Ultrastructure and cytochemistry of<i>Eucalyptus globulus</i>(Myrtaceae) pollen grain

Eliseu, Susana A.; Dinis, Alexandra

doi:10.1080/00173130801923364

Cited by 14 publications

(5 citation statements)

References 37 publications

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“…Apocolpial island is absent. Eucalyptus pollen size, exine, mesocolpial and apocolpial fields exine on mesocolpia, and margo are diagnostic features for separating Eucalyptus from other Myrtaceae pollen (Pickett & Newsome, 1997) while Eliseu and Dinis (2008) are of the view that typical Eucalyptus could be identified by characteristic triangular shape, parasyncolpate colpi, radial symmetry, and a distinct apocolpial fields.…”

Section: Resultsmentioning

confidence: 99%

Scanning electron imaging of mellitophilous and allergenic pollen grain of arid and northern irrigated agroecological zones of Pakistan

Noor

Ahmad

2021

Microscopy Res & Technique

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Palynomorphic studies of 65 common mellitophilous and 16 allergenic flora of Arid and Northern irrigated agroecological zones of Pakistan are carried out in this study by using field emission scanning electron microscope (FESEM).Mellitophilous pollen were extracted from honey samples of selected sites. For collection of local allergenic pollen, previously identified allergy-causing plants were selected. Pollen morphological examination was carried out under FESEM.Diverse range of pollen shapes ranging from monad to polyad and sculpturing ranging from psilate to echinate, scabrate to reticulate, bireticulate, or echinolophate were observed. Brassicaceae, Myrtaceae, Asteraceae, Rosaceae, and Poaceae were observed to be dominant allergenic and mellitophilous families of the selected sites.

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Section: Resultsmentioning

confidence: 99%

Scanning electron imaging of mellitophilous and allergenic pollen grain of arid and northern irrigated agroecological zones of Pakistan

Noor

Ahmad

2021

Microscopy Res & Technique

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“…The present study examined extant Myrtaceae taxa from the Bega Swamp area with light microscopy and compared images of Myrtaceae pollen grains from various sections of Singh's 1980 core using visual character comparison and a Lucid key of extant Myrtaceae pollen morphology (Thornhill unpublished) with the aim of correlating extant and fossil pollen. Pollen of the plant family Myrtaceae is characterised by a syncolpate or parasyncolpate appearance, although some Myrtaceae tribes are brevicolpate and asyncolpate (Thornhill unpublished data), with many studies conducted on the pollen of the family or specific groups within (Pike 1956;McIntyre 1963;Churchill 1968;Barth and Barbosa 1973;Graham 1980;Gadek and Martin 1981;Gadek and Martin 1982;Patel et al 1984;Van Wyk and Dedekind 1985;Martin and Gadek 1988;Chalson and Martin 1995;Pickett and Newsome 1997;Parnell 2003;Eliseu and Dinis 2008). It has been said that at the generic and species levels, separation of taxa can be difficult or impossible (Pickett and Newsome 1997), but a number of useful and distinctive characters have been created to tackle the task (Dodson 1974;Chalson and Martin 1995).…”

Section: Introductionmentioning

confidence: 99%

Altered Ecologies: Fire, climate and human influence on terrestrial landscapes: Terra Australis 32

Haberle¹,

Stevenson²,

Prebble³

2010

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terra australis 32Terra Australis reports the results of archaeological and related research within the south and east of Asia, though mainly Australia, New Guinea and island Melanesia -lands that remained terra australis incognita to generations of prehistorians. Its subject is the settlement of the diverse environments in this isolated quarter of the globe by peoples who have maintained their discrete and traditional ways of life into the recent recorded or remembered past and at times into the observable present.Since the beginning of the series, the basic colour on the spine and cover has distinguished the regional distribution of topics as follows: ochre for Australia, green for New Guinea, red for South-East Asia and blue for the Pacific Islands. From 2001, issues with a gold spine will include conference proceedings, edited papers and monographs which in topic or desired format do not fit easily within the original arrangements. All volumes are numbered within the same series. Copyright of the text remains with the contributors/authors, 2009. This book is copyright in all countries subscribing to the Berne convention. Apart from any fair dealing for the purpose of private study, research, criticism or review, as permitted under the Copyright Act, no part may be reproduced by any process without written permission. Inquiries should be made to the publisher. Among saltbush greyer than seaweed we boardwalk the yeasting waves of the old golden-perch pond. List of volumes in Terra AustralisRabbit dung dots a lake bottom dry since their coming -only once, last century, after seven inches of rain a farmer had to rescue his sheep by boat.The roo bounces down-slope, a brown branch crackling.The professor's eye, noting the local runoff and what the westerlies do, observes seas that rush in and out of a continent's middle, salt lakes spreading and emptying, hills pimpling up and down with cartoon-like speed, or gullying themselves into extinction, rainforests and deserts zipping back and forth like Tom and Jerry. A human mouse plague swiftly swarms, perhaps soon gone.Impermanent planet. Impermanent surface. All under air and water. The lunette is a wave, a dumper of sand, a collapsing tower in the mad rabbit years when its top blew off and old bones winked through, with a vault's worth of fine stone cores.Once so simply mislaid in sand, now so obligingly sluiced out to the un-subincised world that smiles at stone knives. terra australis 32Altered Ecologies: Fire, climate and human influence on terrestrial landscapes v You might as well offer your table knife to a carpenter.Cane grass and the Dreamtime's stone fight the eroding rivulets together. In today's rare downpour each lost core, or blunted scraper crowns some tiny eroding hillock, plops its anchor in the dissolving silts.The bettong whose skin took off the stone tool's edge has vanished -sacrifice to future fertility.Through the softening soil Homo sapiens's skeleton bumps up like a carp's back.Waits for the wind to shave it off in pieces.A D-section and a ti...

