The ontogeny of the pericarp in the subtribe Eugeniinae O. Berg (Myrteae, Myrtaceae) reveals a drupe-like fruit in Myrcianthes pungens (O. Berg) D. Legrand

Sbais, Patrícia Gonçalves; Mazine, Fiorella Fernanda; Thadeo, Marcela; Mourão, Káthia Socorro Mathias

doi:10.1016/j.flora.2021.151969

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…Jossinia (group Y) may be the plesiomorphic condition that persisted in these groups. It is interesting to note that in M. pungens, the fruit is like a drupe, which is a recently recorded trait for this genus (Sbais et al, 2022), and that the seed-coat is mostly made up of slightly thick-walled cells. Results from more comprehensive studies of the fruits and seeds of Myrtaceae that focus on these characters, as well as studies that combine geographic distribution and dispersion, might support these hypotheses.…”

Section: Fruit Opening × Lignified Seed-coatmentioning

confidence: 90%

The anatomy of the seed-coat includes diagnostic characters in the subtribe Eugeniinae (Myrteae, Myrtaceae)

Sbais

Machado²,

Valdemarin³

et al. 2022

Front. Plant Sci.

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The subtribe Eugeniinae comprises of two genera, Eugenia (ca. 1,100 species) and Myrcianthes (ca. 40 species). Eugenia is the largest genus of neotropical Myrtaceae and its latest classification proposes 11 sections. This study describes the seed anatomy of forty-one species of Eugeniinae in order to provide possible diagnostic characteristics. Following standard anatomical techniques, flower buds, flowers, and fruits were processed and analyzed using microtome sections and light microscopy. The phylogeny used the regions ITS, rpl16, psbA-trnH, trnL-rpl32, and trnQ-rps16, following recent studies in the group. Ancestral character reconstruction uncovered that: (1) the ancestral ovule in Eugeniinae was campylotropous (98.9% probability), bitegmic (98.5% probability), and unitegmic ovules arose on more than one lineage independently within Eugenia; (2) the pachychalazal seed-coat appeared with a 92% probability of being the ancestral type; (3) non-lignified seed-coat (24,5% probability) and aerenchymatous mesotesta (45.8% probability) are diagnostic characters in Myrcianthes pungens (aerenchymatous mesotesta present in the developing seed-coat) and in the species of E. sect. Pseudeugenia until the species of E. sect. Schizocalomyrtus and it is the type of seed-coat that predominates in most basal sections on the tree; (4) the partial sclerification (only in the exotesta—exotestal seed-coat) is mainly observed in species of E. sect. Excelsae, E. sect. Jossinia (group X), and E. sect. Racemosae (22.2% probability); (5) and in the species of the recent lineages of Eugenia, with a probability of 27.2%, predominate the exomesotestal or testal construction of the seed-coat [character observed in almost all species analyzed of E. sect. Jossinia (group Y) and E. sect. Umbellatae]. A dehiscent fruit is considered as a plesiomorphic state in Myrtaceae; the ancestor of this family had seeds with a completely sclerified testa, and the other testa types described for the current species with dehiscent and indehiscent fruits are simplified versions of this ancestral type. Perhaps, this means that the sclerified layers in the seed-coat have remained in whole or in part as a plesiomorphic condition for taxa with a capsule and bacca. Maintaining the plesiomorphic condition may have represented a selective advantage at some point in the evolutionary history of the family and its groups.

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Section: Fruit Opening × Lignified Seed-coatmentioning

confidence: 90%

The anatomy of the seed-coat includes diagnostic characters in the subtribe Eugeniinae (Myrteae, Myrtaceae)

Sbais

Machado²,

Valdemarin³

et al. 2022

Front. Plant Sci.

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The complete chloroplast genome sequence of Eugenia klotzschiana O. Berg unveils the evolutionary dynamics in plastomes of Myrteae DC. Tribe (Myrtaceae)

Carvalho

Nunes

Sobreiro

et al. 2023

Gene

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Floral anatomy of 12 species of the subtribe Myrciinae (Myrteae, Myrtaceae)

Carneiro,

Thadeo,

Mourão

2024

Rodriguésia

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Myrciinae, one of the nine subtribes of Myrteae, is a monophyletic group and only includes Myrcia. Phylogenetic studies have culminated in the establishment of sections in this genus supported by floral morphological traits. The anatomy of reproductive organs in Myrteae has proven to be important for understanding the evolution in subtribes. We described the floral anatomy of 12 species of Myrcia in eight of the nine sections to identify characteristics that may be useful for species or section delimitation. Herbarium samples and freshly collected material were processed using standard anatomical techniques. Anatomical aspects in all floral whorls that were similar between the species studied, but may occur in species in other subtribes of Myrteae, are the monocyclic pattern of ovarian vascularization, an outer, median and inner parenchymatic ovarian mesophyll, homogeneous mesophyll in the sepal, and campylotropous ovule. Spongy parenchyma in the petal seems to be the most common pattern for Myrteae, but in Pliniinae, a sister subtribe of Myciinae, homogeneous mesophyll is the most frequent type. The discrete differences observed that should be further explored in the subtribe Myrciinae are the presence or absence of unicellular, non-glandular trichomes in the indumentum of the pedicel, gynoecium, hypanthium, sepal, and petal.

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The ontogeny of the pericarp in the subtribe Eugeniinae O. Berg (Myrteae, Myrtaceae) reveals a drupe-like fruit in Myrcianthes pungens (O. Berg) D. Legrand

Cited by 4 publications

References 30 publications

The anatomy of the seed-coat includes diagnostic characters in the subtribe Eugeniinae (Myrteae, Myrtaceae)

The anatomy of the seed-coat includes diagnostic characters in the subtribe Eugeniinae (Myrteae, Myrtaceae)

The complete chloroplast genome sequence of Eugenia klotzschiana O. Berg unveils the evolutionary dynamics in plastomes of Myrteae DC. Tribe (Myrtaceae)

Floral anatomy of 12 species of the subtribe Myrciinae (Myrteae, Myrtaceae)

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