Keywords
androecium
annular nectary
calyculus
cupular pedycel
gynoecium
septate anthers
Aetanthus
androceo
anteras septadas
calículo
gineceo
nectario anular
pedicelo acopado
How to Cite
Abstract
Anatomía floral de la planta Psittacanthus schiedeanus (Loranthaceae). Loranthaceae hemiparasitic family comprises 76 genera and about 1 050 species distributed in temperate and tropical regions. The subtribe Psittacanthinae contains 14 genera of neotropical mistletoe including Psittacanthus with over 120 species, characterized by large, brightly colored (red, orange, yellow) flowers that are mostly pollinated by hummingbirds. During the 20th century, a number of morphological and embryological studies were conducted mainly on Old World Loranthaceae genera. More recently, attention has been focused on neotropical Psittacanthinae where among the 14 genera, floral anatomy has been examined in only seven. The aim of this study is to describe the floral anatomy of Psittacanthus schiedeanus and compares the results with those derived from related mistletoe, interpreting the variation of the floral characters of the calyculus, nectary, gynoecium and from floral dissections and serial histological sections, detailing the structure of androecium and gynoecium and anthers in the context of the new phylogenetic information. Flowers of P. schiedeanus at different developmental stages were examined using stained serial sections visualized with light microscopy. These flowers have a vascularized, cupular pedicel fused to a bracteole, a non-vascularized calyculus, an annular nectary, a unilocular gynoecium with a single central mamelon and an androecium formed by epipetalous septate stamens. The morphological comparison of pedicel, bracteole and calyculus provides support for the interpretation of the calyculus as a reduced calyx. The annular nectary seems to be a character shared by the entire subtribe Psittacanthinae, which distinguishes it from Ligarinae which has stylar nectary. The unilocular gynoecium formed by a single central structure is a character shared with other genera in Psittacanthinae except Tripodanthus. The androecium is composed of dithecal, tetrasporangiate stamens with septate locules that are here considered an adaptation for pollen releasing over an extended time period rather than previous suggestions that they result from evolutionary pressure to reduce anther size or to facilitate the nutrition of microspores in large anthers.
References
Baillon, H. E. (1862). Mémoire sur les Loranthacées. Adansonia, 2(3), 30-381.
Barlow, B. A. (1983). Biogeography of Loranthaceae and Viscaceae. In M. Calder & P. Bernhardt (Eds.), The biology of Mistletoes (pp. 19-46). Sidney: Academic Press.
Baumgratz, J. F. A., Souza, M. L. D. R., Woodgyer, E. M., & Nic Lughadha, E. M. (1996). Polysporangiate anthers: described for the first time in Melastomataceae. Kew Bulletin, 51(1), 133-144.
Brown, R. (1827). Prodromus florae Novae Hollandiae et Insulae Van-Diemen: exhibens characteres plantarum (Vol. 3). Taylor, London: Sumtibus L. Schrag.
Brown, R. H., Nickrent, D. L., & Gasser, C. S. (2010). Expression of ovule and integument associated genes in reduced ovules of Santalales. Evolution & Development, 12(2), 231-240.
Cid Villamil, R. M. (2006). Biología del desarrollo de Cladocolea loniceroides (Van Tieghem) Kuijt (Loranthaceae) (Doctoral dissertation). Universidad Nacional Autónoma de México, México, D.F., México.
Cocoletzi, E., Angeles, G., Ceccantini, G., Patrón, A., & Ornelas, J. F. (2016). Bidirectional anatomical effects in a mistletoe- host relationship: Psittacanthus schiedeanus mistletoe and its hosts Liquidambar styraciflua and Quercus germana. American Journal of Botany, 103(6), 986-997.
Cocucci, A. E. (1983). New evidence from embryology in angiosperm classification. Nordic Journal of Botany, 3(1), 67-73.
Cocucci, A. E., & Venturelli, M. (1982). El ovulo y el gineceo en Loranthaceae. Boletín de la Sociedad Argentina de Botánica, 21(1-4), 131-141.
