低温对氯化钠胁迫下蓝藻固氮活性的影响

EFFECT OF LOW TEMPERATURE ON NITROGENFIXING ACTIVITY OF BLUE-GREEN ALGAE ANABAENA 7120 UNDER SODIUM CHLORIDE

摘要:

低温加剧氯化钠对蓝藻固氮的抑制,营养液中氯化钠浓度增高时,抑制程度更甚.能源受限(暗处理和加抑制剂时的光合受抑,N_2和Ar的厌氧下呼吸代谢受阻)和氧下固氮酶受到伤害时,低温处理使氯化钠对蓝藻固氮的抑制进一步加剧.在能源和还原剂供应,合成固氨酶蛋白的物质基础(如CO_2和N_2的加合).光合作用正常进行的条件得到改善和保证,以及供应CO_2、外源蔗糖和氮氧加合时,低温加剧氯化钠对蓝藻固氮的抑制程度明显变小.

Abstract:

The nitrogen-fixing activity of blue-green algae Anabaena 7120 treated by low temperature was markedly declined with increase of NaCl concentration in medium under NaCl stress. When the preincubation of the algae cells was done in dark before experiment for 24 hours or in presence of photosynthetic inhibitors, such as DNP and CCCP, a synergetic great inhibition of nitrogen-fixing activity of Anabaena treated by low temperature under NaCl stress was observed. Nitrogen-fixing activity of Anabaena influenced b...