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Identification of Growth Inhibition Phenotypes Induced by Expression of Bacterial Type III Effectors in Yeast

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Published on: March 30, 2010

FORMATION OF AUXIN IN YEAST CULTURES.

T W Robinson¹, T J Stier

¹Biological Laboratories, University of Illinois, Urbana, Illinois, and the Biological Laboratories, Harvard University, Cambridge, Massachusetts.

The Journal of General Physiology

|October 30, 2009

Summary

This summary is machine-generated.

Bakers' yeast produces significantly more auxin in culture media than previously reported. Growth conditions, including sucrose and peptone levels, pH, and cell multiplication rates, influence auxin yield and yeast cell morphology.

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Area of Science:

Microbiology
Biochemistry

Background:

Auxin, a plant hormone, is crucial for cell growth and development.
Previous studies indicated limited auxin production by yeast cells.
Yeast (Saccharomyces cerevisiae) is a well-established model organism in biological research.

Purpose of the Study:

To quantify auxin production in bakers' yeast culture media.
To investigate factors influencing auxin yield and yeast cell morphology.
To understand the mechanism of auxin excretion by yeast cells.

Main Methods:

Culturing bakers' yeast in varying concentrations of sucrose and peptone.
Measuring auxin concentration in the culture media.
Observing yeast cell morphology under different growth conditions.
Analyzing the relationship between pH, cell multiplication, and auxin yield.

Main Results:

Yeast produced substantially higher auxin levels in culture media compared to intracellular extraction.
Auxin yield increased with sucrose concentration and decreased with peptone concentration.
A negative correlation was observed between auxin yield and the rate of cell multiplication.
Acidic conditions (below pH 5) showed a direct proportionality between auxin yield and hydrogen ion concentration.
Elongated and enlarged yeast cells were observed in high-auxin media.

Conclusions:

Yeast actively excretes auxin into its surrounding medium.
Growth conditions significantly modulate yeast auxin production and excretion.
The findings suggest that auxin excretion is linked to the dissociation of auxin from its protein carrier under specific conditions.