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Light-dependent regulation of the jasmonate pathway

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Abstract

Jasmonates (JAs) are plant hormones which are crucial for the response of plants to several biotic and abiotic stresses. Beside this important function, they are involved in several developmental processes throughout plant life. In this short review, we would like to summarize the recent findings about the function of JAs in photomorphogenesis with a main focus on the model plant rice. Early plant development is determined to a large extent by light. Depending on whether seedlings are raised in darkness or in light, they show a completely different appearance which led to the terms skoto- and photomorphogenesis, respectively. The different appearance depending on the light conditions has been used to screen for mutants in photoperception and signalling. By this approach, mutants for several photoreceptors and in the downstream signalling pathways could be isolated. In rice, we and others isolated mutants with a very intriguing phenotype. The mutated genes have been cloned by map-based cloning, and all of them encode for JA biosynthesis genes. The most bioactive form of JAs identified so far is the amino acid conjugate jasmonoyl-isoleucin (JA-Ile). In order to conjugate JA to Ile, an enzyme of the GH3 family, JASMONATE RESISTANT 1, is required. We characterized mutants of OsJAR1 on a physiological and biochemical level and found evidence for redundantly active enzymes in rice.

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Acknowledgments

K.S. was supported by a scholarship from the Landesgraduiertenförderungsgesetz from the state of Baden-Württemberg and from the Studienstiftung des Deutschen Volkes. M.R. obtained funding from the Japanese Society for the Promotion of Science and the Alexander von Humboldt Foundation. Both authors thank Michael Rühle (Karlsruhe Institute of Technology) for the design of Figs. 1 and 2.

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  1. Botanical Institute, Molecular Cell Biology, Karlsruhe Institute of Technology, Kaiserstr. 2, 76128, Karlsruhe, Germany

    Katharina Svyatyna & Michael Riemann

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  1. Katharina Svyatyna
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Svyatyna, K., Riemann, M. Light-dependent regulation of the jasmonate pathway. Protoplasma 249 (Suppl 2), 137–145 (2012). https://doi.org/10.1007/s00709-012-0409-3

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