Collection
Phytohormone Signaling in Plant Stress Physiology
Plant hormones are low molecular weight organic compounds, which occur in low concentrations and are produced by plants as secondary metabolites to regulate growth, development, reproduction, even death, and the adaptation to environmental stimuli. Five major classes of plant hormones have been known for a long time, including auxins, cytokinins, gibberellins, ethylene, and abscisic acid. Meanwhile, the list of classical hormones has been expanded to brassinosteroids, jasmonates, salicylic acid, and strigolactones. However, the definition of a plant hormone has not been clearly established. Further plant growth regulators, such as polyamines, can also be classified as plant hormones, depending on which hormone definition is considered.
In general, plant hormones can be divided into two groups depending on their role in the control of senescence. Ethylene, jasmonic acid, salicylic acid, and abscisic acid, and, to a minor extent, strigolactons have been characterized as hormones promoting senescence, while cytokinins, auxins, gibberellins, and brassinosteroids are regarded as hormones delaying senescence. Nevertheless, plant hormones do not exert their effects alone. They interact with each other in a complex network with versatile antagonistic and synergist connections which due to this fine-tuning lead to actual plant responses both under normal and stress conditions. Furthermore, their action and/or metabolism can be in relation to the synthesis of other protective or signaling compounds and hormones or hormone-like compounds, e.g., carotenoids, ethylene, gamma aminobutyric acid, glycine betaine, phytochelatins, flavonoid derivatives, proline, hydrogen peroxide, and nitric oxide.
Stress modulates almost all physiological, biochemical, and molecular processes in plants. Revealing the way of perception, new elements and cross-talking can help us to establish new models in the regulation of plant hormones.
This collection of articles focus on plant hormones and their signaling in plant stress physiology. Coverage includes research at the metabolite and gene expression levels which highlight changes in hormonal balance, newly discovered roles of plant hormones and hormone-like compounds, and their interactions with each other.
Editors
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Mohsin Tanveer
Mohsin Tanveer was born in Faisalabad, Pakistan. 2012-2014, Master in Agronomy, at University of Agriculture Faisalabad Pakistan. 2016-2020, PhD in Plant Physiology at University of Tasmania, Australia. Currently, he is working as associate professor Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, China. His research activity is currently focused on plant abiotic stress, nutrient metabolism and phytohormone signaling.
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Marino B. Arnao
Prof. M.B. Arnao was born in Spain. He gained his Ph.D. degree in Biology in 1990. Currently he is the Professor of Plant Physiology and lead scientist in phytohormones and plant development group at the University of Murcia. His research activity is currently focused on plant abiotic stress physiology and phytohormone signaling, melatonin biosynthesis and antioxidants.
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Lei Wang
Prof. Wang was born in 1980 in Linyi, Shandong. Shandong, China. 2003-2006, master’s degree in plant ecology from the Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences. 2006-2010, PhD in plant eco-physiology the Institute of Botany, Chinese Academy of Sciences. Since 2008, he has been associate professor and then professor at College of Life Sciences, Shanxi Agricultural University. His research activity is currently focused on plant abiotic stress physiology and ecology, heterogeneous seed biology, and seed germination ecology of desert plants.
