Molecular Systematics & Ethnobotany Case Study: Breadfruit
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1 Molecular Systematics & Ethnobotany Case Study: Breadfruit Thanks to Tim Motley & Nyree Zerega for pictures and information. Hawaii, California, Bering Straight Bounty-hunting Pandora s Box Breadfruit Molecular systematics 1
2 I. Circumstances Leading to the Mutiny on the Bounty William Bligh -James Cook s sailing master (3 rd Voyage; 1776) -Captain, HMS Bounty ( ) HMS Bounty George III (reign: ) portrait by Allan Ramsay, 1762 Mutiny on the Bounty,
3 the truth behind the legend. The voyage of the HMS Bounty, Dec 1787, departed for Tahiti Mission: To collect breadfruit for West Indies. Crew: Bligh (Captain) Fletcher Christian (Master s Mate) 2 Civilian botanists 42 other s 3
4 Cape of Good Hope Cape Aguhlas 4
5 Great White Breaching for Lunch in False Bay 2000 Chris Fallows The voyage of the HMS Bounty, Oct 1788, reached Tahiti 5 mos. collecting & preparing 1015 breadfruit trees. -4 Apr 1789; set sail for West Indies 5
6 -29 Apr 1789, mutiny. Led by Fletcher Christian Bligh setting out (ultimately) for Timor and the Malay Archipelago (3618 nautical miles; 6701 km). Painting by Robert Dodd. After the mutiny, Bligh went to Timor and the Malay Archipelago. (3618 nautical mile or 6701 km over 47 days with only a sextant, pocket watch, and no compass) 6
7 After the mutiny, Mutineers: attempts to settle Tubuai (3 mo.; cannibals), then 14 back to Tahiti, 8 to Pitcairn Islands along with 6 Tahitian men, 11 Tahitian women, and 1 baby. Why the mutiny? 7
8 After the mutiny HMS Pandora -14 mutineers in Tahiti caught, held in Pandora s Box Pandora (G.) = first woman, a gift from Zeuss & other gods She comes bearing another gift a mysterious jar. The rest is history (or myth). Pandora by John W. Waterhouse, 1896 Pandara engraving based on painting by FS Church After the mutiny HMS Pandora -14 mutineers in Tahiti caught, held in Pandora s Box -Return (1791): Great Barrier Reef, 4 prisoners and 31 crew lost, Timor refuge. -Britain (1792): 10 surviving mutineers tried. Pandora by John W. Waterhouse, 1896 Pandara engraving based on painting by FS Church 8
9 After the mutiny Pitcairn Islands -1789: 8 mutineers, 6 Tahitian men, 11 women and 1 baby : 4 mutineers & 10 women plus their children remaining. Cristian not among them. -by 1808: discovered by British, 1 surviving mutineer plus original women and descendants. -Today: ca. 50 inhabitants. 9
10 II. Breadfruit Origins A. Artocarpus & Artocarpus altilis India Australia II. Breadfruit Origins A. Artocarpus & Artocarpus altilis 60 spp of trees & shrubs SE Asia & Pacific Moraceae (mulberry & fig family) India Australia 1
11 II. Breadfruit Origins A. Artocarpus & Artocarpus altilis Produce large, multiple fruits Source of breadfruit & jackfruit Jackfruit, Artocarpus heterophyllus 2
12 Breadfruit, Artocarpus altilis Breadfruit, Artocarpus altilis Starch staple of Pacific islands, millennia. Humans selected for sterile (seedless) cultivars. Sterile throughout much of range. Classic example of species (crop plant) that evolved & spread with humans. <Seeded cultivar Seeded wild species > 3
13 Breadfruit, Artocarpus altilis Seeded & Sterile Sterile Seeded & Sterile Sterile Sterile Breadfruit, Artocarpus altilis Seeded & Sterile Sterile Seeded & Sterile Sterile Sterile -Where, how, and when did breadfruit originate? -What is the wild progenitor species? -Why & how have sterile varieties persisted? -What role have humans had in breadfruit origins and dispersal? 4
14 II. Breadfruit Origins B. 3 Prior Hypotheses Based on Biogeography & Morphology Breadfruit s closest relatives Breadfruit is morphologically similar to two other species A. mariannensis (dugdug) A. Altilis (breadfruit) A. camansi (breadnut) Fruit shape and texture is variable in A. altilis and intermediate between the other two. A. mariannensis (dugdug) A. altilis (breadfruit) A. camansi (breadnut) 5
