Cytokinins in <i>Populus</i>×<i>robusta</i>: Changes during Chilling and Bud Burst

Hewett, E.W.; Wareing, P. F.

doi:10.1111/j.1399-3054.1973.tb08577.x

Cited by 104 publications

(37 citation statements)

References 31 publications

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“…Indeed, some authors believe that treatments with gibberellins can substitute winter chilling (HATCH & WALKER, 1969;WALSER et al, 1981). The rdative inefficiency of kinetin observed by us in this period agrees with the indications that cytokinins probably have some supplementary function in dormancy removal, but are not the primary agent (LAVEE, 1973;HEWETT & WAREING, 1973). The stimulation of sprouting by cytokinins sometimes observed at the end of summer or beginning of autumn (ARIAS & CRABBE, 1975) seems to be in agreement with their generally accepted efficacy in opposing correlative inhibition, such as apical dominance and leaf influence, no longer relevant in autumn-winter.…”

Section: Discussionsupporting

confidence: 87%

Dormancy ofFagus sylvaticaL. buds III. Temperature and hormones in the evolution of dormancy in one-node cuttings

Falusi¹,

Calamassi²

2003

Plant Biosystems - An International Journal Dealing with all As

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Section: Discussionsupporting

confidence: 87%

Dormancy ofFagus sylvaticaL. buds III. Temperature and hormones in the evolution of dormancy in one-node cuttings

Falusi¹,

Calamassi²

2003

Plant Biosystems - An International Journal Dealing with all As

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“…There is a marked increase in cytokinin activity in the ascending xylem sap during bud burst in some woody perennials (7,10,24) been shown to promote the growth of flowers in grapevine cuttings (14). In the present experiment, inflorescences and flowers have been made to grow on young grapevine tendrils by treatment with cytokinins.…”

Section: Discussionmentioning

confidence: 93%

Control of Flowering in the Grapevine (Vitis vinifera L.)

Srinivasan

Mullins²

1978

Plant Physiol.

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Tendrils produced from shoot tips of grapevine (Vitis vinifera L.) cultured in vitro on Nitsch's medium developed into inflorescences when 5 to 10 jM benzyladenine (BA) or 6-(benzylamino)-9-(2-tetrabydropyranyl)-9H-purine (PBA) were applied directly to the tendril tips.Inflorescences did not form on tendrils if the cytokinins were supplied in the agar. Tendrils cultured in agitated liquid medium containing BA, PBA, or zeatin riboside showed profuse branching and tendrils were transformed into inflorescences. Calyx and corolla (calyptra) stamens and pistils developed normally in the presence of both zeatin riboside and PBA, but micro-and macrosporogenesis were absent.Inflorescences were formed by tendrils from five cultivars (Muscat of Alexandria, Shiraz, Carbernet Sauvignon, Wortley Hail, and Sultana syn. Thomson Seedless) and also on tendrils from 12-to 15-week-oldseedlings.The physiology of flowering in photoperiodically controlled herbaceous plants has been the subject of intensive research (3,4, 30) (27).Flowering in grapes is a three-step process: (a) formation of anlagen; (b) differentiation of inflorescence primordia; and (c) formation of flowers. Anlagen are undifferentiated or uncommitted primordia which arise from terminal or axillary bud apices. Anlagen are formed in the current season and give rise either to inflorescence primordia or to tendril primordia. Usually, flowers are formed from inflorescence primordia at the time of bud burst in the following season (12,21,27).Inflorescences and tendrils are both derived from anlagen and are homologous organs (1). Anlagen which undergo repeated branching give rise to inflorescences while those which produce only two or three branches give rise to tendrils (27). Accordingly, grapevine tendrils can be interpreted as weakly differentiated inflorescences. It follows that the control of inflorescence formation in grapes hinges upon the control of branching of anlagen or of tendrils.The present paper is concerned with the nature of the stimuli which affect branching and this has been studied by growing I T. L. Pawlett Postgraduate Scholar.isolated apices and tendrils in aseptic culture with various growth substances. Most experiments were carried out with explants from cuttings of grape cultivars but explants were also taken from open pollinated grape seedlings. In seedlings the first tendrils are formed at nodes 9 to 15, a few weeks after germination, but the first inflorescences may take 3 to 5 years to make their appearance in the field. In this paper we report on the formation of inflorescences and flowers in vitro from tendrils of grape cultivars and from the tendrils of 12-to 15-week-old seedlings.MATERIALS AND METHODS Rooted cuttings of the grapevine (cvs. Muscat of Alexandria, Shiraz, Cabernet Sauvignon, Wortley Hall, and Sultana syn. Thompson Seedless), were propagated from cool stored (4 C) canes as described previously (27). Grape seeds were extracted from winery marc and stratified (4 C) with perlite for at least 7 weeks before sowing.Late...

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“…Generally each of these explants formed only 1 shoot. It has been suggested that developing Populus shoots are a strong sink for cytokinins [12,18], which might explain a reduction in further shoot formation. This is also consistent with results reported by Douglas [8].…”

Section: Discussionmentioning

confidence: 99%

In vitro propagation of Populus x wilsocarpa ? a hybrid of ornamental value

Welander

Jansson

Lindqvist

1989

Plant Cell Tiss Organ Cult

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Populus × wilsocarpa, a hybrid of important ornamental value, cannot be seedpropagated, nor grafted, since a compatible rootstock has not been identified. A micropropagation protocol consisting of a series of steps was therefore developed to facilitate the commercial production of this species. The technique involved the transfer of swelling buds to a growth initiation medium with the following composition: N6 macronutrients, MS micronutrients and vitamins supplemented with 0.5mgl -~ BAP. The best buds were from dormant twigs, stored at 0-2 °C and then forced to burst prior to culture initiation. Shoot multiplication was on a basal WPM medium including 0.1 mg 1-l BAP and 0.001 mg 1-~ NAA. Shoot elongation and rooting was also on a basal WPM medium supplemented with 1.0 mg 1-GA 3 followed by a transfer to a peat-perlite mix in the greenhouse.

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Cytokinins in Populus×robusta: Changes during Chilling and Bud Burst

Cited by 104 publications

References 31 publications

Dormancy ofFagus sylvaticaL. buds III. Temperature and hormones in the evolution of dormancy in one-node cuttings

Dormancy ofFagus sylvaticaL. buds III. Temperature and hormones in the evolution of dormancy in one-node cuttings

Control of Flowering in the Grapevine (Vitis vinifera L.)

In vitro propagation of Populus x wilsocarpa ? a hybrid of ornamental value

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