Intervention of Internal Correlations in the Morphogenesis of Higher Plants

Nozeran, René; Bancilhon, Line; Neville, P.

doi:10.1016/b978-0-12-028609-6.50005-4

Cited by 39 publications

(21 citation statements)

References 40 publications

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“…Most trees have zones that retain a degree of juvenility longer than other areas of the tree.16 Roots often retain juvenility, and thus a capacity for vegetative propagation and juvenile type of growth, for a long time. 17 Harvesting shoots close to the root system did not improve the growth in culture of mature Hevea (data not presented). Although mature meristems are considered to be more stable, both in vitro and in vivo, their phase related characteristics had been changed as a result of in vitro c~l t u r e .~~~'~ Multiple grafting of scions from the selected mature trees onto seedling root stocks has been used effectively in some conifer^.^^^^^ Once the graft is successful and the scion has grown, the tip ofthe new shoot is grafted onto another seedling.…”

Section: Discussionmentioning

confidence: 99%

The Growth Phase and Its Effect on Bud Proliferation and Growth of in Vitro Culture of Hevea Brasiliensis

Seneviratne¹,

Wijesekara²

1994

J. Natn. Sci. Foundation Sri Lanka

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Abstract:The physiological growth state of the plant when explants are haivested, is themost important factor in micropropagation ofHeuecr bmsiliensis.Nodal explanta, removed from 4-Sy old trees behaved similarly to those harvested from few weeks old embryo cultured plants. But, the explants from clonal trees which are mature were not as responsive as juvenile materials a t any age of growth. The differences in behaviour of the two types of shoots included the culture establishment due to the daculties in surface sterilization and phenolic browning associated with clonal materials. However, nodal explants were better than shoot apices for axillary shoot growth of both clonal and juvenile materials of Hevea sp. Manipulation of the stock plants is more important than the culture medium or technique when working with clonal materials of Hevea.

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Section: Discussionmentioning

confidence: 99%

The Growth Phase and Its Effect on Bud Proliferation and Growth of in Vitro Culture of Hevea Brasiliensis

Seneviratne¹,

Wijesekara²

1994

J. Natn. Sci. Foundation Sri Lanka

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“…Ainsi en est-il du plagiotropisme du rameau axillaire de Phyllantus, induit par le meristeme terminal qui le forme. La stabilite de la differenciation est telle que meme bouture un rameau plagiotrope conserve indefiniment son orientation initiale (Bancilhon, 1965 ;Nozeran et al, 1971 ). Un autre exemple d'inhibition correlative est l'effet inhibiteur ou promoteur qu'exerce frequemment et selon les especes le systeme racinaire sur la floraison (Miginiac, 1978 ;Bernier et Kinet, 1985;Poethig, 1990).…”

Section: Introductionunclassified

Le potentiel de développement d'un rameau de Géranium rosat (Pelargoniumsp.) est déterminé par les conditions de croissance présidant à la formation du bourgeon dont il est issu

Vincent¹

1996

Acta Botanica Gallica

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To cite this article: Grégoire Vincent (1996) Le potentiel de développement d'un rameau de Géranium rosat (Pelargonium sp.) est déterminé par les conditions de croissance présidant à la formation du bourgeon dont il est issu, Acta Botanica Gallica, 143:1, 37-45, DOI: 10.1080/12538078.1996 Resume.-Differentes manipulations (taille, effeuillage et transplantation) sont realisees sur un hybride interspecifique ligneux de Pelargonium pour evaluer !'importance des correlations de croissance entre rameaux. Bien qu'il existe une regulation globale a l'echelle de Ia plante com me l'atteste par exemple Ia croissance compensatoire apres une taille severe, il apparait difficile d'exhiber par des tailles selectives une quelconque interdependance entre rameaux voisins. Par effeuillage partie!, dans Ia fraction apicale d'un rameau, on peut cependant mettre en evidence !'existence d'un haul niveau d'integration physiologique entre organes jeunes en developpement. Entin, !'experimentation de transplantation montre que des rameaux axillaires inities en condition de stress garden! un developpement reduit une lois que les conditions delavorables cessent. Puisque des phenomenes d'inhibition correlative sont peu vraisemblables, on conclut a Ia memorisation au niveau des apex du stress encouru. Une hypothese concernant Ia nature de cette memoire est proposee permettant d'orienter de futurs travaux.Summary.-Pruning, defoliation and transplanting experiments were carried out ona woody hybrid of Pelargonium in order to assess the importance of correlative inhibition. Compensatory growth following pruning appears to be an essentially global property of the plant : no direct correlation was found between neighbouring shoots. Nevertheless strong physiological integration exists in the apical part of the shoot where reaction to pinching or defoliation will develop. Basal shoots of a plant, whose early development takes place in a stressed environment, show a substantial underdevelopment once replaced in favourable conditions. Since competition or correlative inhibition can hardly be invoked here it is concluded that some memory of the suffered stress is kept at the level of the apex. A possible nature of this imprint is put forward.