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“…Es posible que los lípidos observados en la superficie interna de la cubierta de los esporocitos se utilicen también en la formación de la esporopolenina del esporodermo (Domínguez, Mercado, Quesada & Heredia, 1999;Piffanelli, Ross & Murphy, 1998, Eliseu & Dinis, 2008Cronk, 2009;Ariizumi & Toriyama, 2011;Wallace, Fleming, Wellman & Beerling, 2011). Las abundantes reservas de lípidos en las esporas de Lycopodiaceae podrían también relacionarse con los largos períodos de latencia de las esporas no clorofílicas, que permanecen en el sustrato por periodos prolongados hasta entrar en contacto con los hongos micorrícicos necesarios para la germinación y desarrollo del gametófito no fotosintético (Raghavan, 1989;Whittier, 1998).…”

Section: Mucopolisacáridos áCidosunclassified

Ontogenia de los esporangios, formación y citoquímica de esporas en licopodios (Lycopodiaceae) colombianos

Barón

Rolleri

Guarin

et al. 2014

RBT

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Ontogeny of the sporangium, spore formation and cytochemistry in Colombian Lycopodials (Lycopodiaceae). Studies on reproductive aspects of Lycopodiaceae are not very abundant in the scientific literature, and constitute essential information to support taxonomic and systematic relationships among the group. Here we present a detailed study of the ontogeny of sporangia and sporogenesis, and the chemical determination of several compounds generated during spore formation. The analyses were performed in 14 taxa of six genera of the family, Diphasiastrum, Diphasium, Huperzia (a genus which is treated here including Phlegmariurus), Lycopodiella, Lycopodium and Palhinhaea. Specimens were collected in three departments from the Colombian Andes between 1 454-3 677m altitude. Ontogeny was studied in small, 1cm long pieces of strobili and axis, which were fixed in glutaraldehyde or FAA, dehydrated in alcohol, embedded in LR White, sectioned in 0.2-0.5μm and stained with toluidine blue (TBO), a metachromatic dye that allows to detect both sporopollenin and lignin or its precursors, during these processes. For other studies, paraplast plus-embedded sections (3-5μm) were stained with safranin-fast green and alcian blue-hematoxylin. Chemical tests were also conducted in sections of fresh sporangia at different stages of maturity using alcian blue (mucopolysaccharides), Lugol solution (starch), Sudan III (lipids), phloroglucinol (lignin) and orcein (chromosomes). Sections were observed with photonic microscope equipped with differential interference contrast (DIC) and fluorescence microscopy (for spore and sporangium walls unstained). Strobili and sporangia were dehydrated with 2.2 dimethoxypropane, critical point dried and coated with gold for scanning electron microscopy (SEM). Our results indicated that the ontogeny of sporangia and sporogenesis were very similar to the previously observed in Huperzia brevifolia. Cutinisation occurs in early stages of development of sporangium cell walls, but in their final stages walls become lignified. As for the sporoderm development, the exospore is the first layer formed, composed by sporopollenin. The endospore deposits as a thin inner layer composed of cellulose, pectin and carboxylated polysaccharides. The perispore, if present, deposits at last. Mucopolysaccharides were found on the sporocyte coat and its abundance in sporangial cavity persists up to the immature tetrads stage, and then disappears. The lipids were abundant in the sporocytes, tetrads and spores, representing the main source of energy of the latter. In contrast, starch is not detected in the spores, but is abundant in premeiotic sporocytes and immature tetrads, developmental stages of high cellular metabolic activity. Intrinsic fluorescence corroborates the presence of lignin and cutin in the sporangium wall, while the sporopollenin is restricted to the exospore. The transfusion cells and the perispore are not always present. However, the processes of ontogeny and sporogenesis are extremely similar througho...

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Ultrastructure and cytochemistry ofEucalyptus globulus(Myrtaceae) pollen grain

Cited by 14 publications

References 37 publications

Scanning electron imaging of mellitophilous and allergenic pollen grain of arid and northern irrigated agroecological zones of Pakistan

Scanning electron imaging of mellitophilous and allergenic pollen grain of arid and northern irrigated agroecological zones of Pakistan

Altered Ecologies: Fire, climate and human influence on terrestrial landscapes: Terra Australis 32

Ontogenia de los esporangios, formación y citoquímica de esporas en licopodios (Lycopodiaceae) colombianos

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