Characterization of the indole-3 acetic acid (IAA) biosynthetic pathway in an epiphytic strain of Erwinia herbicola and IAA production in vitro

被引:32
作者
Brandl, M
Clark, EM
Lindow, SE
机构
[1] Dept. Environ. Sci., Plcy. and Mgmt., Division of Environmental Biology, University of California, Berkeley
关键词
indole-3-acetic acid; Erwinia; tryptophan; indole-3-pyruvic acid; nitrogen;
D O I
10.1139/m96-079
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
An epiphytic strain of Erwinia herbicola (strain 299R) synthesized indole-3-acetic acid (IAA) from indole-3-pyruvic acid and indole-3-acetaldehyde, but not from indole-3-acetamide and other intermediates of various IAA biosynthetic pathways in enzyme assays. TLC, HPLC, and CC-MS analyses revealed the presence of indole-3-pyruvic acid, indole-3-ethanol, and IAA in culture supernatants of strain 299R. Indole-3-acetaldehyde was detected in enzyme assays. Furthermore, strain 299R genomic DNA shared no homology with the iaaM and iaaH genes from Pseudomonas syringae pv. savastanoi, even in Southern hybridizations performed under low-stringency conditions. These observations strongly suggest that unlike gall-forming bacteria which can synthesize IAA by indole-3-acetamide, the indole-3-pyruvic acid pathway is the primary route for IAA biosynthesis in this plant-associated strain. IAA synthesis in tryptophan-supplemented cultures of strain 299R was over 10-fold higher under nitrogen-limiting conditions, indicating a possible role for IAA production by bacterial epiphytes in the acquisition of nutrients during growth in their natural habitat.
引用
收藏
页码:586 / 592
页数:7
相关论文
共 36 条
[11]   IAA BIOSYNTHETIC-PATHWAY FROM TRYPTOPHAN VIA INDOLE-3-PYRUVIC ACID IN ENTEROBACTER-CLOACAE [J].
KOGA, J ;
ADACHI, T ;
HIDAKA, H .
AGRICULTURAL AND BIOLOGICAL CHEMISTRY, 1991, 55 (03) :701-706
[12]  
KOLTER R, 1993, ANNU REV MICROBIOL, V47, P855, DOI 10.1146/annurev.mi.47.100193.004231
[13]  
KOSUGE T, 1986, IOWA STATE J RES, V60, P529
[14]  
KOSUGE T, 1966, J BIOL CHEM, V241, P3738
[15]   ROLE OF AMINOTRANSFERASE AND INDOLE-3-PYRUVIC ACID IN SYNTHESIS OF INDOLE-3-ACETIC ACID IN PSEUDOMONAS-SAVASTANOI [J].
KUO, TT ;
KOSUGE, T .
JOURNAL OF GENERAL AND APPLIED MICROBIOLOGY, 1970, 16 (03) :191-+
[16]   ON BIOGENESIS OF SOME INDOLE COMPOUNDS IN ACETOBACTER XYLINUM [J].
LARSEN, P ;
HARBO, A ;
AASHEIM, T ;
KLUNGSOYR, S .
PHYSIOLOGIA PLANTARUM, 1962, 15 (03) :552-&
[17]  
LEE M, 1970, Canadian Journal of Microbiology, V16, P1325
[18]  
LINDOW SE, 1987, PHYTOPATHOLOGY, V77, P1724
[19]   INDOLEACETIC-ACID PRODUCTION - PLASMID FUNCTION OF AGROBACTERIUM-TUMEFACIENS C58 [J].
LIU, ST ;
KADO, CI .
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 1979, 90 (01) :171-178
[20]  
Magasanik B., 1987, ESCHERICHIA COLI SAL, P1318