Chromosome evolution and cytotaxonomy of South American species of tribe Vernonieae (Asteraceae)
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1 Chromosome evolution and cytotaxonomy of South American species of tribe Vernonieae (Asteraceae) Massimiliano Dematteis Instituto de Botánica del Nordeste Corrientes - Argentina
2 Vernonieae (Asteraceae) Elephantopus Eremanthus Lychnophora Pacourina 124 genera and more than 1500 species tropical and subtropical regions of Asia, Africa and America mostly centered in southern Brazil Vernonia was traditionally the largest genus, with about species In South America grow ca. 380 species Mostly distributed in south of Brazil, northern Argentina, Paraguay y Bolivia Centratherum Vernonia
3 Economic Uses Epoxy resin extraction Vernonia galamensis (Cass.) Less. Vernonia anthelmintica (L.) Willd. weeds toxic species Lessingianthus rubricaulis (Humb. & Bonpl.) H.Rob. Vernonanthura chamaedrys (Less.) H.Rob. Lessingianthus mollissimus (D.Don) H.Rob.
4 Biological Forms Vernonanthura patens (Kunth) H.Rob. Vernonanthura brasiliana (L.) H.Rob. Lessingianthus platyphyllus (Chodat) H.Rob. Lessingianthus brevifolius (Less.) H.Rob.
5 Heads and Inflorescences Vernonia incana Less. Lessingianthus glabratus (Less.) H.Rob. Eirmocephala megaphylla (Hieron.) H.Rob. Vernonanthura pseudolinearifolia (Hieron.) Vega & Dematt. Vernonanthura patens (Kunth) H.Rob.
6 Lessingianthus brevifolius (Less.) H.Rob. Lessingianthus longicuspis Dematt. heads discoid, homogamous florets bisexual, fertile, isomorphic corollas tubular, 5-lobed, lobes with similar size style slender with filiform branches, bearing long sweeping hairs florets reddish to purplish, rarely white involucre composed by several series of closely imbricate phyllaries Cyrtocymura scorpioides (Lam.) H.Rob.
7 Vernonia Schreb., Gen. Pl. 2: Benth. & Hook., Gen. Pl. 2(1): New World Critoniopsis (Sch.Bip.) Benth. & Hook. Eremosis DC. Hololepis (DC.) DC. Leiboldia (Schtdl.) Benth. & Hook. Lepidaploa (Cass.) DC. Stenocephalum (Sch.Bip.) Benth. & Hook. Tephrodes DC. Old World Baccharoides Moench Cyanopis Blume Distephanus Cass. Gymnanthemum Cass. Lepidella Oliv. & Hiern. Stengelia Steetz Trianthea DC. Xipholepis Steetz
8 Vernonia sect. Lepidaploa (Cass.) DC. Bentham & Hooker (1873) Baker (1873) Cabrera (1944) Robinson (1999) subsect. Macrocephalae subsect. Brevifolia subsect. Macrocephalae subsect. Remotiflorae p.p. Lessingianthus subsect. Macrolepidae subsect. Sellowiinae subsect. Oligocephalae subsect. Oligocephalae subsect. Flexuosae Chrysolaena subsect. Scorpioideae verae subsect. Scorpioideae subsect. Scorpioides Cyrtocymura subsect. Scorpioideae axilares subsect. Axilliflorae subsect. Remotiflorae p.p. Lepidaploa subsect. Glomeratae subsect. Glomeratae subsect. Chamaedrys Vernonanthura subsect. Paniculatae subsect. Paniculatae subsect. Nudiflorae subsect. Nitidulae subsect. Polyanthes subsect. Laurifoliae Quechualia
9 Characters commonly considered In some cases Inflorescence type Size of the inflorescence bracts Florets per capitulum Phyllaries shape Indumentum type Pollen morphology Floral microcharacters Chemical composition Number and morphology of chromosomes? Vernonanthura loretensis (Hieron.) H.Rob.
10 Chromosome numbers in Vernonieae First chromosome count Chrysolaena platensis (Spreng.) H.Rob. (2n=40)
11 First comprehensive analysis in Vernonieae Jones, Bull. Torrey Bot. Club 106: Asia and Africa x=9 and x=10 America x=17 aneuploidy x=9 polyploidy + aneuploidy x=10 x=17
12 Current Cytological Information n = Nro Basic Chromosome Numbers x=9, x=10, x=14, x=15, x=16, x=17, x=19, x=31 and x=33 Dematteis, Bot. J. Linn. Soc. 139: Angulo & Dematteis, Pl. Syst. Evol., in press.
