细胞大小对浮游植物影响课件

1、Cell size trade-offs govern light exploitation strategies in marine phytoplanktonEnvironmental Microbiology（2010）2015.12.9Background Material and MethodResults and Discussion Conclusion Background small cells have higher metabolic ratesb = 3/4stablevariablesmalllarger?Background lightphotoinactivati

2、onmetabolic replacementphotosynthesisphoto-inhibitionBackground photoinactivationmetabolic replacementlight-harvestingcell sizetrade-offMaterial and MethodCCMP1014 ,CCMP1335,CCMP1010, CCMP2063, CCMP1583, CCMP312 ,CCMP2513 Condition:Cultures:K medium 22 1Sample：Mid-exponentialPSIIiRPSIIiRPSIIResults

3、and Discussion 1. cell size scaling of PSII b= 0.54b= 0.8larger cells contain lower intracellular concentrations than small cells Results and Discussion 1. cell size scaling of PSII The larger cells allocate more nitrogen to PSIIResults and Discussion 1. cell size scaling of PSII large diatoms have

4、a lower light-harvesting capacity sizeResults and Discussion 2. cell size scaling of i PSII in larger cells is less susceptible to photoinactivationResults and Discussion 3. cell size scaling of PSII electron transport and repair rate small cells have greater metabolic capacity for photosynthesis an

5、d RPSIIResults and Discussion 4. cell size alters net responses to light fluctuationssmall diatomlarge diatomResults and Discussion 4. cell size alters net responses to light fluctuations The small diatoms rely heavily on rapid RPSII The larger diatoms rely on their low susceptibility to photoinacti

6、vationResults and Discussion 5. taxonomic differencesdiatoms were well adapted to mixed layer regimes Conclusion iPSIIRPSIISmaller diatoms dominate under steady-state conditions.Larger diatoms dominate under variable environmental conditions.the relative importance of these factors (different irradiance, temperature and nutrient concentrations)Conclusion new framework to