杜氏盐藻对海水中无机碘(IO_3^-与I^-)的调控  

Inorganic iodine(IO_3^- and I^-) variation in the Dunaliella tertiolecta cultures under different iodine concentrations

作　　者：党爱翠[1] 陈绍勇[2] 龙爱民[1] 

机构地区：[1]中国科学院南海海洋研究所热带海洋环境国家重点实验室,广东广州510301 [2]中国科学院广州地球化学研究所,广东广州510640

出　　处：《海洋环境科学》2012年第6期813-816,共4页Marine Environmental Science

基　　金：国家自然科学基金(40876039);国家科技基础性项目(2008FY110100)

摘　　要：研究了杜氏盐藻(Dunaliella tertiolecta)在不同碘浓度条件下的生长状况及其对无机碘形态(IO3-和I-)的调控能力。结果表明:提高至天然值15倍的IO3-浓度不仅不会抑制杜氏盐藻的生长,反而稍有促进作用,但并不能单纯地归因于提供了更充足的碘源;两种碘浓度条件下均观测到IO3-的消耗,并且在指数生长期几乎都是线性下降,但Level 2比Level 1显著得多,并且伴随着明显的I-的累积;两种碘浓度条件下杜氏盐藻均在藻细胞数增长最快的时段明显吸收I-;Level 2中IO3-的消耗和I-的生成与杜氏盐藻所处的生长阶段有关,平台期内消耗(生成)速率更大。实验结果显示杜氏盐藻具备导致表层海洋中IO3-的亏损的能力。两种碘浓度条件下均有溶解有机态、颗粒态或气态碘生成。The growth and the ability of Dunaliella tertiolecta under different iodine concentrations were studied. Unnaturally high IO3^- concentration showed no inhibition on the growth of D. tertiolecta. In both Level 1 and Level 2 cultures, D. tertiolecta showed I^- uptake in late exponential phase, and IO3^-concentrations were linearly decreased in exponential phase, but only Level 2 cultures showed appar-ent I^- accumulation. In Level 2 cultures, IO3^- （I^-） decreased （increased） much rapidly in stationary phase than in exponential phase. The results showed that D. tertiolecta had the ability to partially depleted IO3^- in the surface ocean, and produced other forms of iodine, i. e. , dissolved organic iodine, particulate iodine and volatile iodine.

关 键 词：杜氏盐藻 IO3^- 消耗 I^-累积 碘缺失 

分 类 号：P734.21[天文地球—海洋化学]