不同温度和盐度条件对脆江蓠生长及其生化组分的影响

在不同温度（14℃、17℃、20℃、23℃和26℃）和不同盐度（5、10、15、20、25、30和35）条件下培养脆江蓠（Gracilaria chouae）,观察测定其生长及藻体生化组分的变化。试验结果显示,脆江蓠生长的适宜温度为14～26℃,最适温度为17～20℃,在此温度条件下藻体可以保持最快相对生长速率（relative growth rate,RGR）;温度高于20℃时脆江蓠的生长受到抑制。在生长状态、光合色素和抗氧化等方面,脆江蓠对低温的耐受能力要比高温强。脆江蓠生长的适宜盐度为20～35,最适盐度为30,在此盐度条件下藻体可以保持最快RGR,盐度低于20时脆江蓠的生长受到抑制。高盐度培养条件下脆江蓠在生长状态、光合色素和抗氧化等方面强于低盐度培养条件。

Effects of different temperature and salinity on growth and biochemical constituents of Gracilaria chouae

We study the effects of different temperature （ 14 ℃, 17 ℃, 20 ℃, 23 ℃ , 26 ℃ ） and salinity （5, 10, 15, 20, 25, 30, 35 ） on the growth and biochemical constituents of Gracilaria chouae. Results indicate that the appropriate temperature for its growth is 14 - 26 ℃ and optinmm is 17 - 20 ℃. Under 17- 20℃, G. chouae obtains maximal relative growth rate. But when the temperature is higher than 20 ℃ , the growth of G. chouae is inhibited. In addition, its tolerance to low temperature is better than that of high temperature in terms of growth performance, photosynthetic pigments and antioxidant enzymes. The appropriate salinity for its growth is 20-35 and optimum is 30. Under the salinity of 30, G. chouae obtains maximal relative growth rate. Its growth is inhibited when salinity is below 20. G. chottae treated with high salinity has better growth performance, photosynthetic pigment and antioxidant enzymes than that with low salinity.