EMPIRICAL PLANT SPECTRA 



689 



(f) 



o 



Chlorella 

 (Emerson 

 and Lewis) 



-1.4 - 



Sphere 



400 500 600 700 



WAVE LENGTH, m;i 



800 



400 500 600 700 



WAVE LENGTH, m/i 



800 



Fig. 22.16. Leaf and chloroplast absorption spectra (on a log density basis and ad- 

 justed to the same height at 670 m/u.) (after Rabideau, French and Holt 1946). The 

 Beckman curve of the chloroplastin solution (chloroplasts disintegrated by supersonics) 

 is an / - T plot (;'. e., it represents absorption plus scattering); the Ulbricht sphere 

 curve is an / — T — R plot (pure absorption). An absorption curve of Chlorella (after 

 Emerson and Lewis) and a photosynthesis action curve (after Hoover et al.) are given 

 for comparison. 



g 

 en 



if) 

 z 

 < 

 a: 



100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 

 10 



100 





 400 



700 



500 600 



WAVE LENGTH, m/i 



Fig. 22.17. Transmission spectra 

 of water plants (after Seybold 1934). 



a. 

 o 



CQ 

 < 



O 





CO 



en 



en 



z 

 < 

 cr 



H 



500 600 700 



WAVE LENGTH, m/i 



Fig. 22.18. Transmission T, absorp- 

 tion A and reflection R by green alga 

 Monostroma. Absorption curve D of red 

 alga Delesseria given for comparison 

 {cf. fig. 22.20) (after Seybold 1934).* 



* For an absorption curve of Ulva lactuca and its extracted pigments, see Seybold 

 and Weissweiler (19430- 



