Báo cáo nghiên cứu nông nghiệp " Isolation, inbreeding and relationships in forest trees "

Chia sẻ: Nguyen Nhi | Ngày: | Loại File: PDF | Số trang:29

Thêm vào BST

Báo xấu

39
lượt xem 4
download

Download Vui lòng tải xuống để xem tài liệu đầy đủ

Selection for development of seed orchards - We selectively thin unpedigreed seed production areas, and pedigreed seed orchards, to achieve genetic gain - Must thin to one tree per plot in seedling seed orchards, to avoid inbreeding within families

Chủ đề:

Bình luận(0) Đăng nhập để gửi bình luận!

Lưu

Nội dung Text: Báo cáo nghiên cứu nông nghiệp " Isolation, inbreeding and relationships in forest trees "

Isolation, inbreeding and relationships in forest trees Selection concepts Forestry and Forest Products
Isolation, inbreeding and relationships in forest trees Phenotype 1. Selection (seed orchards, seed prod areas) 2. Forestry and Forest Products
Why is selection important? We want the best!
Do we want big trees?
Tree Quality Is environment important? P=G+E
E Environment ↕ Natural environment + Silvicultural
Genetics & silviculture together
Genetic diversity
Tree Quality Is environment important? P=G+E Product = genetics + environment
Activity cycle for tree breeding Selection Base Propagation Population Population (seed orchards) Crossing Planting stock Breeding for plantations Population Forestry and Forest Products
Activity cycle for tree breeding Selection Base Propagation Population Population (seed orchards or clone hedges) Crossing Planting stock Breeding for plantations Population
6. Genetic gain Gain ƒ ( i h2 σp ) Where: σp → variability h2 → genetic control i → selection intensity
Selection for development of seed orchards We selectively thin unpedigreed seed production areas, and pedigreed seed orchards, to achieve genetic gain Must thin to one tree per plot in seedling seed orchards, to avoid inbreeding within families
Seedling seed orchard with 60 ½-sib families 2 Col 1 3 4 5 6 7 8 9 10 11 12 ..... Rep 1 1 1 41 24 42 35 57 47 45 36 10 5 Row 2 4 15 12 18 50 13 19 44 60 25 32 16 30 m 60 ½ -sib families 3 52 55 11 49 8 48 51 6 20 59 3 28 4 46 37 26 53 40 30 29 54 7 39 9 23 5 2 58 43 22 34 21 17 14 38 56 27 33 5 tree row plots Rep 2 1 40 30 52 12 27 59 4 13 49 60 31 39 5 reps x 5 rows x 3 m = 75 m 2 5 2 14 50 33 51 24 23 34 18 7 46 5 replicates 3 6 44 37 45 35 58 10 43 54 17 16 3 4 29 38 48 1 53 28 26 8 56 55 15 22 each family occurs 5 20 36 32 9 25 11 47 19 21 41 42 57 Rep 3 1 35 22 25 42 6 55 15 39 43 47 5 13 only once in 2 37 8 20 48 3 46 59 38 10 40 36 4 replicate 3 19 9 18 23 58 7 14 11 28 32 51 60 4 41 29 16 57 17 34 21 1 53 45 26 12 5 49 56 30 2 52 24 50 27 31 33 54 44 Rep 4 1 27 45 44 13 37 20 16 30 25 6 40 54 2 14 57 29 28 2 41 11 9 58 8 49 10 3 18 24 55 7 22 47 34 15 42 1 4 50 4 23 43 39 3 5 31 52 46 32 53 17 38 12 21 33 36 60 56 35 51 26 48 59 19 Rep 5 1 21 18 59 43 31 14 49 28 47 30 20 41 2 3 40 7 33 51 17 13 50 9 12 58 42 3 60 54 2 56 39 38 5 25 55 34 44 36 4 26 46 27 15 48 22 32 4 35 10 53 6 5 8 11 19 52 45 16 1 37 23 29 57 24 90 m Forestry and Forest Products
Within-plot thinning of seed orchards First assessment Replicate 1 Replicate 2 Plot 1 Family 2 Plot 1 Family 3 Related trees adjacent - mating results in inbreeding Plot 2 Family 3 Plot 2 Family 5 Plot 3 Family 6 Plot 3 Family 4 Plot 4 Family 5 Plot 4 Family 1 Plot 5 Family 4 Plot 5 Family 2 Plot 6 Family 1 Plot 6 Family 6 Forestry and Forest Products
Self-fertilised family - inbreeding depression of yield pollen seed Forestry and Forest Products
Inbreeding outcrossed depression of growth in control-crossed progenies of E. camaldulensis (Petford) at 30 months - trial near Gympie, Queensland selfed Forestry and Forest Products
Inbreeding problems Rwanda landrace Vietnam Petford Petford landrace
E. camaldulensis: natural seed source vs local land race Australian seedlot (collected from natural stand, one year younger) Vietnam land race Forestry and Forest Products
Open-pollinated eucalypt family - insects are the main pollinators pollen pollen pollen seed 70% outcrossed 20% selfs 10% inbred (relative mating) Forestry and Forest Products