The systematic value of pollen morphology in Arthrocereus A. Berger (Cactaceae, Cactoideae)

Gonzaga, Diego Rafael; Souza, Mariana Albuquerque de; Neto, Luiz Menini; Peixoto, Ariane Luna; Mendonça, Cláudia Barbieri Ferreira; Gonçalves-Esteves, Vânia

doi:10.1016/j.revpalbo.2019.06.009

Cited by 9 publications

(6 citation statements)

References 9 publications

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“…Pollen grains described from Argentina are tricolpate, tectate perforated, with perforations or puncta surrounded by a thickening or annuli and also showed spinules of 0.6 or 0.5 µm which were classified as microechinate and nanoechinate respectively. Another genus, Arthrocereus, included in Cactoideae, shows similar pollen morphology as mentioned previously (Gonzaga et al 2019). Moreover, Ruiz-Domínguez et al (2019) examined pollen morphology in several species included in the tribe Hylocereeae.…”

Section: Discussionsupporting

confidence: 75%

Pollen morphology of columnar cacti from Tehuacán-Cuicatlán Valley, Mexico

Gómez-Lizárraga,

Ramírez-Arriaga,

Mendoza-Garfias

et al. 2023

Palynology

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The most important centre of diversity and endemism of columnar cacti in Mexico is the Tehuacán-Cuicatlán Valley (Puebla-Oaxaca states). The aims of this paper are (1) to provide a detailed description of the recent pollen morphology of 19 registered species that are found in this valley and (2) to develop a synoptic table to differentiate groups of species. This synoptic table is based on morphological features of pollen grains and the density of structural and sculptural elements observed using light and scanning electron microscopy. All analysed pollen grains were stenopalynous: isopolar monads, large, tricolpate with perforate tectate exine (sexine-nexine ratio 1:1), columellate structure with pattern of columellae distribution and spinulose sculpture. The spinules were always wider than they were tall. Although the 19 species of columnar cacti analysed in this study show highly similar types of pollen grains, we were able to characterise each of them with combined microscopy techniques.

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Section: Discussionsupporting

confidence: 75%

Pollen morphology of columnar cacti from Tehuacán-Cuicatlán Valley, Mexico

Gómez-Lizárraga,

Ramírez-Arriaga,

Mendoza-Garfias

et al. 2023

Palynology

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“…Another alternative may be a "statistical approach", where the measurement of pollen grains is performed based on a random selection of both the observation fields (in LM or SEM) and the pollen grains per sample per species (e.g. Orsini et al 2006, Gonzaga et al 2019. In this way, the pollen shape would be calculated as the ratio between the means of the length of the polar axis (P) and the equatorial diameter (E).…”

Section: Discussionmentioning

confidence: 99%

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2020

Phytotaxa

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The present study provides novel information about the pollen of Salvia assurgens. Pollen grains were collected and described based on their observed characters by light microscope and scanning electron microscopy. The species is distinguished from other Mexican salvias by having small pollen grains (14.2 × 18.2 μm), thin primary muri (0.2 μm thick), elongated primary lumina (1.03 μm long) and secondary lumina with relatively few perforations (9, range 5-14). Pollen characters are similar to those of the majority of American salvias. Regarding Mexican sages, there has been little palynological research, and only 23 species of 32 examined have been quantitatively studied. Standardization is needed in different aspects of palynological studies, especially in relation to measurement protocols and data analysis, as well as the increased use of scanning electron microscopy (SEM), since the majority of differences among species are provided by SEM microscope observation.

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“…They occur in the shrub and sub-shrub form and have particular habitats. Consequently, they are restricted to localities [24].…”

Section: Study Speciesmentioning

confidence: 99%

An Announced Extinction: The Impacts of Mining on the Persistence of Arthrocereus glaziovii, a Microendemic Species of Campos Rupestres

Pires¹,

Moreira²,

Beirão³

2023

Preprint

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The ironstone outcrops in the rupestrian grasslands, known as cangas, are rich in species of endemic plants. This high endemism and the constant threat because of the area loss and fragmentation make the conservation of the rupestrian grasslands necessary. The rupestrian grasslands that host one of Brazil's largest iron-ore mining areas are Iron Quadrangle. About 89 rare and endangered species of the Iron Quadrangle are exclusive to cangas, including a threatened species Arthrocereus glaziovii. According to the International Union Conservation of Nature (IUCN), this species is considered micro-endemic and endangered and a priority for recovering the Iron Quadrangle's ferruginous rupestrian fields. This work aims to evaluate the potential distribution of A. glaziovii based on abiotic variables and soil elements and characterize the distribution of mining titles that may restrict the areas of occurrence of this species. We used five types of ecological niche model (ENM) algorithms (Bioclim, Domain, MaxEnt, GLM and RandomForest) in two sets of environmental variables for the modeling: 20 climatic variables and 18 edaphic variables. Our results showed that the area of the potential occurrence of A. glaziovii is more extensive and covers areas outside the Iron Quadrangle. However, mining titles currently licensed and in exploration correspond the entire identified area, threatening the species' survival.

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The systematic value of pollen morphology in Arthrocereus A. Berger (Cactaceae, Cactoideae)

Cited by 9 publications

References 9 publications

Pollen morphology of columnar cacti from Tehuacán-Cuicatlán Valley, Mexico

Pollen morphology of columnar cacti from Tehuacán-Cuicatlán Valley, Mexico

Untitled

An Announced Extinction: The Impacts of Mining on the Persistence of Arthrocereus glaziovii, a Microendemic Species of Campos Rupestres

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