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Structural implications for nectar secretion by nectaries of three columnar cacti |
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| รหัสดีโอไอ | |
| Creator | 1. Erick de la Barrera 2. Whaleeha Gudi?o 3. Judith M?rquez-Guzm?n |
| Title | Structural implications for nectar secretion by nectaries of three columnar cacti |
| Publisher | Maejo University |
| Publication Year | 2558 |
| Journal Title | Maejo International Journal of Science and Technology |
| Journal Vol. | 9 |
| Journal No. | 2 |
| Page no. | 156 |
| Keyword | floral morphology,Mexico,nectar,Pachycereae,reproductive ecophysiology,columnar cacti,Polaskia chende,Polaskia chichipe,Stenocereus quevedonis |
| ISSN | 1905-7873 |
| Abstract | Floral nectaries are essential for plant reproduction. Their position and shape are important because these factors determine the amount of nectar secreted and therefore the pollinators that are attracted. The main objective of this study is to determine the position, shape and macromorphology of floral nectaries for three columnar cacti, namely Polaskia chende, P. chichipe and Stenocereus quevedonis. By means of light microscopy, scanning electron microscopy and histochemical tests, the floral nectar-secreting structures were investigated. Different secreting structures were found for the three species, with S. quevedonis having the largest nectar secreting area consisting of stomates located at the base of the stem filaments (1.9 mm2). The nectar secretory pores of P. chichipe measured 0.93 mm2, while the cuticular fissures of P. chende measured 0.8 mm2. For the case of these three species, the surface available for nectar secretion appears to determine the volume of nectar secretion. The relationships between nectarial chamber size, total nectar volume secreted and size of secreting structure found for the three species suggest that the surface area available is the central influential variable that determines the volume of secreted nectar. |
