School of biological sciences, University of Sydney, 2006, NSW, Australia.
Planta. 1981 Mar;151(3):281-8. doi: 10.1007/BF00395181.
The giant-celled alga Griffithsia monilis has a low light compensation point and saturates photosynthesis at 60-90 μmol photons m(-2)s(-1) (oxygen evolution and CO2 fixation). Under dark and low light intensities (14)C is preferentially incorporated into amino acids (mainly aspartate and alanine). With increasing light a gradual change was observed and, under light saturation, compounds of the anionic fraction (digeneaside and hexosephosphates) were the most strongly labeled compounds, together with the amino acids glycine and serine. To a large extent (30-40% of the total) (14)C was fixed into EtOH-insoluble products, the hydrolysates of which consisted mainly of glucose and mannose. In the steady state the rates of photosynthesis and respiration decreased with increasing salinity. Changes in the rates after hyperosmotic shocks were less severe in cells adapted to high salinities. Photorespiration exists in Griffithsia: Glycine and serine are the major labeled compounds in O2-saturated media.
巨细胞藻 Griffithsia monilis 的光补偿点较低，在 60-90 μmol 光子 m(-2)s(-1)（氧气产生和 CO2 固定）下达到光合作用饱和。在黑暗和低光强下（14)C 优先掺入氨基酸（主要是天冬氨酸和丙氨酸）。随着光强的增加，观察到逐渐的变化，在光饱和下，阴离子部分的化合物（双基因酸和己糖磷酸）与氨基酸甘氨酸和丝氨酸一起是标记最强的化合物。在很大程度上（占总量的 30-40%）（14)C 被固定到乙醇不溶性产物中，其水解产物主要由葡萄糖和甘露糖组成。在稳定状态下，光合作用和呼吸作用的速率随着盐度的增加而降低。适应高盐度的细胞中，渗透压冲击后速率的变化不那么严重。光呼吸存在于 Griffithsia 中：在 O2 饱和介质中，甘氨酸和丝氨酸是主要的标记化合物。
