Physiology of regeneration in cormophytes

Dore, J.

doi:10.1007/978-3-642-50088-6_41

Cited by 39 publications

(34 citation statements)

References 191 publications

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“…The formation of CLS in regenerating G. filiformis segments is in accordance with the :· :· :· "" AHIUAL 412 situation of higher plants where wounding is followed by the formation of a callus (Dore, 1965). Studies in the regeneration of some seaweed species have not reported the formation of callus or CLS as a wounding response, for example: Fucus vesiculosus (Fulcher & McCully, 1969;, Sargassum filipendula (Fagerberg & Dawes, 1976), Schottera nicaeensis (Perrone & Felicini, 1972; and Gelidium versicolor (Robaina etal., 1990).…”

Section: Discussionsupporting

confidence: 63%

Development of callus-like structures and plant regeneration in thallus segments of Grateloupia filiformis K�tzing (Rhodophyta)

1993

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Callus-like structures (CLS) were observed to develop from sectioned tissues of the thallus segments of Grateloupiafiliformis Kiltzing maintained in Von Stosch enriched-seawater culture medium. Three types were observed: dark CLS originated from pigmented cortical cells, clear CLS and loose clear CLS both originated from colorless medullary cells. Dark and clear CLS developed from segments exposed to light while loose clear CLS developed in darkness. Frequencies of different types of CLS varied according to the origin of the segments (apical, median and basal zones of primary branches). In order to assess the potential for plant regeneration, all CLS were isolated from the original segment and cultured under light. The potential for plant regeneration depends on the type of CLS and on the origin of the segments. The loose clear CLS and the CLS from apical segments produced the largest number of regenerated plantlets. Cultures of CLS might be an effective system for micropropagation in G. filiformis and light seems to be an important factor involved in mechanisms of plant regeneration.

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Section: Discussionsupporting

confidence: 63%

Development of callus-like structures and plant regeneration in thallus segments of Grateloupia filiformis K�tzing (Rhodophyta)

1993

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“…Treatments applied to sections could, of course, influence their auxin status through effects occurring before or after bud initiation or both. This concept of bud regeneration on roots occurring as a result of a release from auxin inhibition was developed from earlier investigations of regulatory mechanisms (reviewed by Dore 1965). The investigation of auxin effects on C. juncea root scctions confirms the earlier phenomena but experiments with other regulators suggest other facets to the mechanism for the regulation of regeneration.…”

Section: Discussionmentioning

confidence: 79%

“…In this case of regeneration, particular cells do not have a role that is predetermined while they are within the parent root; how a cell will react is determined by its location in the section which in turn is determined by chance during excision. These generalities, which investigators over many years have shown to apply to various species (Dore 1965), are important in defining the regenerating system and the possibilities for its regulation.…”

Section: Discussionmentioning

confidence: 97%

Organ Regeneration on Excised Roots of Chondrilla Juncea and Its Chemical Regulation

Kefford¹,

Caso²

1972

Aust. Jnl. Of Bio. Sci.

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Ab8tractThe effects of endogenous factors (plant age, section length, and section location) and environmental factors (temperature and mineral nutrition) upon organ regeneration on isolated root sections of Ohondrilla juncea L. were used to develop a standard assay system for the study of the chemical regulation of regeneration. Bud and root formation and its polarity in the presence of a variety of regulators alone and in combinations were observed quantitatively. Bud numbers were increased by auxin (low concentrations), cytokinin, and gibberellin treatments. High concentra· tions of auxin inhibited bud formation and this effect was reversed by antiauxin, cytokinin, or gibberellin. Adenine did not counteract auxin· induced bud inhibition but adenine and N·6·benzyladenine did counteract inhibition induced by the purine antagonist 2,6·diaminopurine. Numbers of regenerated roots were increased by auxin treatment and reduced by cytokinin and gibberellin treatment. On control and auxin· treated sections, bud formation was strongly polar and proximal and cytokinin and gibberellin treatments lessened the polarity. Growth retardants inhibited regeneration. Of a number of synthetic auxins tested, 2,4.dichlorophenoxy. acet.O.methylhydroxamic acid and 4·amino.3,5,6.trichloropicolinic acid were the most effective inhibitors of bud formation.Mechanisms for the regulation of regeneration are inferred from the results.

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“…Literature concerned with the role of endogeneous free and conjugated IAA and ABA is still scarce, and in some cases contradictory . We feel that a comment made by Dore in 1965 [12] is still relevant today ; he noted that the large volume of literature pertaining to the control of rooting by applied plant growth regulators. However, relatively few of these reports have attempted to correlate endogeneous levels of plant growth regulators or receptors with rooting, either in the rooting zone or more precisely at the cell level .…”

Section: Discussionmentioning

confidence: 99%

Endogeneous levels of indole-3-acetic acid and abscisic acid during the rooting of Cotinus coggygria cuttings taken at different times of the year

1991

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Cuttings of Cotinus coggyria cv Royal Purple rooted well in the spring but not at all later in the season . Levels of free and conjugated IAA and ABA were measured in cuttings taken at different times of the year. Hormones were measured in the leaf, the upper stem and the lower stem (rooting zone) . In cuttings taken in early June the level of IAA was much higher than that of conjugated IAA . In late July the opposite was found . No significant differences in ABA levels were found although the ABA/IAA ratio changed dramatically.

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Physiology of regeneration in cormophytes

Cited by 39 publications

References 191 publications

Development of callus-like structures and plant regeneration in thallus segments of Grateloupia filiformis K�tzing (Rhodophyta)

Development of callus-like structures and plant regeneration in thallus segments of Grateloupia filiformis K�tzing (Rhodophyta)

Organ Regeneration on Excised Roots of Chondrilla Juncea and Its Chemical Regulation

Endogeneous levels of indole-3-acetic acid and abscisic acid during the rooting of Cotinus coggygria cuttings taken at different times of the year

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