Expansion growth is not the main driving force for cytokinin-promoted development of cotyledons

Longo, Giovanna P.; Rossi, G.; Fantelli, Raffaella; Bussolati, M.G.; Longo, Claudio P.

doi:10.1016/0304-4211(82)90157-2

Cited by 8 publications

(2 citation statements)

References 11 publications

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“…2), which indicated that this effect was largely independent of its growth-promoting activity. Recently a confirmation of our findings has come from results reported by Longo et al (1982), who found that 6-benzyladenine enhanced carotenoid content and hydroxypyruvate reductase activity even when the growth of watermelon cotyledons was completely suppressed by osmotic stress.…”

Section: Discussionsupporting

confidence: 89%

Cytokinin‐controlled polyribosome formation and protein synthesis in cucumber cotyledons

Gwóźdź¹,

Woźny²

1983

Physiologia Plantarum

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An increased proportion of ribosomes forming polyribosomes and an increased activity of polyribosomes in protein synthesis in vitro were found in dark‐grown kinetin‐treated cucumber cotyledons (Cucumis sativus L. cv. Monastyrski) as compared with untreated controls. The stimulation occurred also under an osmotic stress which suppressed the kinetin stimulation of the cotyledon growth, indicating an independence of the effect from the promotion of growth. Analysis of the ribosomal profiles as well as experiments with [3H]‐adenosine showed that kinetin neither changed the total amount of ribosomal material nor enhanced the label incorporation into the polyribosomes. Inhibitors of transcription and of polyadenylation did not affect the kinetin stimulation of the polyribosome level. Aurin tricarboxylic acid (inhibitor of initiation) markedly suppressed the stimulatory effect of kinetin on the polyribosome formation. It is suggested that the increase in polyribosomes in response to kinetin results from the kinetin effect at the translational level by increasing the rate of initiation through an enhancement of the affinity of ribosomes for the messenger RNA.

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Section: Discussionsupporting

confidence: 89%

Cytokinin‐controlled polyribosome formation and protein synthesis in cucumber cotyledons

Gwóźdź¹,

Woźny²

1983

Physiologia Plantarum

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“…In the presence of BA, cotyledon elongation did not occur and the effect was independent of the amount of light received (Treatments 2 to 5). Excised cotyledons of radish (Letham 1971) and watermelon (Longo et al 1982) both undergo expansion growth in response to exogenous CK. In radiata pine the expansion growth is associated with the differentiation of meristematic tissue on the cotyledon surface in contact with the medium.…”

Section: Discussionmentioning

confidence: 99%

Light‐cytokinin interaction in shoot formation in cultured cotyledon explants of radiata pine

Villalobos

Leung

Thorpe

1984

Physiologia Plantarum

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Previous studies utilizing cotyledon explants of radiata pine (Pinus radiata D. Don) revealed that cytokinin was required for shoot formation. This was confirmed and extended in the present study, which also showed that light was required. As little as three days of exposure to 16 h photoperiod light at a photon fluence rate of ca 80 μmol m−2 s−1 was sufficient to give some meristematic tissue formation. Longer exposure to light increased this formation. While cytokinin must be present during the first three days in culture for shoot formation, the exposure of the cotyledons to light could be delayed at least until day 10, but after 21 days in darkness, transfer to light did not permit shoot formation. Anatomical examination of the cotyledons confirmed the morphogenetic interactions of light and cytokinin in shoot formation. The data suggest that cytokinin is directly involved in the induction of shoot initiation and both light and cytokinin are required for the development of meristematic tissue and subsequent shoot formation.

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Growth

Amrhein¹

1983

Progress in Botany / Fortschritte Der Botanik

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Expansion growth is not the main driving force for cytokinin-promoted development of cotyledons

Cited by 8 publications

References 11 publications

Cytokinin‐controlled polyribosome formation and protein synthesis in cucumber cotyledons

Cytokinin‐controlled polyribosome formation and protein synthesis in cucumber cotyledons

Light‐cytokinin interaction in shoot formation in cultured cotyledon explants of radiata pine

Growth

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