Special Issue "Leaf Senescence"
Deadline for manuscript submissions: closed (15 October 2019).
Interests: senescence regulation; regulatory networks; transcription factors; oxidative stress and hydrogen peroxide as signaling molecule; leaf developmental memory
Senescence is the last step in leaf development and aims at remobilizing previously acquired nitrogen carbon and mineral resources out of the senescing tissue before the leaf eventually dies and is shed. Before anthesis, sequential leaf senescence leads to the repartitioning of nutrients from older leaves to newly developing non-reproductive organs. After anthesis, monocarpic leaf senescence governs nutrient reallocation to the now developing reproductive organs and, therefore, has a very critical impact on yield. In the last two decades, it has become obvious that no “master regulator” for senescence exists, but an extremely complex regulatory network controls all aspects of senescence. Leaf and plant age are the predominant parameters controlling the onset and progression of senescence; however, incoming environmental signals are constantly integrated and have the potential to induce senescence prematurely. Premature senescence serves as an exit strategy to produce offspring when biotic or abiotic stress generates long-term unfavorable conditions for the plant. However, premature senescence often correlates with diminished seed quantity and quality and has therefore high influence on productivity and yield in crop plants.
Multi-layer feedback regulatory cues are in place to control senescence, and transcriptional, post-transcriptional, post-translational regulatory mechanisms can act in concert for a single gene. Moreover, we are just beginning to understand the dynamic changes in chromatin structure and nuclear architecture during senescence. Alternative splicing and polyadenylation events have rarely been analyzed. Therefore, this Special Issue aims at collecting a wide range of different articles (original research papers, perspectives, hypotheses, opinions, reviews, modeling approaches, and methods) that focus on leaf senescence and its regulation at all levels, including biochemistry, physiology, genes, RNAs, proteins, metabolites, nutrition, and environment, in model or crop plants. In addition, comparisons of leaf senescence to senescnece processes in other plant organs or evolutionary aspects of senescence are most welcome.
Prof. Dr. Ulrike Zentgraf
Manuscript Submission Information
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- kinetics of leaf senescence
- sequential versus monocarpic senescence
- ROS and phytohormone signaling
- transcriptional networks
- role of cellular compartments
- nutrient repartitioning
- alternative splicing and polyadenylation events