Over-expression of a single Ca2+-dependent protein kinase confers both cold and salt/drought tolerance on rice plants.
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TL;DR: OsCDPK7 was shown to be a positive regulator commonly involved in the tolerance to both stresses in rice, and simple manipulation of CDPK activity has great potential with regard to plant improvement.
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Abstract: A rice gene encoding a calcium-dependent protein kinase (CDPK), OsCDPK7, was induced by cold and salt stresses. To elucidate the physiological function of OsCDPK7, we generated transgenic rice plants with altered levels of the protein. The extent of tolerance to cold and salt/drought stresses of these plants correlated well with the level of OsCDPK7 expression. Therefore, OsCDPK7 was shown to be a positive regulator commonly involved in the tolerance to both stresses in rice. Over-expression of OsCDPK7 enhanced induction of some stress-responsive genes in response to salinity/drought, but not to cold. Thus, it was suggested that the downstream pathways leading to the cold and salt/drought tolerance are different from each other. It seems likely that at least two distinct pathways commonly use a single CDPK, maintaining the signalling specificity through unknown post-translational regulation mechanisms. These results demonstrate that simple manipulation of CDPK activity has great potential with regard to plant improvement.
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References
Two genes that encode Ca(2+)-dependent protein kinases are induced by drought and high-salt stresses in Arabidopsis thaliana.
Takeshi Urao,Takeshi Katagiri,Tsuyoshi Mizoguchi,Kazuko Yamaguchi-Shinozaki,Nobuaki Hayashida,Kazuo Shinozaki +5 more
TL;DR: It is suggested that a change in the osmotic potential of the environment can serve as a trigger for the induction of ATCDPK1 and A TCDPK2.
Improving stress tolerance in plants by gene transfer
Niklas Holmberg,Leif Bülow +1 more
TL;DR: Key approaches currently being examined are engineered alterations in the amounts of osmolytes and osmoprotectants, saturation levels of membrane fatty acids, and rate of scavenging of reactive oxygen intermediates.
Saline culture of crops: a genetic approach.
Emanuel Epstein,J. D. Norlyn,Dale W. Rush,Ralph W. Kingsbury,David B. Kelley,Glen A. Cunningham,Anne F. Wrona +6 more
TL;DR: Genetic science offers the possibility of developing salt-tolerant crops, which, in conjunction with environmental manipulation, could improve agricultural production in saline regions and extend agriculture to previously unsuited regions.
Characterization of the gene for delta1-pyrroline-5-carboxylate synthetase and correlation between the expression of the gene and salt tolerance in Oryza sativa L.
Yumiko Igarashi,Yoshu Yoshiba,Yukika Sanada,Kazuko Yamaguchi-Shinozaki,Keishiro Wada,Kazuo Shinozaki +5 more
TL;DR: The gene for P5CS (OsP5CS) was induced by high salt, dehydration, treatment of ABA and cold treatment, while it was not induced by heat treatment, and accumulation of proline was observed as a result of high salt treatment in O. sativa.