Gibberellins and the photosensitivity of isolated embryos from non-stratified apple seeds

@article{Smoleska1971GibberellinsAT,
  title={Gibberellins and the photosensitivity of isolated embryos from non-stratified apple seeds},
  author={Gabriela Smoleńska and Stanisław Lewak},
  journal={Planta},
  year={1971},
  volume={99},
  pages={144-153},
  url={https://api.semanticscholar.org/CorpusID:8698155}
}
These experiments suggest that the phytochrome system participates in the regulation of GAs biosynthesis by mediating one of the last steps of GA4 formation.
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19 Citations
Background Citations
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19 Citations

Jasmonic acid affects dormancy and sugar catabolism in germinating apple embryos

The role of lipases in the germination of dormant apple embryos

It is suggested that light stimulates germination of dormant apple embryos by promoting GA4 biosynthesis via the phytochrome system; GA4 increases the activity of alkaline lipase, the enzyme hydrolysing the storage lipids.

Interaction of jasmonic acid with some plant growth regulators in the control of apple (Malus domestica) embryo germination

It is concluded that JA does not act on the regulatory pathway that is initiated by light and which leads to embryo germination through gibberellin accumulation and alkaline lipase activation, and ABA and HCN appear to be involved in the control of this pathway.

Free and conjugated gibberellins in dormancy and germination of apple seeds

The equivalence between changes in free and conjugated GAs suggests that formation and hydrolysis of conjugates are involved in the control of the physiologically active levels of free GA4+7 and GA9.

Metabolic control of embryonic dormancy in apple seed: seven decades of research

This review summarizes published data related to the modes of action of above factors on the changes in the levels of endogenous hormones and some other plant growth regulators, and on certain enzymes involved in mobilization of seed reserves and catabolism of their hydrolysis products.

Some reflections on the relationship between endogenous hormones and light-mediated seed dormancy

It is concluded that gibberellins are primarily involved in post-dormancy metabolic processes leading to embryo growth and radicle emergence, such as food reserve mobilisation and endosperm softening.

Phloridzin transformation and accumulation during the stratification of apple seeds and the culture of isolated embryos

It is postulated that phloridzin accumulation and its glucosidase activity are indirectly related to the after-ripening process and directly to the germination of the embryos.

Photocontrol of gibberellin levels as related to the unrolling of etiolated wheat leaves

The production of some of the GA-like activity appears to possess a similar escapetime from far-red reversibility to leaf unrolling and is sensitive to Amo 1618.

The influence of cytokinins on apple embryo photosensitivity and acid phosphatase activity during stratification

Both cytokinins decrease the photosensitivity of embryos isolated from the seeds stratified less than one month, but only BA accelerates the appearance of the second photosensitivity maximum, normally occuring on the 70th day of stratification.

Reinvestigation of apple-seed gibberellins

Re-investigation of the gibberellins in apple seed has established the presence of GA4 and GA7 and of traces of GA9 and the present results do not change the previous conclusions that during the stratification of apple seed the level of GA7 remains fairly constant while that ofGA4 increases.

17 References

Red Light Induction of Gibberellin Synthesis in Leaves

It is shown that gibberellins are synthesized during or very soon after the end of a period of red irradiation, which suggests that phytochrome in the Pfr form (after irradiation with red light) initiates synthesis, or at least brings about increases in the content of gibBerellin in plants and seeds.

Immediate Action of Phytochrome in Light-stimulated Lettuce Seeds

The escape time gives a physiological measure of the course of PFR action in the seed population, as shown in Fig. 1 for the authors' sample.

Phytochrome and hormonal control of expansion and greening of etiolated wheat leaves

Pre-treatment with ABA inhibits the increase in gibberellin levels in response to red light, but the ihibitory effect of ABA on unrolling cannot be ascribed only to its effect on gibBerellic acid levels.

Induction of fern spore germination.

Light-induced germination of Anemia spores can be inhibited by AMO-1618, a selective inhibitor of gibberellin biosynthesis, and Uptake of labeled gibb Berellin by spores in light is similar to that in darkness.

The Effect of Some Promoters and Inhibitors on the Light Controlled Germination of Strawberry Seeds; Fragaria vesca semperflorens Ehr.

Thio-urea induced a percentage of seeds to germinate in the dark, but the effect could not be correlated with the light effect, and the inhibitory effects of low levels of coumarin could be removed by increasing the quantity of red light given.

An enzymic site of inhibition of gibberellin biosynthesis by Amo 1618 and other plant growth retardants.

Evidence shows that an enzymic reaction resulting in the production of (-)-kaurene in a flowering plant system is inhibited in the presence of Amo 1618 or certain other plant growth retardants, which strongly supports the idea that (-)kauren19-ol is an intermediate in gibberellin biosynthesis.

Gibberellin Biosynthesis: Genetic Studies in Gibberella fujikuroi

Biochemical genetic studies on the production of gibberellins by the fungus Gibberella fujikuroi have identified two genes which control different steps in the biosynthetic pathway. One gene (g1)…

Studies on the biosynthesis of gibberellins from (−)-kaurenoic acid in cultures of Gibberella Fujikuroi

Biosynthesis of kaurene, squalene and phytoene from mevalonate-2-14C in a cell-free system from pea fruits

The effect of plant growth retardants on the biosynthesis of diterpenes by Gibberella fujikuroi