Karyotype studies of some species ofDalechampiaPlum. (Euphorbiaceae)

Karyotype studies in eight species ofDalechampia, including 10 natural populations, revealed chromosome numbers (2n= 36, 46, 138 and 198) differing from two numbers cited in the literature (2n= 44 and 72). The basic number x = 6, as in the genusAcalypha, may be considered ancestral inDalechampia. An...

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Bibliographic Details
Published inBotanical journal of the Linnean Society Vol. 125; no. 1; pp. 25 - 33
Main Authors VANZELA, A.L.L., RUAS, P.M., MARIN-MORALES, M.A.
Format Journal Article
LanguageEnglish
Published Elsevier Science Ltd 01.09.1997
Subjects
Acalyphoideae
Feulgen
karyotype symmetry
polyploidy
Feulgen
polyploidy
Acalyphoideae
karyotype symmetry
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Summary:Karyotype studies in eight species ofDalechampia, including 10 natural populations, revealed chromosome numbers (2n= 36, 46, 138 and 198) differing from two numbers cited in the literature (2n= 44 and 72). The basic number x = 6, as in the genusAcalypha, may be considered ancestral inDalechampia. Analysis of chromosome number, haploid chromosome length and karyotype symmetry suggests that the major chromosome mechanism acting in karyotype evolution ofDalechampiais polyploidy, but differences in chromosome morphology may be caused by chromosome rearrangements.
ISSN:0024-4074
1095-8339
DOI:10.1006/bojl.1997.0107