不同无机盐对柱胞鱼腥藻固氮作用的影响  

Effects of Different Inorganic Salts on N 2-Fixation in a Blue-green Alga Anabaena Cylindrica

作　　者：易平[1] 郭厚良[1] 

机构地区：[1]武汉大学生命科学学院

出　　处：《湖北农学院学报》1998年第4期343-346,共4页Journal of Hubei Agricultural College

基　　金：国家自然科学基金

摘　　要：低渗水平浓度（０．０５ｍｏｌ／Ｌ）的ＮａＣｌ，ＣａＣｌ２和ＭｇＣｌ２对柱胞鱼腥藻（Ａｎａｂａｅｎａｃｙｌｉｎｄｒｉｃａ）固氮活性有刺激作用，ＮａＣｌ的刺激作用最为显著。ＫＣｌ，Ｋ２ＳＯ４，ＫＨ２ＰＯ４，ＮａＨ２ＰＯ４对固氮有明显抑制作用，以ＫＨ２ＰＯ４抑制作用最大。多盐组合对固氮作用表现为中间值或抑制作用叠加。不同无机盐对固氮作用和对异形胞分化的影响表现出不一致性，说明无机盐对二者的影响遵循不同的机制。NaCl,CaCl 2 and MgCl 2, in the low-osmotic concentration(0.05 mol/L), showed activating effect on the N 2-fixing activity of Anabaena cylindria. The NaCl, by enhancing N 2-fixing activity from 100% to 131% of the control, showed the most significantly positive effect, CaCl 2 was the next . KCl,K 2SO 4 and KH 2PO 4 caused the decline of N 2-fixing activity, and the inhibitory effect of KH 2PO 4 was the highest, followed by K 2SO 4. Different salt combinations showed different effects on N 2-fixation. Salt combinations had the intermediate values of the individual salts or showed additively inhibitory effects on N 2-fixation. The effect of different salts on N 2-fixation was independent of that on the heterocyst differentiation.

关 键 词：柱胞鱼腥藻 无机盐 固氮作用 盐胁迫 

分 类 号：Q949.220.6[生物学—植物学]