Relative Growth Rate (RGR) - Plant Physiology

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

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

Relative Growth Rate (RGR) - Plant Physiology

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