The stress kinase gene MtSK1 in Medicago truncatula with particular reference to somatic embryogenesis

Plant Cell Reports
Kim E NolanRay J Rose

Abstract

Medicago truncatula, a model for legume genomics, can be regenerated by somatic embryogensis by the use of a suitable genotype and an auxin plus cytokinin. The stress response induced by explant wounding and culture is increasingly recognized as an important component of somatic embryo induction. We have cloned and investigated the stress kinase gene MtSK1 in relation to somatic embryogenesis in M. truncatula, using the highly embryogenic mutant Jemalong 2HA (2HA) and its progenitor Jemalong. The main features of the MtSK1 protein of 351 amino acids are an N-terminal kinase domain and a C-terminal glutamic acid-rich region, which is predicted to be a coiled-coil. MtSK1 is a member of the SnRK2 subgroup of the SnRK group of plant kinases. Members of the SnRK2 kinases play a role in stress responses of plants. MtSKI expression is induced by wounding in the cultured tissue independent of auxin or cytokinin. However, in both 2HA and Jemalong, as the callus develops in response to auxin plus cytokinin, MtSK1 expression continues to increase. MtSK1 responds to salt stress in vivo, consistent with its role as a stress kinase. The likely role of MtSK1 in stress-induced signaling will facilitate the relating of stress-response pathways ...Continue Reading

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Citations

Sep 19, 2009·Journal of Chemical Biology·Omid KaramiAghil Mahmoudi Pour
Dec 6, 2011·Omics : a Journal of Integrative Biology·Anna KulikGrażyna Dobrowolska
May 1, 2013·Journal of Experimental Botany·Shanjun TianRuilian Jing
Dec 4, 2012·International Journal of Molecular Sciences·Lei TaoXiangling You
Oct 24, 2013·Plant & Cell Physiology·Mika Hayashi-TsuganeMasahiko Maekawa
Mar 15, 2016·Journal of Plant Physiology·Katarzyna Nowak, Małgorzata D Gaj
Apr 24, 2012·Physiologia Plantarum·Yasunari FujitaKazuko Yamaguchi-Shinozaki
Sep 9, 2015·Frontiers in Plant Science·Clelia De-la-PeñaVíctor M Loyola-Vargas
Sep 14, 2016·Journal of Experimental Botany·Jian-Mei LongWen-Wu Guo
Aug 26, 2009·Molecular Biology Reports·Omid Karami, Abbas Saidi

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