Palynological study of heterostylous species of Melochia L. (Byttinerioideae-Malvaceae) occurring in Bahia, Brazil

Júnior, Cristiano Eduardo Amaral Silveira; Lima, Luciene Cristina Lima e; Saba, Marileide Dias

doi:10.1016/j.revpalbo.2015.07.005

Cited by 5 publications

(2 citation statements)

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“…However, some of the data presented here for Ceiba erianthos (e.g., short columellae and thicker intine at the apertural region) are in agreement with those reported for other species of Malvaceae s.l. (Saba & Santos 2015;Silveira-Júnior et al 2015;2017). Robyns (1963) and Salgado-Labouriau (1973) described the pollen grains of the species of Eriotheca studied here and reported similar pollen characteristics.…”

Section: Discussionmentioning

confidence: 99%

Morphological characterization of pollen grains of Brazilian species of Bombacoideae (Malvaceae s.l.)

et al. 2020

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The pollen grains of 15 species belonging to five genera (Ceiba Mill., Eriotheca Schott & Endl., Pachira Aubl., Pseudobombax Dugand, and Rhodognaphalopsis A. Robyns) of the subfamily Bombacoideae (Malvaceae s.l.) were acetolysed, measured, described and photomicrographed under light microscopy and scanning and transmission electron microscopy, in order to characterize the pollen morphology of species of the subfamily occurring in Brazil. The pollen characters studied were size, shape, exine constitution, and apertural type. Pollen grains were medium to large-sized and isopolar with a (sub)circular and (sub)triangular amb with flat, convex or concave sides; oblate to suboblate; 3(-4)-colp(or)ate or 4-5(-6)-colporate, planaperturate, sinuaperturate; equatorial calottes different or not; exine tectate or semitectate, perforate and microreticulate with or without supratectal spines. The results confirm the eurypalynous nature of the group with variation among the studied genera being mainly in the exine pattern.

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Section: Discussionmentioning

confidence: 99%

Morphological characterization of pollen grains of Brazilian species of Bombacoideae (Malvaceae s.l.)

et al. 2020

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“…The chemical treatment of the samples followed the protocol used by Silveira-Júnior et al (2015). Briefly, non-acetolyzed pollen grains were fixed in glutaraldehyde (2.5 %) in 0.1 M sodium cacodylate buffer solution, washed in a sodium cacodylate buffer solution and post-fixed in osmium tetroxide (1 %), potassium ferricyanide (0.8 %), and 5 mM calcium chloride in sodium cacodylate buffer.…”

Section: Pollen Morphology Of Waltheria L (Malvaceae-byttnerioideae)mentioning

confidence: 99%

Pollen morphology of Waltheria L. (Malvaceae-Byttnerioideae) from Bahia, Brazil

2017

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Waltheria encompasses about 60 species distributed in Brazil and Mexico. To improve the palynology of the genus, we analyzed 14 species occurring in the Brazilian State of Bahia. Pollen grains were acetolyzed and examined using light microscopy and scanning electron microscopy. Non-acetolyzed pollen grains were viewed by transmission electron microscopy. Th e results revealed two general pollen types based on exine ornamentation, such as reticulate and echinate, which are distinct with regard to (1) size and shape, (2) apertural type and number, (3) relative length of ectoapertures, and (4) thickening of the nexine compared to the sexine. An ultrastructural analysis of the pollen wall revealed a continuous foot layer and a compact and discontinuous endexine in most cases. Th e sexine consisted of heterogeneous columellae, which support a perforated semitectum (echinate type) or the semitectum was composed of perforations and muri-shaped thickening (reticulate type). Th ese results confi rm a high degree of pollen dimorphism in Waltheria associated with heterostyly.

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