Diaz-Infante, S. D., Lara, C., del Coro Arizmendi, M., Eguiarte, L. E., & Ornelas, J. F. (2016). Reproductive ecology and isolation of Psittacanthus calyculatus and P. auriculatus mistletoes (Loranthaceae). PeerJ, 4, e2491.
Eichler, A. W. (1868). Loranthaceae. In C. F. P. Martius & A. G. Eichler (Eds.), Flora Brasiliensis (Vol. 5, Part 2, pp. 1-136). Leipzig: Fleischer in Comm.
Endress, P. K., & Stumpf, S. (1990). Non-tetrasporangiate stamens in the angiosperms: structure, systematic distribution and evolutionary aspects. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie, 112, 193-240.
Engler, A. (1889). Loranthaceae. In A. Engler & K. Prantl (Eds.), Die Natürlichen Pflanzenfamilien (Vol. 3, pp. 156-198). Leipzig: Wilhelm Engelmann.
Engler, A., & Krause, K. (1935). Angiospermae: Reihen Santalales, Aristolochiales, Balanophorales. In A. Engler & K. Prantl (Ed.), Die natürlichen Planzenfamilien (Vol. 1, pp. 98-203). Leipzig: Wilhelm Engelmann.
Galetto, L., Bernardello, L. M., & Juliani, H. R. (1990). Acerca del nectario, nectar y visitantes florales en Ligaria cuneifolia (Loranthaceae). Darwiniana, 30, 155-161.
Garg, S. (1958). Embryology of Atkinsonia ligustrina (A. Cunn. ex F. Muell.) F. Muell. Nature, 182(4649), 1615-1616.
Gómez-Sánchez, M., Sánchez-Fuentes, L. J., & Salazar-Olivo, L. A. (2011). Anatomía de especies mexicanas de los géneros Phoradendron y Psittacanthus, endémicos del Nuevo Mundo. Revista Mexicana de Biodiversidad, 82(4), 1203-1218.
González, F., & Pabón-Mora, N. (2017). On the supposed polycotyledony and lack of endosperm in Psittacanthus (Loranthaceae). Brittonia, 69(2), 176-185.
Johri, B. M., Agrawal, J. S., & Garg, S. (1957). Morphological and embryological studies in the family Loranthaceae. I. Helicanthes elastica (Desr.) Dans. Phytomorphology, 7(3-4), 336-354.
Johri, M., Ambegaokar, B., & Srivastava, S. (1992). Comparative Embryology of Angiosperms. Berlin: Springer-Verlag.
Kuijt, J. (1967). On the structure and origin of the seedling of Psittacanthus schiedeanus (Loranthaceae). Canadian Journal of Botany, 45(9), 1497-1506.
Kuijt, J. (1975). The genus Cladocolea (Loranthaceae). Journal of the Arnold Arboretum, 56(3), 265-335.
Kuijt, J. (1990). A second species of Ligaria (Loranthaceae). Brittonia, 42(1), 66-69.
Kuijt, J. (2009). Monograph of Psittacanthus (Loranthaceae). Systematic Botany Monographs, 86. American Society Plant Taxonomy, 86, 1-361.
Kuijt, J. (2013). Prophyll, calyculus, and perianth in Santalales. Blumea-Biodiversity, Evolution and Biogeography of Plants, 57(3), 248-252.
Kuijt, J. (2014). A monograph of the genus Aetanthus (Loranthaceae). Plant Diversity and Evolution, 131(1), 1-51.
Kuijt, J. (2018). A rebuttal to a recent article by González and Pabón-Mora (2017) claiming the absence of polycotyly and the presence of endosperm in Psittacanthus (Loranthaceae). Brittonia, 70, 148-149.
Lersten, N. R. (1971). A review of septate microsporangia in vascular plants. Iowa State Journal of Science, 45, 487-497.
