Cu^(2+)对鼠尾藻幼孢子体生长的影响

Effect of Cu^(2+) on growth of Sargassum thunbergii young sporophyte

以鼠尾藻Sargassumthunbergii幼孢子体为材料,研究了Cu2+对不同生长时期的鼠尾藻幼孢子体生长的影响。不同生长时期的鼠尾藻幼孢子体对微量Cu2+都是敏感的。对于早期的鼠尾藻幼孢子体,5μg/L以上浓度的Cu2+对其正常生长不利;当Cu2+浓度达到或超过250μg/L时,该时期幼孢子体基本停止生长。对于后期的鼠尾藻幼孢子体,10μg/L以上浓度的Cu2+对其正常生长不利;1μg/L浓度的Cu2+对其生长有促进作用;当Cu2+浓度达到或超过50μg/L时,该时期幼孢子体增长缓慢或基本停止生长。鼠尾藻幼孢子体的假根由于结构和功能特性,对Cu2+的敏感程度不大,Cu2+处理初期依然表现出快速增长。

The effect of Cu2＋ on the growth of Sargassum thunbergii young sporophyte at different growth stage was investigated.It was found that during both the early and late stages the young sporophyte were very sensitive to Cu2＋ treatment.Growth of S.thunbergii young sporophyte during the early stage was seriously inhibited by Cu2＋ at concentrations of 5 μg/L and above,and the growth was almost terminated by Cu2＋ at 250 μg/L and above.For S.thunbergii young sporophyte at the late stage,the growth was seriously inhibited by Cu2＋ at 10 μg/L and above.The growth of young sporophytes was accelerated by 1 μg/L Cu2＋,but slower or even ceased growth was observed at more than 50 μg/L Cu2＋ treatments.Due to the special characteristics of structure and function,rhizoid of S.thunbergii young sporophyte was found to be insensitive to Cu2＋.At the beginning of Cu2＋ treatment,rhizoid still presented fast growth.