Pollen aperture heteromorphism in<i>Centaurium pulchellum</i>(Gentianaceae)

Piré, Stella Maris; Dematteis, Massimiliano

doi:10.1080/00173130601101245

Cited by 15 publications

(7 citation statements)

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“…These patterns are similar to those found by Ferguson (1980) in Ceratonia . In Centaurium pulchellum, low fertility is associated with irregular pollen aperture types, leading Pire and Dematteis (2007) to suggest that the presence of a successive series of aperture patterns might result from volume changes in the pollen grains, produced either in response to occupation of new habitats or variation in the humidity of the existing environment. Six tropical rainforest species of Bauhinia s.s. have pollen with increased aperture numbers, and the aperture number is variable (4–6 colpate) within samples of each species (Banks et al, 2013, 2014).…”

Section: Resultsmentioning

confidence: 99%

Pollen structure and function in caesalpinioid legumes

Banks

Rudall

2016

American J of Botany

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Section: Resultsmentioning

confidence: 99%

Pollen structure and function in caesalpinioid legumes

Banks

Rudall

2016

American J of Botany

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“…Angiosperms display surprisingly frequent variability of pollen morphological characteristics such as grain size and shape, aperture number and pollen wall architecture (exine thickness and ornamentation pattern) which are likely to affect fertilization success, as different morphologies are favoured in different local competitive and ecological environments (Wodehouse, 1959;Erdtman, 1966;Dajoz et al, 1991;Pire and Dematteis, 2007). Pollen grains of angiospermous plants have been divided into two fundamental types: monoaperturate pollen or its derivatives, and triaperturate pollen or its derivatives.…”

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“…Pollen may differ between individuals of a population (polymorphism) or within the same plant (heteromorphism: production of multiple types of fertile pollen grains in individual species). Amongst the various sorts of variation of pollen morphological features that occur within and between populations of the same species, as well as within individual plants, variation in the number, as well as arrangement and dispensation of apertures (opening or thinning of the exine of a pollen grain through which a pollen tube may germinate) appear to be the most common type of variation (Mignot et al, 1994;Pire and Dematteis, 2007), especially within the eudicots, such as Fabaceae (Ferguson, 1980;Pardo, 1990), Gentianaceae (Erdtman et al, 1961;Punt and Nienhuis, 1976;Rao and Chinnappa, 1983a;Dıez, 1987;Makino, 1991;Pire and Dematteis, 2007), Clusiaceae (Clarke, 1975), Krameriaceae (Pozhidaev, 2002), Solanaceae (Till-Bottraud et al, 1995;Ressayre et al, 2002) and Violaceae (Dajoz et al, 1993;Till-Bottraud et al, 1999;Nadot et al, 2000). Humphrey (2016) studied pollen heteromorphism in Thalictrum Tourn.…”

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Pollen heteromorphism in Schleichera Lour. (Sapindaceae), observed in surface soil samples from central India

Quamar¹,

Thakur²,

Singh³

et al. 2021

Acta Palaeobotanica

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Angiosperms display striking variation of pollen morphological features within and between populations of the same species, as well as within individual plants. We describe and illustrate variation of pollen aperture number, which is called pollen heteromorphism, in Schleichera Lour. (Sapindaceae) from surface soil samples collected from central India, based on combined observations from light microscopy (LM) and confocal laser scanning microscopy (CLSM). Tri-zono-parasyncolporoidate pollen grains are, in general, known to occur in Schleichera Lour., but occasional tetra-zono-parasyncolporoidate pollen is also recorded, for the first time, from Chhattisgarh State, central India. Changes in ploidy level (diploidy/polyploidy), chromosome number, the C-value of DNA, completion of meiosis, as well as environmental factors and/or pollination ecology could be driving the occurrence of pollen heteromorphism. The present study could provide insights into the phylogeny and systematics, and has implications for pollen preservation as well.

