Pollen, Tapetum and Orbicule Development in Modiolastrum malvifolium (Malvaceae)

Galati, Beatriz Gloria; Monacci, Federico; Gotelli, Marina María; Rosenfeldt, Sonia

doi:10.1093/aob/mcm011

Cited by 21 publications

(21 citation statements)

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“…The presence or absence of orbicules is not reported in Cabomba aquatica , Nuphar pumila , or Nymphaea alba . Orbicules are almost exclusively associated with secretory tapeta (Furness and Rudall, 2001), although exceptions do exist (Lombardo and Carraro, 1976; Galati et al, 2007). The presence of orbicules in water lilies with invasive tapeta may indicate that the secretory function is not completely lost in those species.…”

Section: Discussionmentioning

confidence: 99%

Pollen structure and development in Nymphaeales: Insights into character evolution in an ancient angiosperm lineage

Taylor

Cooper

Schneider

et al. 2015

American J of Botany

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Section: Discussionmentioning

confidence: 99%

Pollen structure and development in Nymphaeales: Insights into character evolution in an ancient angiosperm lineage

Taylor

Cooper

Schneider

et al. 2015

American J of Botany

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“…In the secretory tapetum, the inner cell wall directed towards the loculus and the radial walls dissolve using a natural protoplasting event to facilitate the secretory function. Orbicules or Ubisch bodies are secreted towards the loculus by the tapetum cytoplasm; their function is not yet elucidated and only unproven hypotheses as to their role have been put forward [99][100][101].…”

Section: The Importance Of the Anther Tapetummentioning

confidence: 99%

The Trials and Tribulations of the Plant Male Gametophyte — Understanding Reproductive Stage Stress Tolerance

Pacini¹

2016

Abiotic and Biotic Stress in Plants - Recent Advances and Future Perspectives

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Yield and productivity of many crop species depend on successful reproductive development to produce seeds or fruits for human nutrition. Plants determine the right time to flower based on environmental cues (day length, temperature) and angiosperms have evolved a plethora of mechanisms to adapt flowering to specific environmental conditions. Despite these adaptation mechanisms, fertilisation and seed production remain subject to the reigning weather conditions before and during flowering. To fertilise the immobile female gametes inside the ovule, the male gametophytes need to be dispersed in a hostile environment. In crop plants, unexpected inclement weather conditions during male gametophyte development and pollen dispersal are often associated with dramatic yield losses. Molecular and physiological studies are gradually making progress in identifying genes and processes that control various aspects of pollen development, but the many intricacies involved in environmental control of pollen development and-in particular-regulation of male fertility remain poorly understood. The aim of this paper is to draw attention to the enormous amount of complexity and biodiversity that exist in angiosperm male gametophyte development. A better understanding of the strategies that exist in adapting pollen production and fertility to environmental challenges may ultimately benefit improvement of abiotic stress tolerance in major food crops.

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“…(Tabla 1, Figura 1) en agosto de 2008. En cada sitio se colectó una muestra de agua en el margen derecho del río (mayor accesibilidad) y a 1 metro de la orilla, las que se conservaron en frascos pastilleros de 200 ml con solución FAA (formaldehído: etanol: ácido acético: agua, 10:50:5:35; Galati et al, 2007). Las muestras se trasladaron al laboratorio de Ecología y Biodiversidad Animal de la Escuela Profesional de Biología, Facultad de Ciencias Naturales y Matemática, Universidad Nacional Federico Villarreal (EPB-FCCNM-UNFV), para su análisis.…”

Section: áRea De Estudiounclassified

Diversidad De Fitoplancton Como Indicador De Calidad De Agua en La Cuenca Baja Del Río Lurín, Lima, Perú

2016

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ResumenSe establecieron seis sitios de muestreo (P) entre los 5 m.s.n.m. (P1) y 31 m.s.n.m. (P6) en la cuenca baja del río Lurín, Lima, Perú en agosto de 2008, para evaluar las características físicas y químicas del agua, y determinar su calidad en base a la diversidad de microalgas y cianobacterias presentes. Se registraron cinco especies de cianobacterias y 89 especies de microalgas distribuidas en cuatro divisiones, donde Bacillariophyta fue la más abundante con 72% del total de especies. El 31.2% de las especies identificadas correspondió a los géneros Navicula, Fragilaria, Nitzschia y Synedra. Un total de 29 géneros y 55 especies fueron identificados exclusivamente en uno de los sitios. Se evidenció una disminución gradual de la similitud desde las dos estaciones más alejadas de la desembocadura (39.3%) hasta las dos más cercanas (18.2%). La mayor conductividad evaluada se presentó a los 31 m.s.n.m. con 1 820 µS.cm -1 y la mínima a los 5 m.s.n.m. con 1 390 µS.cm -1 . Los valores más bajos de pH fueron registrados en los sitios más altos (6.2; 6.1), y el valor máximo a 8 m.s.n.m. (8.2) presentándose así una correlación inversa entre ambas variables. La temperatura máxima del agua fue de 23ºC, y la mínima fue de 16ºC guardando una relación directa con la altitud. El aumento de los niveles de recambio con la distancia espacial entre los sitios de muestreo deja clara la sensibilidad de las microalgas y cianobacterias a los cambios ambientales. Estos cambios se reflejan en una alta mineralización del sistema y bajos niveles de pH en el agua, y se deben principalmente a causas antropogénicas. Palabras clave: Abundancia, Bacillariophyta, Cyanobacteria, microalgas, río Lurín, sensibilidad, similitud. AbstractSix sampling points (P) were established from 5 to 31 meters above sea level in the lower basin of the Lurin River, in august 2008, to evaluate the physical and chemical characteristics of water, and to determine how water quality relates to diversity of microalgae and Cyanobacteria. Five species of Cyanobacteria were recorded and 89 species of microalgae from four divisions were encountered. Bacillariophyta was the most abundant division and accounted for 72% of all species. The genera Navicula, Fragilaria, Nitzschia and Synedra accounted for 31.2% of the total identified species. A total of 29 genera and 55 species were identified exclusively from one of the sampling points. A gradual decrease of the similarity from the two stations with higher altitude (39.3%) to the two lower stations (18.2%) was evident. The highest conductivity value was recorded at 31 meters above sea level (1820 μS.cm ) and the lowest at 5 meters above sea level (1390 μS.cm -1 ). The lowest pH values were registered at higher elevations (6.2; 6.1), and the maximum value at 8 meters above sea level (8.2); this shows an inverse correlation between both variables. Temperature values ranged from 23°C to 16°C and it was directly related to altitude. Replacement levels, which increase with increasing spatial distance between sampling points, ...

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Pollen, Tapetum and Orbicule Development in Modiolastrum malvifolium (Malvaceae)

Cited by 21 publications

References 1 publication

Pollen structure and development in Nymphaeales: Insights into character evolution in an ancient angiosperm lineage

Pollen structure and development in Nymphaeales: Insights into character evolution in an ancient angiosperm lineage

The Trials and Tribulations of the Plant Male Gametophyte — Understanding Reproductive Stage Stress Tolerance

Diversidad De Fitoplancton Como Indicador De Calidad De Agua en La Cuenca Baja Del Río Lurín, Lima, Perú

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