Recherches sur la ramification chez les Asclépiadacées

Bugnon, François

doi:10.1080/00378941.1955.10833297

Cited by 8 publications

(6 citation statements)

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“…As they develop from the same meristematic structures, tendrils and inflorescences have been proposed to be homologous organs. Furthermore, inflorescences and tendrils can substitute for each other depending on environmental conditions or hormonal treatments, and occasionally tendrils can give rise to flowers and fruits (Darwin, 1875;Bugnon, 1953;Pratt, 1971Pratt, , 1974Srinivasan and Mullins, 1981;Thomas, 2000, 2002). The presence of lateral meristems that give rise to tendrils, inflorescences, or intermediate organs and the production by the SAM of both leaves and lateral meristems that become opposed at maturity are a special feature of the Vitaceae.…”

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Floral Meristem Identity Genes Are Expressed during Tendril Development in Grapevine

et al. 2004

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To study the early steps of flower initiation and development in grapevine (Vitis vinifera), we have isolated two MADS-box genes, VFUL-L and VAP1, the putative FUL-like and AP1 grapevine orthologs, and analyzed their expression patterns during vegetative and reproductive development. Both genes are expressed in lateral meristems that, in grapevine, can give rise to either inflorescences or tendrils. They are also coexpressed in inflorescence and flower meristems. During flower development, VFUL-L transcripts are restricted to the central part of young flower meristems and, later, to the prospective carpel-forming region, which is consistent with a role of this gene in floral transition and carpel and fruit development. Expression pattern of VAP1 suggests that it may play a role in flowering transition and flower development. However, its lack of expression in sepal primordia, does not support its role as an A-function gene in grapevine. Neither VFUL-L nor VAP1 expression was detected in vegetative organs such as leaves or roots. In contrast, they are expressed throughout tendril development. Transcription of both genes in tendrils of very young plants that have not undergone flowering transition indicates that this expression is independent of the flowering process. These unique expression patterns of genes typically involved in reproductive development have implications on our understanding of flower induction and initiation in grapevine, on the origin of grapevine tendrils and on the functional roles of AP1-and FUL-like genes in plant development. These results also provide molecular support to the hypothesis that Vitis tendrils are modified reproductive organs adapted to climb.

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Floral Meristem Identity Genes Are Expressed during Tendril Development in Grapevine

et al. 2004

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“…Arber (1938) reports that the 13 th century scholar, St Albertus Magnus of Cologne, stated in one of his treatments of Aristotle's works that "the tendril is to be interpreted as a bunch of grapes incompletely developed". Thus, the close morphological relationship between these two structures has been recognized for centuries in Vitis (Bugnon, 1953). Comparative morphological studies on other members of the family were not undertaken until the mid-20 th century, largely because of the lack of modern ontogenetic, physiological, and molecular techniques.…”

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confidence: 99%

Inflorescence morphology and development in the basal rosid lineage Vitales

Gerrath

Posluszny

Ickert‐Bond

et al. 2017

J of Sytematics Evolution

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This review summarizes inflorescence developmental morphology in the grape order Vitales within a phylogenetic context. Inflorescences in the shrubby Leeaceae are terminal thyrses that appear leaf-opposed once renewal growth begins. Plants of the Vitaceae are mainly tendrilled lianas and form five well-defined clades. Inflorescences develop from the unique, non-leafy, uncommitted primordium which arises opposite a leaf on the flank of the shoot apical meristem, and may mature into an inflorescence, tendril, or a combination of the two. The Ampelopsis-Rhoicissus clade, Cissus antarctica group and Yua have a tendril/inflorescence, with cymose branching on the inflorescence axis. Inflorescences in the core Cissus clade and Cyphostemma-Tetrastigma clade arise on a compressed axillary shoot, and leaf-opposed tendrils arise on the main shoot, resulting in different branch orders. In Parthenocissus, tendrils are leaf-opposed on long shoots, and inflorescences are leaf-opposed on axillary branches on short shoots. In the Ampelocissus-Vitis clade, the leaf-opposed tendrils and thyrse inflorescences are of the same branching order, and are often combined. Terminal inflorescences such as in Leeaceae are common in angiosperms, in contrast to the unique leaf-opposed tendril/inflorescence of Vitaceae. The further separation of the tendrils and inflorescences onto different orders of branching (core Cissus, Cyphostemma-Tetrastigma), or separate short and long shoots (Parthenocissus), have allowed each component to optimize its own function. The Ampelocissus-Vitis clade, however, has returned to a thyrse inflorescence, which may allow for larger or unusual lamellate inflorescences (Pterisanthes), and has reunited tendrils and inflorescences. Thus, each clade has developed its own set of inflorescence morphology.

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“…Moens (1956) and Millington (1966) have failed to explain morphogenetically how the first branch of the tendril is extraaxillary in origin and its subsequent branches axillary with displacement to extra-axillary positions. The morphological homology between the tendril and the inflorescence is now well known in the Vitaceae (Bugnon, 1953;Shah, 1956;Millington, 1966). The morphogenetic behavior of the mixed bud reported in Cayratia carnosa (Shah, 1960) has a bearing on the morphology of the tendril.…”

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confidence: 96%

“…He suggested that the tendril represents a branch of the aborted prophyll of the bud, which rotates around the vine-shoot through 1800 to occupy a position opposite the leaf. Bugnon (1953) proposed a new theory: that the first bract or scale of the tendril has the same value as a vegetative leaf borne by the axis.…”

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confidence: 99%