Liu, B., Le, C. T., Barrett, R. L., Nickrent, D. L., Chen, Z., Lu, L., & Vidal-Russell, R. (2018). Historical biogeography of Loranthaceae (Santalales): Diversification agrees with emergence of tropical forests and radiation of songbirds. Molecular Phylogenetics and Evolution, 124, 199-212.
Narayana, R. (1958). Morphological and embryological studies in the family Loranthaceae-III. Nuytsia floribunda (Labill.) R. Br. Phytomorphology, 8, 306-323.
Nickrent, D. L. (1997) onwards. The Parasitic Plant Connection. Retrieved from https://parasiticplants.siu.edu
Nickrent, D. L., Anderson, F., & Kuijt, J. (2019). Inflorescence evolution in Santalales: Integrating morphological characters and molecular phylogenetics. American Journal of Botany, 106(3), 402-414.
Nickrent, D. L., Malécot, V., Vidal-Russell, R., & Der, J. P. (2010). A revised classification of Santalales. Taxon, 59(2), 538-558.
Ornelas, J. F., Gándara, E., Vásquez-Aguilar, A. A., Ramírez-Barahona, S., Ortiz-Rodriguez, A. E., González, C., & Ruiz-Sanchez, E. (2016). A mistletoe tale: postglacial invasion of Psittacanthus schiedeanus (Loranthaceae) to Mesoamerican cloud forests revealed by molecular data and species distribution modeling. BMC Evolutionary Biology, 16(1), 78.
Ortiz-Rodriguez, A. E., Guerrero, E. Y., & Ornelas, J. F. (2018). Phylogenetic position of Neotropical Bursera-specialist mistletoes: the evolution of deciduousness and succulent leaves in Psittacanthus (Loranthaceae). Botanical Sciences, 96(3), 443-461.
Pérez‐Crespo, M. J., Ornelas, J. F., González‐Rodríguez, A., Ruiz‐Sanchez, E., Vásquez‐Aguilar, A. A., & Ramírez‐Barahona, S. (2017). Phylogeography and population differentiation in the Psittacanthus calyculatus (Loranthaceae) mistletoe: a complex scenario of climate–volcanism interaction along the Trans‐Mexican Volcanic Belt. Journal of Biogeography, 44(11), 2501-2514.
Prakash, S. (1961). Morphological and Embryological Studies in the Family Loranthaceae - VII Atkinsonia Ligustrina (Cunningh) F. V. Muell. Phytomorphology, 11, 325-335.
Ramírez, M. M., & Ornelas, J. F. (2010). Polinización y producción de néctar de Psittacanthus schiedeanus (Loranthaceae) en el centro de Veracruz, México. Boletín de la Sociedad Botánica de México, 87(87), 61-67.
Robles, A., Raz, L., & Marquínez, X. (2016). Anatomía floral de Peristethium leptostachyum (Loranthaceae). Revista de Biologia Tropical, 64, 341-352.
Suaza-Gaviria, V., Pabón-Mora, N., & González, F. (2016). Development and morphology of flowers in Loranthaceae. International Journal of Plant Sciences, 177, 559-578.
Van Tieghem, M. P. (1895). Sur le groupement des espèces en genres dans les Loranthées a calice dialysépale et anthères oscillantes ou Struthanthées. Bulletin de la Société Botanique de France, 42(2), 161-180.
Venturelli, M. (1981). Embriologia de Struthanthus vulgaris (Loranthaceae-Loranthoideae). Kurtziana, 14, 73-100.
Venturelli, M. (1983). Estudos embriológicos em Loranthaceae: Gênero Tripodanthus. Kurtziana, 16, 71-90.
Venturelli, M. (1984). Morfologia e anatomia floral de Struthanthus vulgaris Mart.(Loranthaceae). Revista Brasileira de Botânica, 7, 121-128.
Wanntorp, L., & Ronse De Craene, L. P. R. (2009). Perianth evolution in the sandalwood order Santalales. American Journal of Botany, 96(7), 1361-1371.
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