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Water binding in sub-aerial cyanobacteria

B S Tiwari¹, S N Tripathi

¹Centre of Adanced Study in Botany, Banaras Hindu University, Varanasi, India.

Indian Journal of Biochemistry & Biophysics

|August 12, 1998

Summary

Water is crucial for cell integrity. Studies on cyanobacteria reveal distinct water binding sites, with more strong binding sites found in hydrated cells compared to dry ones, highlighting water

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Area of Science:

* Cellular Biology
* Microbiology
* Biophysics

Background:

* Water's role in maintaining cellular structural and functional integrity is well-established.
* Desiccation-tolerant cyanobacteria possess unique mechanisms for surviving water loss.

Purpose of the Study:

* To investigate water binding characteristics in desiccation-tolerant cyanobacteria.
* To quantify the strength and number of water binding sites at varying hydration levels.

Main Methods:

* Water sorption isotherms
* Dielectric spectroscopy
* Infrared (IR) spectroscopy
* D'Arcy/Watt equation applied to Scytonema geitleri and Lyngbya arboricola

Main Results:

* Identification of three distinct water binding regions within the cyanobacteria.
* Quantification of water binding sites using biophysical techniques.
* Significantly higher number of strong water binding sites observed in hydrated cyanobacterial mats compared to dry counterparts.

Conclusions:

* Cyanobacteria exhibit complex water binding properties essential for desiccation tolerance.
* Hydration state directly influences the number of strong water binding sites.
* Understanding these mechanisms can inform strategies for preserving biological materials.

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