Seasonal variations in the pattern of RNA metabolism of tuber tissue in response to excision and culture

MacLeod, Alexander J.; Mills, Elena; Yeoman, M. M.

doi:10.1007/bf01676565

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…In cultures of the Jeruzalem artichoke the tuber cells also show a two-phasic process during callus initiation (Macleod et al 1979). The ultrastructural changes are quite similar to those in cultured maize embryos (Yeoman & Street 1977;Fransz & Schel 1987).…”

Section: Discussionmentioning

confidence: 86%

Cell cycle changes during callus initiation from cultured maize embryos. An autoradiographic study

Fransz

Kieft

Schel

1990

Acta Botanica Neerlandica

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Cell cycle changes were examined in various scutellar regions of immature maize embryos during a total culture period of72 h on a modified MS agar medium containing I mg 1-1 2,4-0 and 6% sucrose. At intervals of 8 h embryos were sampled and transferred to the MS medium supplemented with 5~Ci ml-I [,H]thymidine and incubated for 8 h. The fraction oflabelled nuclei was determined for each interval and a comparison was made between the scutellar regions. During the first day, identical changes in the fraction of labelled nuclei and the mitotic index were observed in all scutellar regions. After the first day, however, various regions showed different cell cycles. The areas from which callus originated were mitotically active, showing high numbers oflabelled nuclei, up to 60%. Furthermore, a difference was observed between the adaxial and the abaxial regions concerning the sequence of cell cycle changes. It is concluded that, after the initiation of the in-vitro culture, a shock response and a growth response are manifested, as observed by changes in the cell cycle. These responses proved to be different for the various regions of the immature embryos.

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Section: Discussionmentioning

confidence: 86%

Cell cycle changes during callus initiation from cultured maize embryos. An autoradiographic study

Fransz

Kieft

Schel

1990

Acta Botanica Neerlandica

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Rhythmic changes in transcriptional activity during the development of potato tubers

Wechselberger

Wielgat

Kahl

1979

Planta

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Chromatin-bound, DNA-dependent RNA polymerase (EC 2.7.7.6) activity and chromatin template availability, as measured with saturating amounts of E. coli RNA polymerase, changes rhythmically during the formation, dormancy, and sprouting of potato tubers. Active growth processes coincide with the highest RNA polymerase activity as well as the greatest template accessibility, during tuberization and sprouting. Consequently, chromatin-associated RNA and protein content is highest in young developing tubers and in old tubers at the onset of sprouting. Ribosomal RNA content, in turn, is maximal in small tubers, remains constant during dormancy, and decreases when sprouting begins, probably due to the translocation of rRNA into the sprouts. The nucleolus changes its shape and size concomitantly with the process of tuberization.

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Cell cycle inHelianthus tuberosus tuber tissue in relation to dormancy

Bennici¹,

Gennai²,

Cionini³

1982

Protoplasma

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Seasonal variations in the pattern of RNA metabolism of tuber tissue in response to excision and culture

Cited by 5 publications

References 9 publications

Cell cycle changes during callus initiation from cultured maize embryos. An autoradiographic study

Cell cycle changes during callus initiation from cultured maize embryos. An autoradiographic study

Rhythmic changes in transcriptional activity during the development of potato tubers

Cell cycle inHelianthus tuberosus tuber tissue in relation to dormancy

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