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Journal articles on the topic 'Plantes – Ontogenèse'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 May 2024

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1

Charon, J., E. Vindt-Balguerie, and J. Launay. "Ontogenèse des canaux sécréteurs d'origine primaire dans la jeune plante de Pinus pinaster." Canadian Journal of Botany 68, no. 10 (1990): 2119–26. http://dx.doi.org/10.1139/b90-277.

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An ontogenic study of the primary resin ducts was carried out from the embryo to the 2-month-old seedlings stage in Pinus pinaster Ait. and revealed two separate systems, the hypocotyl-radicular ducts and the epicotylar ducts. In the first system, each one of the resin ducts, which are numerically equal to the protoxylem strands of the radicle, is formed by vertical juxtaposition of two canals initiated partly in the hypocotyl and in the radicle. This system is closed at the level of the cotyledonary node. The second system consists of the anastomosis of the resin ducts initiated in the base o

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2

Rabau, T., B. Longly, and B. P. Louant. "Ontogenèse des sacs embryonnaires non réduits chez Eragrostis curvula." Canadian Journal of Botany 64, no. 8 (1986): 1778–85. http://dx.doi.org/10.1139/b86-237.

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The apomictic reproductive mode by diplospory is cytologically analysed in Eragrostis curvula (Schrad.) Nees, a tetraploid forage grass. The genesis of unreduced embryo sacs is followed; two kinds of sacs are then distinguished: (i) a monopolar one with a typical oogonial complex and a polar nucleus at the micropylar end; (ii) a bipolar one with an egg cell and two polar nuclei at the micropylar end, and some antipodial cells at the chalazal end. Monopolar sacs are 3 times more frequent than bipolar ones. Traces of sexuality are noted in E. curvula but with a low frequency. A chronology of fem

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3

Charon, J., J. Launay, and E. Vindt-Balguerie. "Ontogenèse des canaux sécréteurs d'origine primaire dans le bourgeon de Pin maritime." Canadian Journal of Botany 64, no. 12 (1986): 2955–64. http://dx.doi.org/10.1139/b86-390.

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In the bud of Pinus pinaster Ait., two resin ducts are formed at the base of each very young scale on each side of the procambial strand. They differentiate in the acropetal and basipetal directions as do the vascular tissues. During the basipetal differentiation, the resin ducts from each scale anastomose in a definite way: the left resin duct of each scale is connected with the right duct of the n – 8 scale rank and the right duct, with the left duct of the n – 5 scale rank. The resin canal system of the shoot is then constituted of only 13 resin ducts. The resin ducts of the maritime pine a

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4

Wagner, Jean, and Marie-Agnès Letrouit-Galinou. "Structure et ontogenèse du thalle squamuleux du lichen Endocarpon pusillum (Pyrénolichens, Verrucariacées)." Canadian Journal of Botany 66, no. 11 (1988): 2118–27. http://dx.doi.org/10.1139/b88-290.

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Observations concerning morphology, structure, and ontogeny of the thallus of a squamulous species, Endocarpon pusillum Hedw., are presented. The latter is composed of squamules, most of which are interconnected by a well developed network of rhizomorphs. Four types of squamules have been distinguished according to their morphological characters and their location with regard to rhizomorphs. The squamules of E. pusillum are characterized by the lack of lacunae and the presence of numerous rhizomorphic-like hyphae in the medulla, which are in topographical relation with the hyphae of the rhizom

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5

Gaillard, J., and M. Th L'Hardy-Halos. "Morphogenèse du Dictyota dichotoma (Dictyotales, Phaeophyta). III. Ontogenèse et croissance des frondes adventives." Phycologia 29, no. 1 (1990): 39–53. http://dx.doi.org/10.2216/i0031-8884-29-1-39.1.

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6

Kötting, K., and W. Höfner. "Die Ontogenese von Zea mays L. und ihre Beeinflußbarkeit durch Wachstumsregulatoren." Journal of Agronomy and Crop Science 161, no. 4 (1988): 221–33. http://dx.doi.org/10.1111/j.1439-037x.1988.tb00661.x.

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7

Wiehe, W., and S. W. Breckle. "Die Ontogenese der Salzdrüsen vonLimonium(Plumbaginaceae); The Ontogenesis of the Salt Glands ofLimonium(Plumbaginaceae)." Botanica Acta 103, no. 1 (1990): 107–10. http://dx.doi.org/10.1111/j.1438-8677.1990.tb00135.x.

