A CADMIUM-TOLERANT STRAIN OF NEOCOSMOSPORA-VASINFECTA SHOWS REDUCED CADMIUM INFLUX

被引:3
作者
BUDD, K
机构
来源
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE | 1991年 / 69卷 / 06期
关键词
CADMIUM; CALCIUM; NEOCOSMOSPORA; TOLERANCE; TOXICITY; TRANSPORT;
D O I
10.1139/b91-168
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Neocosmospora vasinfecta was grown in a defined liquid medium and its growth responses to CdSO4 were measured. The specific growth rate of mycelium not previously exposed to cadmium was reduced to 50% by 51-mu-M cadmium. The growth response to concentrations of cadmium above 50-mu-M was complex, showing declining and then recovery phases. Inoculum taken from a culture grown to the recovery phase in presence of 100-mu-M cadmium was cadmium tolerant; a cadmium level of 420-mu-M was required to reduce its specific growth rate by 50%. Tolerance was not lost by growth in the absence of cadmium. The tolerant mycelium showed markedly reduced net uptake of cadmium as compared with the normal (cadmium sensitive) mycelium. This reduction was due to a decrease in the unidirectional influx of cadmium, with little or no change in efflux. Cadmium toxicity in the normal mycelium was strongly antagonized by calcium but only weakly by manganese or zinc. Calcium also inhibited the uptake of cadmium.
引用
收藏
页码:1296 / 1301
页数:6
相关论文
共 32 条
[11]   SYNTHESIS OF 7 DIFFERENT HOMOLOGOUS PHYTOCHELATINS IN METAL-EXPOSED SCHIZOSACCHAROMYCES-POMBE CELLS [J].
GRILL, E ;
WINNACKER, EL ;
ZENK, MH .
FEBS LETTERS, 1986, 197 (1-2) :115-120
[12]  
JOHO M, 1983, PLANT CELL PHYSIOL, V24, P389
[13]  
JOHO M, 1985, J GEN MICROBIOL, V131, P53
[14]   OSMOTIC ADJUSTMENT IN THE MYCELIAL ASCOMYCETE NEOCOSMOSPORA-VASINFECTA (SMITH EF) [J].
KELLY, DJA ;
BUDD, K .
EXPERIMENTAL MYCOLOGY, 1990, 14 (02) :136-144
[15]  
KESSELS BGF, 1985, J GEN MICROBIOL, V131, P2533
[16]   CADMIUM UPTAKE IN ESCHERICHIA-COLI K-12 [J].
LADDAGA, RA ;
SILVER, S .
JOURNAL OF BACTERIOLOGY, 1985, 162 (03) :1100-1105
[17]   CADMIUM-RESISTANT MUTANT OF BACILLUS-SUBTILIS 168 WITH REDUCED CADMIUM TRANSPORT [J].
LADDAGA, RA ;
BESSEN, R ;
SILVER, S .
JOURNAL OF BACTERIOLOGY, 1985, 162 (03) :1106-1110
[18]   ACCOMMODATION OF YEAST TO TOXIC LEVELS OF CADMIUM IONS [J].
MACARA, IG .
JOURNAL OF GENERAL MICROBIOLOGY, 1978, 104 (FEB) :321-324
[19]   GENE CONTROL OF RESISTANCE VS SENSITIVITY TO CADMIUM IN SACCHAROMYCES [J].
MIDDLEKAUFF, JE ;
HINO, S ;
YANG, SP ;
LINDEGREN, G ;
LINDEGREN, CC .
JOURNAL OF BACTERIOLOGY, 1956, 72 (06) :796-801
[20]  
MINNEY SF, 1985, MICROBIOS, V42, P37