简介：Ｅｆｆｅｃｔｓｏｆｌｉｇｈｔ，ｔｅｍｐｅｒａｔｕｒｅａｎｄｎｕｔｒｉｅｎｔｓｏｎｐｈｏｔｏｓｙｎｔｈｅｓｉｓｏｆＢｉｄｄｕｌｐｈｉａｒｅｇｉａＩＮＴＲＯＤＵＣＴＩＯＮＬｉｇｈｔ，ｔｅｍｐｅｒａｔｕｒｅａｎｄｎｕｔｒｉｅｎｔｓａｒｅｉｍｐｏｒｔａｎｔｅ...

简介：Theeffectofbicarbonate(HCO3-)onthegrowthanddevelopmentofplantsvariesbyspecies.Tobetterunderstandinorganiccarbonandnitrogenassimilationchangesofkarst-adaptableplantsunderdifferentHCO3-treatments,weconductedexperimentsonseedlingsandinvitroplantletsofOrychophragmusviolaceus(Ov).Wefoundthatthevitalphotosynthesispotential(asmeasuredbynetphotosyntheticrate,actualphotochemicalefficiencyofphotosystem-Ⅱ,photochemicalquenchingcoefficient,andtheinstantaneouscarbonisotoperatioof3-phosphoglycerate)wasconsistentunderdifferentHCO3-treatmentsofOv.Bicarbonate’slackofeffectoncarbonassimilationofOvmayberelatedtocarbonicanhydraseinOvconvertingHCO3-toH2OandCO2.Inthisway,OvcouldpreventHCO3-iontoxicityandhighpHfromharmingitsgrowthanddevelopmentunderHCO3-stress.ThisstudyalsofoundthathighHCO3-concentrationscouldpromotenitrogenassimilationandutilizationofOvthroughchangesinrelatedindexes(foliarnitrogenisotopefractionationratio,stablenitrogenisotopeassimilationratio,foliarstablenitrogenisotopefractionation,nitratenitrogenutilizationefficiency,andnitrateutilizationshare)underdifferentHCO3-treatments.BicarbonatehasdifferenteffectsonphotosynthesisandoninorganicnitrogenassimilationofOv,whichmaybeconnectedtophotosynthesisprovidingelectronsfornitrate/nitritereductionthroughthephotosyntheticchain.

简介：海水咸度被潮，蒸发和雨下降极大地影响。在这研究，我们调查了生长和对的导出接合子的UlvafasciataDelilegermlings的光合的回答短期(分钟)并且延长(天)暴露到不同咸度坡度，在这棵海草在生活历史的早阶段上评估咸度变化的效果。结果显示出那，最大的网U的光合的率(NPRm)。fasciatagermlings显著地被减少在脱盐(25和15)并且在短期的暴露测试的高度(45)咸度海水(在分钟)。在30min以后，然而，在中等咸度(25)的光合作用活动在相对高水平被维持(超过70%)。在8d延长了文化以后，光合作用和germlings的吝啬的相对生长率(RGR)都显著地被降低，而malondialdehyde(MDA)内容作为从34～15脱盐的咸度增加了。从34～25的咸度减少没在RGR上有重要效果，但是显然影响了germlings的形态学。高咸度水平(45)显著地压抑U的RGR和光合作用。fasciatagermlings，当它显著地增加了MDA内容时。结果比咸度减少证明咸度举起在Ulvafasciatagermlings上有更有害的效果。在咸度海水种的germlings从25～34铺平，在暂时、延长的文化两个都执行了更好的光合的环境适应。在U的从25～34的宽广咸度忍耐。fasciatagermlings可能部分作为对的回答演变常规日报潮。

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简介：在在与银叶白色的关系的光合作用和可溶的碳水化物含量飞的棉花(GossypiumhirsutumL.)上种日期和氮授精的影响，Bemisiatabaci(Gennadius)遗传因子型“B”，人口在地实验被检验。在迟了的4月和早6月的Cottonplanted用尿素肥料在土壤与0,112,168和224kg/N公顷被对待。种4月的棉花的吝啬的光合的率是4%—20%高在季节晚比种6月的棉花的比在季节，而是10%-18%早的种6月的棉花的降低。为两个都种日期的光合的率断然与增加的氮的层次被相关。当为两个都种日期的葡萄糖的层次断然与氮层次被相关时，fructose和蔗糖层次不是。当蔗糖的更高是多达59%时，fructose的层次在to40%上面的平均数降低，在比在June-plantedcotton的种4月的棉花。光合的率或有气孔的传导力的层次没被相关与adultwhitefly，为种的任何一个的密度标明日期。葡萄糖和fructose的层次断然在季节晚仅仅为种6月的棉花与白苍蝇密度被相关。

简介：Intertidalmarinemacroalgaeexperienceperiodicalexposuresduringlowtideduetotheirzonationaldistribution.ThedurationofsuchemersionleadstodifferentexposuresoftheplantstolightandaerialCO2,whichthenaffectthephysiologyofthemtodifferentextents.TheecophysiologicalresponsestolightandCO2wereinvestigatedduringemersionintworedalgaeGloiopeltisfurcataandGigartinaintermedia,andtwobrownalgaePetaloniafasciaandSargassumhemiphyllum,growingalongtheShantoucoastofChina.Thelight-saturatednetphotosynthesisinG.furcataandP.fasciashowedanincreasefollowedbyslightlydesiccation,whereasthatinG.intermediaandS.hemiphyllumexhibitedacontinuousdecreasewithwaterloss.Inaddition,theupper-zonatedG.furcataandP.fascia,exhibitedhigherphotosynthetictolerancetodesiccationandrequiredhigherlightleveltosaturatetheirphotosynthesisthanthelower-zonatedG.intermediaandS.hemiphyllum.Desiccationhadlesseffectondarkrespirationinthesefouralgaecomparedwithphotosynthesis.Thelight-saturatednetphotosynthesisincreasedwithincreasedCO2concentrations,beingsaturatedatCO2concentrationshigherthanthepresentatmosphericlevelinG.furcata,G.intermediaandS.hemiphyllumduringemersion.ItwasevidentthattherelativeenhancementofphotosynthesisbyelevatedCO2inthosethreealgaeincreased,thoughtheabsolutevaluesofphotosyntheticenhancementowingtoCO2increasewerereducedwhenthedesiccationstatusesbecamemoresevere.However,inthecaseofdesiccatedP.fascia(waterlossbeinggreaterthan20%),lightsaturatednetphotosynthesiswassaturatedwithcurrentambientatmosphericCO2level.ItisproposedthatincreasingatmosphericCO2willenhancethedailyphotosyntheticproductioninintertidalmacroalgaebyvariedextentsthatwererelatedtothespeciesandzonation.