Fruit production and floral traits: correlated evolution in <Emphasis Type="Italic">Govenia</Emphasis> (Orchidaceae) |
| |
Authors: | Javier García-Cruz Victoria Sosa |
| |
Institution: | (1) Departamento de Biología Evolutiva, Instituto de Ecología, A. C., Apartado Postal 63, Xalapa, Veracruz, C.P. 91000, Mexico;(2) Herbario Metropolitano, Departamento de Biología, División de Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Apartado Postal 55-535, Mexico, DF, C.P. 09340, Mexico |
| |
Abstract: | The most common estimate of reproductive success in orchids is usually fruit set. Factors such as resource limitation and
certain floral traits may influence reproductive success in animal-pollinated plants. Correlated evolution of reproductive
success vs. seven floral traits (inflorescence length, flower number, flower distribution along inflorescence, dorsal sepal
length, lateral sepal length, flower color, and column position) was studied in eight species of Govenia. Taxa represented three lineages in the genus. Independent contrasts were calculated on a phylogeny inferred from chloroplast
(trnL-F IGS) DNA sequences, and a correlation test and multiple regression were then performed. Two data sets were evaluated, one
including all eight species and another excluding G. utriculata, which is autogamous. The historical analyses showed that there is a correlation between reproductive success and dorsal
sepal length, column position, and flower number, these correlations suggest that changes in these floral traits usually accompany
evolutionary shifts in reproductive success. Multiple regression tests suggest that changes in reproductive success can be
explained by shifts in flower number, inflorescence length, column position and by dorsal sepal length. When phylogeny is
taken into account, our analyses showed that evolutionary shifts in these floral traits were correlated with changes in reproductive
success. Evolutionary correlation between reproductive success and floral traits might be explained by the natural selection
of certain floral phenotypes by pollinators. |
| |
Keywords: | Independent contrasts Correlated evolution Govenia Reproductive success Floral traits Flower display |
本文献已被 SpringerLink 等数据库收录! |
|