Author
Marcel A. K. Jansen
Other affiliations: National University of Ireland, John Innes Centre, University of Antwerp ...read more
Bio: Marcel A. K. Jansen is an academic researcher from University College Cork. The author has contributed to research in topics: Medicine & Lemna minor. The author has an hindex of 43, co-authored 137 publications receiving 7397 citations. Previous affiliations of Marcel A. K. Jansen include National University of Ireland & John Innes Centre.
Papers published on a yearly basis
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TL;DR: A future challenge is to elucidate how UV-B-exposed plants balance damage, repair, acclimation and adaptation responses in a photobiologically dynamic environment.
968 citations
TL;DR: The stress-induced morphogenic response (SIMR) is postulated to be part of a general acclimation strategy, whereby plant growth is redirected to diminish stress exposure.
667 citations
TL;DR: It is hypothesized that low UV-B doses cause 'eustress' (good stress) and that stimuli-specific signaling pathways pre-dispose plants to a state of low alert that includes activation of antioxidant defenses.
491 citations
TL;DR: It is speculated that stress-induced modulation of plant growth is mediated by a plethora of molecular interactions, whereby different environmental signals can trigger similar morphogenic responses, and can be viewed in terms of a thermodynamic model.
Abstract: Exposure of plants to mild chronic stress can cause induction of specific, stress-induced morphogenic responses (SIMRs). These responses are characterized by a blockage of cell division in the main meristematic tissues, an inhibition of elongation and a redirected outgrowth of lateral organs. Key elements in the ontogenesis of this phenotype appear to be stress-affected gradients of reactive oxygen species (ROS), antioxidants, auxin and ethylene. These gradients are present at the the organismal level, but are integrated on the cellular level, affecting cell division, cell elongation and/or cell differentiation. Our analysis of the literature indicates that stress-induced modulation of plant growth is mediated by a plethora of molecular interactions, whereby different environmental signals can trigger similar morphogenic responses. At least some of the molecular interactions that underlie morphogenic responses appear to be interchangeable. We speculate that this complexity can be viewed in terms of a thermodynamic model, in which not the specific pathway, but the achieved metabolic state is biologically conserved.
324 citations
TL;DR: The possibility that some UV-B driven morphogenic responses do not involve a dedicated photosensory system, but rather are a consequence ofUV-B induced changes in secondary metabolism is discussed.
Abstract: Plants raised under field conditions are acclimated to ambient levels of solar UV-B radiation Morphogenic responses are part of the UV-B acclimation process and have been hypothesized to contribute to UV avoidance UV-B induced morphogenic responses include inhibition of hypocotyl and stem elongation, leaf curling, leaf thickening and increased axillary branching So far, neither the photosensory nor the signal transduction mechanism involved in UV-B mediated morphogenesis has been identified The combination of classical photobiological techniques and Arabidopsis genetic resources comprises a powerful tool for the analysis of morphogenic responses However, no morphogenic mutants, specifically altered in their response to UV-B, have yet been identified In this paper we discuss the possibility that some UV-B driven morphogenic responses do not involve a dedicated photosensory system, but rather are a consequence of UV-B induced changes in secondary metabolism UV-B induced flavonoid aglycones and phenol-oxidizing peroxidases can affect, respectively, polar auxin transport and auxin catabolism, and hence plant architecture Integration of genetic, photobiological, biochemical and physiological approaches is necessary to fully appraise the ecophysiological role of UV-B radiation in controlling plant architecture
255 citations
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TL;DR: The biochemistry of ROS and their production sites, and ROS scavenging antioxidant defense machinery are described, which protects plants against oxidative stress damages.
8,259 citations
TL;DR: The structural features of flavonoids, their beneficial roles in human health, and significance in plants as well as their microbial production are highlighted.
Abstract: There has been increasing interest in the research on flavonoids from plant sources because of their versatile health benefits reported in various epidemiological studies. Since flavonoids are directly associated with human dietary ingredients and health, there is need to evaluate structure and function relationship. The bioavailability, metabolism, and biological activity of flavonoids depend upon the configuration, total number of hydroxyl groups, and substitution of functional groups about their nuclear structure. Fruits and vegetables are the main dietary sources of flavonoids for humans, along with tea and wine. Most recent researches have focused on the health aspects of flavonoids for humans. Many flavonoids are shown to have antioxidative activity, free radical scavenging capacity, coronary heart disease prevention, hepatoprotective, anti-inflammatory, and anticancer activities, while some flavonoids exhibit potential antiviral activities. In plant systems, flavonoids help in combating oxidative stress and act as growth regulators. For pharmaceutical purposes cost-effective bulk production of different types of flavonoids has been made possible with the help of microbial biotechnology. This review highlights the structural features of flavonoids, their beneficial roles in human health, and significance in plants as well as their microbial production.
3,107 citations
01 Jan 1992
TL;DR: Prospects for Stress Tolerance through Genetic Engineering of SOD and MnSOD Overexpression are surveyed, and the Mechanism of Sod Regulation is studied.
Abstract: OXIDATIVE STRESS . . . . . . . . . . . . . .. . . . . .... . . . . .. . . . . .. . . . ... .. . . . . .... . . .. .. . . . . . ... . 84 RESPONSE OF SOD TO ENVIRONMENTAL STRESS . . . . . . . . . . . . . . . .. . . . .... . . .... . . . . . . 87 Photoinhibition . . . . . . . . . . .. . ... . . .. . . . .. . . . . ..... . . . , ... ", , ... ,' , ... . ,., . . . "" . .. . ,'.' . . ,' . . . . , ., 87 Paraquat and Other Herbicides . . .. , . . .... , ..... , . . . . ... . . . .. . . . . . . . . . . . . ,.. 91 Atmospheric Pollutants . . " .... , .... , " .... " , , . . , .... , ' 94 Waterlogging and Drought .. ", . . ... , . . . . . . , .. "", . . ", . . . . . ", . . . .. ", . . .. , . . . ... """", . . " 97 The Defense Response to Pathogens . ... . . . . "" ... "" .... " ...... " ,."" .... . , 98 The Phenomenon of Cross-Tolerance . . . , , .. . . . . ...... . . , . . . . . . , . . .... , .. . . . . . . . .. .. 101 The Mechanism of SOD Regulation ........ , , ...... , " 102 GENETIC ENGINEERING OF SOD IN PLANTS .. ' ...... ' . . . . . . . . . . . . . . . . . . . . . . . .. . . . , .... ' 104 Cu/ZnSOD and MnSOD Overexpression . . . . . .. . . . . . , . . . . . . .. . . . . . .. . . . . . , .... . . . . .. . . ,.... . . 105 Prospects for Stress Tolerance through Genetic Engineering of SOD . . . . ,,, .. , . . . . . . . 106
2,603 citations
TL;DR: This review will attempt to address several key questions related to the use of ROS as signaling molecules in cells, including the dynamics and specificity of ROS signaling, networking of ROS with other signaling pathways, ROS signaling within and across different cells, ROS waves and the evolution of the ROS gene network.
1,879 citations