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Calcium localization within live oat leaves using a semiconductor detector assembly.

A Ringoet¹, R V Rechenmann, M Melloni

¹Association Euratom - Ital, Wageningen.

|February 13, 2014

Summary

Calcium-45 (45Ca) foliar application in oat leaves moves through vascular bundles. This calcium then rapidly moves from conducting tissues to mesophyll and epidermis cells, as shown by beta spectrometry.

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Area of Science:

Plant Physiology
Plant Nutrition
Biophysics

Background:

Understanding calcium (Ca) transport in plants is crucial for crop yield and health.
Foliar application is a common method for delivering nutrients like Ca to plants.
Previous methods like histoautoradiography have limitations in Ca localization.

Purpose of the Study:

To investigate the movement pathways of foliar-applied calcium-45 (45Ca) in young oat leaves.
To establish a reliable method for in-vivo localization of Ca within plant tissues.
To compare the findings with traditional histoautoradiography techniques.

Main Methods:

In-vivo beta spectrometry using a semiconductor detector assembly was employed for 45Ca localization.
Analysis focused on the shift in maximum energy of observed spectra, correlating with tissue depth.

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Histoautoradiography was used as a comparative technique.

Main Results:

Foliar-applied 45Ca is transported within the vascular bundles of oat leaves.
The majority of transported 45Ca rapidly moves out of vascular tissues into mesophyll and epidermal cells.
Beta spectrometry provided a reliable and interpretable parameter for 45Ca localization based on spectral energy shifts.

Conclusions:

In-vivo beta spectrometry is an effective method for tracing Ca movement in plant leaves.
Calcium transport from vascular bundles to surrounding cells is a rapid process.
The findings provide detailed insights into the physiological fate of foliar-applied calcium in oats.