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Light is the main source of energy for the primary process that sustains life on our planet, known as photosynthesis. Photosynthesis is the strategy adopted by many living organisms for capturing and incorporating energy, and it is under this context that light is primarily experienced, explored, and exploited. Plants perceive information from the ambient environment and communicate with other organisms using light. They have developed a plethora of photoreceptors that permit this communication with the surrounding environment. Additionally, the physical properties of light, such as the spectral quality, irradiance, intensity, and photoperiod, play an integral role in the morphogenesis, growth, and metabolism of many biochemical pathways in plants. To facilitate photosynthesis in controlled environments, light-emitting diodes (LEDs) have been shown to offer interesting prospects for use in plant lighting designs in controlled-environment agriculture (greenhouses) and growth chambers for in vitro cultures. In high-technology greenhouses (for instance, vertical agriculture), artificial light may assume both assimilative (optimizing photosynthetic efficiency) and control functionality (guiding growth and development or the synthesis and accumulation of plant metabolites). In vitro cultures are regulated by different factors, and among them, light is the most important.

Growth (Plants) --- Plant growth --- Plants --- Growth --- Plant physiology --- Meristems --- Plant growth-promoting rhizobacteria --- Rejuvenescence (Botany) --- Development

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

biological nitrogen fixation --- mycorrhizal symbiosis --- plant growth promoting rhizobacteria --- plant nutrition --- root microbiome

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With the continuous decline of the area under cultivation and the increase in human population, one of the major challenges is to increase crop productivity to feed everyone. A major part of crop loss is attributed to different types of plant stresses (both biotic and abiotic). Hence by managing these stresses, we may increase the global production to ensure food security. Different approaches have been adopted in the recent past to reduce crop loss due to plant stress, but some of them like use of agrochemicals had significant ecological concerns. Thus, it was desired to protect the crop plants from different types of plant stresses in an eco-friendly, and environmentally sustainable manner.In the natural environment, the plants are closely associated with the soil microbes. Some of them are already known to pro mote promote plant growth to a considerable extent. Several researchers have demonstrated that the inoculation of PGPR (Plant Growth-Promoting Rhizobacteria) is not only effective to enhance plant growth but also their tolerance towards different types plant stresses. Therefore, they have the capability to increase the plant growth even under the stressful environments. The present book therefore, is an up-to-date compilation of the role of PGPR in plant stress management in the form of 13 edited chapters, written by renowned researchers and academicians. The book deals with the different aspects of PGPR from their isolation, characterization, mechanisms of stress alleviation, and commercialization etc. Different mechanisms of different PGPR, their combinations with other soil micro- and macro-organism for an effective plant stress management have also been discussed. Overall this book is a whole-some package to describe stress management roles of PGPR reported till date.

Plant growth-promoting rhizobacteria. --- Plants --- Plant-microbe relationships. --- Effect of stress on.

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Abiotic stress includes not only single adversities, i.e., drought, salt, temperature, and elevated CO2, but also complex stresses, i.e., saline and alkali soil, and karst environment. Abiotic stresses strongly affect many aspects of a plant's substance and energy metabolism. Meanwhile, abiotic stress not only affects the physiological processes of photosynthesis, water metabolism, and inorganic nutrient absorption, but it also influences the electrophysiology and other physical parameters of plants. Plant physiological information, especially online physiological information, helps us to understand the plant's adaptive mechanism and take the effective measures to improve the production of horticultural plants. This Special Issue contains a collection of 11 important research works, which deepen the connotation and expand the denotation of plant physiology under abiotic stress. These works will provide a theoretical basis for the production of horticultural crops under single stresses, such as drought and salt stress, or under complex stresses, such as saline and alkali and karst environments. Readers from all over the globe are expected to greatly benefit from this Special Issue collection both in terms of their own work and to improve the productivity of horticultural crops under complex abiotic stresses. In the future, we hope that the field of plant (horticultural crop) physiology under abiotic stresses flourishes in terms of academic research and publications.

Plant physiology. --- Growth (Plants) --- Plant growth --- Plants --- Growth --- Plant physiology --- Meristems --- Plant growth-promoting rhizobacteria --- Rejuvenescence (Botany) --- Botany --- Physiology --- Development

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Plant growth-promoting rhizobacteria. --- Plant-microbe relationships. --- Potash industry and trade. --- Rhizobiaceae. --- Botany --- Earth & Environmental Sciences --- Plant Physiology