Selbyana 18(1): 85-88

CHROMOSOME NUMBERS IN

GREGORY K. BROWN! AND CARLOS A. PALACf Department of , University of Wyoming, Laramie, Wyoming 82071

HARRY E. LUTHER Marie Selby Botanical Gardens, 811 South Palm Avenue, Sarasota, Florida 34236

ABSTRACT. Chromosome numbers are reported for 44 taxa from Bromeliaceae, including first reports for three genera (Hohenbergia, Lymania, Quesnelia), and first reports for 27 addition~ s1?ecie~. The ~eporte~ numbers are all diploid (2n = 50), except for Ananas ananassoides (2n = 75), a tnplOld, Tillandsza butZll (2n = 100), a tetraploid, and Fosterella villosula (2n = 150), a hexaploid. These chromosome numb.ers support the proposed base chromosome number of x = 25. for extant Bromeliac~ae: Hypotheses concermng the evolution of chromosome base number in the BromelIaceae are evaluated In lIght of recent molecular evidence suggesting that the Rapateaceae and Bromeliaceae may be sister taxa.

INTRODUCTION meliaceae, still an unverified n = 16 for Til­ landsia usneoides (Billings 1904), reinforced the Chromosome numbers have been published bias for x = 8. McWilliams (1974), for example, for approximately 220 of the nearly 3,000 bro­ suggested that an ancestor with x = 8 produced meliad , and Brown and Gilmartin (1986, the x = 25 bromeliad lineage through successive 1989a) have summarized the systematic signifi­ rounds of polyploidy, followed by ascending an­ cance of these numbers. However, no chromo­ euploidy. In contrast, Brown and Gilmartin some numbers are available for nearly half of (1989a) proposed the origin of a dibasic x = 17 the genera (Le., Abromeitiella, Androlepis, Ay­ lineage, via hybridization of x = 8 and x = 9 ensua, Brewcaria, , , Cot­ parental types, followed by a second hybridiza­ tendorfia, Deinacanthon, Disteganthus, Encho­ tion with an x = 8 lineage, to produce x = 25. Urium, Fascicularia, Fernseea, Greigia, Hoh­ This latter hypothesis was parsimonious within enbergiopsis, MezobromeUa, Navia, Neoglaziov­ the phylogenetic constraints of Dahlgren's Bro­ ia, Ochagavia, Pseudaechmea, Orthophytum, meliiftorae (Dahlgren et al. 1985). Moreover, Ronnbergia, Steyerbromelia, Ursulaea, Wit­ two lines of indirect evidence seemed to support trockia). the Brown and Gilmartin (1989a) hypothesis. Marchant (1967) was the first to suggest x = First, cladistic analyses of morphological char­ 25 as the base chromosome number for Bro­ acters show the Velloziaceae (x = 9) to be close­ meliaceae, and subsequent work continues to ly related to the Bromeliaceae (Gilmartin & support that proposal (Goldblatt 1980, Brown et Brown 1987), an affinity that had been suggest­ al. 1984, Varadarajan & Brown 1985, Brown & ed by Huber (1977). Second, a base chromo­ Gilmartin 1989a). This distinctive base chro­ some number of x = 17 for Cryptanthus (Mar­ mosome number, together with results from re­ chant 1967), accorded with the hypothetical di­ cent morphological (Brown & Gilmartin 1988, basic hybrid-level in the Brown and Gilmartin 1989b) and molecular studies (Ranker et al. (1989a) hypothesis. 1990, Clark et al. 1993, Duvall et al. 1993) re­ This paper reports on an ongoing meiotic inforce the long-held notion (e.g., Smith 1934) chromosome number survey within the Brome­ that the Bromeliaceae is monophyletic. liaceae, and evaluates the issue of base number The origin of the x = 25 base number for the evolution in light of recent molecular data in­ bromeliads has been problematic, mainly be­ dicating that Bromeliaceae and Rapateaceae cause putative, closely related families (e.g., may be sister taxa. Velloziaceae) have chromosome base numbers of x = 8 or x = 9 (Dahlgren & Rasmussen 1983, Dahlgren et al. 1985, Gilmartin & Brown 1987, MATERIALS AND METHODS Goldblatt & Poston 1988). Hypotheses concern­ Floral buds were obtained from cultivated ing the derivation of x = 25 have, consequently, specimens at Marie Selby Botanical Gardens, been devised assuming a putative sister taxon Sarasota, Florida (SEL), or from the field. See with a base number of 8 or 9. Furthermore, the Brown and Gilmartin (1989a) for a description first published chromosome number from Bro- of the bud collecting and chromosome squash protocols. Locations for voucher herbariu~ I Author for correspondence. specimens are indicated in TABLE 1. All graphic

85 86 SELBYANA [Volume 18(1)

TABLE 1. Bromeliaceae chromosome number reports.