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“…However, , in a comparative study using phylogenetic analysis of molecular data and other characteristics, including morphology, revealed certain differences in the delineation of the Gentianaceae tribes and subtribes. Recently, few studies have been conducted about pollen morphology, phylogenetic and taxonomic implications of this group (Crespo & Ferreira 2006, Pire & Dematteis 2007, Chassot & Hagen 2008, Via de Pico & Dematteis 2010.…”

Section: Introductionmentioning

confidence: 99%

Pollen morphology of the genera Irlbachia, Tachia, Voyria and Voyriella (Gentianaceae Juss.) found in the Reserva Florestal Adolpho Ducke (Amazonas, Brazil)

Ferreira¹,

Absy²,

Gonçalves-Esteves

2012

Acta Bot. Bras.

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RESUMO(Morfologia polínica dos gêneros Irlbachia, Tachia, Voyria e Voyriella (Gentianaceae Juss.) ocorrentes na Reserva Florestal Adolpho Ducke (Amazonas, Brasil)). Foi realizado um estudo da morfologia polínica de espécies Gentianaceae Juss. ocorrentes na Reserva Florestal Adolpho Ducke, Manaus, Brasil. Os grãos de pólen das espécies estudadas variaram morfologicamente quanto à unidade polínica (tétrades ou mônades), ao tamanho (pequenos, médios e grandes), à forma (oblata, suboblata, oblata-esferoidal, esférica, prolata-esferoidal e prolata, à polaridade (heteropolar, isopolar ou subisopolar), à simetria (bilateral ou radial) e ao número e tipo de aberturas (3-colporados e 1-3 porados). Quanto à ornamentação, foram reconhecidos grãos de pólen com sexina psilada nas espécies de Voyria, microrreticulada em Voyriella parviflora e reticulada heterobrocada em Tachia grandiflora e Irlbachia alata. A exina em I. alata mostrou grande variação na forma e tamanho dos lumens além da formação de clavas de tamanhos variados em áreas de mesocolpo e apocolpo. Em Tachia grandiflora, além de colpos longos, a exina heterobrocada apresentou um aumento do lúmen, em regiões do mesocolpo, diminuindo, consideravelmente, nas áreas do apocolpo. Nas espécies de Voyria, os grãos de pólen mostraram diferença quanto à forma, polaridade e ao número de aberturas, ocorrendo esferoidais, isopolares e 3-porados em Voyria spruceana; prolata/oval, heteropolares e 1-porados em Voyria tenella e oblato/elíptico (reniforme), heteropolares e 2-(3) porados em Voyria aphylla e Voyria caerulea. A variação na morfologia polínica e características exclusivas do gênero têm sugerido que Voyria seja tratada como um táxon único dentro de Gentianaceae. Palavras-chave:Espécies neotropicais, Floresta amazônica, Palinologia, Taxonomia ABSTRACT (Pollen morphology of the genera Irlbachia, Tachia, Voyria and Voyriella (Gentianaceae Juss.) found in the Reserva Florestal Adolpho Ducke (Amazonas, Brazil)). A pollen morphology study of the Gentianaceae Juss. of Reserva Florestal Adolpho Ducke (Manaus, Brazil) was performed. The pollen grains of the studied species varied morphologically in their pollen units (tetrads or monads), size (small, medium and large), shape (oblate, suboblate, oblate spheroidal, spheroidal, prolate spheroidal and prolate), polarity (heteropolar, isopolar or subisopolar), symmetry (bilateral or radial) and number and type of aperture (3-colporate and 1-3porate). In relation to ornamentation, pollen grains had a sexine that was psilate in the Voyria species, microreticulate in Voyriella parviflora and reticulate heterobrochate in Tachia grandiflora and Irlbachia alata. The exine in I. alata showed great variability in the size and shape of the lumina, in addition to clavae of various sizes in the mesocolpium and apocolpium areas. In Tachia grandiflora, besides to long colpi, the heterobrochate exine demonstrated an increase in the lumina in the mesocolpium areas that decreased considerably in the apocolpium areas. In the species of Voyria, the po...

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Pollen aperture heteromorphism inCentaurium pulchellum(Gentianaceae)

Cited by 15 publications

References 27 publications

Pollen structure and function in caesalpinioid legumes

Pollen structure and function in caesalpinioid legumes

Pollen heteromorphism in Schleichera Lour. (Sapindaceae), observed in surface soil samples from central India

Pollen morphology of the genera Irlbachia, Tachia, Voyria and Voyriella (Gentianaceae Juss.) found in the Reserva Florestal Adolpho Ducke (Amazonas, Brazil)

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