随子ElDGAT2cDNA全长1939bp,ORF为984bp,编码327个氨基酸。ElDGAT2蛋白定位于内质网上,二级结构主要结构元件为α-螺旋(37.00%)和无规则卷曲(34.25%)。DGAT2蛋白系统发育树分析揭示,续随子ElDGAT2与同科植物蓖麻、油桐、麻疯树的DGAT2蛋白亲缘关系较近。基因表达分析表明,ElDGAT2基因在续随子不同器官中均有表达,而且在种子中的表达量显著高于其他器官。在种子发育中期(花后30d)即油脂快速合成积累时期的表达量最高,ElDGAT2表达量约为叶片的12.83倍。与野生型和空载体转化烟叶相比,ElDGAT2瞬时表达的烟叶组织总油脂含量提高1.59%,饱和脂肪酸减少,油酸等不饱和脂肪酸增加。研究表明,ElDGAT2编码一个具有催化活性的DGAT2酶蛋白,异源表达可提高宿主组织总油脂和不饱和脂肪酸的合成积累,显示ElDGAT2对油酸等不饱和脂肪酸有底物偏好性。 展开更多
关键词 续随子 二酰甘油酰基转移酶2 基因克隆 表达谱 烟草瞬时表达
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