SOME ASPECTS OF THE DEVELOPMENTAL ANATOMY OF THE‘LONG’SHOOT IN <i>LARIX DECIDUA</i> MILL., WITH PARTICULAR REFERENCE TO SEASONAL PERIODICITY*

Frampton, C. V.

doi:10.1111/j.1469-8137.1960.tb06215.x

Cited by 18 publications

(9 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This does not allow for neoformed leaf production, which is well established in Larix (Mitchell 1965;Kozlowski 1967, 1970;Fujimoto 1978;Owens and Molder 1979;Remphrey and Powell 1984b). Later, however, when writing of the most vigorous type of terminal bud, Frampton (1960) Frampton also drew for the "end of July" a longitudinal section of what appears to be a recently formed terminal bud. In terms of the current study and observations of L. decidua (G. R. Powell, unpublished data), Frampton's buds were far from "the most vigorous type", the shoots used were relatively weak and the descriptions contain inconsistencies.…”

Section: Discussionmentioning

confidence: 85%

“…The timing of terminal-bud formation evident from dissections in the current study must be contrasted with the timing indicated from sectioning for L. occidentalis by Owens and Molder (1979), and to some extent from investigation of L. decidua by Frampton (1960). Owens and Molder (1979) found bud-scale formation to occur during May starting at about the time of bud burst and following a month-long period of leaf-primordium production (neoformation).…”

Section: Discussionmentioning

confidence: 93%

“…Unless L. occidentalis is different from other Larix species, this finding fits only shoots as weak as those they used. Frampton (1960), for L. decidua, indicated that lateral buds "emerged" in acropetal succession while the axial portion of the long shoot was still within the basal leaf cluster and that the majority were present in late June. He thus allowed for formation of some buds later.…”

Section: Discussionmentioning

confidence: 97%

“…Their shoots were from "upper one-third and lower one-third" portions of the crowns of 10-to 20-year-old trees, or from "upper and lower regions" of the crowns of 50-year-old trees. Frampton (1960) stated that bud scales of new terminal buds of long shoots begin to form before bursting of the parent long-shoot bud. This does not allow for neoformed leaf production, which is well established in Larix (Mitchell 1965;Kozlowski 1967, 1970;Fujimoto 1978;Owens and Molder 1979;Remphrey and Powell 1984b).…”

Section: Discussionmentioning

confidence: 99%

“…Frampton 1960;Fujimoto 1978;Owens and Molder 1979). They appear to relate to differences in vigour of the subject matter used in the various investigations.…”

Section: Introductionmentioning

confidence: 90%

See 4 more Smart Citations

Shoot elongation, leaf demography and bud formation in relation to branch position on Larix laricina saplings

Powell

1988

Trees

View full text Add to dashboard Cite

Summary. Shoot development was investigated on branches of Larix laricina (Du Roi) K. Koch trees growing in their 8th year in two plantations and in a natural stand approximately 12 years old. Expansion of throughout-crown series of short and long shoots was measured weekly, and later colour change and natural fall of leaves were assessed. Similar shoots were collected at intervals and dissected, the long shoots by 25-leaf segments. Leaf area and weight, as well as time of bud formation, were determined. Increasing acropetal trends were evident in time to bud burst: duration of short-shoot leaf-cluster expansion; size of leaf clusters and number, area and weight of leaves per cluster; duration and rate of longshoot elongation; number, area and weight of leaves on long shoots; time to terminal-bud formation on long shoots. Along each long shoot, stem and leaf elongation and lateral-axis formation progressed acropetally. Lateral axes were most numerous on second to fourth 25-leaf segments. On longer shoots, some axes in middle segments developed as sylleptic short shoots rather than as lateral buds. Leaves of short shoots and basal leaves on long shoots turned yellow and abscissed sooner than axial leaves on long shoots. Colour change and loss among axial leaves were acropetal along shoots and up the crown. Thus, last-formed leaves, in axils of some of which lastformed lateral buds occurred, were held longest.

show abstract

Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

“…Frampton 1960;Fujimoto 1978;Owens and Molder 1979). They appear to relate to differences in vigour of the subject matter used in the various investigations.…”

