文章研究了2个龙须菜(Gracilaria lemaneiformis)品系981和07-2在3种温度(23℃、27℃和31℃)条件下的各个生理指标的变化情况.结果表明,龙须菜07-2品系的相对生长速率在23℃和27℃时呈上升趋势,31℃时略有下降;981龙须菜品系也呈先上升后下降趋势.07-2品系的叶绿素a(chlorophylls,Chl-a)和类胡萝卜素在23℃和27℃时均低于981龙须菜,31℃时基本持平;07-2品系的藻蓝蛋白(R-PC)呈上升趋势,但是差异不显著,藻红蛋白(R-PE)含量高于981龙须菜,且呈上升趋势;981龙须菜的各个光合色素在3个温度条件下均没有显著差异.07-2品系的超氧化物歧化酶(SOD)活性呈上升趋势,差异显著;981龙须菜的SOD活性略有上升,但差异不显著.在生长状态、光合色素和抗氧化酶等方面,07-2品系比981龙须菜更能表现出其耐高温的优越性.%The changes of physiological indices for 2 Gracilaria lemaneiformis strains (981 and 07-2) were studied at 23 ℃, 27 ℃2and 31 ℃, respectively. The results indicate that the relative growth rate of 07-2 increases at 23 ℃ and 27 ℃ while declines slightly at 31 ℃, and 981 shows a similar trend. The contents of chlorophyll and carotenoids in 07-2 are lower than those in 981 at 23 ℃2 and 27 ℃ but become stable at 31 ℃. The content of phycocyanin in 07-2 is on the rise but without significant difference; the content of phycoerythrin is higher than that in 981, showing an ascendant trend. At 3 different temperatures, the photosynthetic pigments in 981show no significant difference. The SOD activity in 07-2 shows an ascendant trend with significant difference while that in 981 increases slightly without significant difference. Therefore, 07-2 has better growth performance, photosynthetic pigment and antioxidant enzymes than 981, showing its advantage of high temperature resistance.
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