BDB 2014 Picea study day, an introduction. Paul Goetghebeur, BG Ghent University
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1 BDB 2014 Picea study day, an introduction Paul Goetghebeur, BG Ghent University
2 From ferns to Gymnosperms : from sporangia to seeds
3 Seed ferns (fossil) : Medullosaceae (Kalkman 1972)
4 Seed ferns (fossil) (Stewart 1983) 1 2
5 Development of the ovule in Conifers Meiosis! pd 4 macrospores 1 functional macrospore pollen tube gametophyte producing eggs (Kalkman 1972)
6 Phylogeny of the Seed Plants : 5 monophyletic groups Gymnosperms
7 Cycadales : pachycaul species with a crown of stiff leaves
8 Cycads Dioon with female cone
9 Cycads Ceratozamia with female cone
10 Cycads Cycas with male cone
11 Cycads female Cycas with ovules
12 Fossil cycads : Williamsonia Blake & Mortimer, by E.P.Jacobs
13 Ginkgoales : feeling very lonely
14 Ginkgo biloba
15 Ginkgo biloba pollination drop on micropyle (Jin et al. 2012)
16 Ginkgo biloba, without and with pollen grains (Jin et al. 2012)
17 Ginkgo biloba + pollen Ginkgo Cycas Pinus Abies
18 Life cycle of Ginkgo biloba Pollen tube = haustorium
19 Ginkgo biloba, habit : short shoots with seeds
20 Gnetales : three bizarre genera
21 Gnetum, flowers and seeds
22 Ephedra viridis (Mojave desert)
23 Ephedra distachya : dry seeds included by fleshy scales
24 Welwitschia mirabilis in the Namib desert
25 Welwitschia mirabilis
26 Conifers : producing complex cones
27 Complex cones of Conifers, a survey (Kalkman 1972) (Florin 1951)
28 Conifers = Pinales 6 families (AP Web 2013)
29 Araucariaceae (3) Araucaria araucana
30 Podocarpaceae (19) Podocarpus elatus
31 Sciadopityaceae (1) Sciadopitys verticillata
32 Cupressaceae (29) Chamaecyparis obtusa
33 Taxaceae (6) Taxus baccata
34 Pinaceae : new branches becoming woody in 1st year
35 Pinaceae : 11 genera, 232 species
36 Abietoideae vs Pinoideae Abietoideae Pinoideae Ovulate cones erect (exc. Tsuga) hanging Cone scales narrow base broad base deciduous or persistent persistent Resin vesicles on seed present absent
37 Pinaceae Abies 50 Cathaya 1 Cedrus 4 Keteleeria 3 Larix 11 Nothotsuga 1 Picea 37 Pinus 111 Pseudolarix 1 Pseudotsuga 4 Tsuga
38 Picea : leaf base very prominent & soon woody
39 Picea : leaf base very prominent & soon woody
40 Picea phylogeny (Lockwood et al. 2013)
41 Picea phylogeny (Lockwood et al. 2013) * * *?? * *
42 Area of all species of Picea (Lockwood et al. 2013)
43
44
45 The take home message
46 The take home message Seed plants are spore-forming plants with specialized macrosporangia
47 The take home message Seed plants are spore-forming plants with specialized macrosporangia Gymnosperms : 4 monophyletic groups
48 The take home message Seed plants are spore-forming plants with specialized macrosporangia Gymnosperms : 4 monophyletic groups Many gymnosperms are producing pollination drops
49 The take home message Seed plants are spore-forming plants with specialized macrosporangia Gymnosperms : 4 monophyletic groups Many gymnosperms are producing pollination drops Cycads & Ginkgo with haustorial pollen tube & motile spermatozoids
50 The take home message Seed plants are spore-forming plants with specialized macrosporangia Gymnosperms : 4 monophyletic groups Many gymnosperms are producing pollination drops Cycads & Ginkgo with haustorial pollen tube & motile spermatozoids Pinales and Gnetales pollen tube : transporting sperm cells to egg cell
51 The take home message Seed plants are spore-forming plants with specialized macrosporangia Gymnosperms : 4 monophyletic groups Many gymnosperms are producing pollination drops Cycads & Ginkgo with haustorial pollen tube & motile spermatozoids Pinales and Gnetales pollen tube : transporting sperm cells to egg cell Pinales = Conifers : complex ovulate cones, 6 families
52 The take home message Seed plants are spore-forming plants with specialized macrosporangia Gymnosperms : 4 monophyletic groups Many gymnosperms are producing pollination drops Cycads & Ginkgo with haustorial pollen tube & motile spermatozoids Pinales and Gnetales pollen tube : transporting sperm cells to egg cell Pinales = Conifers : complex ovulate cones, 6 families Pinaceae : new shoots becoming woody in their first year, 11 genera
53 The take home message Seed plants are spore-forming plants with specialized macrosporangia Gymnosperms : 4 monophyletic groups Many gymnosperms are producing pollination drops Cycads & Ginkgo with haustorial pollen tube & motile spermatozoids Pinales and Gnetales pollen tube : transporting sperm cells to egg cell Pinales = Conifers : complex ovulate cones, 6 families Pinaceae : new shoots becoming woody in their first year, 11 genera Picea : leaf base very prominent and soon woody
54 The take home message Seed plants are spore-forming plants with specialized macrosporangia Gymnosperms : 4 monophyletic groups Many gymnosperms are producing pollination drops Cycads & Ginkgo with haustorial pollen tube & motile spermatozoids Pinales and Gnetales pollen tube : transporting sperm cells to egg cell Pinales = Conifers : complex ovulate cones, 6 families Pinaceae : new shoots becoming woody in their first year, 11 genera Picea : leaf base very prominent and soon woody Picea : morphology rather uniform, not congruent with molecular phylogeny
55 A sincere «Thank you» to : BDB Jan De Langhe Jean-Philippe Rameau Anne Sofie von Otter Cristina Branco Matthias Goerne, listen to : Oh du mein holder Abendstern
56
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