II. Exine development in Passiflora racemosa Brot.: post-tetrad period. Overlooked aspects of development

Gabarayeva, Nina I.; Grigorjeva, Valentina V.; Kosenko, Yana

doi:10.1007/s00606-013-0756-3

Cited by 13 publications

(4 citation statements)

References 24 publications

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“…The more species from different plant groups we study for sporoderm development, the more evidence we accumulate for the idea that the sequence of sporoderm developmental events represents, in essence, the sequence of self-assembling micellar mesophases, initiated by genomically given physicochemical parameters and induced by surfactant glycoproteins of the glycocalyx at increasing concentrations (Gabarayeva, 2000: basal angiosperms;Gabarayeva et al, 2009aGabarayeva et al, , 2009bGabarayeva et al, , 2010aGabarayeva et al, , 2010bGabarayeva et al, , 2011aGabarayeva et al, , 2011bGabarayeva et al, , 2013aGabarayeva et al, , 2013b: Trevesia burckii Boerl., Persea americana Mill., Acer tataricum L., Alsophila setosa Kaulf., Symphytum officinale L., Passiflora racemosa Brot. ; Moore et al, 2009: Osmunda regalis L.; Blackmore et al, 2010: Compositae;Gabarayeva & Grigorjeva, 2010: Chamaedorea microspadix Burret, Swida alba (L.) Opiz in Bercht.…”

Section: Modelling Of Exine 243mentioning

confidence: 99%

Experimental modelling of exine-like structures

Gabarayeva

Grigorjeva

2013

Grana

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Section: Modelling Of Exine 243mentioning

confidence: 99%

Experimental modelling of exine-like structures

Gabarayeva

Grigorjeva

2013

Grana

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“…Mohl (1834) and Fritzsche (1837) were the first researchers to use the pollen morphology of Passiflora species for taxonomic purposes, highlighting the shape and ornamentation as good taxonomic characteristics. Based on these studies, some other research have focused on palynology in the differentiation of Passiflora and/or species (Amela Garcia et al 2002, Milward-de-Azevedo et al 2010, 2014a, Gabarayeva et al 2013, Mezzonato-Pires et al 2015a. However, few studies simultaneously analyzed different subgenera of the Passifloraceae (Mezzonato-Pires et al 2015b).…”

Section: Introductionmentioning

confidence: 99%

Comparative pollen morphological analysis in the subgenera Passiflora and Decaloba

Soares

Jesus

Souza

et al. 2018

An. Acad. Bras. Ciênc.

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The genus Passiflora is the most diversified of the Passifloraceae, and its palynology presents wide morphological variability. The objective of the study was to evaluate the pollen morphology of 18 Passiflora species in order to identify informative pollinic characteristics to contribute to the taxonomic classification of the genus. The morphology of the pollen grains and the exine structure were investigated using light microscopy and scanning electron microscopy. Differences in the pollen morphology were found in the studied species, mainly in terms of shape, pollen aperture and ornamentation pattern of the exine. Most of the species belonging to the subgenus Passiflora presented ornamented 6-syncolpate pollen grains with an oblate-spheroidal shape and an exine with large lumens. In the subgenus Decaloba the pollen grains were 6-colporate, 12-colpate and 12-colporate, with subprolate to prolate-spheroidal shape, as well as an exine with smaller lumen size and few ornamented. The pollen morphology of the species of the subgenera Passiflora and Decaloba has shown palynological characteristics that have specific diagnostic value, thus allowing a better understanding of the taxonomy of the genus Passiflora.

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“…The reiteration of the other physical process (self‐assembly) is also typical. For instance, micellar mesophases, observed earlier in Passiflora (and other species) (Gabarayeva et al , 2013a,b), occur twice in exine development. In general, self‐assembling mechanisms and their nonlinear nature presuppose the effect of reiteration of similar patterns in many spore and pollen taxa – the manifestation of homoplasy.…”

Section: Discussionmentioning

confidence: 92%

“…We think that self‐assembly and phase separation work ‘hand in hand’. It is clear that this phenomenon is especially demonstrated in species with ‘two‐storied’ exines, such as Passiflora (Gabarayeva et al , 2013a,b; Radja et al , ), Tanacetum (Gabarayeva et al , ), and Echinops (Gabarayeva et al , ). Reconsideration of the developmental events in, for example, Echinops exaltatus shows that phase separation comes into force first at the early tetrad stage, resulting in the establishment of a thick, elaborated glycocalyx up to the mid‐tetrad stage, and then the second wave of phase separation results in the appearance of typical gaps at the transition of the mid‐tetrad stage to the late tetrad stage.…”

Section: Discussionmentioning

confidence: 99%

Artificial pollen walls simulated by the tandem processes of phase separation and self‐assemblyin vitro

2019

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Despite numerous attempts to elucidate the developmental mechanisms responsible for the observed diversity of pollen and spore walls, the processes involved remained obscure until the structures observed during exine development were recognized as a sequence of selfassembling micellar mesophases. To confirm this, a series of in vitro experiments was undertaken in which exine-like patterns were generated in colloidal mixtures by self-assembly, without any genomic participation. The intention was to test whether all the main types of exine structure could be simulated experimentally.Mixtures of substances, analogous to those involved in microspore development, were left undisturbed while water evaporated and self-assembly occurred. We varied the substances, their combinations and concentrations, and the physical constraints to make the experiments closer to the situation in nature. The resulting dry films were then examined using transmission electron microscopy.A variety of microstructures, simulating the full range of exine types, was obtained by micellar self-assembly. Moreover, the signs of related physicochemical process (i.e. phase separation) were also observed.Simple, energy-efficient, physical-chemical interactions, phase separation and self-assembly, are capable of generating exine-like patterns, providing evidence that these processes share control of exine formation with the well-documented program of gene expression.

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II. Exine development in Passiflora racemosa Brot.: post-tetrad period. Overlooked aspects of development

Cited by 13 publications

References 24 publications

Experimental modelling of exine-like structures

Experimental modelling of exine-like structures

Comparative pollen morphological analysis in the subgenera Passiflora and Decaloba

Artificial pollen walls simulated by the tandem processes of phase separation and self‐assemblyin vitro

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