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“…After a continuous treatment on this medium for a length of time (Ti) of 3,6,9,12,15,18,20,22,24, 26, 29, 32, 36, 42 or 48 hr at 27 C with a 16-hr daily light period, the segments were either transferred to an identical medium but without [3Hjthymidine or underwent immediate fixation. In the latter case, the epidermis (10 x 2.5 mm) which was in contact with the radioactive medium was peeled from the segment with no adjacent parenchyma tissue and fixed in Brachet fixative (13) for 1 hr.…”

Section: Methodsmentioning

confidence: 99%

“…5) to a mean value of 1.4 for cells which synthesized at the 48-hr stage. Between these two stages, the relation decreased rapidly from 20 …”

Section: Observation Of Division In Epmernal Cells Up To the 5-daymentioning

confidence: 99%

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Intercellular Correlations: Relation between DNA Synthesis and Cell Division in Early Stages of in Vitro Bud Neoformation

Chlyah¹

1978

Plant Physiol.

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In order to study these correlations even more it seemed necessary to work on the cellular level; in 1966, Lang (12) discussed the problem of "intercellular regulation in plants." In defined in vitro conditions, certain epidermal cells of T fournieri stem segments embark on cell division ultimately leading to bud neoformation. The correlations which these particular cells undergo would be different from those of other epidermal cells. In a previous study, it was shown that cell division centers, observed at the 5-day stage, are not formed at random on the stem epidermis but in relation to the position of underlying vascular tissue (9). An interpretation of this phenomenon, based on hormone movement from this vascular tissue, was put forward. This hormone movement would be one of the correlative factors unequally influencing epidermal cells. For the same material, it has also been shown that among the epidermal cells which divide and go on to form cell division centers, not all form bud meristems (7,24). A certain competition among these centers for nutrient or hormonal factors would mean further changes in intercellular correlations in the epidermal layer.It should be possible to define different cell populations among epidermal cells depending on their position and the different correlations to which they are submitted. The present study has been undertaken to characterize these cell populations at a very early stage of organogenesis according to the time of DNA synthesis and that of entry into division. Several authors (3, 10, 11, 14-16) have analyzed cell populations in stem or root meristems but, perhaps for lack of simple techniques, never in single differentiated cell layers capable of organogenesis. MATERIALS AND METHODSStem segments of T fournieri Lind, 10 mm long, were cultured aseptically on a simple medium previously described (6), to which [3HJthymidine was added at 0.025 mCi ml-'. The wide face of the stem (which was rectangular in section) was applied to the radioactive medium; only the epidermal cells of this side were studied in the present article.After a continuous treatment on this medium for a length of time (Ti) of 3,6,9,12,15,18,20,22,24, 26, 29, 32, 36, 42 or 48 hr at 27 C with a 16-hr daily light period, the segments were either transferred to an identical medium but without [3Hjthymidine or underwent immediate fixation. In the latter case, the epidermis (10 x 2.5 mm) which was in contact with the radioactive medium was peeled from the segment with no adjacent parenchyma tissue and fixed in Brachet fixative (13) for 1 hr. It was then rinsed for 3 hr in tap water and spread and dried on a slide previously coated with a 0.5% (w/v) gelatin solution. The slides were then covered with Kodak ARIO stripping film for autoradiography in a dark room where they were left for 7 days. They were then developed using photographic products before microscopic observation.The explants transferred to a nonradioactive medium were first rinsed (30 min) in an unlabeled thymidine solution, then placed ...

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Intervention of Internal Correlations in the Morphogenesis of Higher Plants

Cited by 39 publications

References 40 publications

The Growth Phase and Its Effect on Bud Proliferation and Growth of in Vitro Culture of Hevea Brasiliensis

The Growth Phase and Its Effect on Bud Proliferation and Growth of in Vitro Culture of Hevea Brasiliensis

Le potentiel de développement d'un rameau de Géranium rosat (Pelargoniumsp.) est déterminé par les conditions de croissance présidant à la formation du bourgeon dont il est issu

Intercellular Correlations: Relation between DNA Synthesis and Cell Division in Early Stages of in Vitro Bud Neoformation

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