Taxon 2n= Voucher Collection origin bromeliifolia (Rudge) Baker 50 Brown 3137 (RM) , Goias Aechmea fulgens Brongniart var. dis- 50 SEL 87-0458 (SEL) ex hort color (c. Morren) Brongniart ex Baker Ananas ananassoides (Baker) L. B. 75 Brown 3129 (RM) Brazil, Goias Smith aAraeococcus flagellifolius Harms 50 SEL 78-0683 (SEL) "Araeococcus pectinatus L. B. Smith 50 SEL 82-0531 (SEL) Brazil, Roraima bHohenbergia pennae Pereira 50 SEL 83-0258 (SEL) Brazil, ex hort bLymania globosa Leme 50 SEL 86-0428 (SEL) Brazil, Bahia bLymania smithii R. W. Read 50 SEL 89-572 (SEL) Brazil, Bahia bQuesnelia liboniana (De Jonghe) Mez 50 SEL 83-0051 (SEL) Brazil, Rio de Janeiro "Fosterella villosula (Harms) L. B. 150 SEL 80-0854 (SEL) Bolivia Smith Pitcaimia andreana Linden 50 SEL 75-0077-043 (SEL) Colombia aPitcaimia archeri L. B. Smith 50 Brown 2727 (RM) Colombia, Quibdo aPitcaimia arcuata (Andre) Andre 50 Brown 2865 (RM) Ecuador, Morono-Santiago apitcairnia armata Maury 50 SEL 84-0303 (SEL) Venezuela, Amazonas Pitcaimia atrorubens (Beer) Baker 50 SEL 78-2205 (SEL) Nicaragua aPitcaimia cosangaensis Gilmartin 50 Brown 2857 (RM) Ecuador, Morona-Santiago aPitcaimia fusca H. Luther 50 Brown 2902 (RM) Ecuador, Pichincha 'Pitcaimia imbricata (Brongniart) Re- 50 Palaci 1243 (RM) Guatemala, San Felipe gel Pitcaimia maidifolia (c. Morren) De- 50 SEL 82-0542 (SEL) Peru, San Martin caisne 'Pitcaimia palmoides Mez & Sodiro 50 Brown 2898 (RM) Ecuador, Pichincha aPitcaimia smithiorum H. Luther 50 SEL 89-0004 (SEL) Peru, Loreto aGuzmania mucronata (Grisebach) Mez 50 SEL 88-0005 (SEL) Venezuela, Falcon aGuzmania patula Mez & Werckle 50 SEL 75-0090-029 (SEL) Venezuela, Aragua Guzmania rhonhofiana Harms 50 SEL 76-0044-041 (SEL) Ecuador, Cotopaxi aTillandsia acostae Mez & Tonduz ex 50 Peterson & Anable 7082 (WS) Mexico Mez aTillandsia adpressa Andre 50 Brown 2901 (RM) Ecuador, Pichincha anceps Loddiges 50 SEL 86-0885 (SEL) Costa Rica, Puntarenas 'Tillandsia arhiza Mez 50 Brown 3127 (RM) Brazil, Goias aTillandsia butzii Mez 100 SEL 80-1580 (SEL) Mexico, Chiapas Tillandsia caput-medusae E. Morren 50 Mazariego 26 (RM) El Salvador, Santa Ana 'Tillandsia cf. didisticha (E. Morren) 50 Brown 3117 (RM) Brazil, Goias Baker Tillandsia dodsonii L. B. Smith 50 SEL 73-0004-033 (SEL) Ecuador, Pichincha 'Tillandsia dyeriana Andre 50 SEL 82-0215 (SEL) Ecuador, Esmeraldas "Tillandsia friesii Mez 50 Palaci 1165 (RM) Argentina, Salta "Tillandsia hamaleana E. Morren 50 SEL 80-1132 (SEL) Ecuador, Pichincha Tillandsia monadelpha (E. Morren) 50 SEL 80-0676 (SEL) Costa Rica, Puntarenas Baker aTillandsia muhriae Weber 50 Palaci 1192 (RM) Argentina, Salta 50 Palaci 1200 (RM) Bolivia, Tupiza aTillandsia multicaulis Steudel 50 Mazariego 36 (RM) El Salvador, Santa Ana Tillandsia polystachia (L.) L. 50 SEL 76-0026-066 (SEL) Mexico, Jalisco Tillandsia venusta Mez & Werckle 50 SEL 76-0044-039 (SEL) Ecuador, Cotopaxi aTillandsia zecheri Till var. cafayaten- 50 Palaci 1172 (RM) Argentina, Salta sis Palaci & G. Brown aVriesea heterandra (Andre) L. B. 50 Brown 2875 (RM) Ecuador, Morona-Santiago Smith 'Vriesea malzinei E. Morren 50 SEL 81-2346 (SEL) Mexico aVriesea cf. sanguinolenta Cogniaux & 50 Palaci 1222 (RM) Costa Rica, Guanacaste Marchal

