Floral scents of four Heliotropium (Boraginaceae) species endemic to Chile: a comparative analysis / Aromas florales de cuatro especies de Heliotropium (Boraginaceae) endémicas de Chile: un análisis comparativo
Bol. latinoam. Caribe plantas med. aromát
; 13(2): 171-177, mar. 2014. tab, ilus
Article
in English
| LILACS
| ID: lil-767360
Responsible library:
CL1.1
ABSTRACT
The floral volatile chemicals of four Heliotropium (Boraginaceae) species endemic to Chile are described and their relationship with an Heliotropium phylogeny assessed. Twenty-two compounds were identified; the most prominent family of compounds in H. floridum, H. myosotifolium and H. stenophyllum were benzenoids, and in H. pycnophyllum prominence of benzenoids was shared with two monoterpenes, (E)-Ocymene and 1,8-cineol. The similarity between chemical mixtures of the species significantly decreased with increasing phylogenetic distance between them. Neighbor-joining analysis produced a tree topology with one clade comprised by H. myosotifolium and H. stenophyllum and an unresolved relationship between this clade and H. floridum and H. pycnophyllum; this topology bears a close relationship with molecular phylogeny proposed for the group. These preliminary results presented suggest that the genus Heliotropium complies with the condition of phylogenetically-related floral scent interspecific variation, a key condition in studies of plant-pollinator coevolution mediated by them.
RESUMEN
Se describieron los volátiles florales de cuatro especies de Heliotropium (Boraginaceae) y se evaluó su relación con una filogenia del género. Se identificaron 22 compuestos; los bencenoides fueron los más abundantes en H. floridum, H. myosotifolium and H. stenophyllum, acompañados de dos monoterpenos, el (E)-Ocimeno y el 1,8-cineol, en H. pycnophyllum. La similitud entre los componentes de cada especie aumentó con la distancia filogenética entre ellas. El análisis neighbor-joining produjo un árbol con un clado que contenía a H. myosotifolium y H. stenophyllum y una relación no resuelta entre ese clado y H. floridum y H. pycnophyllum; esta topología guarda similitud con la hipótesis filogenética molecular propuesta para el grupo. Estos resultados preliminares sugieren que el género Heliotropium cumple con la condición de mostrar variación interespecífica en sus volátiles florales, condición básica para estudios de coevolución planta-polinizador mediada por ellos.
Full text:
Available
Collection:
International databases
Database:
LILACS
Main subject:
Benzene Derivatives
/
Heliotropium
/
Monoterpenes
/
Volatile Organic Compounds
/
Odorants
Country/Region as subject:
South America
/
Chile
Language:
English
Journal:
Bol. latinoam. Caribe plantas med. aromát
Journal subject:
Botany
/
Medicine
/
Plantas Medicinais
/
Terapias Complementares
Year:
2014
Document type:
Article
Affiliation country:
Chile
Institution/Affiliation country:
Universidad de Chile/CL