Spectroscopic Properties and Related Functions of the Stigma Measured in Living Cells of Euglena Gracilis

Overview

Journal Arch Microbiol

Specialty Microbiology

Date 1976 Dec 1

PMID 828030

Citations 4

Authors

P A Benedetti

G Bianchini

A Checcucci

R Ferrara

S Grassi

Affiliations

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Abstract

The spectroscopic properties of stigma inside green and dark-grown cells and of isolated stigma globules have been studied by means of a microspectrophotometer build in the Laboratory. On the base of these results and of the analysis of the absorption spectra of a stigma suspension, cell suspension and the cell methanolic extracts, it can be inferred that pigments localized in the stigma are free carotenoids which are not closely packed and do not show an ordered arrangement. Furthermore, the efficiency of the stigma as shading device is duscussed.

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References

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BATRA P, Tollin G . PHOTOTAXIS IN EUGLENA. I. ISOLATION OF THE EYE-SPOT GRANULES AND IDENTIFICATION OF THE EYE-SPOT PIGMENTS. Biochim Biophys Acta. 1964; 79:371-8. DOI: 10.1016/0926-6585(64)90017-2. View

Checcucci A, COLOMBETTI G, Ferrara R, Lenci F . Action spectra for photoaccumulation of green and colorless Euglena: evidence for identification of receptor pigments. Photochem Photobiol. 1976; 23(1):51-4. DOI: 10.1111/j.1751-1097.1976.tb06770.x. View