The newly described chrysophyte,Mallomonas vietnamica,is reported for the first time in China from specimens collected in Guizhou Province,SW China.The morphological characteristics were studied using light and scanni...The newly described chrysophyte,Mallomonas vietnamica,is reported for the first time in China from specimens collected in Guizhou Province,SW China.The morphological characteristics were studied using light and scanning electron microscopy.The species was described based on morphological characteristics,including cell size,scale size,dome,V-rib,and bristles.Subsequently,molecular sequencing of M.vietnamica was conducted and a phylogenetic tree was constructed based on concatenated SSU,LSU,and rbc L sequences.The phylogenetic tree led us to suggest raising a new section named Uncatusipedae for this species.This study provides new molecular data from the genus Mallomonas and enriches our understanding of the species diversity and geographical distribution of the genus Mallomonas in China.展开更多
lsochrysis zhangfiangensis is a potential marine microalga for biodiesel production, which accumulates lipid under ni- trogen limitation conditions, but the mechanism on molecular level is veiled. Quantitative real-ti...lsochrysis zhangfiangensis is a potential marine microalga for biodiesel production, which accumulates lipid under ni- trogen limitation conditions, but the mechanism on molecular level is veiled. Quantitative real-time polymerase chain reaction （qPCR） provides the possibility to investigate the gene expression levels, and a valid reference for data normalization is an essential prerequisite for firing up the analysis. In this study, five housekeeping genes, actin （ACT）, α-tubulin （TUA）, β-tubulin （TUB）, ubiquitin （UBI）, 18S rRNA （18S） and one target gene, diacylglycerol acyltransferase （DGAT）, were used for determining the reference. By analyzing the stabilities based on calculation of the stability index and on operating the two types of software, geNorm and bestkeeper, it showed that the reference genes widely used in higher plant and microalgae, such as UBI, TUA and 18S, were not the most stable ones in nitrogen-stressed 1. zhangjiangensis, and thus are not suitable for exploring the mRNA expression levels under these experi- mental conditions. Our results show that ACT together with TUB is the most feasible internal control for investigating gene expres- sion under nitrogen-stressed conditions. Our findings will contribute not only to future qPCR studies of/. zhangfiangensis, but also to verification of comparative transcriptomics studies of the microalgae under similar conditions.展开更多
基金Supported by the National Natural Science Foundation of China(Nos.32270220,U22A20445 to Jia FENG)the Excellent Achievement Cultivation Project of Higher Education in Shanxi(No.2020KJ029)。
文摘The newly described chrysophyte,Mallomonas vietnamica,is reported for the first time in China from specimens collected in Guizhou Province,SW China.The morphological characteristics were studied using light and scanning electron microscopy.The species was described based on morphological characteristics,including cell size,scale size,dome,V-rib,and bristles.Subsequently,molecular sequencing of M.vietnamica was conducted and a phylogenetic tree was constructed based on concatenated SSU,LSU,and rbc L sequences.The phylogenetic tree led us to suggest raising a new section named Uncatusipedae for this species.This study provides new molecular data from the genus Mallomonas and enriches our understanding of the species diversity and geographical distribution of the genus Mallomonas in China.
基金supported by the Hundred Talent Program of the Chinese Academy of Sciences (No.A1097)National High Technology Research and Development Program ‘863’ (2012AA052101)+2 种基金Liaoning Provincial Natural Science Foundation (2012010263)Knowledge Innovation Programs of Dalian Institute of Chemical Physics,CAS (K2010A13)China Postdoctoral Science Foundation Funded Project (2014M551139)
文摘lsochrysis zhangfiangensis is a potential marine microalga for biodiesel production, which accumulates lipid under ni- trogen limitation conditions, but the mechanism on molecular level is veiled. Quantitative real-time polymerase chain reaction （qPCR） provides the possibility to investigate the gene expression levels, and a valid reference for data normalization is an essential prerequisite for firing up the analysis. In this study, five housekeeping genes, actin （ACT）, α-tubulin （TUA）, β-tubulin （TUB）, ubiquitin （UBI）, 18S rRNA （18S） and one target gene, diacylglycerol acyltransferase （DGAT）, were used for determining the reference. By analyzing the stabilities based on calculation of the stability index and on operating the two types of software, geNorm and bestkeeper, it showed that the reference genes widely used in higher plant and microalgae, such as UBI, TUA and 18S, were not the most stable ones in nitrogen-stressed 1. zhangjiangensis, and thus are not suitable for exploring the mRNA expression levels under these experi- mental conditions. Our results show that ACT together with TUB is the most feasible internal control for investigating gene expres- sion under nitrogen-stressed conditions. Our findings will contribute not only to future qPCR studies of/. zhangfiangensis, but also to verification of comparative transcriptomics studies of the microalgae under similar conditions.
