
TY  - JOUR
A1  - Griffiths, DJ 
A1  - Thinh, L 
T1  - Transfer of photosynthetically fixed carbon between the prokaryotic green alga <I>Prochloron</I> and its ascidian host
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 1983
VL  - 34
IS  - 3
SP  - 431
EP  - 440
KW  - 
UR  - https://doi.org/10.1071/MF9830431 
N2  - In the symbiotic association between the prokaryotic green alga Prochloron and three didemnid host species (Diplosoma similis, Lissoclinum bistratum, Trididemnum cyclops), between 6 and 51 % of the total carbon fixed during exposure for 1 h to H14CO3- in the light (150 µE m-2 s-1) becomes associated with the host tissue. Dark fixation of 14CO2 in these ascidian species and in Lissoclinum punctatum never exceeds 6% of photosynthetic fixation at saturating light intensity. The corresponding values for dark fixation of 14CO2 in isolated Prochloron cells fall within the same range. There is very little excretion of photosynthate from whole colonies of the above ascidian species nor from Didemnum molle, Lissoclinum voeltzkowi and Trididemnum miniatum (usually less than 1 % of total photosynthate at saturation light intensity), suggesting an efficient transfer mechanism from Prochloron to host. Evidence from pulse-chase experiments suggests that transfer probably involves the early products of photosynthesis. The extent of transfer of photosynthate between Prochloron and T. cyclops varies with the rate of photosynthetic 14CO2 fixation into the whole colony but there is some transfer even at low light intensities, which strongly limit photosynthesis. 
ER  -

