Electrical conductivity as an indicator of pea seed aging of stored at different temperatures

Maristela Panobianco,Dilermando Perecin,Roberval Daiton Vieira

doi:10.1590/s0103-90162007000200003

Maristela Panobianco, Dilermando Perecin + Show 1 more

Open Access

https://doi.org/10.1590/s0103-90162007000200003

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Abstract

Research on soybean seed has revealed that conductivity test results may be influenced by storage temperature and that an apparent direct relationship between deterioration at low temperatures and loss of cellular membrane integrity is not evident. The objective of this study was to verify the influence of low storage temperatures on electrical conductivity results in other species, such as seeds of two pea cultivars studied temperatures were: 10, 20, 25, 20/10 and 25/10ºC. The physiological potential of the seeds was evaluated every three months during an 18 month storage period using germination, accelerated aging and electrical conductivity tests. The electrical conductivity test was not a good indicator for the degree of seed deterioration stored at low temperatures. Seed deterioration at 10ºC did not seem to be directly related to the loss of membrane integrity, possibly due to membrane repair or reorganization during storage at this temperature.

Highlights

Organization of cellular membranes is at its peak by the time a seed reaches physiological maturity (Abdul-Baki, 1980)
The higher the storage temperature, the lower was the physiological quality of the seeds
Transfer to a lower temperature after six months storage at 20/10oC and 25/10oC decreased germination further. This behavior was observed in seeds with superior or inferior physiological potential of both cultivars

Summary

Introduction

Organization of cellular membranes is at its peak by the time a seed reaches physiological maturity (Abdul-Baki, 1980). During the initial phase of the soaking process, the capacity of a seed to reorganize the cellular membrane system and repair physical and/or biological damage that may have occurred, will influence the quantity and nature of the lixiviates released into the environment (Simon & Raja Harun, 1972; Bewley & Black, 1994; Vieira & Krzyzanowski, 1999). Seeds with less physiological potential as a result of the deteriorative process have a reduced capacity for membrane reorganization and a greater loss of solutes to the environment, resulting in decreased seed reserves and reduced germination uniformity and speed. Agric. (Piracicaba, Braz.), v.64, n.2, p.119-124, March/April 2007

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