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Recently, Liu Xuncheng, a researcher at the South China Botanical Garden of the Chinese Academy of Sciences, made new progress in the study of molecular mechanisms of the germination of light regulatory seeds, and the relevant research paper identification of HDA15-PIF1 as a key repression module directing transcription network of seed germination in the dark was published online in the international academic journal Nucleic Acids Research.
1952, Borthwick and Hendricks of the Beltsville Agricultural Research Center in the United States treated datel seeds with monochrome light, and found that red light promoted the germination of dates seeds, while far red light exposure reversed the process.
based on this discovery, the researchers successfully identified and isolated the first type of photoresum receptor from plants, photosensitive pigments that sense red and far red light, opening a new chapter in the study of plant light signals.
In the germinated seeds, photosensitive pigments are synthesized as physiological inactive (Pr) and, under red light (or strong natural light), are converted into physiologically active (Pfr), inducing a series of gene transcription and metabolic reactions within the seeds to initiate the seed germination process.
, however, the mechanism of how photosensitive pigment finely regulates downstream gene transcription networks needs further study.
team identified a key inhibitor involved in photomodulation seed germination, histone deacetylase HDA15, using model plant amoeba as a research material.
genetic analysis found that mutations in the Amoeba gene promote photosensitive pigment B (PHYB)-mediated seed germination, while excessive expression of the HDA15 gene inhibited this process;
Bio-biogenic and transcription network analysis showed that under far red light (or weak natural light), HDA15-PIF1 protein interoperability occurred in the seed, forming an important transcriptional suppression module, which together inhibited the expression of 267 genes closely related to germination, including erythromycin and growth hormone signals, as well as cell wall hydrolysing.
Further studies have shown that the HDA15-PIF1 module reduces the transcriptional activity and expression of germination-related genes through histoprotein deacetylization, thereby inhibiting the onset of seed germination;
the study revealed an important gene transcription regulatory module in the pathway of seed germination mediated by HDA15-PIF1 as photosensitive pigment.
In adverse growth conditions such as darkness, plant seeds inhibit gene transcription through the module to maintain sleep, while when the sun-abundant temperature rises, the module automatically disarms and the plants germinate and grow normally.
research results will provide new ideas and theoretical guidance for molecular breeding design to improve the germination rate of crop seeds.
the study was supported by projects such as the Chinese Academy of Sciences Youth Innovation Promotion Association, the National Natural Science Foundation of China and the Guangdong Natural Science Foundation.
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