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Distribution of Hydrolysis Products of Inositol Penta and Hexaphosphates in Some Humid Tropical Soils

R. Mandal
Department of Soil, Water and Environment, University of Dacca, Bangladesh

A. Islam
Department of Soil, Water and Environment, University of Dacca, Bangladesh

Abstract/ Executive Summary:

The proportions of inositol pentaphosphate (IP₅) and hexaphospbate (IP₆) varied significantly and were found to be related to the organic matter and organic P contents of the soils sampled. Esters of myo+D-chiro IP₆ together accounted for 48 to 81 per cent and scylloinositol represented about 19 to 52 per cent of the total hexaphosphate. Simple correlation revealed that alkaline conditions probably favoured the synthesis of scyllo IP₆ by phytase and multiple correlation suggested that organic matter, organic P and pH were collectively related to the amounts of different inositol polyphosphate fractions in soil samples. The ratio of IP₆ to IP₅ varied between 0.7 and 4.3 and that of myo+D-chiro to scyllo -IP₆ between 0.9 and 4.3.

Keywords: Soil, Humid tropic soils, Soil properties,

Location: Department of Soil, Water and Environment, University of Dacca, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Land management

Objectives:

To estimate the relative amounts of isomeric IP₅ and IP₆in some humid tropic soils of Bangladesh and determine their relationships with soil properties.

Methodology:

Ten samples of surface soil (0 to 15cm) representing ten series varying in physical and chemical properties were collected from different parts of Bangladesh. Analyses were made for organic carbon by Tinsley’s wet combustion method as described, pH by the Pye glass electrode method (soil: solution ratio l:2.5), organic P, and inositol penta- and hexaphosphates and the isomers of IP₆.

Source of Information: Trop. Agric. (Trinidad) Vol. 55, No. 2, April 1978.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The content of IP₅ in the soil samples ranged from 22.5 to 64.6 p.p.m. (mean 39.8 p.p.m.) and that of IP₆ from 20.0 to 275.4 p.p.m. (mean 114.5 p.p.m.). These ranges correspond to about 9.4 to 17.3 and 11.1 to 49.2 per cent of the total organic P. The amounts of IPs and IP₆ were significantly (P=0.001) I correlated with organic matter and organic P contents of the soils. The IP₆ fraction contained a mean amount of 66.1 per cent (range 48 to 8l per cent of the myo+D-chiro isomers and 33.9 per cent (range 19 to 52 per cent of the scyllo isomer. In most soils the last mentioned isomer was the least abundant. A positive significant relationship was obtained between scyllo IP₆ and pH at the ten per cent level and no significant correlation was observed between myo+D-chiro IP₆ and pH. This suggested that alkaline conditions probably favoured the synthesis of scyllo IP₆ by phytase- However, multiple correlation suggested that all the above factors contributed to differing amounts of inositol polyphosphate fractions in the soil samples. The ratio of IP₆ to IP₅ varied between 0.7 and 4.3 and that of myo+D-chiro to scyllo IP₆ ranged from 0.9 to 4.5. Except for the Jatrabari soil, the IP₆ contents of the soils exceeded those of IP₅.

Knowledge Management: Report/Proceedings