FACTORS AFFECTING AMINO-ACID-UPTAKE BY THE ECTOMYCORRHIZAL FUNGUS PAXILLUS-INVOLUTUS

被引:34
作者
CHALOT, M [1 ]
KYTOVIITA, MM [1 ]
BRUN, A [1 ]
FINLAY, RD [1 ]
SODERSTROM, B [1 ]
机构
[1] LUND UNIV,DEPT MICROBIAL ECOL,S-22362 LUND,SWEDEN
来源
MYCOLOGICAL RESEARCH | 1995年 / 99卷
关键词
D O I
10.1016/S0953-7562(09)80784-3
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Factors affecting amino acid uptake by the ectomycorrhizal fungus Paxillus involutus were investigated using tracer kinetic experiments. Amino acid uptake by P. involutus was dependent on the pH of the incubation medium. Uptake of L-glutamate and L-glutamine had a distinct pH optimum around pH 4.0 and declined sharply between pH 4.5 and 6.4. Uptake of alanine and aspartate was also highest at low pH values (3-4) but declined more slowly with increasing pH. Total uptake of labelled amino acids was unaffected by 0.05 or 0.5 mM ammonium while 5 mM ammonium decreased amino acid uptake. Nitrate or glucose did not significantly affect amino acid uptake but glucose greatly increased the proportion of carbon that was respired. Uptake of the different amino acids decreased by a factor of 4 to 10 with increasing age (1-5 wk) and the proportion of absorbed C-14 that was respired increased with age. Changes in the size of the total amino acid pool were inversely related to those in the rate of uptake and the pool increased steadily with age. The implications of the ability of P. involutus to take up amino acids are discussed.
引用
收藏
页码:1131 / 1138
页数:8
相关论文
共 39 条
[11]   A STUDY OF AGING OF SPRUCE [PICEA-SITCHENSIS (BONG) CARR] ECTOMYCORRHIZAS .3. PHOSPHATE ABSORPTION AND TRANSFER IN AGING PICEA-SITCHENSIS TYLOSPORA-FIBRILLOSA (BURT) DONK ECTOMYCORRHIZAS [J].
CAIRNEY, JWG ;
ALEXANDER, IJ .
NEW PHYTOLOGIST, 1992, 122 (01) :159-164
[12]   A STUDY OF AGING OF SPRUCE [PICEA-SITCHENSIS (BONG) CARR] ECTOMYCORRHIZAS .2. CARBOHYDRATE ALLOCATION IN AGING PICEA-SITCHENSIS TYLOSPORA-FIBRILLOSA (BURT) DONK ECTOMYCORRHIZAS [J].
CAIRNEY, JWG ;
ALEXANDER, IJ .
NEW PHYTOLOGIST, 1992, 122 (01) :153-158
[13]   METABOLISM OF [C-14] GLUTAMATE AND [C-14] GLUTAMINE BY THE ECTOMYCORRHIZAL FUNGUS PAXILLUS-INVOLUTUS [J].
CHALOT, M ;
BRUN, A ;
FINLAY, RD ;
SODERSTROM, B .
MICROBIOLOGY-UK, 1994, 140 :1641-1649
[14]   RESPIRATION OF [C-14] ALANINE BY THE ECTOMYCORRHIZAL FUNGUS PAXILLUS-INVOLUTUS [J].
CHALOT, M ;
BRUN, A ;
FINLAY, RD ;
SODERSTROM, B .
FEMS MICROBIOLOGY LETTERS, 1994, 121 (01) :87-91
[15]   AMMONIUM ASSIMILATION BY SPRUCE HEBELOMA SP ECTOMYCORRHIZAS [J].
CHALOT, M ;
STEWART, GR ;
BRUN, A ;
MARTIN, F ;
BOTTON, B .
NEW PHYTOLOGIST, 1991, 119 (04) :541-550
[16]  
COLE DW, 1981, TERRESTRIAL NITROGEN, P219
[17]  
EK H, 1995, NEW PHYTOL, V128, P629
[18]  
ELBADAOUI K, 1989, ANN SCI FOREST, V46, P728
[19]   UPTAKE, TRANSLOCATION AND ASSIMILATION OF NITROGEN FROM 15N-LABELED AMMONIUM AND NITRATE SOURCES BY INTACT ECTOMYCORRHIZAL SYSTEMS OF FAGUS-SYLVATICA INFECTED WITH PAXILLUS-INVOLUTUS [J].
FINLAY, RD ;
EK, H ;
ODHAM, G ;
SODERSTROM, B .
NEW PHYTOLOGIST, 1989, 113 (01) :47-55
[20]   UTILIZATION OF ORGANIC AND INORGANIC NITROGEN-SOURCES BY ECTOMYCORRHIZAL FUNGI IN PURE CULTURE AND IN SYMBIOSIS WITH PINUS-CONTORTA DOUGL EX LOUD [J].
FINLAY, RD ;
FROSTEGARD, A ;
SONNERFELDT, AM .
NEW PHYTOLOGIST, 1992, 120 (01) :105-115