Structure and Development of the Vegetative Shoot Tip of Liriodendron Tulipifera L.

Millington, W. F.; Gunckel, James E.

doi:10.1002/j.1537-2197.1950.tb12203.x

Cited by 29 publications

(14 citation statements)

References 28 publications

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“…The type of sheath formation found in Michelia, an unusual one for dicotyledons, is associated with the extensive marginal growth which occurs while the leaf is still the youngest present, as shown in Fig. 11A-E. Eichler (1861) and Millington and Gunckel (1950) describe an essentially similar type of marginal encirclement in the leaf of Liriodendron, another magnoliaceous tree. Hagemann (1960) verifies their work on Liriodendron, and describes a similar pattern of ontogeny in Magnolia yulan.…”

Section: Stmentioning

confidence: 89%

“…It is of interest to compare sclereid formation in Michelia, which grows continuously throughout the year with that of the deciduous magnoliaceous genus Liriodendron. Millington and Gunckel (1950) found that Liriodendron forms sclereid plates only during the most active period of growth from early March to early July. At other times of year, the sclereid plates are missing in the portions of the stem being laid down.…”

Section: Stmentioning

confidence: 97%

“…Possibly the lack of periodic fluctuation results from the slow but continuous rate of growth in the Michelia apex. Interestingly, no seasonal changes in configuration are reported for Liriodendron according to Millington and Gunckel (1950).…”

Section: Stmentioning

confidence: 98%

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Ontogeny and Phyllotaxis of the Terminal Vegetative Shoots of Michelia Fuscata

Tucker

1962

American J of Botany

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TUCKER. SHIRLEY C. (Northwestern U., Evanston, Ill.) Ontogeny and phyllotaxis of the terminal vegetative shoots of Michelia fuscata. Amer. Jour. Bot. 49 (7): 722-737. Illus. 1962.-Two patterns of symmetry occur in Micheliafuscata In the lead shoots, leaves arise in a % spiral arrangement which may be either clockwise or counterclockwise. Other shoots are dorsiventrally organized; these shoots produce leaves in a modified Y2 phyllotaxis in which the angle between the 2 files of leaves lies between 100°and 150°, according to the particular branch. Both types of shoot have a zonate apical meristem with a biseriate tunica a central initial zone, and a peripheral . zone. The apical configuration of cells does not change appreciably during the plastochron. The flat to low-convex outline of the shoot apex is maintained by initiation of the leaves close to the summit of the apex; the diameter of the meristem diminishes greatly after such an initiation. Leaf inception in the subsurface tunica layer is followed by precocious activity of the marginal meristems which extend the stipular flanges completely around the base of the apical meristem, The stipular margins then fuse laterally and form a hood over the apex. A subapical initial meanwhile is active in the leaf blade, where it persists up to the time the leaf is 2 mm high. The most recent primordium is 300J< high before another leaf is initiated. The vascular system of the stem is a cylindrical network of leaf traces, with 6-12 traces per leaf. The procambium develops acropetally from preexisting vascular strands in the stem below. Elements of the diverse sclereid system differ in shape in different tissues, according to the availability of intercellular space. Goebel's term "Pendelsymmetrie" is discussed with reference to apical activity in Michelia.

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Section: Stmentioning

confidence: 89%

Section: Stmentioning

confidence: 97%

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Ontogeny and Phyllotaxis of the Terminal Vegetative Shoots of Michelia Fuscata

Tucker

1962

American J of Botany

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“…Observation of phyllotaxis in Magnoliaceae has interested botanists for over a century. Early in 1881, Eichler noticed that buds of Liriodendron L. exhibit a 1/2 phyllotaxis, while in older portion of the same shoots become a 2/5 phyllotaxis (Millington andGunckel 1950, Tucker 1962). Further reports of phyllotaxis in Magnoliaceae include findings of a 2/5 spiral phyllotaxis in terminal buds and shoots, and distichous phyllotaxis in lateral buds and shoots in Michelia L. (Tucker 1962(Tucker , 1963.…”

mentioning

confidence: 99%

Phyllotaxis of vegetative shoots, lamina rotation and their systematic implication in Magnoliaceae

Liao¹,

Xia²

2007

Nordic Journal of Botany

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Phyllotaxis in vegetative shoots and lamina rotation of Magnoliaceae are described. Most genera in Magnoliaceae investigated (except Parakmeria, Manglietiastrum and Pachylarnax) show lamina rotation. Paraphoric, a new type of lamina rotation differing from four other types depicted by Charlton is clarified. Manglietia, Parakmeria, Manglietiastrum, Talauma, section Gwillimia and Rytidospermum in subgenus Magnolia, shoots of Woonyoungia, section Theorhodon and Liriodendron have spiral phyllotaxis, however Magnolia section Oyama and Maingola, Alcimandra, Michelia, Paramichelia, Tsoogiodendron, buds of Woonyoungia, section Theorhodon and Liriodendron have distichous phyllotaxis. The systematic implication of vegetative shoot phyllotaxis and lamina rotation in Magnoliaceae is discussed in this paper.

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“…Apical and leaf ontogeny have been studied in detail in the following magnoliaceous taxa: the deciduous Liriodendron tulipifera (Millington and Gunckel, 1950;Hagemann, 1960;Pray, 1955); Magnolia yulan (Hagemann, 1960), and the evergreen Micheliafigo (M.fuscata) (Tucker, 1962). Less detailed or less ex-I Received for publication 18 December 1980;revision accepted 9 November 1981. This publication represents a portion of a dissertation submitted by the senior author to the Graduate School of Louisiana State University in partial fulfillment of the requirements of a Ph.D. degree.…”

mentioning

confidence: 99%

Foliar Ontogeny and Histogenesis in Magnolia Grandiflora L. I. Apical Organization and Early Development

Poster

Tucker

1982

American J of Botany

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Foliar ontogeny of Magnolia grandiflora was studied to elucidate possible unique features of evergreen leaves and their development. The apex of Magnolia grandiflora is composed of a biseriate or triseriate tunica overlying a central initial zone, a peripheral zone and a pith rib meristem. Leaf primordia are initiated by periclinal divisions on the apical flank of the tunica in its second layer. This initiation and expansion is seasonal just as in related deciduous magnolias. Following leaf initiation, a foliar buttress is formed and the leaf base gradually extends around the apex. As growth continues, separation of the leaf blade primordium from the stipule proceeds by intensified anticlinal divisions in the surface and subsurface layers near the base. Marginal growth begins in the blade primordium when it reaches approximately 200 μm in height and results in the formation of two wing‐like extensions, the lamina. This young blade remains in a conduplicately folded position next to the stipule until bud break.

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Structure and Development of the Vegetative Shoot Tip of Liriodendron Tulipifera L.

Cited by 29 publications

References 28 publications

Ontogeny and Phyllotaxis of the Terminal Vegetative Shoots of Michelia Fuscata

Ontogeny and Phyllotaxis of the Terminal Vegetative Shoots of Michelia Fuscata

Phyllotaxis of vegetative shoots, lamina rotation and their systematic implication in Magnoliaceae

Foliar Ontogeny and Histogenesis in Magnolia Grandiflora L. I. Apical Organization and Early Development

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