a First chromosome number reported for species. b First chromosome number reported for . 1997] BROWN ET AL.: BROMELIACEAE CHROMOSOMES 87 documentation of chromosomes is at the Rocky of Tillandsia (T. castellanii, T. gilliesii, T. hirta, Mountain Herbarium (RM). Taxonomic nomen­ T. loliacea; Till 1984). Furthermore, putative tet­ clature follows Smith and Downs (1974, 1977, raploids (e.g., 2n = 84, 89, 92, 96, 97), also 1979), as updated by Luther and Sieff (1991). determined form mitotic material, have been re­ ported for 15 additional Tillandsia subgenus REsULTS Diaphoranthema species (Lindschau 1933, Tschischow 1956, Gauthe 1965, Till 1984). We report chromosome counts for 44 taxa, in­ However, see Brown and Gilmartin (1986) for a cluding 30 first reports (TABLE 1) for Bromeli­ discussion of possible problems associated with aceae. mitotic root tip chromosome reports from epi­ phytic bromeliads. Bromelioideae

The chromosome number reports for Hohen­ DISCUSSION bergia, Lymania, and Quesnelia, all n = 25, are the first documented for these genera. The chro­ The chromosome numbers reported here sup­ mosome numbers for Aechmea bromeliifolia and port Marchant's (1967) proposal that x = 25 is Aechmea fulgens var. discolor confirm previous­ the base number for Bromeliaceae. The database ly published reports (Lindschau 1933; Lind­ of bromeliad chromosome numbers (Brown, un­ schau 1933 and Marchant 1967, respectively). publ., available on request) is now large enough Triploidy has also been documented in Ananas that new data on chromosome numbers in the ananassoides, a taxon previously reported as family will probably not change this view. We diploid (2n = 50, Collins 1960, Brown & Gil­ still lack chromosome numbers, however, for Illartin 1989a). Triploids are known in Ananas, Illany genera. with repeated documentation in the cultivated The earliest hypotheses about the base chro­ pineapple, Ananas comosus (L.) Merrill (Heil­ mosome number for Bromeliaceae (Lindschau born 1921, Collins & Kerns 1931, Collins 1933). 1933, Weiss 1965, Sharma & Ghosh 1971, McWilliams 1974) were guided by lowest-com­ Pitcairnioideae mon-denominator derivations (e.g., 2n = 48 in­ terpreted as a hexaploid based on x = 8). In The chromosome numbers for Pitcaimia an­ contrast, Brown and Gilmartin (1989a) formu­ and confirm dreana, P. atrorubens, P. maidifolia lated their model of chromosome number evo­ previously published numbers (Lindschau 1933, lution based on the then-held notion of a poten­ and Brown et al. 1984; Marchant 1967, and Var­ tial sister taxon relationship between the Bro­ adarajan & Brown 1985, respectively). We re­ meliaceae and the Velloziaceae (e.g., Huber port polyploidy in the Pitcairnioideae from mei­ otic material for the second time, a hexaploid 1977, Dahlgren & Rasmussen 1983, Dahlgren et al. 1985, Gilmartin & Brown 1987, Ranker et al. (2n = 150) in Fosterella villosula. The pub­ lished chromosome numbers for three other spe­ 1990). Nevertheless, this model is no longer ten­ cies of Fosterella are diploid (2n = 50; Brown able. Recent molecular phylogenetic studies, us­ et al. 1984, Brown & Gilmartin 1989a) and hex­ ing rbcL sequences, indicate the Rapateaceae to aploid ( penduliflora = F. penduliflo­ be the most likely sister taxon to Bromeliaceae, ra; Marchant 1967). and place Velloziaceae in a distant clade (Clark et al. 1993, Duvall et al. 1993). The only known chromosome number for Ra­ Tillandsioideae pateaceae is 2n = 22 for the genus Maschalo­ Chromosome numbers for the following spe­ cephalus (Mangenot & Mangenot 1957). Based cies agree with earlier reports: Guzmania rhon­ on this single report, Sharma (1972) assigned x hofiana (Marchant 1967), Tillandsia anceps = 11 as the base number for the family, although (Marchant 1967), T. dodsonii (Brown & Gil­ Maschalocephalus is unique in being the only martin 1989a), T. monadelpha (Marchant 1967, African genus in this otherwise South American Brown & Gilmartin 1989a), and T. venusta assemblage of 16 genera. Therefore, we believe (Brown et al. 1984). The tetraploid level in Til­ that comments about base chromosome numbers landsia butzii is the third report of polyploidy in the Rapateaceae, and their relationship to base from meiotic material in the Tillandsioideae; the number evolution in the Bromeliaceae, are pre­ first two were obtained from T. capillaris and T. mature and overly speculative. More informa­ tricholepis (Brown & Gilmartin 1989a). Tetra­ tion is needed about chromosome numbers from ploidy (2n = 100) has been reported from mi­ Rapateaceae before chromosomal evolution in totic chromosome preparations for four species Bromeliaceae can be addressed. 88 SELBYANA [Volume 18(1)

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