Lecture 8 PA - Lecture 8: Sclerenchyma 1.) Overview -Who...

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Lecture 8: Sclerenchyma 1.) Overview -Who -What Fibers o –Fibers of commerce o Fibers: Where o Fibers of wood Sclereids o Where o Sclereid Type 2.) Sclerenchyma: Who Sclerenchyma refers to a (simple) tissue and a cell type. Can also be a patch or a scattered individual cell (idioblastic). Used for support. Have secondary cell walls that are usually lignified (birefringent) and so are NOT totipotent. The walls have few, if any, bordered pits. These are the “fibers” used to make textiles. (except cotton) 3.) Helianthus longitudinal section. Pink fibers taking up half of the section. 4.) Leaf cross-section. Pink bubbles that look similar to xylem cells are fibers. 5.) Sclerenchyma: What Often (but not always) dead and empty at functionality. Two types: fibers (elongate, long and skinny) and sclereids (short or isodiametric, funky shape) with a gradation between the two. Sometimes sclereids are long, but still not as long as the fibers. Fibers may have cross walls or be “septate”. The septa are made of a middle lamella and two primary walls. May or may not be lignified. Fibers may be “gelatinous”: have an inner distinguishable secondary wall that lacks lignin and is high in cellulose content ( the G-layer). Thus it has the ability to absorb a lot of water. 6.) Fibers of Commerce
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Lecture 8 PA - Lecture 8: Sclerenchyma 1.) Overview -Who...

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