INVESTIGADORES
POZNER raul Ernesto
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.