146. RATES OF RESPIRATION: ALGAE 



Respiration in plant tissue, as in animal tissue, involves both consumption of Og 

 and evolution of CO2. Gaseous exchange is measured by placing the tissue in a 

 calibrated chamber containing a gas mixture (O2 and COg) of known composition, 

 replenished if necesseiry, and determining the alteration in composition of the 

 mixture after a suitable time. Gas volvmies are expressed in cu imn of gas (at 

 S.T.P. ) per gram dry weight of plant material per hour. 



Species 



Temperature 



Carbon 



Dioxide 



Released 



cu mm 



/g/hr 



Oxygen 

 Absorbed 



cu mm 



/g/hr 



Respiratory 

 Quotient! 



iAL 



ill 



Icl 



IDI 



ill 



Cyanophyta (Blue -green) 



Anabaena sp. 



25 



U,500 



Chlorophyta (Green) 



2 Chlorella ellipsoidea 



3 C . pyxenoidosa 

 k Cladophora arcta 

 5 Enter omorpha linza 



h 

 Nitella clavata 



7 Scenedesmus obliquus 



8| Spirogyra sp.5 



Spirogyra sp." 



id Ulva lactuca 



11 



U. lactuca 



25^ 

 252,3 



12 



25 



23 



35 

 35 

 18.1 



25 



1,600-12,800 



260-610 

 1,530-2,190 

 1+72 



1,300 

 1,U00-11,200 



900 

 1,100 



20,000-30,000 



500 

 1,260-2,100 

 1,1+00-2,100 



493 



2,600 



1.1 



0.2-0.3 

 1.0 



0.9 



Phaeophyta (Brown) 



12 



13 

 Ik 



Ascophyllum nodosum 

 Fucus serratus 

 Laminajja phyllitis 



18.3 



165 



2,91+0 

 307 

 900 



0.5 



Rhodophyta (Red) 



Chondrus crispus 



Gigartina teedii 

 Polysiphonia violacea 



lU 



11.6 

 11.1 



1,031 



1+00 



1+1+0 

 891 



1.2 



/l/ Refers to the ratio of the volume of CO2 released to the volume of Og ab- 

 sorbed. /2/ Endogenous. /3/ In glucose solution: COg, 23,000; O2, 19,000. /k/ 

 Data applicable to plant tips. /5/ Data applicable to sexuail (conjugating) stage. 

 /6/ Data applicable to vegetative stage. 



239 



