BIOE 370 1st Edition Lecture 10 Outline of Last Lecture I. Source of Heat/ Types of RegulationA. WB and CBII.WB/CB Trade-OffsOutline of Current Lecture III. Requirements of PS B. + trade-offsIV. Trade-offs of adaptive evolutionV. LIAVI. Photosynthetic rateCurrent LecturePlants6CO2 + 12H2O + Light <--> C6H12O6 + 6O2 + 6H2OThe requirememnts of PS create 3 unavoidable trad-offs:1. Water loss through transpiration while in taking CO22. Photosynthetic rate + respiration3. Light + heat plant will overheatBoundary layer – layer of stationary air trapped next to the leafAdaptive evolution by natural selection shapes plants that optimize these trade-offs1. LAI – how much a plant is investing in leaves vs. below ground2. Individual leaf design3. Root/shoot allocationa. These adaptations determine distribution + abundance * photosynthesis occurs in palisademesophyl* Water imitation when potential evaporation (P.E.T) exceeds precipitation LIA – leaf area index- increased LIA increases photosynthesis - increased LIA increases transpiration- increased LIA increases respirationPhotosynthetic rate vs. LIA- Inverse exponential function- Net PP takes respiration into accountSaturation Pt vs. Compensation PtLower saturation = lower compensation Allocation of Energy- Root/shoot allocation- H2O/CO2
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