Diversity and Evolution Diversity and Evolution of Monocots of Monocots . . . . . . palms, spiderworts palms, spiderworts , bananas, , bananas, and and pineapples pineapples . . . . . . Commelinids Commelinids 4 main groups: 4 main groups: • Acorales Acorales - sister to all monocots - sister to all monocots • Alismatids Alismatids – inc. Aroids - jack in the pulpit inc. Aroids - jack in the pulpit • Lilioids (lilies, orchids, yams) Lilioids (lilies, orchids, yams) – non-monophyletic non-monophyletic – petaloid petaloid • Commelinids Commelinids – Arecales Arecales – palms palms – Commelinales Commelinales – spiderwort spiderwort – Zingiberales Zingiberales –banana banana – Poales Poales – pineapple pineapple – grasses & sedges grasses & sedges Commelinids Commelinids • strongly monophyletic! strongly monophyletic! • bound bound ferulic acid ferulic acid in cell walls in cell walls (fluoresce under UV with (fluoresce under UV with ammonium hydroxide added) ammonium hydroxide added) • this feature allowed placement of this feature allowed placement of Dasypogonaceae Dasypogonaceae • largest group of monocots ranging largest group of monocots ranging from palms to grasses from palms to grasses Commelinids Commelinids Dasypogonaceae Dasypogonaceae 4 genera - W Australia 4 genera - W Australia
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Commelinids Diversity and Evolution of Monocots · Lodoicea maldivica - Seychelles palm or double nut Great morphological diversity: largest seed of seed plants Lodoicea maldivica.
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Diversity and EvolutionDiversity and Evolutionof Monocotsof Monocots
•• bound bound ferulic acidferulic acid in cell walls in cell walls(fluoresce under UV with(fluoresce under UV withammonium hydroxide added)ammonium hydroxide added)
•• this feature allowed placement of this feature allowed placement ofDasypogonaceaeDasypogonaceae
•• largest group of monocots ranging largest group of monocots rangingfrom palms to grassesfrom palms to grasses
CommelinidsCommelinids
DasypogonaceaeDasypogonaceae
4 genera - W Australia4 genera - W Australia
CommelinidsCommelinids•• theme: reduction of flower, loss of theme: reduction of flower, loss ofnectar, loss of zoophily, evolution ofnectar, loss of zoophily, evolution ofbractsbracts
pickeral weedpickeral weed
rapateadrapatead
grassgrass
bromeliadbromeliad
*Arecaceae - palms*Arecaceae - palms•• the order has one family - also the order has one family - alsocalled Palmaecalled Palmae
•• 190 genera and 2400 species of 190 genera and 2400 species oftrees and shrubstrees and shrubs
*Arecaceae - palms*Arecaceae - palms•• greatest center of diversity in greatest center of diversity inMalay archipelago, thenMalay archipelago, thenAmazoniaAmazonia
•• depauperate in Africa, but depauperate in Africa, butdiverse in Madagascardiverse in Madagascar
MalaysiaMalaysia
MadagascarMadagascar
*Arecaceae - palms*Arecaceae - palms•• Rattan palms - a plant group that honors the Wallace Rattan palms - a plant group that honors the WallaceBiogeographic LineBiogeographic Line
•• Asian distribution with few species passing through Sulawesi Asian distribution with few species passing through Sulawesior New Guineaor New Guinea
SyagrusSyagrus - lilliput palm of Paraguay - lilliput palm of Paraguay JubaeaJubaea - Chilean wine palm - Chilean wine palm
Great morphological diversity: Great morphological diversity: in staturein stature
*Arecaceae - palms*Arecaceae - palms
Lodoicea maldivicaLodoicea maldivica - Seychelles palm or double nut - Seychelles palm or double nut
Great morphological diversity: Great morphological diversity: largest seed of seed plantslargest seed of seed plants
Lodoicea maldivicaLodoicea maldivica - Seychelles palm or double nut - Seychelles palm or double nut
This genus of 1 species endemic to the Seychelles has generatedThis genus of 1 species endemic to the Seychelles has generatedinterest in having the largest seed, and in that the shape of theinterest in having the largest seed, and in that the shape of theseed has suggested the devil's work or aphrodisiacal properties.seed has suggested the devil's work or aphrodisiacal properties.
