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Isolation of amyloplasts from developing maize endosperm.

E Echeverria¹, C Boyer, K C Liu

¹Department of Horticulture, The Pennsylvania State University, University Park, Pennsylvania 16802.

Plant Physiology

|March 1, 1985

Summary

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This study details a new method for isolating intact amyloplasts from maize endosperm protoplasts. This technique enhances the study of starch biosynthesis and storage in plants.

Area of Science:

Plant Biochemistry
Cell Biology
Molecular Biology

Background:

Amyloplasts are crucial organelles for starch synthesis and storage in plants.
Efficient isolation of intact amyloplasts is essential for studying their biochemical functions.

Purpose of the Study:

To develop a reliable method for isolating intact amyloplasts from developing maize endosperm.
To enable further research into the enzymes and processes involved in starch biosynthesis.

Main Methods:

Maize endosperm slices were incubated with cellulase and pectolyase to form protoplasts.
Protoplasts were purified using a Ficoll density gradient.
Protoplasts were ruptured, and amyloplasts were isolated via a discontinuous Ficoll density gradient.

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Main Results:

An amyloplast fraction, 50-93% intact and free of contamination, was successfully recovered.
The isolation method utilized specific buffer conditions and Ficoll gradients for optimal separation.
Amyloplast intactness was confirmed using fluorescent microscopy and marker enzyme activity.

Conclusions:

A robust protocol for isolating intact amyloplasts from maize endosperm has been established.
This method provides a valuable tool for investigating amyloplast function and starch metabolism.
The findings contribute to a deeper understanding of plant carbohydrate storage mechanisms.