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Journal ArticleDOI

Plant Growth Substances

01 Jun 1941-Annual Review of Biochemistry (Annual Reviews 4139 El Camino Way, P.O. Box 10139, Palo Alto, CA 94303-0139, USA)-Vol. 10, Iss: 1, pp 491-508
About: This article is published in Annual Review of Biochemistry.The article was published on 1941-06-01. It has received 6 citations till now.
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Journal ArticleDOI
TL;DR: Thiamine appears to be an important factor in the expression of biological control by P. fluorescens.
Abstract: In the biocontrol strain Pseudomonas fluorescens CHA0, the Gac/Rsm signal transduction pathway positively controls the synthesis of antifungal secondary metabolites and exoenzymes. In this way, the GacS/GacA two-component system determines the expression of three small regulatory RNAs (RsmX, RsmY, and RsmZ) in a process activated by the strain9s own signal molecules, which are not related to N-acyl-homoserine lactones. Transposon Tn5 was used to isolate P. fluorescens CHA0 insertion mutants that expressed an rsmZ-gfp fusion at reduced levels. Five of these mutants were gacS negative, and in them the gacS mutation could be complemented for exoproduct and signal synthesis by the gacS wild-type allele. Furthermore, two thiamine-auxotrophic (thiC) mutants that exhibited decreased signal synthesis in the presence of 5 × 10−8 M thiamine were found. Under these conditions, a thiC mutant grew normally but showed reduced expression of the three small RNAs, the exoprotease AprA, and the antibiotic 2,4-diacetylphloroglucinol. In a gnotobiotic system, a thiC mutant was impaired for biological control of Pythium ultimum on cress. Addition of excess exogenous thiamine restored all deficiencies of the mutant. Thus, thiamine appears to be an important factor in the expression of biological control by P. fluorescens.

21 citations


Cites background from "Plant Growth Substances"

  • ...Thiamine can also be a product of soil microorganisms ( 30 )....

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Journal ArticleDOI
TL;DR: Inorganic Sulfur Compounds 486 Inorganic sulfur compounds 488 organic sulfur compounds 489 copper compounds 490 copper compounds 490 Mercury Compounds 490 Boron, Selenium, Fluorine, Iron, Lithium, Manganese, Nickel, and Nickel 491 Phenolic compounds 491 Quinones 492 Heterocyclic Nitrogen Compounds 492 Oxines or 8-Quinolinols and Derivatives 492 Other Organic Compounds as mentioned in this paper.
Abstract: Introduction 486 Inorganic Sulfur Compounds 488 Organic Sulfur Compounds 489 Copper Compounds 490 Mercury Compounds 490 Boron, Selenium, Fluorine, Iron, Lithium, Manganese, Nickel 491 Phenolic Compounds 491 Quinones 492 Heterocyclic Nitrogen Compounds 492 Oxines or 8-Quinolinols and Derivatives 492 Other Organic Compounds 4........9....3 ....... 493 Antibiotics and Derivatives 493 Herbicides and Plant Growth Regulators .... 494 Chemical Composition and Metabolism ......... 494 Basic Research A Prerequisite to Chemical Control of Rusts 500 Literature Cited 50.... 2 ........ 502

18 citations