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8

Maiellaro, M., and F. Macchia. "Germinazione ed Ontogenesi Della Plantula diLeopoldia Comosa(L.) Parl." Giornale botanico italiano 130, no. 1 (1996): 497. http://dx.doi.org/10.1080/11263509609439714.

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9

Gaillard, J., M. Th L'Hardy-Halos, and L. Pellegrini. "Morphogenèse du Dictyota dichotoma (Huds.) Lamouroux (Phaeophyta). II. Ontogenèse du thalle et cytologie ultrastructurale des différents types de cellules." Phycologia 25, no. 3 (1986): 340–57. http://dx.doi.org/10.2216/i0031-8884-25-3-340.1.

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10

Tucker, Shirley C. "The role of floral development in studies of legume evolution." Canadian Journal of Botany 70, no. 4 (1992): 692–700. http://dx.doi.org/10.1139/b92-089.

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Comparative floral development is useful to test hypotheses of phylogeny and taxonomic relationships among legumes because it provides a greater understanding of character states. It can reveal homologies, as in the cupule, an anomalous and varied structure among species of Psoralea that originates by fusion of two or more small bracts. Convergence is demonstrated by comparing differing developmental pathways of specialized floral features such as dorsiventral heterostameny, eccentric corolla, porate stamens, and enantiostyly, among species of Cassia, Senna, and Chamaecrista. Naturally occurri

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11

Ren, Jia-Bin, and Yan-Ping Guo. "Behind the diversity: Ontogenies of radiate, disciform, and discoid capitula of Chrysanthemum and its allies." Journal of Systematics and Evolution 53, no. 6 (2015): 520–28. http://dx.doi.org/10.1111/jse.12154.

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12

Dengler, Nancy G. "Patterns of leaf development in anisophyllous shoots." Canadian Journal of Botany 70, no. 4 (1992): 676–91. http://dx.doi.org/10.1139/b92-088.

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Comparisons of the development of the dimorphic leaves of anisophyllous shoots can be used to understand how ontogenies might be modified during evolution to produce morphological change. In anisophyllous shoots, leaves of different sizes are borne on the dorsal and ventral sides of plagiotropic stems. Anisophylly is regarded as an adaptation for light interception in strongly shaded habitats since the small size of dorsal leaves and orientation of leaf blades minimizes self-shading. Anisophylly affects not only the patterns of leaf development, but also shoot symmetry, phyllotaxis, and bud de

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13

Cunha Neto, Israel L. "Vascular variants in seed plants – a developmental perspective." AoB PLANTS, July 12, 2023. http://dx.doi.org/10.1093/aobpla/plad036.

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Abstract Over centuries of plant morphological research, biologists have enthusiastically explored how distinct vascular arrangements have diversified. These investigations have focused on the evolution of steles and secondary growth and examined the diversity of vascular tissues (xylem and phloem), including atypical developmental pathways generated through modifications to the typical development of ancestral ontogenies. A shared vernacular has evolved for communicating on the diversity of alternative ontogenies in seed plants. Botanists have traditionally used the term “anomalous secondary

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14

Cunha Neto, Israel L., Yanã C. Rizzieri, Pablo A. Cabanillas, et al. "Molecular phylogeny of Urvillea (Paullinieae, Sapindaceae) and its implications in stem vascular diversity." Annals of Botany, July 10, 2023. http://dx.doi.org/10.1093/aob/mcad093.

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Abstract Background and Aims The tribe Paullinieae have the highest diversity of vascular variants among the seed plants. The developmental diversity is better understood in the species rich genera Paullinia and Serjania, however, the phylogeny and diversity of vascular variants in the smaller genera of Paullinieae remain understudied. Here we investigate the evolution of development of stem vasculatures in the small genus Urvillea. Methods We generate the first molecular phylogeny of Urvillea derived from 11 markers using a maximum likelihood and Bayesian approach. In combination with phyloge

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15

Petrone-Mendoza, Emilio, Mariana Benítez, María E. Lárraga, and Mark E. Olson. "The evolution of ontogenetic “decision-making” in the wood of a clade of tropical plants." Evolution, December 27, 2023. http://dx.doi.org/10.1093/evolut/qpad232.

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Abstract Greater diversity in functional morphology should be associated with the evolution of greater ontogenetic diversity, an expectation difficult to test in most long-lived wild organisms. In the cells derived from the wood meristem (vascular cambium), plants provide extraordinary systems for reconstructing ontogenies in often long-lived organisms. The vascular cambium produces files of cells from the stem center to the periphery, with each cambial derivative “deciding” which of four cell types it differentiates into. Wood cell files remain in place, allowing tracing of the ontogenetic “d

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