Ktl-icon-tai-lieu

4 Plant Popagation

Được đăng lên bởi csm1dhspnguyenquochai
Số trang: 22 trang   |   Lượt xem: 1086 lần   |   Lượt tải: 0 lần
4

❂

Plant Propagation

P

lant propagation is the process of multiplying the
numbers of a species, perpetuating a species or maintaining youthfulness of a plant. There are two types
of propagation: sexual and asexual.
Sexual propagation occurs when compatible pollen lands
on the flower’s stigma, grows down the style and fertilizes the egg in the flower’s ovary. The seed grows from the
flower’s union of the pollen and the egg and is often contained in a fruit or similar structure.
There are advantages to sexual propagation:
•	 It may be cheaper and quicker than other methods.
•	 It may be the only way to obtain new varieties.
•	 In certain species, it is the only viable method of propagation.
•	 It avoids transmission of certain diseases.
Asexual propagation involves regenerating a new plant
from a vegetative part (root, stem or leaf) of one parent.
The new plant is genetically identical to the parent plant.
Asexual propagation also has advantages:
•	 In some species, it may be easier and faster than sexual
propagation.
•	 It may be the only way to perpetuate some cultivars.
•	 It bypasses the juvenile characteristics of certain species.
Successful plant propagation requires practice and patience. It is a means to start new plants, increase existing
plant populations and garden with native plants.

Sexual propagation
Sexual propagation involves the union of pollen from a
male flower part with the egg of a female ovary to produce
a seed. The seed is made up of three parts: the outer seed

❂ Topics in this chapter
Sexual propagation
❂❂ Seeds
❂❂ Spores (ferns)
Asexual propagation
❂❂ Cuttings
❂❂ Layering
❂❂ Offsets
❂❂ Separation
❂❂ Division
❂❂ Grafting
❂❂ Budding
❂❂ Plant tissue culture

See Chapter 1,
Botany Basics.

Adapted from The Virginia Master Gardener
Handbook. Edited by Ray McNeilan, Extension
Agent Emeritus, Multnomah County, Oregon State
University.
Adapted by Robert Gorman, Extension Faculty,
Natural Resources and Community Development,
Cooperative Extension Service, University of
Alaska Fairbanks.

70 • Plant Propagation—Chapter 4

coat, which protects the seed; the endosperm, which is a food reserve; and the
embryo, which is the young plant itself.
When a seed is mature and put in a favorable environment, it germinates (begins
active growth).

Seeds

See Chapter 8,
Vegetable
Gardening.

Seeds can be collected late in the growing
season after plants have flowered and their
seeds have matured. Some plants grown in
Alaska are best propagated by ga...
Plant Propagation
4
Topics in this chapter
Adapted from The Virginia Master Gardener
Handbook. Edited by Ray McNeilan, Extension
Agent Emeritus, Multnomah County, Oregon State
University.
Adapted by Robert Gorman, Extension Faculty,
Natural Resources and Community Development,
Cooperative Extension Service, University of
Alaska Fairbanks.
Sexual propagation
Seeds
Spores (ferns)
Asexual propagation
Cuttings
Layering
Offsets
Separation
Division
Grafting
Budding
Plant tissue culture
P
lant propagation is the process of multiplying the
numbers of a species, perpetuating a species or main-
taining youthfulness of a plant. There are two types
of propagation: sexual and asexual.
Sexual propagation occurs when compatible pollen lands
on the owers stigma, grows down the style and fertil-
izes the egg in the owers ovary. The seed grows from the
owers union of the pollen and the egg and is often con-
tained in a fruit or similar structure.
There are advantages to sexual propagation:
It may be cheaper and quicker than other methods.
It may be the only way to obtain new varieties.
In certain species, it is the only viable method of propa-
gation.
It avoids transmission of certain diseases.
Asexual propagation involves regenerating a new plant
from a vegetative part (root, stem or leaf) of one parent.
The new plant is genetically identical to the parent plant.
Asexual propagation also has advantages:
In some species, it may be easier and faster than sexual
propagation.
It may be the only way to perpetuate some cultivars.
It bypasses the juvenile characteristics of certain spe-
cies.
Successful plant propagation requires practice and pa-
tience. It is a means to start new plants, increase existing
plant populations and garden with native plants.
Sexual propagation
Sexual propagation involves the union of pollen from a
male ower part with the egg of a female ovary to produce
a seed. The seed is made up of three parts: the outer seed
See Chapter 1,
Botany Basics.
4 Plant Popagation - Trang 2
Để xem tài liệu đầy đủ. Xin vui lòng
4 Plant Popagation - Người đăng: csm1dhspnguyenquochai
5 Tài liệu rất hay! Được đăng lên bởi - 1 giờ trước Đúng là cái mình đang tìm. Rất hay và bổ ích. Cảm ơn bạn!
22 Vietnamese
4 Plant Popagation 9 10 258