Use of plant growth-promoting rhizobacteria to control stress responses of plant roots |
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Authors: | Bin Goo Kang Woo Taek Kim Hye Sup Yun Soo Chul Chang |
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Institution: | (1) ReSEAT Program, Korea Institute of Science and Technology Information, Seoul, 130-741, Korea;(2) Department of Biology, Yonsei University, Seoul, 120-749, Korea;(3) Department of Biological Sciences, Konkuk University, Seoul, 143-701, Korea;(4) University College, Yonsei University, Seoul, 120-749, Korea; |
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Abstract: | Ethylene is a key gaseous hormone that controls various physiological processes in plants including growth, senescence, fruit
ripening, and responses to abiotic and biotic stresses. In spite of some of these positive effects, the gas usually inhibits
plant growth. While chemical fertilizers help plants grow better by providing soil-limited nutrients such as nitrogen and
phosphate, over-usage often results in growth inhibition by soil contamination and subsequent stress responses in plants.
Therefore, controlling ethylene production in plants becomes one of the attractive challenges to increase crop yields. Some
soil bacteria among plant growth-promoting rhizobacteria (PGPRs) can stimulate plant growth even under stressful conditions
by reducing ethylene levels in plants, hence the term “stress controllers” for these bacteria. Thus, manipulation of relevant
genes or gene products might not only help clear polluted soil of contaminants but contribute to elevating the crop productivity.
In this article, the beneficial soil bacteria and the mechanisms of reduced ethylene production in plants by stress controllers
are discussed. |
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