Intracellular phosphorus metabolism and growth of <Emphasis Type="Italic">Microcystis aeruginosa</Emphasis> in dark/light cycles under various redox potential difference conditions

Phosphorus metabolism and growth of M. aeruginosa were studied under three different conditions of diel fluctuation in redox potential. Redox potential in the culture increased in light and decreased in dark in all treatments except one, when cysteine was added in darkness. Total phosphorus content in M. aeruginosa decreased in darkness and increased in light during exponential growth but increased continuously in the stationary phase. Conversely, polyphosphate (PolyP) accumulated in darkness but was lost in the light. Low redox potential in darkness promoted PolyP accumulation. Polyglucose and soluble orthophosphate may provide energy and phosphorus, respectively, for PolyP synthesis. PolyP was important to M. aeruginosa survival during poor growth conditions. If the redox potential difference in the dark/light cycle was large, M. aeruginosa initially grew faster, but soon lost viability.     

西红花FT同源基因的表达及功能分析

FT（FLOWERING LOCUS T）及其同源基因作为三大开花途径整合子之一,被认为是调控植物开花的重要基因。为了深入研究FT同源基因的功能以及西红花（Crocus sativus L.）开花的分子机理,对已报道的3个西红花FT同源基因（CsatFT1、CsatFT2和CsatFT3）进行分离及分析。gDNA包含长度分别为835、1 642和1 132 bp的完整开放阅读框（ORF）,均具有4个外显子和3个内含子;cDNA包含长度分别为528、525和540 bp的ORF,分别编码175、174和179个氨基酸;系统进化分析表明,CsatFT1、CsatFT2、CsatFT3分别和同为单子叶植物的水仙（Narcissus chinensis）NtFT、麝香百合（Lilium longiflorum）LlFT和洋葱（Allium cepa）AcFT1表现出较近的遗传距离。qRT-PCR分析结果显示,小球茎膨大阶段前期,CsatFT1、CsatFT2、CsatFT3在叶片中表达水平最高,侧根中次之,子球茎、主根中极低几乎检测不到;小球茎膨大阶段后期,CsatFT1、CsatFT2、CsatFT3都在子球茎中表达水平较高,在顶芽中几乎检测不到;室内储藏开花阶段,CsatFT1、CsatFT2、CsatFT3在柱头中表达水平最高,叶中次之,花瓣和花药中较低几乎检测不到。通过观测转基因烟草（Nicotiana tabacum）和转基因拟南芥（Arabidopsis thaliana）植株表型发现,CsatFT1,CsatFT2和CsatFT3均具有促进植物提早开花的功能。     

LED Light Quality Affect Growth,Alkaloids Contents,and Expressions of Amaryllidaceae Alkaloids Biosynthetic Pathway Genes in Lycoris longituba

Journal of Plant Growth Regulation - Lycoris longituba is an important ornamental and medicinal plant and contains various Amaryllidaceae alkaloids such as galanthamine (GAL), lycorine (LYC), and...     

不同光周期对西红花开花和花丝品质的效应比较

为筛选促进西红花开花和提高花丝品质的最佳光周期,以3种不同规格(20～25 g、25～30 g、30～35 g)西红花种球为材料,设置4种光周期处理(8 h/16 h、10 h/14 h、12 h/12 h、14 h/10 h),考察光周期对西红花种球鲜重变化、主芽生长、展叶数量、开花后营养物质含量以及花朵性状和花丝品...