Journal
NEW PHYTOLOGIST
Volume 212, Issue 1, Pages 36-41Publisher
WILEY-BLACKWELL
DOI: 10.1111/nph.14134
Keywords
abiotic stress; cellular degradation; chloroplast; photosynthesis; reactive oxygen species (ROS); signaling; ubiquitination
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Funding
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the US Department of Energy [DE-FG02-04ER15540]
- U.S. Department of Energy (DOE) [DE-FG02-04ER15540] Funding Source: U.S. Department of Energy (DOE)
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All organisms require the ability to sense their surroundings and adapt. Such capabilities allow them to thrive in a wide range of habitats. This is especially true for plants, which are sessile and have to be genetically equipped to withstand every change in their environment. Plants and other eukaryotes use their energy-producing organelles (i.e. mitochondria and chloroplasts) as such sensors. In response to a changing cellular or external environment, these organelles can emit retrograde' signals that alter gene expression and/or cell physiology. This signaling is important in plants, fungi, and animals and impacts diverse cellular functions including photosynthesis, energy production/storage, stress responses, growth, cell death, ageing, and tumor progression. Originally, chloroplast retrograde signals in plants were known to lead to the reprogramming of nuclear transcription. New research, however, has pointed to additional posttranslational mechanisms that lead to chloroplast regulation and turnover in response to stress. Such mechanisms involve singlet oxygen, ubiquitination, the 26S proteasome, and cellular degradation machinery.
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