15 Leaf variation suggests contributions from both A. mariannensis (dugdug) A. altilis (breadfruit) A. camansi (breadnut) Distribution of three species. A. mariannensis (dugdug) A. camansi (breadnut) 6
16 Breadfruit, Artocarpus altilis Seeded & Sterile Sterile Seeded & Sterile Sterile Sterile Dugdug Origin A. camansi (breadnut) A. mariannensis (dugdug) A. altilis (breadfruit) A. mariannensis (dugdug) A. camansi (breadnut) A. altilis (breadfruit) Breadnut Origin A. camansi (breadnut) A. altilis (breadfruit) A. mariannensis (dugdug) Hybrid Origin 7
17 II. Breadfruit Origins C. Hypothesis Testing (Zerega et al. 2005) 1. Methods Used Breadfruit s closest relatives a. Phylogeny reconstruction within Artocarpus 1) Phylogenetic (cladistic) inference can be done with either molecular or morphological characters. II. Breadfruit Origins C. Hypothesis Testing (Zerega et al. 2005) 1. Methods Used Breadfruit s closest relatives a. Phylogeny reconstruction within Artocarpus 2) Plants have 3 genomic sources of molecular data cpdna maternally inherited mtdna maternally inherited ndna biparentally inherited 8
18 II. Breadfruit Origins C. Hypothesis Testing (Zerega et al. 2005) 1. Methods Used Breadfruit s closest relatives a. Phylogeny reconstruction within Artocarpus 3) Zerega et al. used two genes: ITS and trnlf cpdna maternally inherited mtdna maternally inherited ndna biparentally inherited II. Breadfruit Origins C. Hypothesis Testing (Zerega et al. 2005) 1. Methods Used Breadfruit s closest relatives a. Phylogeny reconstruction within Artocarpus 4) PCR & DNA sequencing allows selective amplification and determining the nucleotide sequence of a small region of DNA 18S ITS 1 ITS 2 5.8S 26S nuclear ribosomal DNA locus 9
19 Portion of most parsimonious cladogram A. blancoi A. treculianus A. excelsus A. lowii A. kemando A. maingayi A. sericicarpus A. tamaran A. elasticus A. altilis. E. Polynesia A. altilis, Melanesia Conclusions: A. camansi & A. mariannsis are BF s closest relatives. BF may be derived from A. mariannensis. But Hybrid Hyp. can t be ruled out cladistically. A. scortechenii 1) Cladograms only resolve A. camansi (breadnut) phylogeny, and not tokogeny. A. camansi (breadnut) 2) Although ITS or trnlf may be A. mariannensis (dugdug) from A. mariannensis, other A. Mariannensis (dugdug) genes may be from A. camansi A. altilis, Micronesia A. altilis, W. Polynesia Problems with 1- to few-gene approach when dealing with hybrid hypothesis (for nuclear genes): A. mariannensis dugdug AABB X Arto. altilis AaBb A. camansi breadnut aabb Hybrids are expected to have genetic markers of both species ( additivity ) for nuclear genes. 10
20 Problems with 1- to few-gene approach when dealing with hybrid hypothesis (for nuclear genes): A. mariannensis dugdug AABB X A. camansi breadnut aabb Sex in hybrid species would thoroughly mix alleles. Arto. altilis AaBb Cladogram derived from gene A using this plant as an A. altilis representative would show breadnut as sister. Arto. altilis AaBb X Arto. altilis, AABB AABb AAbb AaBB AaBb Aabb aabb aabb aabb Arto. altilis AaBb Cladogram derived from gene A using this plant as an A. altilis representative would show dugdug as sister. Finer data needed (ca cultivars of A. altilis!) A. blancoi A. treculianus A. excelsus A. lowii A. kemando A. maingayi A. sericicarpus A. tamaran A. elasticus A. scortechenii A. camansi (breadnut) A. camansi (breadnut) A. mariannensis (dugdug) A. Mariannensis (dugdug) A. altilis, Micronesia A. altilis. E. Polynesia A. altilis, Melanesia A. altilis, W. Polynesia 11
