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28334D

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Image #   28334D
Name:   Pear sclereids or stone cells (Pyrus sp.)
Copyright:   Copyright 2008 Dennis Kunkel Microscopy, Inc.
Description:   Caption: Pear fruit sclerenchyma cells (Pyrus sp.) - sclereids / stone cells. Shown here is a section through a pear fruit revealing a cluster of sclereids, also known as stone cells. Sclereids are cells composed of thick cell walls that surround only a very small central cell cavity. The thick cell walls consist of cellulose, hemicellulose and lignin (a few thin walled parenchyma cells are also present). The small holes within the cell wall layers are called plasmodesmata. Sclerenchyma is a type of supporting tissue in plants. There are two types of sclerenchyma cells: fibers and sclereids. Sclerenchyma cells are the principal supporting cells in plant tissues that have ceased elongation. Mature sclerenchyma is composed of dead cells with extremely thick cell walls (secondary walls) that make up to 90% of the whole cell volume. Sclerenchyma fibers are of great economical importance, since they constitute the source material for many fabrics (flax, hemp, jute, ramie). A pear is a pomaceous fruit produced by a tree of the genus Pyrus. The pear is classified within Maloideae, a subfamily of the family Rosaceae. A major distinction of this fruit is the occurrence of lignified cells known as ""sclereids"" or ""stone cells"".
Magnification*: x160
Type: SEM
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   07.01.08 28334D pear pears pear fruit fruit cells fruit cell lignified cell lignified cells cellulose walls pear shaped pear-shaped pear shape pear-shape bosc pear stone cell stone cells pear grit Rosaceae pomaceous fruit pomaceous fruits pome pome fruit pome fruits SEM fruit cellulose wall fruit cellulose walls cellulose wall parenchyma cell parenchyma cells edible fruit fruit fruits plant plants fruit fiber fruit fibers pear parenchyma cell wall cell walls plant cell wall plant cell walls food foods edible food edible foods plasmodesmata cell wall plasmodesmata carbohydrate carbohydrates vitamin B2 vitamin C B-complex vitamins lignin lignified cell walls sclereids sclereid pear stone cell pear stone cells pear sclereid pear sclereids parenchyma B complex vitamins calcium Maloideae Pyrus riboflavin hemicellulose plant tissue plant tissues sclerenchyma sclerenchyma cell sclerenchyma cells sclerenchyma tissue natural fabric natural fabrics thick cell wall thick cell walls plasmodesma fiber fibers secondary cell wall secondary cell walls cell wall material sclerenchyma fiber sclerenchyma fibers sclerenchyma sclereid sclerenchyma sclereids clerenchyma stone cell clerenchyma stone cells secondary wall secondary walls

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