Special Issue "The Transition from Seed to Seedling"
Deadline for manuscript submissions: closed (20 May 2022) | Viewed by 4533
Interests: seed development; dormancy and germination; photosynthesis in developing seeds; seed desiccation tolerance; seed longevity
Seed germination represents a critical stage in plants’ life cycles. This process includes three important events—tissue hydration, the activation of metabolic activity, and the mobilization of reserve nutrients. The resumption of metabolic activity begins with the reactivation of enzymatic systems to repair the damages that inevitably accumulate in DNA, RNA, and proteins. Global metabolic rearrangements occurring in the seeds during germination lead to the initiation of radicle growth. At this moment, seeds lose their tolerance to desiccation and transit to post-germination stage and seedling development.
The resumption of vegetative development requires massive reprogramming of the transcriptome and attendant signaling pathways, resulting in the silencing of seed maturation genes and the activation of vegetative growth genes. The crucial hormonal signal is a balance between abscisic acid and gibberellins, but other hormones such as auxins, brassinosteroids, ethylene, cytokinins, and jasmonates are also involved. A network of transcription factors known as the LAFL as well as DOG1 are the negative regulators of seed germination. They should also be repressed before seedling development. This repression is associated with chromatin remodeling by Polycomb complexes, as well as the PICKLE proteins. Epigenetic modifications, including the methylation of DNA cytosine, histone modifications, and the post-transcriptional downregulation of seed maturation genes with miRNA, need to be discussed.
We invite contributions in the Special Issue from scientists who provide new insight into the mechanisms of genetic, epigenetic, and hormonal switches during the seed-to-seedling transition.
Dr. Galina Smolikova
Prof. Dr. Sergei Medvedev
Manuscript Submission Information
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- abscisic acid
- epigenetic modifications
- seed desiccation tolerance
- seedling establishment