LO 4.0 - Describe propagation by seed Flashcards
Question
What are the principals of Seed Sexual Propagation?
6 general points to consider.
Seeds
Seeds - Sexual Propagation
* Sexual reproduction within species.
* Genetic recombination occurs.
* Different characteristics from parents.
* Plants may not produce seed until mature.
* Some plants do not produce seed.
* Some plants produce infertile seed.
Seeds
Question
What are the genetic outcomes of Sexual Propagation?
6 general points to consider.
Seeds
Genetic Outcomes of Sexual Propagation
* It impacts by allowing future generations of plants to mix in an almost infinite range of phenotypes.
Seeds
Question
What are the two Seed Classes?
Name them.
Seeds
The two Seed Classes are…
* Gymnosperms (naked seed)
* Angiosperms (enclosed seed)
Seeds
Question
What are Gymnosperm seeds?
4 bullet points.
Seeds
Gymnosperms (naked seed)
* The more primitive of the two
* No special structures develop to cover seed
* In time cone scales or arils grow to cover the seed
* Mostly conifers but not always
Seeds
Info Graphic
Gymnosperm seeds.
Seeds
Gymnosperm seeds.
Seeds
Info Graphic
Gymnosperm seeds.
Seeds
Gymnosperm seeds.
Seeds
Question
What are Angiosperm seeds?
4 bullet points.
Seeds
Angiosperm seeds
* Enclosed by hard or fleshy coat called fruit
* The more recently evolved seed type
* Huge range of morphotypes (shapes)
* Very successful, out compete Gymnosperms
Seeds
Info Graphic
Angiosperm seeds.
Seeds
Angiosperm seeds.
Seeds
Info Graphic
Angiosperm seeds.
Seeds
Angiosperm seeds.
Seeds
Info Graphic
Angiosperm seeds.
Seeds
Angiosperm seeds.
Seeds
Info Graphic
Gymnosperm Propagation
Seeds
Gymnosperm Propagation
Seeds
Info Graphic
Angiosperm Propagation
Seeds
Angiosperm Propagation
Seeds
Study Card
Seed Production
Seeds
Seed Production
* Genetic diversity - Evolves beneficial recombinations
* Seed is an embryonic plant - Embryo - Seed coat - Food reserve
* Product of ovule of both Gymnosperms and Angiosperms
* Generally occurs post fertilisation
* Some plants are Apomictic (non fertilised) - Erigeron compositus
* Embryo develops from zygote
Seeds
Question
What are Apomicitc Plants?
Seeds
Apomicitc Plants
* Are able to produce seeds by a process of myosis.
* Like clone of the parent plants
* In nature it is only used sparingly
Seeds
Info Graphic
Seed Production Cycle
Seeds
Seed Production Cycle
Seeds
Info Graphic
Advantages of Seed Propagation
Seeds
Advantages of Seed Propagation
Seeds
Question
When should you collect Seeds?
5 points
Seeds
Seed Collection
* Collect when ready - Colour change
* Place seed on sheets of blotting paper if excessively wet
* Place seed in paper bags or breathable material if collected in dry conditions
* Allow to dry for a suitable period of time
* Ensure storage in suitable conditions - Dry - Cool - Vermin free
Seeds
Question
What is Seed Provenance?
5 points
Seeds
Seed Provenance
* The geographical area and environment to which the parent trees, etc. are native, and within which their genetic constitution has been developed through natural selection .
Seeds
Question
What are some disadvantages of Seed Propagation?
8 bullet points
Seeds
Seed Propagation
* Seed are not usually true to type.
* Seedling plants are not uniform in: Growth - Flowering ability - Fruit quality or Capacity to yield.
* Plants take longer to flower and fruit.
* Trees are difficult to manage in orchards when rootstocks are grown from seed
Seeds
Question
There are many advantages of Seed Propagation.
How many do you know?
8 bullet points
Seeds
Seed Propagation
* Sometimes only possible or practical method of commercially growing plants.
* Seed is important in developing new cultivars.
* May raise chance seedlings with superior characteristics.
* Seed raised trees generally live longer.
* Seed raised can be hardier.
* Seed can produce virus free plants.
* Seed are a convenient method of storing plants.
* Many rootstocks are raised from seed
Seeds
