雨生红球藻3个株系的生长及对光盐反应初探

对雨生红球藻3个株系（No.3、No.712和No.797)的生长、对诱导虾青素形成的光盐因子的反应进行了比较，结果表明：No.3、No.712和No.797的生长速率分别为0．128d^-1,0.137d^-1和0.144d^-1；外加盐的量较大（4gL^-1)时导致雨生红球藻细胞数的减少，而外加盐浓度较低（2gL^-1)时，细胞数的反应因株系和光照的不同而有所差异；盐和强光照均导致静细胞比例显著增加；盐的加入仅在弱光照下诱导雨生红球藻3个株系的虾青素累积，在强光照下却导致件株系虾青素含量的下降，强光照下不外加盐时No.3、NO.712和No.797藻液的虾青素含量无显著差异，分别为2.15、2.77和2．45mg L^-1。图1表2参12

STUDY ON DIFFERENCES IN GROWTH AND RESPONSES TO ILLUMINATION AND SALT OF THREE HAEMATOCOCCUS PLUVIALIS STRAINS

Growth and responses to two astaxanthin-inducing factors, illumination and salt, were compared among three strains of Haematococcus pluvialis (strains No.3, No.712 and No.797). The growth rates of strains No.3, No.712 and No.797 were 0.128 d -1, 0.137 d -1 and 0.144 d -1, respectively. The additional high salt concentration of 4 g L -1 resulted in the decrease in cell numbers of the three strains, while different responses of cell numbers to low salt concentration of 2 g L -1 were observed different in different strains and under different illumination levels. The ratios of static cell significantly increased with addition of salt and under high illumination level (E=12 000 lx). Salt induced the astaxanthin accumulation in the three strains only under low illumination level (E=1 200 lx). On the contrary, salt decreased the astaxanthin accumulation in the three strains under high illumination level (E=12 000 lx). Without exogenous salt and under high illumination level, astraxanthin concentrations of strains No.3, No.712 and No.797 were not significantly different, and were 2.15, 2.77 and 2.45 mg L -1, respectively. Fig 1, Tab 2, Ref 12