Observations on the Aleurone Layer. II. Fluorescence Microscopy of the Aleurone-Sub-Aleurone Junction With Emphasis on Possible β-1,3-Glucan Deposits in Barley

Author:

Fulcher RG,Setterfield G,Mccully ME,Wood PJ

Abstract

The structural organization of the cell walls at the aleurone-sub-aleurone junction has been examined by fluorescence microscopy in ungerminated seeds of two varieties of Hordeum vulgare L. (cultivars Himalaya and Vanier). The sub-aleurone cell walls that are immediately adjacent to the aleurone layer are considerably thicker than the remainder of endosperm walls and contain extensive deposits of aniline blue-positive material. The latter was not significantly affected by periodate oxidation and was removed from tissue sections only by β-1,3-glucanases or hot dimethyl sulphoxide. These deposits may represent the primary substrate for endo-β-1,3-glucanases secreted by the aleurone layer during germination.

Publisher

CSIRO Publishing

Subject

Plant Science,Agronomy and Crop Science

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