Morphogenic effects of abiotic stress: reorientation of growth in Arabidopsis thaliana seedlings |
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| Affiliation: | 1. Institute of Cell Biology and Genetic Engineering Natl. Acad. Sci. of Ukraine, Zabolotnogo Str. 148, U-03650 Kiev, Ukraine;2. Laboratory for Plant Physiology, Department of Biology, University of Antwerp, Groenenborgerlaan 171, B 2020 Antwerp, Belgium;3. Department of Plant Sciences (ZEPS), University College Cork, Butler Building, Distillery Field, North Mall, Cork, Ireland;1. Higher Polytechnic School and Experimental Science College, Department of Agronomy of the University of Almeria, Agrifood Campus of International Excellence ceiA3. Ctra. Sacramento s/n, La Cañada de San Urbano, 04120 Almería, Spain;2. Universidade do Algarve, MeditBio, FCT, Edifício 8, Campus de Gambelas, 8005-139 Faro, Portugal;1. Department of Basic Medical Sciences, Medical College, Xiamen University, Xiamen, China;2. Department of Cardiology, Zhongshan Hospital, Xiamen, China;1. Núcleo de Investigación en Producción Alimentaría (NIPA-UCT), Facultad de Recursos Naturales, Universidad Católica de Temuco, P.O. Box 56-D, Temuco, Chile;2. Escuela de Agronomía, Facultad de Recursos Naturales, Universidad Católica de Temuco, P.O. Box 56-D, Temuco, Chile;3. Departamento de Ciencias Físicas, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, P.O. Box 54-D, Temuco, Chile;4. Center for Optics and Photonics, Universidad de Concepción, Casilla 4012, Concepción, Chile;5. Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, P.O. Box 114-D, Santiago, Chile;6. Departamento de Ciencias Químicas y Recursos Naturales, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, P.O. Box 54-D, Temuco, Chile;7. Center of Plant, Soil Interaction and Natural Resources Biotechnology, Scientific and Technological Bioresource Nucleus (BIOREN), Universidad de La Frontera, P.O. Box 54-D, Temuco, Chile;1. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan;2. Department of Life Science, National Tsing Hua University, Hsinchu 300, Taiwan;1. Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, Campus Lagoas-Marcosende s/n, 36310 Vigo, Spain;2. Department of Organic Chemistry, Faculty of Chemistry, University of Vigo, Campus Lagoas-Marcosende s/n, 36310 Vigo, Spain;3. Instituto de Investigación Sanitaria Galicia Sur (IISGS), Universidade de Vigo, 36310 Vigo, Spain |
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| Abstract: | Abiotic stress responses include changes in physiological and biochemical processes as well as morphological and developmental patterns. It has remained an enigma which mechanisms are responsible for stress-induced morphogenesis. In this paper we demonstrate that stress induced phenotypes comprise a re-orientation rather than a cessation of growth. Moreover, strong similarities between the phenotypes induced by excess copper, paraquat, salicylic acid and a hydrogen peroxide analogue, indicate that a common molecular-physiological response system mediates these morphogenic stress responses. It is proposed that reactive oxygen species play a key role in controlling the architectural changes in stressed Arabidopsis thaliana seedlings.We found that phenotypes of plants exposed to stress resemble, in terms of the redistribution of growth, plants altered in phytohormone metabolism. We also found that plants in which polar auxin transport is blocked with TIBA, strongly resemble, but are not identical to, plants exposed to abiotic stress. Based on the stress induced formation of lateral roots, we surmise that stress induces local auxin accumulation near the root pericycle. |
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