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Horticulture
stems and propogation
63
Agriculture
Undergraduate 1
10/22/2007

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Term
Seperation
Definition
propogation where you find a natural part of the plant to use.
Term
Suckers
Definition
Side shoots off plants you can use to propogate
Term
Asexual Propogation
Definition
Propogation that does not involve exchange of genetic material so it almost always produces plants that are identical to a single parent.

ex. cuttings, layering, division, grafting, budding, and tissue culture.
Term
Chilling Requirement
Definition
Requirements for fruit trees, nut trees, bulb plants, shrubs, and other plants, measured in the terms of the total hours needed during a dormant or winter period in which the temp. is below 45 and above 32. Meeting these requirements will result in normal growth and bloom in the succeeding growing season
Term
Delayed Foliation
Definition
The slow and prolonged growth of vegetative buds that may occur after insufficient winter chilling.
Term
Examples of Cold Damage
Definition
Death tissue
split bark
dessicate "Leaf Burn"
Heave (freezing and thawing push plants and roots above ground.)
Term
Climate (macroclimate)
Definition
Long term weather patterns of a fairly broad geographical area
Term
Local Climate
Definition
Average conditions of weather over a smaller area.

ex. a valley
Term
microclimate
Definition
relates to climatic variations existing within a larger area usually the result of a topographical feature, could be as small as the area around a particular plant, leaf, or stomata
Term
Optimum Temperature
Definition
The temperature at which plants function best
Term
Minimum Temperature
Definition
The temperature below in which plants can not grow
Term
Maximum Temperature
Definition
The temperature where plants cease to grow and physiological damage occurs.
Term
Birds nest fern
Definition
Name given to fern because of its form

Spores are on the underside of the fern, they reproduce. They are not dieing.

Brown things on the leaves of fern are insects and will kill the fern
Term
Climate Things
Definition

Temperature Range
Moisture/Percipitation
           rain

           snow
light
sky conditions
humidity

Term
Growing Season
Definition
First frost in fall is the end of the growing season

The last frost in spring is the beginning.
Term
Layering propogation
Definition
form of vegetative propogation in which an inact branch develops as the result of contact with the soil or rooting medium.

Works well with vines and flexible plants that touch soil.
Term
Grafting propogation
Definition
The art of joining plants parts together so they unite and continue growth as one.

-difficult other ways
-pest resistant
-change size
-repair damage
Term
Tissue Culture-Micropropogation
Definition
massive propogation from sample of tissue from the mother plant
Term
Leaf Cuttings Propogation
Definition
entire leaves with or without petioles which have neither buds nor roots, so they must develop both.
Term
Cuttings
Definition
detached vegetative plant parts which, when placed under conditions favorable for regeneration will develop into a complete plant with characteristics identical to the parent plant.
Term
Plant Propogation
Definition
Sexual Reproduction- Reproduction of plants through a sexual process involving meiosis (seeds)

Asexual Reproduction- The duplication of a whole plant from any cell, tissue, or organ of that plant.
Term
Leaf Modifications
Definition
-Succulent leaves- on plants that store a lot of water
-spines are sharp leaf modifications that often work by reflection light and condensing water
         -used for protection
         -Less surface area
-Tendrils are long thin grasping leaf modifications used for support
-Bracts are small modifications below flowers that attract polenators.
-Storage Leaves are fleshhy leaves that store water and carbs.
Term
Compound Leaves
Definition
have an axillary bud at the base of the leaf and each leaf breaks into many leaf-lets
Term
Parallel
Definition
veins run parallel to each other

ex. grasses, lillies, ginko leaves
Term
Palmate leaf
Definition
Central point from which radiate

ex. maple leaf
Term
Pinnate Leaves
Definition
feather like leaves

ex. oak
Term
Guard Cells
Definition
Small cells on either side of the stomata that regulate the opening and the closing of stomata
Term
Stomata
Definition
pores or openings in the leaf that allow gasses like CO2 and H20 vapor
Term
Blade
Definition
Flat, thin, expanded part of the leaf
Term

Bud Placement

Alternate-
Oppopsite

Definition
alternate-buds are placed alternatley along the stem

Opposite- buds are located opposite of each other on the stem
Term
Modifications of stem and leaf
Definition

stem-thorn
leaf-spine

Term
Corms
Definition
Short thickened compressed stems that grow underground
Term
Scaly bulbs
Definition
have fleshy overlapping leaves that resemble scales
Term
tubers
Definition
enlarged fleshy terminal portions of underground stems or rhizomes.
Term
Rhizomes
Definition
stems that grow horizontally at least partially if not completely underground. Act as storage organs.
Term
Leaf Bud cuttings
Definition
Cuttings consisting of a leaf blade, petiole, and a short piece of the stem, with the attached axillary bud placed with the bud end in the medium and covered enough to support the leaf so new roots must form.
Term
Tunicate Bulbs
Definition
Formed by concentric circles or rings and are covered by an outer layer called a tunica that serves as a dry protective covering
Term
Stem Cuttings
Definition
Cuttings that already have terminal or axillary buds. Must develop new roots at the base of the cutting before a new plant will be formed.

Downside of the stem cutting is that it is seperated from the mother plant.
Term
root cuttings
Definition
Root cuttings are cuttings 5-15cm long made from root sections in the fall or winter.  Must produce a new adventitous shoot and continue growth of the existing root section, or develop roots from the base of a new shoot.
Term
Stolons
Definition
stems that grow horizontally above ground and may produce root or shoots at the nodes

runner is a specialized stolon
Term
Bulbs
Definition
highly compressed underground stems
Term
Spur
Definition
Stems with short internodes, usually from older woods that usually bear leaves, fruit, or both.
Term
Branch
Definition
Lateral portion of the tree that originates from the trunk or from another branch that gives rise to shoots, twigs, and sometimes leaves
Term
Twig
Definition
A one year old stem that has no leaves
Term
shoot
Definition
a one year old stem that has leaves
Term
Trunk
Definition
the main axis of the stem
Term
Lenticles
Definition
small pores on the stem that permit gas exchange
Term
Leaf Scar
Definition
Portion of the stem where the leaf once attached to the stem.
Term
Root Cap
Definition
Covers the tip of the root
aids in the roots penetration of the soil
controls the response of the root to gravity
Term
Region of Elongation
Definition
located behind the region of cell division
cell walls stretch and become more permeable to water
Term
Region of maturation
Definition

place where cells become differentiated into various functional parts of the root

root hairs are produced here

Term
root hairs
Definition
Responsible for most of the water taken up by the plant

greatly increase the surface area of the roots

live 2-3 days
Term
Stem
Definition
Vegetative part of the axis of the plant which develops from the epicotyl of the embryo or from a bud of an existing stem or room. Supports the leaves and conduct water and nutrients between roots and leaves
Term
Node
Definition
Enlarged region or joint of the stem where the leaves are attached and the buds are located
Term
Internode
Definition
Region of the stem between two successive nodes
Term
Buds
Definition
Embroyonic stems surrounded by embroyonic leaf and/or flower tissue that will develop from the buds.
Term
Terminal (apical buds)
Definition
located at the tips of stems and are responsible for terminal growth
Term
Axillary or lateral buds
Definition
buds that are borne laterally on the stem in the axils of the leaves
Term
Adventitious Buds
Definition
Buds that originate at places on the plant other than nodes
Term
Bud Scales
Definition
Protective outer layer of small, leathery, modified leaves which typically develop on buds of woody temperate zone shrubs and trees
Term
Bud scale scar
Definition
scar that remains where bud scales were attached to them
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