The response of white spruce (Picea glauca (Moench) Voss) shoot apices to exposures of chronic gamma radiation

Cecich, Robert A.; Miksche, Jerome P.

doi:10.1016/s0033-7560(70)80008-4

Cited by 11 publications

(11 citation statements)

References 27 publications

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“…DISCUSSIoN-The timing of morphogenetic events in this study was in close agreement with previous work on white spruce (Vanden Born, 1963;Cecich and Miksche, 1970). Cataphyll primordia are produced in white spruce in late May (Vanden Born, 1963).…”

Section: Results-the Sequence Of Morphogenetic Events Is Shown Insupporting

confidence: 91%

“…The histograms show the change in distribution of nuclei with different C levels (Fig. If this supposition is true, the entire apex might be undergoing a cyclic production of cells during the formation of needle primordia in July, August, and early September (Cecich and Miksche, 1970). On June 24 and 28 most nuclei were at 2C (G 1 ) ; from July 2 to July 8, most cells were at various stages of DNA synthesis (S) and 4C (G 2 ) .…”

Section: July 10mentioning

confidence: 96%

“…Camefort (1956) had also noted that vacuolization is important in establishing zonation. Cecich and Miksche (1970) reported a change in apex shape from a small dome to a cone (Fig. The increasing volume of the central mother cell zone (Cecich and Miksche, 1970) also aided in establishing zonation.…”

Section: July 10mentioning

confidence: 99%

“…In white spruce [Picea glauca (Moench) Voss] the apex of the elongating shoot is small and domeshaped (Cecich and Miksche, 1970). Cytohistological zonation becomes evident in late June, when vacuoles develop in the apical initials and RNA were fixed for 2 hr in 100 % ethano1:glacial acetic acid (3: 1) .…”

mentioning

confidence: 99%

“…For histological examination, sections were stained with chlorazol black E (Cecich and Miksche, 1970) with cover slips mounted in Permount. Cover slips for all other preparations were mounted in Euparol.…”

mentioning

confidence: 99%

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A Cytophotometric Study of Nucleic Acids and Proteins in the Shoot Apex of White Spruce

Cecich¹,

Lersten²,

Miksche³

1972

American Journal of Botany

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During the annual three‐phase growth cycle of white spruce [Picea glauca (Moench) Voss] the vegetative shoot apex changed in anatomical configuration. Relative amounts of DNA, histones, RNA, and proteins were measured in three cytohistological zones and were related to the anatomical changes during ontogeny. An extended period of DNA synthesis (S) and G2 preceded an increase in the number of apical initial cells which were part of the mammillary apex. While DNA and histones were generally synchronous during ontogeny, the ratio of DNA to histone increased on June 20. This loss of histone and subsequent increases in RNA and cytoplasmic proteins preceded the appearance of needle primordia on next year's apex. We propose that induction of the apex to reorganize and form needle primordia occurred when the DNA was in a 2C condition, following the loss of histone on June 20.

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Section: Results-the Sequence Of Morphogenetic Events Is Shown Insupporting

confidence: 91%

Section: July 10mentioning

confidence: 96%

Section: July 10mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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A Cytophotometric Study of Nucleic Acids and Proteins in the Shoot Apex of White Spruce

Cecich¹,

Lersten²,

Miksche³

1972

American Journal of Botany

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

Curtis

Popham

1972

American J of Botany

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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.

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A Cytophotometric Study of Nucleic Acids and Proteins in the Shoot Apex of White Spruce

Cecich

Lersten

Miksche

1972

American J of Botany

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The response of white spruce (Picea glauca (Moench) Voss) shoot apices to exposures of chronic gamma radiation

Cited by 11 publications

References 27 publications

A Cytophotometric Study of Nucleic Acids and Proteins in the Shoot Apex of White Spruce

A Cytophotometric Study of Nucleic Acids and Proteins in the Shoot Apex of White Spruce

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

A Cytophotometric Study of Nucleic Acids and Proteins in the Shoot Apex of White Spruce

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