• Half-sib family: One parent in common mother for trees.. • Half-sib family: One parent in common mother for trees.. • Half-sib family: One parent in common mother for trees.. • Progeny
Trang 1Forest Tree Seed – definitions and concepts
Trang 31 Provenance
• Place where seed was collected
• Refers to natural forests, not plantations
• Provenance boundaries not always well defined
• Provenances may have different genetic adaptation
Trang 41 Provenance
• Example – E camaldulensis
Trang 52 Race
• Subdivision of a species, with genetically
similar individuals
• Sometimes synonymous with provenance
• Races separated using observed differences
• For example, wood basic density, bark
thickness, and flowering patterns have been
used to define E globulus races
Trang 63 Land Race
• Introduced trees that are adapted to an environment after several generations.
Trang 73 Land Race
• Introduced trees that are adapted to
an environment after several
generations.
• Advantage:
Selection may help land races adapt
to a new environment.
Trang 83 Land Race
• Introduced trees that are adapted to an
environment after several generations.
Trang 94 Family
• Individuals with parents in common.
Trang 104 Family
• Individuals with parents in common
• Half-sib family:
One parent in common (mother for trees)
Father is unknown, through natural pollination
Trang 114 Family
• Individuals with parents in common
• Half-sib family:
One parent in common (mother for trees)
Father is unknown, through natural pollination
• Full-sib family:
Trang 124 Family
• Individuals with parents in common
• Half-sib family:
One parent in common (mother for trees)
Father is unknown, through natural pollination
• Full-sib family:
Both parents in common
Generated by controlled (artificial) pollination
• Progeny:
Trees produced from seed of a known parent
Trang 134 Family
• SINGLE TREE COLLECTION
seed collected from 1 mother tree (i.e progeny will be a half-sib family)
Trang 144 Family
• SINGLE TREE COLLECTION
seed collected from 1 mother tree (i.e progeny will be a half-sib family)
• Half-sib family:
One parent in common (mother for trees)
Father is unknown, through natural pollination
• Progeny:
Trees produced from seed of a known parent
Trang 155 Seedlot
• Collection from a stand in one location
at ONE POINT IN TIME
• Reference number – links to seed
collection information, storage, dispatch etc.
• Can be a “bulk” or a group of single tree collections from the 1 stand, or both
Trang 165 Seedlot code
• For a bulk seedlot to be
REPRESENTATIVE of a provenance, should have 10-15 parents (or more)
equally represented
Trang 18Concepts to define – 2
7 Orthodox Seed
8 Unorthodox Seed
9 Recalcitrant Seed
Trang 197 Orthodox Seed
• Seeds can be dried down to low
moisture content (5%)
& successfully stored at low
temperatures for long periods
Trang 208 Unorthodox Seed
• Seed that is not orthordox
Îcan not be dried down to low moisture content (5%)
Îcan not be successfully stored at low temperatures for long periods
Trang 219 Recalcitrant Seed
• Unable to tolerate more than a limited amount of desiccation
e.g can not be stored with moisture
content in equilibrium at 20oC with
about 96-98% relative humidity
Trang 22Grevillea robusta over tea in Sri
Lanka
Trang 23Seed drying in sun
(what type of seed ?)
Trang 2410 Seed Stand
• High quality stand
• Natural stand OR Plantation
• Modified (thinning) to enhance seed
production
• If plantation – prefer to know its ORIGIN
Trang 2511 Seed Production Area
• Area established with objective of seed production
• Established with seed from KNOWN superior
source(s)
– more than 40 parents (>40 single tree collections bulked together)
• Managed for abundant production of high seed
– careful selection of superior trees
Trang 2611 Seed Production Area
• Could be developed from a provenance trial
- total removal of poor provenances
- very heavy thinning of other
provenances
Trang 27E dunnii Seed Production Area, Liuzhou 11-years old –
no flowers (no seed)
Trang 2812 Seed Orchard
• Pedigree known (and recorded for every tree)
• Statistically designed
• From superior provenances/seed sources
• High quality, intensive management
- regular assessment
- heavy rogueing/thinning
Trang 2912 Seed Orchard
CLONAL SEED ORCHARD
• Clones (grafts or rooted cuttings) from
parents intensively selected
• Randomised to minimise selfing
SEEDLING SEED ORCHARD
• >60 single tree seedlots, from superior