Ontogeny of pollen grains in<i>Zingiber spectabile</i>(Zingiberaceae)

Theilade, Ida; Theilade, J.

doi:10.1080/00173139609429077

Cited by 17 publications

(3 citation statements)

References 22 publications

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“…The images ( Figure 10B-D) are very similar to those of the channelled zone of species with a thin, rudimentary exine and thick intine [as e.g. in Heliconia and Canna (Stone et al, 1979;Kress & Stone, 1982;Skvarla & Rowley, 1986), Strelizia (Hesse & Waha, 1983), and Zingiber (Theilade & Theilade, 1996)]. Interestingly, the images of the channelled intine of Chamaedorea are similar to the images of cylindrical alveolae of ectexine in the cycads Stangeria and Encephalartos (Gabarayeva & Grigorjeva, 2002, 2004.…”

Section: Exine Maturation and Intine Appearance In The Posttetrad Periodsupporting

confidence: 53%

Sporoderm ontogeny inChamaedorea microspadix(Arecaceae): self-assembly as the underlying cause of development

Gabarayeva

Grigorjeva

2010

Grana

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The developmental events in the periplasmic space and cytoplasm of microspores of Chamaedorea microspadix during sporoderm ontogeny have been traced in detail from cytokinesis and early tetrad stage to the formation of intine in mature two-celled pollen grains. Several pre-pattern structures as seen in the periplasmic space of early microspores (dark-contrasted globules, ribbon-like striped structures, strings of beads, spherical units, radially oriented columns of spherical units, rod-like units), can easily be read as different types of micelles (spherical, cylindrical micelles, so-called segmented worms) and their intermediate forms (strings, perforated filaments, columns of spherical micelles). Funnel-like procolumellae, arranged as complexes of bent units, appear next at the middle tetrad stage. These "funnels" possibly correspond to double gyroid phase, typical for a diblock copolymer system, adapted to constraints of the narrow periplasmic space. The foot layer and few endexine lamellae with central white lines appear as laminate ("neat") micelles, with typical gaps between the laminae; they emerge through intermediate forms of micelles as strings of spherical micelles and/or perforated laminae. Strings are probably a preferential intermediate form of micelle formation in the course of exine development in Chamaedorea: they emerge at every ontogenetic step and participate in the appearance of every exine layer. The first (channelled) layer of the two-layered intine beneath the aperture appears probably on the base of cylindrical micelles. The sequence of the sporoderm layer formation can be understood as a sequence of self-assembling mesophases (and their intermediate forms) in the colloidal system of the microspore periplasmic space, unfolding through the ontogenetic time.

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Section: Exine Maturation and Intine Appearance In The Posttetrad Periodsupporting

confidence: 53%

Sporoderm ontogeny inChamaedorea microspadix(Arecaceae): self-assembly as the underlying cause of development

Gabarayeva

Grigorjeva

2010

Grana

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“…The two intine layers observed in Dioscoreales in our study correspond to the middle intine layer and the endintine of Suá rez-Cervera et al (2000), and the pectic exintine layer on top of the channeled intine is absent. The same two layers were also found in Canna (Rowley and Skvarla 1986) and Zingiber (Theilade and Theilade 1996), which also lack exintine. Possible roles of the thick, channeled intine include prevention of gametophyte desiccation during pollination, release of enzymes related to pollen tube growth, and control of the enlargement of the apertural region (Suá rez-Cervera et al 2000).…”

