Modification of the Developmental Axis by Centrifugation in &lt;i&gt;Pteris vittata&lt;/i&gt;

Ootaki, Tamotsu

doi:10.1508/cytologia.28.21

Cited by 19 publications

(9 citation statements)

References 11 publications

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“…The occurrence of branched protonemata, sitnilar to those of type C in the present study, has been reported in Pteris viiiata (Ootaki 1963). Basipetal hypergravity (+5 000 g for 15 tnin or +15 000 g for 1 min) resulted in branching of protonemata in P. vittata, but acropetal and lateral centrifugation did not have this effect.…”

Section: Effects Of Hypergravity On the Shape Of Protonematasupporting

confidence: 67%

“…In addition to microgravity, conditions of hypergravity, at more than -i-l g, are also useful for examination of the role of gravity on plant growth. Ootaki (1963) reported that the developmental axis of a fern, Pteris vittata, is modified by centrifugal force. It has also been reported that hypergravity (-3 to -t-3 g) affects the germination, cell differentiation and height of fruiting bodies in the cellular slime mold Dictyosteiiutn discoideutn (Kawasaki et al 1990).…”

Section: Introductionmentioning

confidence: 99%

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Effects of hypergravity on the elongation and morphology of protonemata of Adiantum capillus-veneris

Kasahara¹,

Yanagiya²,

Takeuchi³

et al. 1995

Physiol Plant

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Effects of hypergravity on the elongation and morphology of protonemata of Plant, Elongation growth of protonemata of Adiatitutn capillus-vetieris, which can be controlled by light irradiation, was examined under acropetal and basipetal hypergravity conditions (from -13 to -1-20 g) using a newly developed centrifugation equipment. Elongation of the protonemata under red light was inhibited by basipetal hypergravity at more than -Hi5 , <, ' but was promoted by acropetal hypergravity from -5 to -8 g. Division of the protonemal cells that was induced by white light was inhibited under basipetal hypergravity at -H20 g but was unaffected under acropetal hypergravity al -15 g. Upon exposure to continuous red light for 7 to 8 days, most of Ihe protonemata grew as filamentous cells in the absence of a change in the normal gravitational force (control), but more than half of the protonemal cells were abnormal in terms of shape when maintained under hypergravity at -f20 g.

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Section: Effects Of Hypergravity On the Shape Of Protonematasupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Effects of hypergravity on the elongation and morphology of protonemata of Adiantum capillus-veneris

Kasahara¹,

Yanagiya²,

Takeuchi³

et al. 1995

Physiol Plant

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“…Then the orientation of the nucleus and/or spindle is determined, which in turn determines the orientation of the new cell plate (14,15). Centrifugation is known to affect cell shape and/or cell plate position in filamentous cells (13,16), but little is known as to when premitotic positioning of the nucleus occurs in the cell cycle.…”

mentioning

confidence: 99%

Effect of Centrifugation on the Development and Timing of Premitotic Positioning of the Nucleus in Adiantum Protonemata

Mineyuki

Furuya

1980

Dev Growth Differ

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When single-celled protonemata of Adiantum capillus-veneris L. were centrifuged immediately before transferring to darkness from continuous irradiation with red light, their nuclei were displaced basipetally. Both filamentous and branched protonemata were obtained. The stronger the centrifugal acceleration, the more frequently the branched protonemata were induced.The effect of centrifugation at 1,300xg for 15 min on nuclear displacement was different at different stages of the cell cycle. In early GI phase, the nucleus was easily displaced by centrifugation, but quickly returned to the original position after centrifugation. In late G I phase, the nucleus was displaced, but after centrifugation it never came back to the original position. In late Ge and M phases, the nucleus was no longer displaced by the centrifugation. Premitotic positioning of the nucleus in cytokinesis took place about 5 hr before cell plate formation in all centrifugal treatments described above.

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“…In the case of an outgrowth, the new growth zone begins a t the nearest wall to the nucleus suggesting an important role of the nucleus. It was also shown that when apical cells were given a basally oriented centrifugal force, and the nucleus and cytoplasm accumulate in the basal ends, both the cell division and outgrowth occur a t the basal ends (OOTAKI, 1963).…”

Section: Discussionmentioning

confidence: 99%

INTRACELLULAR POSITION OF NUCLEAR DIVISION IN PROTONEMA OF PTERIS VITTATA

Ito¹

1969

Dev Growth Differ

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Modification of the Developmental Axis by Centrifugation in <i>Pteris vittata</i>

Cited by 19 publications

References 11 publications

Effects of hypergravity on the elongation and morphology of protonemata of Adiantum capillus-veneris

Effects of hypergravity on the elongation and morphology of protonemata of Adiantum capillus-veneris

Effect of Centrifugation on the Development and Timing of Premitotic Positioning of the Nucleus in Adiantum Protonemata

INTRACELLULAR POSITION OF NUCLEAR DIVISION IN PROTONEMA OF PTERIS VITTATA

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