Vacuolar remodelling mediates touch-induced androgynophore movement in Passiflora (Subg. Decaloba, Sect. Xerogona) flowers |
| |
Authors: | Livia CT Scorza Mônica L Rossi Marcelo Carnier Dornelas |
| |
Institution: | 1. Universidade Estadual de Campinas, Instituto de Biologia, Departamento de Biologia Vegetal, Rua Monteiro Lobato, 255, 13083-862 Campinas, SP, Brazil;2. Universidade de São Paulo, Centro de Energia Nuclear na Agricultura, Av. Centenário, 303, 13400-970 Piracicaba, SP, Brazil |
| |
Abstract: | Some species of the genus Passiflora (sect. Xerogona) have flowers that exhibit a mechanically-induced movement of the androgynophore that is probably involved in pollination. Despite the many reports of touch-induced movements of floral parts, the studies concerning anatomical, ultrastructural and molecular aspects of the plant movements are restricted to the vegetative parts. Rapid plant movements are highly dependent on turgor changes of a particular flexible tissue formed by specialized cells capable of losing and gaining water rapidly. Thigmotropic androgynophores of four species of Passiflora from section Xerogona were analyzed at cellular and subcellular levels. Our results show that the movement is due to a vacuolar remodelling in a group of parenchymatous cells at the base of the androgynophore. After the movement, plasmolyzed and multivacuolated cells are present at the stimulated side and turgid and univacuolated cells at the opposite side. The results suggest that the mechanisms leading to the androgynophore movement in Passiflora are, in general, analogous to those reported for the movements of legume pulvinus, motile stamen filaments and guard cells of stomata, pointing to conserved cellular mechanisms of plant movement. |
| |
Keywords: | Pollination Plant movement Subcellular changes Plasmolysis Turgidity |
本文献已被 ScienceDirect 等数据库收录! |
|