IBODA   05360
INSTITUTO DE BOTANICA DARWINION
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Calyx and trichome morphology in Navarretia (Polemoniaceae)
Autor/es:
JENSEN, A. B.; LINDQUIST, S.; POZNER, R.; JOHNSON, L.
Lugar:
Chicago, Illinois
Reunión:
Congreso; Plant Biology & Botany 2007 Conference; 2007
Institución organizadora:
Botanical Society of America
Resumen:
Navarretia circumscribes approximately 35 annual species
distributed primarily in Western North America.
Small in stature and flower, and usually bearing spinescent leaves, Navarretia
species are distinguished by various character combinations that include habit,
bract morphology, calyx morphology, flower morphology and coloration, carpel
number, and stamen position. Two of four recognized sections are well supported
by both morphological and DNA sequence data, while the remaining two sections,
and several unplaced species formerly belonging to the genus Gilia,
are non-monophyletic. To further understand relationships and patterns of
species diversification and character evolution within Navarretia, we
surveyed calyx morphology with an emphasis on trichome diversity and
distribution from representative populations of all but two taxa, including
subspecies. To aid in this study, we defined regions of homology including
inner calyx tube, outer calyx tube, inner lobe, and outer lobe, and further
considered aspects of calyx lobe morphology including size, shape, and the
contribution of foliar base and blade on lobe structure. Our survey shows that,
unlike the relatively uniform trichomes in closely related Allophyllum,
Navarretia possesses a tremendous diversity in both glandular and
eglandular trichomes. In some cases, trichome diversity is congruent with
patterns of relationships suggested by independent data, while in other cases
the converse is true.