Light effects on endogenous levels of gibberellins in photoblastic lettuce seeds

@article{Toyomasu2004LightEO,
  title={Light effects on endogenous levels of gibberellins in photoblastic lettuce seeds},
  author={Tomonobu Toyomasu and Hiroko Tsuji and Hisakazu Yamane and Masayoshi Nakayama and Isomaro Yamaguchi and Noboru Murofushi and Nobutaka Takahashi and Yasunori Inoue},
  journal={Journal of Plant Growth Regulation},
  year={2004},
  volume={12},
  pages={85-90}
}
Gibberellin A1 (GA1), 3-epi-GA1 GA17, GA19, GA20, and GA77 were identified by Kovats retention indices and full-scan mass spectra from gas chromatography-mass spectrometry analysis of a purified extract of mature seeds of photoblastic lettuce (Lactuca sativa L. cv. Grand Rapids). Non-13-hydroxylated GAs such as GA4 and GA9 were not detected even by highly sensitive radioimmunoassay. These results show that the major biosynthetic pathway of GAs in lettuce seeds is the early-13-hydroxylation… 

Deactivation of Gibberellin by 2-Oxidation during Germination of Photoblastic Lettuce Seeds

Gibberellin (GA) plays an important role in the induction of germination of photoblastic lettuce (Lactuca sativa L. cv. Grand Rapids) seeds. We have previously shown that gene expression of a GA

Effect of light on endogenous levels of gibberellin and abscisic acid in seed germination of photoblastic weedy rice (Oryza sativa L.)

Results showed that the major biosynthetic pathway of GAs in PBWR seeds is the early 13-hydroxylation pathway leading to GA1, which was suggested to be physiologically active in the PBWR seed germination.

Phytochrome inhibits the effectiveness of gibberellins to induce cell elongation in rice

The data indicate that phytochrome regulates the sensitivity of the tissue towards gibberellins, that gibBerellin synthesis is controlled in a negative-feedback loop dependent on gibb Berellin effectiveness, and that at least two hormone-triggered signal chains are linked to the cytoskeleton in rice.

Phytochrome inhibits the effectiveness of gibberellins to induce cell elongation in rice

Red light controls cell elongation in seedlings of rice (Oryza sativa L.) in a far-red-reversible manner (Nick and Furuya, 1993, Plant Growth Regul. 12, 195–206). The role of gibberellins and

Phytochrome- and Gibberellin-Mediated Regulation of Abscisic Acid Metabolism during Germination of Photoblastic Lettuce Seeds1[OA]

Quantitative reverse transcription-polymerase chain reaction analysis indicated that ABA levels are controlled by phytochrome through down-regulation of LsNCED2 and Ls NCED4 expression and up-regulationof LsABA8ox4 expression in lettuce seeds, indicating that phy tochrome regulation of ABA metabolism is mediated by both GA-dependent and -independent mechanisms.

Abscisic acid in the thermoinhibition of lettuce seed germination and enhancement of its catabolism by gibberellin.

It is concluded that ABA is an important factor in the regulation of thermoinhibition of lettuce seed germination, and that GA affects the temperature responsiveness of the seeds through ABA metabolism.

The Involvement of Gibberellin 20-Oxidase Genes in Phytochrome-Regulated Petiole Elongation of Arabidopsis

It is shown that enhancement of petiole elongation by a far-red (FR)-rich LD is mimicked by a brief end-of-day (EOD) FR exposure in short day (SD), and Circadian entrainment to a daytime pattern provides an explanation for the SD expression of AtGA20ox1.

Light Regulation of Gibberellins Metabolism in Seedling Development

This short article attempts to examine some recent developments in the understanding of how light and photoreceptors regulate GA biosynthesis and catabolism during seedling development.

Gene expression analysis of light-modulated germination in tomato seeds.

A global transcript analysis of seeds subjected to FRc inhibitory treatment, with and without a subsequent red light pulse, identified different groups of genes associated with dormancy maintenance, inhibition and promotion of germination and showed that ELIP, CSN6, SOS2 and RBP are related to the photocontrol of Germination.

Germination of photoblastic lettuce seeds is regulated via the control of endogenous physiologically active gibberellin content, rather than of gibberellin responsiveness

Lettuce seeds in which de novo GA biosynthesis was suppressed responded almost identically to exogenously applied GA, irrespective of the light conditions, suggesting that GA responsiveness is not significantly affected by light in lettuce seeds.
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