322
T.G.A. Green and O.L. Lange
16.2.2 Compensation Points and Photorespiration
Bryophyte photosynthesis appears similar in several respects to that of C 3
higher plants. Carbon isotope ratios (a13C from - 24 to -35%0, Rundel et al.
1979; Teeri 1981) fall within the range expected for C 3 plants and bicar2oo~--------------------~
,....
~
'(ij
-.>
'8150
... ::I..
......
- c
' 8, 100
c
o
:;:
ell
en
~ 50
0.
E
o
()
A
- 0
C en
0._
:;:en
;e~
.&:o
80
60
40
cC
.- >cen 20
al°
01>-0
)(.&:
00. 0
* -20 0
B
10
20
30
40
Temperature (OC)
10
20
30
40
Temperature (OC)
Fig. 16.1A,B. The influence of oxygen concentration (2 and 21%) and temperature on:
top panel CO2 compensation point, 2% oxygen solid symbols; 21 % oxygen open symbols;
and lower panel oxygen inhibition of A, for Marchantia berteroana. Carbon dioxide
exchange was determined with a closed-loop gas-exchange system as described in Green
and Snelgar (1981a)