What is unusualWhat is unusualabout how thisabout how thisspecies was firstspecies was firstdiscovered?discovered?
*Arecaceae - palms*Arecaceae - palmsGreat morphological diversity: Great morphological diversity: largest leaflargest leaf
RaffiaRaffia - rattan - rattan. . . and. . . and largest inflorescence largest inflorescence
Palm House at Kew RoyalPalm House at Kew RoyalBotanic Garden - largestBotanic Garden - largestglass house in the worldglass house in the worldwith the largest glass housewith the largest glass houseplant - Chilean wine palmplant - Chilean wine palm
CommelinidsCommelinids•• theme: reduction of flower, loss of theme: reduction of flower, loss ofnectar, loss of zoophily, evolution ofnectar, loss of zoophily, evolution ofbractsbracts
•• 2 closely related tropical orders 2 closely related tropical orders•• primarily nectar bearing but with losses primarily nectar bearing but with losses•• bracted inflorescences bracted inflorescences
Family of small herbs with succulentFamily of small herbs with succulentstems, stems jointed; leavesstems, stems jointed; leavessheathing. Family does not producesheathing. Family does not producenectar, but showy flowers for insectnectar, but showy flowers for insectpollen gathering.pollen gathering.
Commelina communisCommelina communis - day flower - day flower
CA 3 CO 3 A 6 CA 3 CO 3 A 6 GG (3) (3)
Commelinaceae - spiderwortCommelinaceae - spiderwort•• species rich in pantropics, species rich in pantropics,especially Africaespecially Africa
•• floral diversity is enormous floral diversity is enormous
Pontederiaceae - pickerel weedPontederiaceae - pickerel weedAquatic family of emergents or floaters.Aquatic family of emergents or floaters.Water hyacinth (Water hyacinth (EichhorniaEichhornia) from) fromtropical America is invasive species intropical America is invasive species insubtropical areas of the world.subtropical areas of the world.
Pickerel weed has glossy heart-shaped leaves,Pickerel weed has glossy heart-shaped leaves,superficially like superficially like SagittariaSagittaria but without net venation. but without net venation.Flowers are in congested showy purple inflorescences.Flowers are in congested showy purple inflorescences.
Flowers are showy, insectFlowers are showy, insectpollinated with nectar glands -pollinated with nectar glands -previously placed in Liliales!previously placed in Liliales!
Small family with floral nectar,Small family with floral nectar,species radiations in Australia andspecies radiations in Australia andSouth AfricaSouth Africa
ZingiberalesZingiberales•• strongly supported group of 8 tropical strongly supported group of 8 tropicalfamiliesfamilies
•• rhizomatousrhizomatous monocots with showy, monocots with showy,nectared, but highly bracted flowersnectared, but highly bracted flowers
DNA-based Zingiberales DNA-based Zingiberales ““rhizogramrhizogram”” by John Kress by John Kress
•• order fairly well known based on DNA and morphology order fairly well known based on DNA and morphology
•• show interesting trends in (1) show interesting trends in (1) fusion of perianthfusion of perianth and (2) and (2) stamenstamenlossloss and staminode development and staminode development
CostusCostus floral pattern floral pattern
3 fused sepals3 fused sepals3 separate petals3 separate petals5 fused sterile anthers5 fused sterile anthers(labellum)(labellum)1 fertile anther1 fertile anther
SS SS
SS
PP
PP PPAA
AAAA
AAAAAA
Poales I - showy flowersPoales I - showy flowers4 main groups:4 main groups:
•• Acorales Acorales - sister to all monocots- sister to all monocots•• Alismatids Alismatids
–– inc. Aroids - jack in the pulpit inc. Aroids - jack in the pulpit•• Lilioids (lilies, orchids, yams) Lilioids (lilies, orchids, yams)