21 II. Breadfruit Origins C. Hypothesis Testing (Zerega et al. 2005) 1. Methods Used Breadfruit s closest relatives b. AFLP Analysis in Artocarpus marianensis, A. altilis and A. camansi. 1) Key points to AFLP approach for testing hybrid hypothesis sampling of many individuals within species and cultivars. Rapid, genome wide rather than 1 or two genes. Look for additivity of A. marianensis and A. camansi markers in A. altilis. 2) Method Summary Extract DNA from many different trees for each species Cut up into tiny piecies using restriction enzymes that cut at precise sequence motifs PCR amplify all fragments Electrophoresis to visualize fragments Amplified Fragment Length Polymorphisms (AFLPs) (DNA fingerprinting) 12
22 If breadfruit is a hybrid A. camansi (breadnut) A. altilis (breadfruit) A. mariannensis (dugdug) Then we expect additivity of AFLP markers A. camansi (breadnut) A. altilis (breadfruit) A. mariannensis (dugdug) Much of breadfruit is breadnut, some islands (esp. Micronesia) with dugdug genes too. Diane Ragone (NTBG), N. Zerega Dugdug range Breadnut range Proportion of breadfruit population with dugdug markers (black = dugdug-specific markers) Proportion of breadfruit population with breadnut markers (grey = breadnut-specific markers) 13
23 Does archeological evidence help explain this pattern? Lapita reach Hawaii 1700 ybp Dugdug range Breadnut range Lapita: ybp Lapita reach Easter Island 1700 ybp Does archeological evidence help explain this pattern? Lapita reach Hawaii 1700 ybp Dugdug range Breadnut range Lapita: ybp Seeded, sexual cultivars initially. Today both seeded and unseeded exist. Unseeded, asexual cultivars derived. Today only unseeded exist here. Lapita reach Easter Island 1700 ybp 1. Breadfruit initially derived from breadnut (not dugdug). Unseeded cultivars derived later from seeded. Vegetative propagation required for long voyages b/c seeds are short lived. 14
24 Support for A. mariannensis (dugdug) A. camansi (breadnut) A. altilis (breadfruit) Breadnut Origin Does archeological evidence help explain this pattern? Lapita reach Hawaii 1700 ybp Dugdug range Breadnut range Lapita: ybp Seeded, sexual cultivars initially. Today both seeded and unseeded exist. Unseeded, asexual cultivars derived. Today primarily unseeded exist here. Lapita reach Easter Island 1700 ybp 2. Lapita carry/trade breadfruit into Micronesia. Hybridization of sexual forms with dugdug. 15
25 A bit of the hybrid hypothesis (original Hyp 3): A. mariannensis (dugdug) A. camansi (breadnut) A. altilis (breadfruit) Breadnut origin A. camansi (breadnut) A. altilis (breadfruit) A. mariannensis (dugdug) Hybrid Origin Does archeological evidence help explain this pattern? Lapita reach Hawaii 1700 ybp Dugdug range Breadnut range Lapita: ybp Seeded, sexual cultivars initially. Today both seeded and unseeded exist. Unseeded, asexual cultivars derived. Today primarily unseeded exist here. 3. Hybrid breadfruits dispersed/traded out of Micronesia. Lapita reach Easter Island 1700 ybp 16
26 Does archeological evidence help explain this pattern? Lapita reach Hawaii 1700 ybp Dugdug range Breadnut range Lapita: ybp Seeded, sexual cultivars initially. Today both seeded and unseeded exist. Unseeded, asexual cultivars derived. Today primarily unseeded exist here. Lapita reach Easter Island 1700 ybp 4. Limited trade/dispersal of hybrid breadfruits south into original breadfruit range, followed by backcrossing with pure breadnut-contributed breadfruits. 17
Molecular Systematics & Ethnobotany Case Study: Breadfruit
Molecular Systematics & Ethnobotany Case Study: Breadfruit Thanks to Tim Motley & Nyree Zerega for pictures and information. Hawaii, California, Bering Straight Bounty-hunting Pandora s Box Breadfruit
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