Nectar spur evolution in the Mexican lobelias (Campanulaceae: Lobelioideae)

Margaret M. Koopman, Tina J Ayers

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Phylogenetic studies are often hampered by the independent evolution of characters that may potentially obscure relationships. The adaptive significance of the nectar spur and its evolution within the Mexican lobeliads (Campanulaceae) is considered here. The taxonomic delimitations of Heterotoma from the Mexican species within the genera Lobelia and Calcaratolobelia were tested. Independent molecular data were gathered to determine whether the Mexican spurred lobeliads should be treated as distinct genera. The internal transcribed spacer (ITS) region from 18-26S nuclear rDNA and chloroplast DNA from the 3′ trnK intron were sequenced from 14 representative species. Our data suggest that Heterotoma, as originally conceived, is a good evolutionary unit within Lobelia and that the presence of a nectar spur is an important morphological character that can be used in defining phylogenetic position. This study also suggests that morphological changes associated with hummingbird pollination have evolved more than once in the Mexican lobeliads, from small blue-flowered, insect-pollinated relatives.

Original languageEnglish (US)
Pages (from-to)558-562
Number of pages5
JournalAmerican Journal of Botany
Volume92
Issue number3
StatePublished - Mar 2005

Fingerprint

Lobelia
Campanulaceae
Plant Nectar
nectar
Chloroplast DNA
phylogenetics
Pollination
hummingbirds
phylogeny
Ribosomal DNA
chloroplast DNA
pollination
chloroplast
nuclear genome
Introns
internal transcribed spacers
Insects
introns
insect
DNA

Keywords

  • 3′ trnK intron
  • Heterotoma
  • ITS
  • Lobelia
  • Nectar spur
  • Pollination
  • Systematics

ASJC Scopus subject areas

  • Plant Science

Cite this

Nectar spur evolution in the Mexican lobelias (Campanulaceae : Lobelioideae). / Koopman, Margaret M.; Ayers, Tina J.

In: American Journal of Botany, Vol. 92, No. 3, 03.2005, p. 558-562.

Research output: Contribution to journalArticle

@article{541a2e545b40444eb8c53340ebc1d0af,
title = "Nectar spur evolution in the Mexican lobelias (Campanulaceae: Lobelioideae)",
abstract = "Phylogenetic studies are often hampered by the independent evolution of characters that may potentially obscure relationships. The adaptive significance of the nectar spur and its evolution within the Mexican lobeliads (Campanulaceae) is considered here. The taxonomic delimitations of Heterotoma from the Mexican species within the genera Lobelia and Calcaratolobelia were tested. Independent molecular data were gathered to determine whether the Mexican spurred lobeliads should be treated as distinct genera. The internal transcribed spacer (ITS) region from 18-26S nuclear rDNA and chloroplast DNA from the 3′ trnK intron were sequenced from 14 representative species. Our data suggest that Heterotoma, as originally conceived, is a good evolutionary unit within Lobelia and that the presence of a nectar spur is an important morphological character that can be used in defining phylogenetic position. This study also suggests that morphological changes associated with hummingbird pollination have evolved more than once in the Mexican lobeliads, from small blue-flowered, insect-pollinated relatives.",
keywords = "3′ trnK intron, Heterotoma, ITS, Lobelia, Nectar spur, Pollination, Systematics",
author = "Koopman, {Margaret M.} and Ayers, {Tina J}",
year = "2005",
month = "3",
language = "English (US)",
volume = "92",
pages = "558--562",
journal = "American Journal of Botany",
issn = "0002-9122",
publisher = "Botanical Society of America Inc.",
number = "3",

}

TY - JOUR

T1 - Nectar spur evolution in the Mexican lobelias (Campanulaceae

T2 - Lobelioideae)

AU - Koopman, Margaret M.

AU - Ayers, Tina J

PY - 2005/3

Y1 - 2005/3

N2 - Phylogenetic studies are often hampered by the independent evolution of characters that may potentially obscure relationships. The adaptive significance of the nectar spur and its evolution within the Mexican lobeliads (Campanulaceae) is considered here. The taxonomic delimitations of Heterotoma from the Mexican species within the genera Lobelia and Calcaratolobelia were tested. Independent molecular data were gathered to determine whether the Mexican spurred lobeliads should be treated as distinct genera. The internal transcribed spacer (ITS) region from 18-26S nuclear rDNA and chloroplast DNA from the 3′ trnK intron were sequenced from 14 representative species. Our data suggest that Heterotoma, as originally conceived, is a good evolutionary unit within Lobelia and that the presence of a nectar spur is an important morphological character that can be used in defining phylogenetic position. This study also suggests that morphological changes associated with hummingbird pollination have evolved more than once in the Mexican lobeliads, from small blue-flowered, insect-pollinated relatives.

AB - Phylogenetic studies are often hampered by the independent evolution of characters that may potentially obscure relationships. The adaptive significance of the nectar spur and its evolution within the Mexican lobeliads (Campanulaceae) is considered here. The taxonomic delimitations of Heterotoma from the Mexican species within the genera Lobelia and Calcaratolobelia were tested. Independent molecular data were gathered to determine whether the Mexican spurred lobeliads should be treated as distinct genera. The internal transcribed spacer (ITS) region from 18-26S nuclear rDNA and chloroplast DNA from the 3′ trnK intron were sequenced from 14 representative species. Our data suggest that Heterotoma, as originally conceived, is a good evolutionary unit within Lobelia and that the presence of a nectar spur is an important morphological character that can be used in defining phylogenetic position. This study also suggests that morphological changes associated with hummingbird pollination have evolved more than once in the Mexican lobeliads, from small blue-flowered, insect-pollinated relatives.

KW - 3′ trnK intron

KW - Heterotoma

KW - ITS

KW - Lobelia

KW - Nectar spur

KW - Pollination

KW - Systematics

UR - http://www.scopus.com/inward/record.url?scp=14644435813&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=14644435813&partnerID=8YFLogxK

M3 - Article

C2 - 21652434

AN - SCOPUS:14644435813

VL - 92

SP - 558

EP - 562

JO - American Journal of Botany

JF - American Journal of Botany

SN - 0002-9122

IS - 3

ER -