The Grass Flower: Suggestions on its Origin and Evolution

Cocucci, Alfredo E.; Antón, Ana M.

doi:10.1016/s0367-2530(17)30374-2

Cited by 30 publications

(42 citation statements)

References 8 publications

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“…These results do not, however, necessarily imply that the lodicule is historically homologous to the higher eudicot petal (Ambrose et al 2000;Ma 2000) or even to the petals of more primitive monocots. The data currently on hand could also be consistent with the theory that lodicules represent sterilized stamens (Clifford 1987;Cocucci and Anton 1988), which could conceivably express B group genes, reflecting their staminal derivation, but not C group genes (as a result of their S38 INTERNATIONAL JOURNAL OF PLANT SCIENCES sterilization). We must also consider the inherent danger of comparing highly divergent model species in the absence of substantial data from intervening taxa (Bolker 1995;Bang et al 2000) The ranunculids, which represent the basalmost eudicots, would seem to have relatively stable floral morphology compared with the magnoliids.…”

Section: Our Survey Of the B Class Genes Outside The Higher Eudicots supporting

confidence: 78%

Evolution of the Petal and Stamen Developmental Programs: Evidence from Comparative Studies of the Lower Eudicots and Basal Angiosperms

Kramer

Irish

2000

International Journal of Plant Sciences

162

138

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Section: Our Survey Of the B Class Genes Outside The Higher Eudicots supporting

confidence: 78%

Evolution of the Petal and Stamen Developmental Programs: Evidence from Comparative Studies of the Lower Eudicots and Basal Angiosperms

Kramer

Irish

2000

International Journal of Plant Sciences

162

138

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“…A functional explanation for this is the pressure of the bract in early stages of development, compressing the abaxial side of the flower and retarding the initiation of organs on that side. This fits also the interpretation of Cocucci and Anton (1988) for the existence of only two lodicules and three stamens in the grass flower.…”

Section: Discussionsupporting

confidence: 90%

Floral Ontogenetic Evidence in Support of the Willdenowia Clade of South African Restionaceae

2001

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The floral development of a number of representative genera of the Willdenowia clade of Restionaceae was studied to understand patterns of reduction of floral elements and sample evidence for discussing the relationships of the group. All species studied are characterized by a concordant reductive trend involving the retardation/reduction of the perianth, the loss of the anterior carpel and the displacement of the remaining carpels, linked with a strongly compressed spikelet. Different modes of carpel reduction, such as a progressive or immediate loss, or fusion of two neighboring carpels, are presented and discussed. The most parsimonious event of gynoecium evolution for the Willdenowia clade is either the sterilization of two carpels in an originally trimerous gynoecium, followed by the loss of the anterior carpel, or the sudden loss of the anterior carpel, preceeding the sterilization of one lateral carpel. The concordant development of the taxa of the Wi//denowia clade supports a one-time loss of a carpel and the homogeneity of the clade.

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“…The number of stamens described for Poaceae varies between one and nine, with the most frequent pattern being three to six stamens (Longhi-Wagner, 2001), which are arranged in one or two whorls (Cocucci and Anton, 1988). Most species present three stamens.…”

Section: Discussionmentioning

confidence: 99%

Anther and pollen development in some species of Poaceae (Poales)

2010

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Anther and pollen development were studied in Olyra humilis Nees, Sucrea monophylla Soderstr, (Bambusoideae), Axonopus aureus P. Beauv., Paspalum polyphyllum Nees ex Trin. (Panicoideae), Eragrostis solida Nees, and Chloris elata Desv. (Chloridoideae). The objective of this study was to characterise, embryologically, these species of subfamilies which are considered basal, intermediate and derivate, respectively. The species are similar to each other and to other Poaceae. They present the following characters: tetrasporangiate anthers; monocotyledonous-type anther wall development, endothecium showing annular thickenings, secretory tapetum; successive microsporogenesis; isobilateral tetrads; spheroidal, tricellular, monoporate pollen grains with annulus and operculum. Nevertheless, the exine patterns of the species studied are distinct. Olyra humilis and Sucrea monophylla (Bambusoideae) show a granulose pattern, whereas in the other species, it is insular. In addition, Axonopus aureus and Paspalum polyphyllum (Panicoideae) have a compactly insular spinule pattern, while Chloris elata and Eragrostis solida (Chloridoideae) show a sparsely insular spinule pattern. The exine ornamentation may be considered an important feature at the infrafamiliar level.Keywords: Bambusoideae, Chloridoideae, Gramineae, microsporogenesis, Panicoideae. Desenvolvimento da antera e do grão de pólen em espécies de Poaceae (Poales)Resumo O desenvolvimento da antera e do grão de pólen de Olyra humilis Nees, Sucrea monophylla Soderstr. (Bambusoideae), Axonopus aureus P. Beauv., Paspalum polyphyllum Nees ex Trin. (Panicoideae), Eragrostis solida Nees and Chloris elata Desv. (Chloridoideae) foi estudado visando caracterizar embriologicamente essas espécies de subfamílias consideradas basal, intermediária e derivada, respectivamente. As espécies são similares entre si e entre as demais Poaceae. Apresentam os seguintes caracteres: anteras tetrasporangiadas; desenvolvimento da parede da antera do tipo monocotiledôneo, endotécio com espessamento de parede anelar, tapete secretor; microsporogênese sucessiva; tétrades isobilaterais; grãos de pólen esféricos, tricelulares, monoporados, com anel e opérculo. Por outro lado, o padrão de ornamentação da exina do grão de pólen é distinto. Olyra humilis e Sucrea monophylla (Bambusoideae) apresentam padrão granuloso e as demais espécies padrão insular. Axonopus aureus e Paspalum polyphyllum (Panicoideae) apresentam espínulos densamente agrupados, enquanto Chloris elata e Eragrostis solida (Chloridoideae) espínulos esparsamente agrupados. A ornamentação da exina dos grãos de pólen pode ser considerada caráter importante a nível infrafamiliar.

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The Grass Flower: Suggestions on its Origin and Evolution

Cited by 30 publications

References 8 publications

Evolution of the Petal and Stamen Developmental Programs: Evidence from Comparative Studies of the Lower Eudicots and Basal Angiosperms

Evolution of the Petal and Stamen Developmental Programs: Evidence from Comparative Studies of the Lower Eudicots and Basal Angiosperms

Floral Ontogenetic Evidence in Support of the Willdenowia Clade of South African Restionaceae

Anther and pollen development in some species of Poaceae (Poales)

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