plant propagation. one of the most rewarding and satisfying activities in horticulture is plant...
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Plant Propagation
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• One of the most rewarding and satisfying activities in horticulture is plant propagation.
• Plant propagation is the heart of all work in the field.
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What is plant propagation?
• Making new plants from old plants
• There are two (2) types of propagation:
sexual
asexual (vegetative)
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Why propagate plants
• To multiply numbers
• To save wanted traits
• To improve a species of plants
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• Biotechnology helps improve food production, quality of flowers, and resistance to disease in plants.
• Gene manipulation may someday cure many of our most deadly diseases.
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Sexual Propagation
• Involves the union of pollen with an egg in the ovary.
• These male and female cells may be from the same plant (self-pollination) or from
• Separate parent plants (cross-pollination)
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• Seeds are a way of rapidly increasing the number of a certain plant.
• Many plants reproduced from seed will differ from the original plants.
• This is because genes from each of the parent plants are represented in the new plant. Thus, a variety is created.
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Principles of Genetics
• Gregor Mendel, an Austrian Monk, is recognized for discovering the basic principles of genetics.
• Genetics is the study of how characteristics are passed from parents to offspring.
• He used observations of pea plants to develop these principles:
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• In all organisms, there is a pair of genes in every cell that determines every trait in that individual organism.
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• Individuals receive one gene for each trait from each parent.
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• Genes are transmitted from parent to offspring as unchanging units.
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• In the making of reproductive cells, gene pairs separate; with only one gene for each trait is contained in each gamete.
(sex cells: pollen or eggs)
Each gene passed on by the parent plant is called an allele
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• A visible characteristic is called a phenotype
• The combination genes from parent plants is the genotype
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• When different genes are present for a single trait, in most cases only one trait will be expressed (seen) in the offspring.
• The seen trait is called a dominant trait
The masked or unseen trait is a recessive trait
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• A dominant allele is written as an upper case letter symbol (T)
• A recessive allele is written as a lowercase letter symbol (t)
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• In plants, the color red is a dominant trait, white flowers are a recessive trait.
• If a plant has two (2) dominant genes for a trait, it is called pure dominant. (TT)
• Dominant homozygous
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• A plant with two(2) recessive genes is pure recessive (tt)
• recessive homozygous
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• A plant with two (2) different genes for a trait (Tt)
• It is heterozygous.
• Even though the individual has the recessive gene, the recessive trait is not seen. Only the dominant feature shows up
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Expected & Observed Results
• Question:
How can knowing the types of genes that each parent has be helpful?
• Traits the offspring will have can be predicted
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• The color, size and shape of the petals can be pre-determined by understanding what traits will appear when two plants are cross-pollinated.
• Biotechnology allows us to build or re-build plants to produce better quality flowers, fruit or growth habit by combining the best traits of different plants.
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Hybrid Seed
• Hybrid seed are specially produced seed that germinate into plants which appear to be genetically identical.
• If seed are taken from these hybrid plants, the resulting plants will have a variety of combinations of traits. If only the original traits are desired, do not use seed from hybrid plants.
• Chose seed from named varieties only.
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Sowing Seed
• Seed propagation of is used for many herbaceous annuals, and perennials.
• The proper environmental and cultural conditions must be provided:
1) temperature
2) moisture
3) light
4) media
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1)Place media in container (water gently)
2)Slowly shake seed onto media
a. broadcast: randomly & evenly shake out over the media
b. row plant: place seed in even rows*
(*best method to avoid spread of fungus /diseases)
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3) cover seed with a thin layer of media
4) water gently
5) place in area with higher humidity, and increase soil temperature to specified level for the seed growing. (bottom heat range 65’ – 70’)
6) label container with Named variety. date sown
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Asexual Propagation
• Reproduction without sex.
• Occurs naturally with most plants,
• Has become very important in the Horticultural Industry.
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• Clones – plants genetically identical being produced asexually (uses part of a plant)
• Pluses to clones:
The new plant is genetically identical
The new plant is quicker to get to mature size.
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Disadvantages of Using Seed to Propagate New Plants
• Seedlings may take too long to mature• Seed from some plants may be slow to
germinate (Adds to Costs)• Varying genetics transfer to off spring with
each generation.
• Seed production is mainly used when growing bedding plants, (annuals,perennials, and vegetables)
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• Asexual Propagation Provides:
• 1. uniformity of large numbers of plants
• 2. to sustain wanted or desired traits (characteristics)
• 3. rejuvenate sick or scraggly plants
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Methods of Propagating Plants Asexually
• Stem Cuttings• Cane Cuttings• Leaf Cuttings• Leaf-bud Cuttings• Layering• Air Layering• Division and Separation• Tissue Culture• Grafting
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Grafting
• The method of grafting is connecting two plants or plant parts together so they unite and continue to grow as one plant.
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• Grafting is possible only when the two plants are related at least at the family level.
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• A graft consists of two parts:
• Scion: • A short piece of stem with 2 or more buds,
becomes the top of the new plant
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• Understock: (rootstock)
• The lower part of the graft. Becomes the root system of the new plant
•
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Reason(s) for grafting
• Propagate plants difficult to propagate by other means
• Used most often in orchards, shade trees, and roses
• Creates dwarf plants• Creates plants with more hardy
characteristics
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Types of Grafts
• Whip and tongue graft-
• Used of wood smaller than an inch• Allows vascular tissue to match up
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Types of Grafts
• Cleft graft- • Used when the understock is larger than
the scion.• Vascular tissue must match up so scions
are inserted at the edges of the understock
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Types of Grafting
• Slip Graft (Side Graft)-
• Quickest graft, although hard to keep together (lined up)
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Types of Grafts
• Saddle graft – scion is cut so it sits over the understock a very tight fit is achieved
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Budding/Bud Grafting
• Similar to Grafting except the scion is a single bud with a small section of bark.
• Practiced in early spring just before plants break dormancy.
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Types of Budding
• T- Budding -
• buds removed from a plant with desirable traits then attached to an understock to form new plant
• The rootstock is cut in a “T” shape, the bud is slipped into the cut and tied off with a band. It is then covered with beeswax
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Types of Budding
• Patch Budding- desired bud is cut out like a stamp patch. The same shape patch is cut out of the understock.
• The bud is placed into the patch on the understock then tied off and covered with beeswax
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• For both types of budding, the top of the rootstock is cut just above the new bud once it opens to become the new plant's top
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• Grafting is important to the horticulture industry because it has enabled growers to create new plants while using the best traits of others.
• The wine industry of Europe was saved by the inferior rootstock of the 'Concord' Grape.