13 Chrysolaena (Vernonia subsect. Oligocephalae) (18 spp.) C. lithospermifolia (Hieron.) H.Rob. n=10 II, 2n=2x=20 C. propinqua (Hieron.) H.Rob. 2n=2x=20 2,5 µm C. flexuosa (Sims) H.Rob. n=20 II, 2n=4x=40 C. verbascifolia (Less.) H.Rob. 2n=2x=20
14 Chrysolaena cognata (Less.) Dematt. 2,5 µm 2n=2x=20 2n=4x=40 2n=5x=50 2n=6x=60 2n=8x=80
15 Chrysolaena C. flexuosa (Sims) H.Rob. C. sceptrum (Chodat) Dematt. C. lithospermifolia (Hieron.) H.Rob. C. cognata (Less.) Dematt. C. verbascifolia (Less.) H.Rob. C. propinqua (Hieron.) H.Rob. 2 µm 2 µm majority of metacentric chromosomes, accompanied by 4-6 submetacentric pairs. chromosome size between 2,1 and 2,6 µm.
16 Idiograms of four cytotypes of Chrysolaena cognata C. cognata (Less.) Dematt. diploid 12m + 8sm. tetraploid 24m + 16sm. hexaploid 36m + 24sm. octoploid 48m + 32sm 2 µm
17 Morphology of the four cytotypes of Chrysolaena cognata diploid tetraploid hexaploid octoploid
18 Vernonanthura (Vernonia subsect. Paniculatae) (90 spp.) V. nudiflora (Less.) H.Rob. n=17 II V. amplexicaulis (R.E.Fr.) H.Rob. n=17 II V. nudiflora (Less.) H.Rob. 2n=2x=34 V. chamaedrys (Less.) H.Rob. 2n=2x=34 V. squamulosa (Hook. & Arn.) H.Rob. 2n=2x=34 V. ferruginea (Less.) H.Rob. 2n=2x=34
19 Vernonanthura V. loretensis (Hieron.) H.Rob. 2n=2x=34 V. montevidensis (Less.) H.Rob. 2n=2x=34 V. pinguis (Griseb.) H.Rob. 2n=4x=68 V. polyanthes (Less.) Vega & Dematt. 2n=2x=34
20 Vernonanthura V. amplexicaulis (R.E.Fr.) H.Rob. V. montevidensis (Less.) H.Rob. V. chamaedrys (Less.) H.Rob. V. nudiflora (Less.) H.Rob. V. ferruginea (Less.) H.Rob. V. pinguis (Griseb.) H.Rob. V. polyanthes (Less.) Vega & Dematt. V. loretensis (Hieron.) H.Rob. V. squamulosa (Hook. & Arn.) H.Rob. 2 µm 2 µm most of metacentric chromosomes with 5-7 of submetacentric pairs. chromosome size between 1,6 and 2,3 µm.
21 Lessingianthus (Vernonia subsect. Macrocephalae) (125 ssp.) L. onopordioides (Less.) H.Rob. 2n=2x=32 L. brevifolius (Less.) H.Rob. 2n=2x=32 L. coriaceus (Less.) H.Rob. 2n=2x=32 L. durus (Mart.) H.Rob. 2n=2x=32 L. heringeri (H.Rob.) H.Rob. 2n=2x=32 L. saltensis (Hieron.) H.Rob. 2n=4x=64 L. pumillus (Vell.) H.Rob. 2n=4x=64
22 Lessingianthus L. polyphyllus (Sch.Bip.) H.Rob. 2n=4x=64 L. mollissimus (D.Don) H.Rob. 2n=4x=64 L. pulverulentus (Mart.) H.Rob. 2n=6x=96 L. intermedius (DC.) Dematt. 2n=4x=64 L. teyucuarensis (Cabrera) Dematt. 2n=10x=160
23 Lessingianthus L. brevifolius (Less. H.Rob. L. onopordioides (Less.) H.Rob. L. coriaceus (Less.) H.Rob. L. rubricaulis (Humb. & Bonpl.) H.Rob. L. durus (Mart. ex DC.) H.Rob. L. sellowii (Less.) H.Rob. 2 µm L. polyphyllus (Sch.Bip.) H.Rob. 2 µm most of metacentric chromosomes, 3-5 submetacentric and occasionally 1-2 subtelocéntric pairs. average chromosome size between 1,30 and 1,80 µm.
