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PLANT CELLULAR AND MOLECULAR RESPONSES TO HIGH SALINITY.
TLDR
Evidence for plant stress signaling systems is summarized, some of which have components analogous to those that regulate osmotic stress responses of yeast, some that presumably function in intercellular coordination or regulation of effector genes in a cell-/tissue-specific context required for tolerance of plants.
SIZ1-Mediated Sumoylation of ICE1 Controls CBF3/DREB1A Expression and Freezing Tolerance in Arabidopsis[W][OA]
TLDR
SIZ1-dependent sumoylation of ICE1 may activate and/or stabilize the protein, facilitating expression of CBF3/DREB1A and repression of MYB15, leading to low temperature tolerance.
The Arabidopsis SUMO E3 ligase SIZ1 controls phosphate deficiency responses.
TLDR
Results indicate that AtSIZ1 is a SUMO E3 ligase and that sumoylation is a control mechanism that acts both negatively and positively on different Pi deficiency responses.
Differential expression and function of Arabidopsis thaliana NHX Na+/H+ antiporters in the salt stress response.
TLDR
Together, these results implicate AtNHX2 and 5, together with At NHX1, as salt tolerance determinants, and indicate that AtNHx2 has a major function in vacuolar compartmentalization of Na+.
Dissection of floral induction pathways using global expression analysis
TLDR
A large group of potential floral repressors are discovered that are down-regulated upon photoperiodic induction, including two AP2 domain-encoding genes that can repress flowering and related findings on SPL genes suggest that microRNAs play an important role in the regulation of flowering.
Ion Homeostasis in NaCl Stress Environments
TLDR
This update will focus principally on Na+ homeostasis in sodic environments; however, discussions of H+, K+, Ca2+, and Cl will be included because of the interrelationship of these ions with Na+Homeostasis.
Salt Cress. A Halophyte and Cryophyte Arabidopsis Relative Model System and Its Applicability to Molecular Genetic Analyses of Growth and Development of Extremophiles1
TLDR
Several ethyl methanesulfonate mutants of salt cress that have reduced salinity tolerance are isolated, which provide evidence that salt tolerance in this halophyte can be significantly affected by individual genetic loci.
AtHKT1 is a salt tolerance determinant that controls Na+ entry into plant roots
TLDR
Results indicate that AtHKT1 is a salt tolerance determinant that controls Na+ entry and high affinity K+ uptake and revealed the existence of another Na+ influx system whose activity is reduced by high [Ca2+]ext.
Transgenic sorghum plants via microprojectile bombardment.
TLDR
These plants were resistant to local application of the herbicide Ignite/Basta, and the resistance was inherited in T1 plants as a single dominant locus.
The tomato gene Pti1 encodes a serine/threonine kinase that is phosphorylated by Pto and is involved in the hypersensitive response
TLDR
Findings indicate that Pti1 is involved in a Pto-mediated signaling pathway, probably by acting as a component downstream of Pto in a phosphorylation cascade.
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