Section: Introductionmentioning

confidence: 90%

See 3 more Smart Citations

Shoot elongation, leaf demography and bud formation in relation to branch position on Larix laricina saplings

Powell

1988

Trees

View full text Add to dashboard Cite

show abstract

The Chemical Regulation of the Dormancy Phases of Bud Development

Smith

Kefford

1964

American J of Botany

View full text Add to dashboard Cite

literature pertaining to the development and regulation of dormancy in the buds of woody species is reviewed and interpreted as follows. Morphological observations, the effects of environmental factors, and other evidence support the concept that bud dormancy involves a cycle of 3 separate phases of development. Beginning at the developmental pattern of spring, the 3 phases are: (1) dormancy development leading to the dormant state; (2) release from dormancy leading to the non‐dormant state; and (3) the initiation of spring burst leading again to spring development. The regulation of dormancy is, therefore, discussed in terms of the regulation of development of the apex within each phase and the regulation of transitions between phases. The principal existing theory of dormancy regulation implies that dormancy consists, in total, of merely the inhibition of spring development, and that regulation involves first the accumulation of an inhibitor then its disappearance. The conceptual basis of this inhibitor theory is argued to be inadequate as is the experimental evidence for the existence of a specific inhibitor and for a correlation between its concentration and dormancy induction or release. There is little direct evidence on the mechanism of the regulation of bud development within any developmental phase. Circumstantial evidence suggests the developmental patterns arise from chemical patterns resulting from the interactions of classes of growth regulator such as auxin, kinin, and gibberellin. Some evidence exists concerning the regulation of the transitions between the phases of dormancy. A substance has recently been detected which may be a hormone regulating the initiation of dormancy development. The production of this substance may be photoperiodically determined. A role for gibberellins in the regulation of dormancy release has been postulated.

show abstract

The Developmental Anatomy of Long‐branch Terminal Buds of Pinus Banksiana

Curtis

Popham

1972

American J of Botany

View full text Add to dashboard Cite

A study of the composition of long‐branch terminal buds (LBTB) of Pinus banksiana Lamb. and the yearly periodicity associated with their formation, development, and elongation was undertaken. Each LBTB has lateral bud zones and zones of cataphylls lacking axillary buds. When present, staminate cone primordia differentiate from the lowest lateral buds in the lowest lateral bud zone of the LBTB. Ovulate cone primordia and lateral long‐branch buds can differentiate from the upper lateral buds in any lateral bud zone. When both types of buds are present, lateral long‐branch buds are uppermost. Dwarf‐branch buds occur in all lateral bud zones. During spring LBTB internodes elongate, new cataphylls are initiated, dwarf branches elongate, needles form and elongate, pollen forms and is released, and ovulate cones are pollinated. During summer buds form in the axils of the newly formed cataphylls. By early fall the new LBTB are in overwintering condition and the four types of lateral buds are discernable. The cytohistological zonation of the LBTB shoot apex is similar to that of more than 20 other conifer species. Cells in shoot apices of pine are usually arranged in distinct zones: apical initials, subapical initials, central meristem, and peripheral meristem. Periclinal divisions occur in the surface cells of the apex; therefore no tunica is present. At any given time, shoot apex volume and shape vary among LBTB in various positions on a tree. In any one LBTB on a tree, shoot apex shape changes from a low dome during spring to a high dome during summer to an intermediate shape through fall and winter.

show abstract

SOME ASPECTS OF THE DEVELOPMENTAL ANATOMY OF THE‘LONG’SHOOT IN LARIX DECIDUA MILL., WITH PARTICULAR REFERENCE TO SEASONAL PERIODICITY*

Cited by 18 publications

References 22 publications

Shoot elongation, leaf demography and bud formation in relation to branch position on Larix laricina saplings

Shoot elongation, leaf demography and bud formation in relation to branch position on Larix laricina saplings

The Chemical Regulation of the Dormancy Phases of Bud Development

The Developmental Anatomy of Long‐branch Terminal Buds of Pinus Banksiana

Contact Info

Product

Resources

About