Bidirectional anatomical effects in a mistletoe–host relationship: Psittacanthus schiedeanus mistletoe and its hosts Liquidambar styraciflua and Quercus germana

Cocoletzi, Eliezer; Angeles, Guillermo; Ceccantini, Gregório; Patrón, Araceli; Ornelas, Juan Francisco

doi:10.3732/ajb.1600166

Cited by 24 publications

(17 citation statements)

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“…Also, host specificity may be scale dependent, which can explain the apparently contradictory results on the importance of host preferences to genetic differentiation in Phoradendron californicum at different spatial scales (Lira‐Noriega et al ., ; Yule et al ., ). In the present case, scale‐dependent host preferences would explain why Liquidambar (Altingiaceae) appears to be the main host for P. schiedeanus in central Veracruz (López de Buen & Ornelas, ; Kuijt, ; Cocoletzi et al ., ), but is less frequently (or not) infected throughout the rest of its distribution range (Fig. S2).…”

Section: Discussionmentioning

confidence: 99%

“…Adaptive host-race formation has been proposed as a main mechanism of population divergence for parasites in general (de Vienne et al, 2013;Hoberg & Brooks, 2015), and for mistletoes in particular (Norton & Carpenter, 1998;L opez de Buen & Ornelas, 2002;Lara et al, 2009;Ram ırez & Ornelas, 2012). For example, differential survival of P. schiedeanus on different host trees has been attributed to host compatibility (L opez de Buen & Ornelas, 2002;Cocoletzi et al, 2016). L opez de Buen & Ornelas (2002) observed that the parasite's seedling establishment and survival did not vary among different host species, and that differences in survival were only evident during later developmental stages.…”

Section: Discussionmentioning

confidence: 99%

“…We also analyzed environmental layers related to temperature and water availability because these two factors appear to be biologically relevant for plant species in general, and for mistletoe establishment and survival in particular (Cocoletzi et al, 2016). For this, we used data for 12 precipitation and temperature layers obtained from the WorldClim database (Hijmans et al, 2005, http://www.worldclim.org) and two water balance layers (i.e.…”

Section: Geographic Environmental and Host Datamentioning

confidence: 99%

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The influence of climatic niche preferences on the population genetic structure of a mistletoe species complex

et al. 2017

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The prevalent view on genetic structuring in parasitic plants is that host-race formation is caused by varying degrees of host specificity. However, the relative importance of ecological niche divergence and host specificity to population differentiation remains poorly understood. We evaluated the factors associated with population differentiation in mistletoes of the Psittacanthus schiedeanus complex (Loranthaceae) in Mexico. We used genetic data from chloroplast sequences and nuclear microsatellites to study population genetic structure and tested its association with host preferences and climatic niche variables. Pairwise genetic differentiation was associated with environmental and host preferences, independent of geography. However, environmental predictors appeared to be more important than host preferences to explain genetic structure, supporting the hypothesis that the occurrence of the parasite is largely determined by its own climatic niche and, to a lesser degree, by host specificity. Genetic structure is significant within this mistletoe species complex, but the processes associated with this structure appear to be more complex than previously thought. Although host specificity was not supported as the major determinant of population differentiation, we consider this to be part of a more comprehensive ecological model of mistletoe host-race formation that incorporates the effects of climatic niche evolution.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Geographic Environmental and Host Datamentioning

confidence: 99%

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The influence of climatic niche preferences on the population genetic structure of a mistletoe species complex

et al. 2017

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“…Es uno de los géneros más grandes de la familia Loranthaceae. Consta de 119-120 especies (Kuijt, 2009a;Cocoletzi et al, 2016), distribuidas a lo largo del Nuevo Mundo, alcanza su límite norte en la parte central de Baja California (México), con una representación menor en el Caribe (Jamaica y algunas de las Antillas Menores) y numerosas especies en elevaciones bajas y medias en Sudamérica (Bolivia y norte de Argentina).…”

Section: Introductionunclassified

El género Psittacanthus (Loranthaceae) en Veracruz, México

2018

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Antecedentes y Objetivos: El género Psittacanthus es el más grande de la familia Loranthaceae, habita en zonas templadas y tropicales del Nuevo Mundo, con un amplio grupo de hospederos. El objetivo de este trabajo fue determinar las especies presentes en el estado de Veracruz, México.Métodos: Se revisaron los especímenes de Psittacanthus colectados en Veracruz y depositados en los herbarios ENCB, MEXU y XAL. La determinación de los mismos se realizó utilizando las claves de diferentes tratamientos taxonómicos y floras, con el apoyo de colectas y observación de las especies en campo.Resultados clave: Se lograron identificar las características morfológicas que permiten diferenciar a las cuatro especies de Psittacanthus distribuidas en Veracruz. Con esto, se resuelve la confusión que se tenía para distinguir a los taxa de este género en el estado. Además, se presenta una clave para diferenciarlos, una descripción, fotografías y mapas de distribución de cada uno de ellos.Conclusiones: Con este trabajo se lograron esclarecer las confusiones entre las especies del género Psittacanthus que se distribuyen en Veracruz, excluyendo así mismo a P. americanus que otros autores han citado para el estado.

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“…Nicaragua represents a gap in its distribution and the Northern and Southern populations show some morphological differentiation (Kuijt 2009). The species parasitizes over 20 different hosts Cocoletzi, Angeles, Ceccantini, Patrón, & Ornelas, 2016) and it is considered part of a species complex involving P. calyculatus (DC.) G. Don, P. breedlovii Kuijt, and P. angustifolius Kuijt (Diaz-Infante, Lara, del Coro Arizmendi, Eguiarte, & Ornelas, 2016;Pérez-Crespo et al, 2017).…”

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confidence: 99%

Floral anatomy of the plant Psittacanthus schiedeanus (Loranthaceae)

Robayo

Marquínez

Raz

et al. 2019

RBT

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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.

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Bidirectional anatomical effects in a mistletoe–host relationship: Psittacanthus schiedeanus mistletoe and its hosts Liquidambar styraciflua and Quercus germana

Abstract: The bidirectional effects between the parasite and its hosts comprise modifications in secondary phloem that are potentially affected by the phenology of its hosts, a combination of hormonal agents such as auxins, and the symplasmic or apoplasmic pathway for solutes import.

Cited by 24 publications

References 56 publications

The influence of climatic niche preferences on the population genetic structure of a mistletoe species complex

The influence of climatic niche preferences on the population genetic structure of a mistletoe species complex

El género Psittacanthus (Loranthaceae) en Veracruz, México

Floral anatomy of the plant Psittacanthus schiedeanus (Loranthaceae)

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