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Relative Growth Rate Presentation by Zach Jarou
Literature Reviewed ,[object Object],[object Object],[object Object],[object Object]
Cellular Basis of Growth ,[object Object],[object Object],[object Object],Lambers 2008
Intro to Growth Analysis ,[object Object],[object Object],Hunt 2002
Keeping it in Context ,[object Object],[object Object],[object Object],[object Object],Lambers 2008
First Thoughts ,[object Object],[object Object],Blackman 1919
Blackman’s Equation “ Apart from any question of autocatalysis it is obvious that the increase in size of the assimilating surface of the young plant must constantly accelerate the rate of growth, and that the consideration of this acceleration is essential for the proper comparison of the final weight of different plants and of the same plants grown for different periods.” “ The rate of interest (r of the equation) is clearly a very important physiological constant. It represents the efficiency of the plant as a producer of new material, and gives a measure of the plant’s economy in working.” Blackman 1919
Blackman Summary ,[object Object],[object Object],Blackman 1919
Ultimate Dry Weight Determinants ,[object Object],[object Object],[object Object],[object Object],Blackman 1919
Physiological Basis? ,[object Object],[object Object],[object Object],Blackman 1919
Types of Analyses ,[object Object],[object Object],Lambers 2008 RGR = LAR x NAR
Types of Analyses Lambers 2008
LAR Components ,[object Object],[object Object],[object Object],Lambers 2008 LAR = SLA x LMR
NAR Components ,[object Object],Lambers 2008
Underlying Processes ,[object Object],Lambers 2008
Underlying Processes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LAR Variation  (SLA & LMR) ,[object Object],[object Object],[object Object],[object Object],Lambers 2008
LAR Variation Lambers 2008
NAR Variation ,[object Object],[object Object],[object Object],Lambers 2008
NAR Variation Lambers 2008 Next to the variation in LAR (SLA and LMR), this difference in the amount of carbon required for respiration is the second-most important factor that is associated with inherent variation in RGR.”
RGR 2.0 (Used as a Tool) ,[object Object],[object Object],Tholen 2004
RGR 2.0 ,[object Object],Tholen 2004
ULR replaces NAR ,[object Object],[object Object],[object Object],Tholen 2004
Calculating ULR ,[object Object],Tholen 2004
Calculating ULR ,[object Object],Tholen 2004 The ULR depends on (1) photosynthesis per unit leaf area (PS A ; mol C fixed m -2  leaf area d -1 ); (2) fraction of daily fixed carbon that is not respired but incorporated into the biomass of a plant (FCI; mol C incorporated mol -1  C fixed); and (3) the amount of biomass that can be formed with 1 mol carbon, referred to by the carbon concentration ([C]; mol C g -1  dry mass).
SLA Revisted ,[object Object],[object Object],[object Object],[object Object],Tholen 2004
SLA & ULR ,[object Object],[object Object],Tholen 2004
Growth Analysis Tool ,[object Object],RGR  = LWF SLA  x ULR  x Hunt 2002
Simple Excel Worksheet “ The tool is liberally supplied with drop-down comments explaining and advising on each part of the procedure … In any or all of these dimensions, the units selected for the outputs may differ from those used for the inputs (the tool will perform the appropriate conversions).” Hunt 2002
FAQs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Hunt 2002
FAQs ,[object Object],[object Object],[object Object],[object Object],Hunt 2002
Questions?

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Relative Growth Rate (RGR) - Plant Physiology

  • 1. Relative Growth Rate Presentation by Zach Jarou
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  • 7. Blackman’s Equation “ Apart from any question of autocatalysis it is obvious that the increase in size of the assimilating surface of the young plant must constantly accelerate the rate of growth, and that the consideration of this acceleration is essential for the proper comparison of the final weight of different plants and of the same plants grown for different periods.” “ The rate of interest (r of the equation) is clearly a very important physiological constant. It represents the efficiency of the plant as a producer of new material, and gives a measure of the plant’s economy in working.” Blackman 1919
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  • 12. Types of Analyses Lambers 2008
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  • 20. NAR Variation Lambers 2008 Next to the variation in LAR (SLA and LMR), this difference in the amount of carbon required for respiration is the second-most important factor that is associated with inherent variation in RGR.”
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  • 29. Simple Excel Worksheet “ The tool is liberally supplied with drop-down comments explaining and advising on each part of the procedure … In any or all of these dimensions, the units selected for the outputs may differ from those used for the inputs (the tool will perform the appropriate conversions).” Hunt 2002
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