24 Lessingianthus rubricaulis (Humb. & Bonpl.) H.Rob. sens. lat. 2n=2x=32 2n=4x=64 L. pseudoincanus (Hieron.) H.Rob.
25 L. laniferus (Cristób. & Dematt.) Angulo L. pusillus (Dematt.) Angulo L. rubricaulis (Humb. & Bonpl.) H.Rob.
26 Lepidaploa (Vernonia subsect. Axilliflorae) (140 ssp) L. remotiflora (L.C.Rich.) H.Rob. n=14 II L. grisea (Mart.) H.Rob. 2n=2x=30 L. aurea (Mart. ex DC.) H.Rob. 2n=2x=32 L. eriolepis (Gardner) H.Rob. 2n=2x=32 L. rufogrisea (A.St.-Hil.) H.Rob. 2n=2x=32 L. tarijensis (Griseb.) H.Rob. 2n=2x=32
27 Lepidaploa L. aurea (Mart. ex DC.) H.Rob. L. cotoneaster (Less.) H.Rob. L. remotiflora (L.C.Rich.) H.Rob. L. chalybea (Mart. ex DC.) H.Rob. L. grisea (Mart.) H.Rob. L. eriolepis (Gardner) H.Rob. 2 µm L. lilacina (Less.) H.Rob. L. tarijensis (Griseb.) H.Rob. most of metacentric chromosomes, 3-5 submetacentric and rarely 1-2 subtelocentric pairs. average chromosome size 1,6-1,8 µm (x=16), 1,5-1,6 µm (x=15) and 1,1-1,2 µm (x=14).
28 Cyrtocymura (Vernonia subsect. Scorpioideae) (5 ssp) 3 µm C. cincta (Griseb.) H.Rob. 2n=2x=62 C. scorpioides (Lam.) H.Rob. 2n=2x=66 st st 2 µm metacentric, submetacentric and some subtelocentric pairs. chromosome size 1,6-1,8 µm. Dematteis, Bonplandia 10:
29 Acilepidopsis (Vernonia echitifolia Mart. ex DC.) (1 spp.) 2n=8x=72 5 µm most of metacentric chromosomes, some submetacentric and several subtelocentric pairs. average chromosome size 1,9-2 µm. Dematteis & Robinson, Phytologia 83:
30 Mesanthophora (Vernonia rojasii Cabrera) (2, 1) 2n=4x=36 5 µm Dematteis & Salgado, Comp. Newsl. 36:
31 Basic chromosome numbers in different genera Baker (1873) Robinson (1999) subsect. Macrocephalae Lessingianthus x=16 subsect. Oligocephalae Chrysolaena x=10 subsect. Scorpioideae Cyrtocymura x=31, 33 subsect. Axilliflorae Lepidaploa x=14, 15, 16 subsect. Glomeratae Vernonanthura x=17 subsect. Paniculatae Quechualia x=17 Acilepidopsis x=9 Mesanthophora x=9
32 Basic chromosome number Chromosome size x=9 Ancestral basic number aneuploidy polyploidy aneuploidy x=9 x=10 x=17 1,6-2,3 1, ,6 aneuploidy x=16 1,3-1,8 aneuploidy x=15 1,5-1,6 aneuploidy x=14 1,1-1,2 Dematteis, Bot. J. Linn. Soc. 139:
33 Chromosomes and Taxonomy chromosomes can be an useful tool for taxonomic and evolutionary studies in Vernonieae. the wide variation in basic chromosome numbers of the tribe make possible to group related species. in general, related taxa can be clearly distinguished, because the species show differences in its chromosome complement. Lessingianthus brevifolius (Less.) H.Rob. in most cases, each group presents one or more characteristic basic numbers. the single exception is Lepidaploa, which is evidently heterogeneous from a chromosome viewpoint, which agree with the morphology of the species.
34 Chromosomes and Evolution the more primitive species, with basic chromosome number x=9 or x=10, have greater chromosome size than derived taxa. the diversification of the tribe was followed by a slow decrease in the size of the chromosome. the similarity in the karyotypes within each group, indicates that have occurred very small changes in the structure of the chromosomes. polyploidy and aneuploidy have played an important role in the evolution of the tribe Vernonieae. Lessingianthus barrosoanus Dematt.
35 Muchas gracias por su atención Thank you for your attention Obrigado pela atenção
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