Plant Organs: Stems

Function of stems
- –Support for leaves
- –Some carry on photosynthesis
- –May be specialized for storage
- –Transport of materials between leaves and roots
Stems structure
- •Usually upright and aerial
- •May be herbaceous or woody
Herbaceous Dicot Stems Order
- •Epidermis
- –Cuticle
- •Cortex
- –Collenchyma and parenchyma (?chlorenchyma)
- •Vascular Bundles
- –Arranged in circular array with phloem toward periphery and xylem inside
- –Patch of Phloem Fibers generally present on bundles
- •Pith
- –Parenchyma
Monocot Stems I Characteristics
- •Herbaceous
- •Epidermis with cuticle
- •Cortex containing collenchyma and parenchyma cells
- •Vascular bundles scattered throughout cortex
- •No clear distinction between cortex and pith
- •Generally no secondary growth
Woody Dicot Stems
- •Periderm
- –Cork + Cork cambium
- •Cortex (???) --- Collenchyma and parenchyma
- •Primary Phloem
- •Secondary Phloem
- •Vascular cambium
- •Secondary Xylem
- •Primary Xylem
- •Pith
- •Secondary growth gives rise to cylinders of vascular tissue.
Function of stems
- Holds up leaves and flowers
- • Provides pathway for transport
Types of stems
- herbaceous
- woody

Author

DesLee26

204444

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Plant Organs: Stems

Description

Plant Organs

Updated

2013-03-02T17:51:40Z

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