Studies on the Ontogeny of the Dwarf Mistletoes, Arceuthobium. I. Embryogeny and Histogenesis

Cohen, Leon I.

doi:10.2307/2440157

Cited by 6 publications

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“…The cotyledons in this instance, however, are only rudimentary, and the shoot apex only slightly developed (Cohen 1963). Shoots arise adventitiously from the endophytic system and may not emerge until two or more years after initial infection (Hawksworth and Wiens 1972 Cannon (1904) and Bray (1910) give only scanty details con- Recognition of the cotyledons is one of the primary means to interpret shoot morphology (Eames 1961).…”

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confidence: 91%

Morphological aspects of seedling establishment in four temperate region Phorandendron spp.

Ruhland¹

2000

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~ Four species of Phoradendron were examined for seedling morphology:P. bolleanum subsp. densum (on Junius), ~· californicum (on Prosopis), ~· juniperinum subsp. juniperinum (on Junip erus , ~· villosum subsp. Cotyledons of all species in the study were found to be persistent and possess a distinctive tip probably resulting from the site of attachment to the endosperm. These distinctive, persistent cotyledons and other clearly identified morphological features, allow to readily distinguish between plumular and adventitious shoots.

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confidence: 91%

Morphological aspects of seedling establishment in four temperate region Phorandendron spp.

Ruhland¹

2000

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“…Malheureusement il n'existe pas d'Ctudes de l'embryogenkse progressive suffisamment complktes pour permettre d'ttablir des schCmas interprktatifs indiscutables. L'exemple des Arceuthobiutn (Cohen 1963;Tainter 1968;Bhandari et Kanan Nanda 1968) illustre bien cette difficultk. A la difference du cas de 1'Arceuthobium tnitzutissimum, ou le p61e apical Clabore deux cotylCdons et un territoire prkcaulinaire axial ( fig.…”

Section: Application a Divers Groupes De Spermaphytesunclassified

“…35 et 36) ou des Cuscutn(Haccius et Troll 1961) est trks semblable B celle du p61e basal des Arceuthobiutn et relkve de l'une ou l'autre des deux inter~rktations. D'autres solutions proposCes par les auteurs sont inutiles ou non compatibles avec notre point de vue : veritable racine(Cohen 1963), organe sui generis(SallC 1975), hypocotyle (Guttenberg 1968), tige primordiale(Jacques-FClix 1982).…”

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Interprétation morphologique de l'embryon chez les Embryophytes, avec application au cas des Graminées (Poaceae)

Vallade¹,

Bugnon²,

Ibannain³

1993

Can. J. Bot.

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R e p le 6 janvier 1992 VALLADE, J., BUGNON, F., et IBANNAIN, Z. 1993. Interpretation morphologique de l'embryon chez les Embryophytes, avec application au cas des GraminCes (Poaceae). Can. J. Bot. 71 : 256 -272. Une tentative nouvelle d'interpretation de l'embryon des MonocotylCdones est effectuee a partir d'un reexamen des transformations fondamentales caracterisant l'evolution du zygote en individu, dans l'ensemble des ArchCgoniates ou Embryophytes, donc y compris les Bryophytes. Les processus Clementaires de toute embryogenbse sont analyses : segmentation, differenciation territoriale, diffkrenciation histogbne et differenciation organique, cette dernibre Ctant like a l'apparition de mCristbmes terminaux. La comparaison entre embryons appartenant des groupes systematiques trks diffLrents,est faite au moyen d'une representation schCmatisCe du corps au moment ou les ClCments essentiels se mettent en place. A partir des divers ClCments ainsi rassemblCs, un schema d'organisation est proposC pour l'embryon des Grarninees. Celui-ci comprend, entre autres, (i) un territoire pied (scutellum), homologue de celui des Ruppia et de divers ptCridophytes; la differenciation en pied affecte aussi une partie du cotyledon naissant; (ii) un cotyledon avec gaine coltoptilaire; (iii) un meristbme caulinaire primaire, lateral; (iv) une racine primaire, endogbne parce que la differenciation organique n'atteint pas la surface du corps;(v) une colCorhize, reliquat thallin de la periode proembryonnaire; l'espace qui la separe de la racine resulte de la delamination d'une des cloisons principales du proembryon.Mots clPs : embryogenbse, differenciation de l'embryon, Embryophytes, MonocotylCdones, GraminCes.VALLADE, J., BUGNON, F., and IBANNAIN, Z. 1993. Interpretation morphologique de l'embryon chez les Embryophytes, avec application au cas des GraminCes (Poaceae). Can. J. Bot. 71: 256-272. A new interpretation of the Monocotyledoneae embryo is presented following a reinvestigation of the fundamental transformations characterizing the evolution of the zygote to a plantlet, in the Archegoniatae division or Embryophyta subkingdom (including Bryophyta). The following elementary processes of embryogenesis were analysed: segmentation, territorial differentiation, histogen differentiation, and organic differentiation, the latter being related to the formation of terminal meristems. Embryos belonging to very different systematic groups are compared by a diagram showing the development of the essential parts of the embryo body. From the different data collected, a diagram is proposed to represent the embryo of the Gramineae. This includes (i) a foot area (scutellum) homologous to that of Ruppia and those of various Pteridophyta; the foot differentiation also affects a part of the rising cotyledon; (ii) a cotyledon with a coleoptilary sheath; (iii) a lateral primary caulinar meristem (shoot apex); (iv) a primary root (radicle), which is endogenous because the organic differentiation do not reach the outside of the body; (v) a coleorhiza, thalli...

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“…THE ORIGIN and organization of the main tissue systems in the embryo of Arceuthobium were described in the first paper of this series (Cohen, 1963). After germination, the seedling grows on the host surface unitil the root apex is confronted by a spur shoot or by a fragment of raised bark.…”

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confidence: 99%

“…THE SEEDLING-The radicular promeristem of the embryo with its compactly a-ranged cells consists of 4 zones: (1) a unicellular layer of surface initials; (2) a subapical zone of central initials; (3) a peripheral zone; and (4) a zone of procambial initials (Cohen, 1963). Each zone can be identified by a characteristic pattern of cell divisions; all cells derived from the radicle are interpreted to constitute the root of the seedling.…”

mentioning

confidence: 99%

Studies on the Ontogeny of the Dwarf Mistletoes, Arceuthobium. I. Embryogeny and Histogenesis

Cited by 6 publications

References 0 publications

Morphological aspects of seedling establishment in four temperate region Phorandendron spp.

Morphological aspects of seedling establishment in four temperate region Phorandendron spp.

Interprétation morphologique de l'embryon chez les Embryophytes, avec application au cas des Graminées (Poaceae)

Studies on the Ontogeny of the Dwarf Mistletoes, Arceuthobium. II. Homology of the Endophytic System

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