美国科学家通过研究发现了在缺少水分或者盐分的情况下，植物如何将压力信号从叶绿体传递到细胞核。
美国内华达州大学里诺分校的副教授Ron Mittler和研究员Shai Koussevitzky发现：植物的多个遇难信号最后都集中到一个路径中，并通过它传递到细胞核。Mittler和Koussevitzky发现：使得植物呈现绿色的细胞器——叶绿体至少有三种不同的信号能够表明植物处于压力中。
研究人员表示：考虑到未来植物可能由于全球变暖而遭受环境挑战，该项新发现可能会导致产生更耐旱、更抗压力的植物。
该项研究结果发表在《科学》杂志上。
原始出处：
http://www.sciencedaily.com/upi/index.php?feed=Science&article=UPI-1-20070403-14054500-bc-us-plants.xml
部分英文原文：
Published Online March 29, 2007
Science DOI: 10.1126/science. 1140516
Research Articles
Submitted on January 29, 2007
Accepted on March 14, 2007
Multiple Signals from Damaged Chloroplasts Converge on a Common Pathway to Regulate Nuclear Gene Expression
Shai Koussevitzky 1, Ajit Nott 2, Todd C. Mockler 3, Fangxin Hong 4, Gilberto Sachetto-Martins 5, Marci Surpin 6, Jason Lim 7, Ron Mittler 8, Joanne Chory 7*
1 Howard Hughes Medical Institute; Plant Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA; Department of Biochemistry and Molecular Biology, University of Nevada, Mail Stop 200, Reno, NV 89557, USA.
2 Howard Hughes Medical Institute; Plant Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
3 Plant Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA; Present address: Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331, USA.
4 Howard Hughes Medical Institute, 2Plant Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA; Present address: Department of Biostatistics, Division of Information Sciences, City of Hope National Medical Center and Beckman Research Institute, 1500 Duarte Rd, Duarte, CA 91010, USA.
5 Plant Biology Laboratory, The Salk Institute for Biological Studies; Present address: Departamento de Genética, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Caixa Postal 68011, 21941-970, Brazil.
6 Plant Biology Laboratory, The Salk Institute for Biological Studies, Present address: Center for Plant Cell Biology, Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA.
7 Howard Hughes Medical Institute, 2Plant Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
8 Department of Biochemistry and Molecular Biology, University of Nevada, Mail Stop 200, Reno, NV 89557, USA.
* To whom correspondence should be addressed.
Joanne Chory , E-mail: chory@salk.edu
Plastid-to-nucleus retrograde signaling coordinates nuclear gene expression with chloroplast function and is essential for the photoautotrophic life-style of plants. Three retrograde signals have been described, but little is known of their signaling pathways. We show here that GUN1, a chloroplast localized pentatricopeptide-repeat protein and ABI4, an AP2-type transcription factor, are common to all three pathways. ABI4 binds the promoter of a retrograde-regulated gene through a conserved motif found in close proximity to a light-regulatory element. We propose a model in which multiple indicators of aberrant plastid function are integrated upstream of GUN1 within plastids, leading to ABI4-mediated repression of nuclear-encoded genes.
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