*Bromeliaceae - pineapples*Bromeliaceae - pineapples•• mainly mainly epiphyticepiphytic, but terrestrial as well in, but terrestrial as well ininhospitable regionsinhospitable regions
•• scales very visible in scales very visible inSpanish mossSpanish moss
Tillandsia usneoidesTillandsia usneoides ininSouth Carolina live oaksSouth Carolina live oaks
*Bromeliaceae - pineapples*Bromeliaceae - pineapples•• preadaptations to preadaptations to carnivorycarnivory in in BrocchiniaBrocchinia and andCatopsisCatopsis
*Bromeliaceae - pineapples*Bromeliaceae - pineapples•• inflorescence heavily bracted and often the inflorescence heavily bracted and often theattractantattractant
*Bromeliaceae - pineapples*Bromeliaceae - pineapples CA 3 CO 3 A 6 CA 3 CO 3 A 6 GG (3) or G (3) (3) or G (3)
____
•• petals showy, but not the sepals petals showy, but not the sepals
•• 2 sets of 3 stamens 2 sets of 3 stamens
•• superior or inferior ovary, with superior or inferior ovary, withtwisted stylestwisted styles
1 species of Pitcairnia in west Africa -vicariance or dispersal?
•• bromeliads are an American family: 2600 species, 56 bromeliads are an American family: 2600 species, 56generagenera
guavaguava
*Bromeliaceae - pineapples*Bromeliaceae - pineapples•• pineapple not native to Hawaii - along with two other pineapple not native to Hawaii - along with two otheringredients of Hawaiian Punchingredients of Hawaiian Punch
passion fruitpassion fruit
*Bromeliaceae - pineapples*Bromeliaceae - pineapples•• classification traditionally had three subfamilies classification traditionally had three subfamilies
•• BrocchiniaBrocchinia sister to rest sister to restof familyof family
•• origin of family in origin of family inGuayana ShieldGuayana Shield of South of SouthAmericaAmerica
*Bromeliaceae - pineapples*Bromeliaceae - pineapplesGuayana HighlandsGuayana Highlands of southern of southernVenezuela and adjacent areas ofVenezuela and adjacent areas ofBrazil and Colombia - the higherBrazil and Colombia - the higherelevation elevation ““tepuistepuis”” are rain are raindrenched and extremely nutrientdrenched and extremely nutrientpoorpoor
*Bromeliaceae - pineapples*Bromeliaceae - pineapplesWhen did theWhen did theAtlantic disjunctionAtlantic disjunctionoccur?occur?
•• African speciesAfrican speciesoriginated from Andesoriginated from Andes!!
Where did theWhere did theAfrican speciesAfrican speciescome from?come from?
Rapateaceae - a tepui familyRapateaceae - a tepui family•• 16 genera and nearly 100 species from the Guayana Shield 16 genera and nearly 100 species from the Guayana Shield
Rapateaceae - a tepui familyRapateaceae - a tepui family•• most species are pollinated by pollen-gathering bees most species are pollinated by pollen-gathering bees
•• hummingbird pollination has evolved once in a clade of two hummingbird pollination has evolved once in a clade of twogeneragenera
Is the African Is the African MascolocephalusMascolocephalus a product of Atlantic a product of Atlanticvicariance with closest Guayana Shield relatives, or avicariance with closest Guayana Shield relatives, or a
product of long distance dispersal?product of long distance dispersal?
Rapateaceae - a tepui familyRapateaceae - a tepui family•• most species in the Guayana Shield most species in the Guayana Shield but one in west Africabut one in west Africa
Recent long distance dispersal to Africa!Recent long distance dispersal to Africa!African species divergence is 8-6 myAfrican species divergence is 8-6 mywhereas Atlantic separation is 80+ myawhereas Atlantic separation is 80+ mya
Rapateaceae - a tepui familyRapateaceae - a tepui family