Section: Intine Ontogeny and Ultrastructuresupporting

confidence: 48%

Comparative Pollen Development in Dioscoreales

Schols¹,

Furness

Merckx

et al. 2005

International Journal of Plant Sciences

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Pollen and orbicule ontogeny in representatives of three genera of Dioscoreales-Narthecium ossifragum Huds. (Nartheciaceae), Tacca artocarpifolia Seem. and Tacca chantrieri André (Dioscoreaceae), and Dioscorea communis (L.) Caddick & Wilkin (Dioscoreaceae)-is described and illustrated using LM, SEM, and TEM. The main difference is in microsporogenesis, which is successive in Narthecium Huds. and simultaneous in Tacca J.R. & G. Forst. and Dioscorea L. This is reflected in the tetrad configuration but not in the apertures: Narthecium and Tacca are monosulcate, while Dioscorea has two equatorial apertures. Other features of pollen development are similar in all three genera. Exine development starts at the proximal pole, and during the tetrad stage, the exine remains thicker at this pole. Intine development begins before mitosis. A conspicuously channeled intine forms beneath the aperture(s) in all three genera, and in Tacca it also occurs in nonapertural regions. After mitosis, the generative cell is situated at the proximal pole in all genera. Orbicules are present in Narthecium and Dioscorea but not in Tacca, although it has a secretory tapetum. In the tetrad stage, pro-orbicules appear on the tapetum in Narthecium and Dioscorea, and pro-sporopollenin is consequently deposited to form the orbicule wall.

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“…5 H, I) Inaperturate, (1-2 sulcate) (Sharma, 1967 ;Liang, 1988 ;Furness and Rudall, 1999 a, b) Zingiber Successive (Theilade and Theilade, 1996) Inaperturate (Liang, 1988 ;Theilade et al, 1993 ;Theilade and Theilade, 1996) Poales : Abolbodaceae Abolboda…”

Section: Pontederiamentioning

confidence: 99%

Microsporogenesis in Monocotyledons

1999

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This paper critically reviews the distribution of microsporogenesis types in relation to recent concepts in monocot systematics. Two basic types of microsporogenesis are generally recognized : successive and simultaneous, although intermediates occur. These are characterized by differences in tetrad morphology, generally tetragonal or tetrahedral, although other forms occur, particularly associated with successive division. Successive microsporogenesis is predominant in monocotyledons, although the simultaneous type characterizes the ' lower ' Asparagales. Simultaneous microsporogenesis also occurs in Japonolirion and Petrosa ia (unplaced taxa), some Araceae, Aponogeton, Thalassia and Tofieldia (Alismatales), Dioscorea, Stenomeris and Tacca (Dioscoreales), and some Commelinanae : Arecaceae (Arecales), and Cyperaceae, Juncaceae and Thurniaceae (Poales). Simultaneous microsporogenesis is of phylogenetic significance within some of these groups, for example, Asparagales, Dioscoreales and Poales. An intermediate type is recorded in Stemonaceae (Pandanales), Commelinaceae (Commelinales) and in Eriocaulaceae and Flagellariaceae (Poales). There is little direct relationship between microsporogenesis type and pollen aperture type in monocots (except for trichotomosulcate and pantoporate apertures), although trichotomosulcate apertures in monocot pollen, and equatorial tricolpate and tricolporate apertures in eudicot pollen, are all related to simultaneous microsporogenesis.# 1999 Annals of Botany Company Huynh K-L. 1976. Arrangement of some monosulcate, disulcate, trisulcate, dicolpate, and tricolpate pollen types in the tetrads, and some aspects of evolution in the angiosperms. In : Ferguson IK, Muller J, eds. The e olutionary significance of the exine. London : Academic Press, 101-124. Huynh K-L. 1980. La morphologie du pollen de Pandanus subg. Vinsonia (Pandanaceae) et sa signification taxonomique. Pollen et Spores 22 : 173-189. Huynh K-L, Stone BE. 1981. On a new subsection of Pandanus section Cauliflora (Pandanaceae) with paniculate staminate inflorescence structure, distinctive leaf anatomy and pollen morphology.

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Ontogeny of pollen grains inZingiber spectabile(Zingiberaceae)

Cited by 17 publications

References 22 publications

Sporoderm ontogeny inChamaedorea microspadix(Arecaceae): self-assembly as the underlying cause of development

Sporoderm ontogeny inChamaedorea microspadix(Arecaceae): self-assembly as the underlying cause of development

Comparative Pollen Development in Dioscoreales

Microsporogenesis in Monocotyledons

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