Structure and ontogeny of the pericarp of six Eupatorieae (Asteraceae) with ecological and taxonomic considerations

Marzinek, Juliana; Oliveira, Denise María Trombert

doi:10.1590/s0001-37652010000200004

Cited by 31 publications

(16 citation statements)

References 21 publications

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“…Despite having the same swelling mechanism, the two types of tracheids in the pulvinus exhibit drastically different swelling behaviors, which help to generate the directional stress on the pappus. In this case, the pappus exhibits no hydroresponsive behavior because the cell walls of the tracheids have been completely lignified during fruit development …”

Section: Resultsmentioning

confidence: 99%

Hydroactuated Configuration Alteration of Fibrous Dandelion Pappi: Toward Self‐Controllable Transport Behavior

Meng

Wang

Zhao

et al. 2016

Adv Funct Materials

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Stimuli‐responsive materials, especially those inspired by natural organism, have been extensively studied because of their versatile applications. Here, this study demonstrates that the unique hydroactuated reversible configuration alternation of the dandelion pappus, featured by the responsive spatial closing and opening the umbrella‐like pappus depending on the environmental humidity, is a determining factor that allows the pappus to regulate its transport behavior. It is proposed that the anisotropic hydroactuated swelling of tracheids, which are typically arranged with an oblique crossing orientation, helps to generate the directional stress on the pappus. By this strategy, the pappus control its transport behavior in response to the environmental moisture, which allows long‐distance and effective seeds dispersal selectively to local sites for optimal reproduction. Inspired by this, this study develops a hydroresponsive fiber array by integrating the hydrogel, whose configuration can be altered reversibly between the opening and closing state depending on the environmental humidity. This study believes the research can offer inspirations for designing and developing adaptive devices by using fibers array, as smart aerocraft.

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Section: Resultsmentioning

confidence: 99%

Hydroactuated Configuration Alteration of Fibrous Dandelion Pappi: Toward Self‐Controllable Transport Behavior

Meng

Wang

Zhao

et al. 2016

Adv Funct Materials

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“…It is noteworthy that all species of Eupatorieae studied have phytomelanin in cell walls of some layers in the pericarp (Marzinek & Oliveira ). Phytomelanin is a substance produced by mesocarp cells and is related to the protection of ovule and seeds of some tribes of Asteraceae (Pandey et al.…”

Section: Discussionmentioning

confidence: 99%

Seed ontogeny in Eupatorieae: development and functional aspects

Marzinek

Oliveira

2019

Feddes Repertorium

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Changes in the role of the seed coat during seed development have not been extensively examined, mainly because the greater emphasis is usually placed upon its function in the mature seed. Additionally, there have been few studies on the seeds of Asteraceae, and those that have been undertaken rarely addressed functional aspects of seeds. The present study examined seed ontogeny in species of Eupatorieae (Asteraceae) and investigated the role of the seed coat in seed nutrition and abortion. A new pattern of seed vasculature was encountered for the family, in addition to two other types previously described for other species. The most significant role of the seed coat among the species of Eupatorieae examined was in seed nutrition. The inner mesotesta is consumed during seed development, while the remaining layers collapse at maturity and cease to function. Seed abortion was observed in all of the species examined, varying from 95% in Symphyopappus reticulatus to 18.5% in Vittetia orbiculata. Changes in endothelial tissue were found in all episodes of abortion, although variation was observed concerning remnant structures and their degree of development. The young seed coat in Asteraceae has a nutritive role, while at maturation the pericarp serves a protective function.

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“…The ovarian mesophyll of the ten Asteraceae species is composed of two or three tissue regions. Most of the studies with Asteraceae fruit ontogeny describes two histological regions (Pandey and Singh 1980;Galastri and Oliveira 2010;Marzinek and Oliveira 2010;Pallone and Souza 2014) or three regions of tissues (Julio and Oliveira 2009;Pallone and Souza 2014). Compared with most eudicots, in which the ovary has a relatively simple structure, Asteraceae ovaries have a complex structure, probably due to the difficulty in distinguishing carpellary from receptacular and/or appendicular tissue.…”

Section: Discussionmentioning

confidence: 99%

Flower structure in ten Asteraceae species: considerations about the importance of morpho-anatomical features at species and tribal level

Batista

Souza

2016

Braz. J. Bot

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Flowers of Asteraceae have conspicuous features that are important at the tribal level, such as the branches of the style, pappus, shape of the corolla, and anthers. The floral ontogeny of ten Brazilian weed species of Asteraceae was performed for Conyza bonariensis L., Cosmos sulphureus Cav., Eclipta alba L., Elephantopus mollis Kunth, Emilia sonchifolia L. DC., Galinsoga quadriradiata Ruiz and Pav., Erechtites valerianifolius (Link ex Spreng) DC., Parthenium hysterophorus L. Praxelis clematidea R. M. King and H. Rob, and Sigesbeckia orientalis L. in order to describe the morpho-anatomy, ontogenetic steps, and identify features that may support the tribeal classification. Flowers and buds were fixed in glutaraldehyde, embedded in historesin, and sectioned with a rotary microtome. Sections were stained with Toluidine Blue. The inflorescence can be heterogamous or homogamous; the pappus is absent or persistent; the corolla is tubular or ligulate; anthers have an apical appendage which is obtuse or acute; and some anatomical features are the ovary usually trapezoidal-shaped; the pappus either vascularized or not; the corolla with possible secretory structures, only two species do not show twin hair on the outer ovary epidermis;and ovarian mesophyll usually composed of two or three regions. In general, the species analyzed show several similar features, such as the anther structure, pappus, and stigma. A distinct feature was observed among the species: the absence of pappus, and twin hairs in three species: E. alba (Heliantheae tribe), P. hysterophorus (Heliantheae tribe), and S. orientalis (Millerieae tribe), all belonging to ''Helliantheae Alliance'' clade.

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Structure and ontogeny of the pericarp of six Eupatorieae (Asteraceae) with ecological and taxonomic considerations

Cited by 31 publications

References 21 publications

Hydroactuated Configuration Alteration of Fibrous Dandelion Pappi: Toward Self‐Controllable Transport Behavior

Hydroactuated Configuration Alteration of Fibrous Dandelion Pappi: Toward Self‐Controllable Transport Behavior

Seed ontogeny in Eupatorieae: development and functional aspects

Flower structure in ten Asteraceae species: considerations about the importance of morpho-anatomical features at species and tribal level

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