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Giussani et al 2001
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Stowe and Teeri 1978
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Investigation 2 – Causes and consequences of energy and carbon dynamics in biological systems: Scaling from molecules to ecosystems
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allocation Biochem Anatomy Physiology
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Energy, matter, allocation, and growth in a vascular plant E C H2OH2O ions RGR
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What is RGR? [Mass time time t+1 – Mass time t ] [Mass time t · time interval] units? Time –1 meaning – RGR’s like an interest rate initial account sizeinterest rate d-1acct size in 100 d 100 0.05 = (105-100/100)100(1.05)100 = 13,150 100 0.06100(1.06)100 = 33,930 50 0.06 50(1.05)100 = 16,965 therefore RGR = good measure of size increase rate
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Cast of characters
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Where did the data come from? A)Biochemical traits 1)C3 v. C4 photosynthesis phylogeny of C4 traits in grass family
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Where did the data come from? A)Biochemical traits 2) Chlorophyll concentration Grind the 9 cm2 of leaf tissue in 9 ml of 80% acetone. Centrifuge at full speed for 5 min. Dilute supernatant to 10 ml with 80% acetone. Total chlorophyll mg/ml = 0.0202 A645 + 0.00802 A663 mg chlorophyll per gram fresh weight:= = [mg. chlor./ml X volume of extract (ml)] ÷ fresh weight (g)
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Where did the data come from? B) Leaf gas exchange 1)Photosynthetic rate 2)Respiration rate http://web.grinnell.edu/courses/bio/qubitmanual/Information/Respiration/intro.htm
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Where did the data come from? C) Resource allocation Root fraction Grow plants individually Initial harvest at 1 month clip shoots wash roots dry 48 h at 65°C weigh root wt / total wt
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Where did the data come from? D) Growth rate RGR Grow plants individually 2nd harvest 1 wk later unearth & wash dry 48 h at 65°C weigh RGR = (Mass final – Mass initial ) Mass initial wk
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Today’s plan 1)Take the variables in Table 1 groups create models depicting: A)Relationships among variables B)Controls of variation in RGR 2)Class creates consensus model. 3) Groups evaluate the model statistically, and hand in worksheets. 4) Class reviews findings and their lessons.
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C4 C3
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