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20℃条件下,研究了6个不同海水铁含量处理[23(自然海水,对照)、100、300、500、700、900μg·L-1]对海头红(Plocamium telfairiae)相对生长速率、藻胆蛋白含量及过氧化物酶和固氮酶活力的影响,分析了海头红的海水铁含量适宜性。结果表明:经30 d培育实验,海水铁含量为100μg·L-1处理组海头红的相对生长速率(RGR)达到最大值(1.14%·d-1),极显著高于其他海水铁含量处理组(P<0.01),而海水铁含量为300~900μg·L-1处理组海头红的RGR在0.26~0.34%·d-1,与对照组无明显不同(P>0.05);海头红3种藻胆蛋白含量均随海水铁含量的增加呈先增加后缓慢下降的变化趋势,并于100μg·L-1时达到最大值,海头红过氧化物酶活力亦在海水铁含量100μg·L-1条件下达到最高值(14.5U·mg-1),显著高于其他处理组(P<0.05),但不同海水铁含量对海头红固氮酶活力无显著影响(P>0.05)。适宜性分析表明,在设定的5个海水富铁处理中,100μg·L-1铁含量对海头红的促生长作用最显著。
Under the conditions of 20 ℃, the relative growth rate of 6 treatments with different seawater iron concentrations [23 (natural sea water, control), 100, 300, 500, 700 and 900 μg · L -1] on the growth of Plocamium telfairiae, And the activities of peroxidase and nitrogenase were analyzed. The suitability of iron content in seawater red seawater was analyzed. The results showed that the maximum relative growth rate (RGR) reached the maximum (1.14% · d-1) in the seawater red treated with 100 μg · L-1 seawater for 30 d, which was significantly higher than that of other seawater (P <0.01). However, the RGR was 0.26 ~ 0.34% · d-1 in seawater red with 300 ~ 900μg · L-1 seawater treatment, which was not significantly different from the control group (P> 0.05) The content of phycobiliproteins of the three red gobs increased firstly and then slowly decreased with the increase of iron content in seawater and reached the maximum value at 100 μg · L-1. The activity of Hetuoperoxidase also increased with the iron content in seawater (P> 0.05). However, iron content in different seawater had no significant effect on the activity of red nitrogenase (P> 0.05) ). Suitability analysis showed that the iron content of 100μg · L-1 had the most significant effect on the growth of Hedy Red in the five iron-rich seawater treatments.