Saturday, August 29, 2009

Shoots of Blueberry

Shoots of Blueberry
The shoot supports the buds and leaves of the plant and provides for conduction between the leaves and the roots.

Older shoots are called canes.

The blueberry shoot consists of a dense layer of ordered symmetrical epidermal cells surrounding up to a dozen layers of chlorophylous cortical parenchyma tissue containing air canals.

These are surrounded by iso-diametric parenchyma cells attached to each other by thread-like constructions.

Beneath the cortex is the dense pericycle, next to which lies the phloem.

Thick walled parenchyma rays, either broad or uniserate, radiate across the xylem, which also contains thick fibers and long vessels.

The compound, broad rays are made up of both light and dark colored cells.

Spring and autumn wood care not well differentiated.

Simple, thin walled parenchyma compose the pitch.

The young shoot is surrounded by a cuticle that is replaces by periderm (bark) as the stem matures.

The epidermis contains numerous stomates that cork over into lenticels and cease to function as the stem ages. Young stems often have longitudinal ridges, whereas more mature stems are nearly circular in cross-section.
Shoots of Blueberry

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