2024-03-29T14:05:04Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1900682021-12-28T15:45:10Zcom_10261_80com_10261_1col_10261_333
DIGITAL.CSIC
author
Ojeda, Valle
author
Nájera, Victoria A.
author
González, Maricruz
author
Pérez-Ruiz, Juan Manuel
author
Cejudo, Francisco Javier
funder
Ministerio de Economía y Competitividad (España)
funder
European Commission
funder
Junta de Andalucía
2019-09-06T09:53:22Z
2019-09-06T09:53:22Z
2017-09-21
Plant Signaling and Behavior 12(9): e1347244 (2017)
1559-2316
http://hdl.handle.net/10261/190068
10.1080/15592324.2017.1347244
1559-2324
http://dx.doi.org/10.13039/501100003329http://dx.doi.org/10.13039/501100000780http://dx.doi.org/10.13039/501100011011
28692378
Thioredoxins (Trxs) play a relevant role in thiol-dependent redox regulation, which allows the rapid adaptation of chloroplast metabolism to unpredictable environmental conditions. In chloroplasts, Trxs use reducing equivalents provided by photoreduced ferredoxin (Fdx) via the action of a ferredoxin-thioredoxin reductase (FTR), thus linking redox regulation to light. In addition, these organelles contain an NADPH-thioredoxin reductase, NTRC, with a Trx domain at the C-terminus. NTRC efficiently reduces 2-Cys peroxiredoxins (Prxs), hence having antioxidant function. However, NTRC also participates in the redox regulation of processes, such as starch and chlorophyll biosynthesis, which are known to be regulated by Trxs. Thus, the question arising is whether there is a cross-talk between the 2 redox systems. Arabidopsis mutants simultaneously devoid of NTRC and Trx x or Trxs f show a dramatic growth inhibition phenotype, indicating that NTRC is required for the function of these unrelated Trxs. Remarkably, both the ntrc-trxx double mutant and, to a higher extent, the ntrc-trxf1f2 triple mutant show high mortality at the seedling stage, which is rescued by sucrose. These findings show the relevant role of redox regulation for chloroplast performance and uncover the key function of cotyledons chloroplasts at the transition to autotrophic metabolism during seedling establishment.
eng
openAccess
Thioredoxin
Seedling
Redox regulation
NTRC
Chloroplast
Photosynthetic activity of cotyledons is critical during post germinative growth and seedling establishment
artículo
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URL
https://digital.csic.es/bitstream/10261/190068/1/photosynthetic_activity_cotyledons_critical.pdf
File
MD5
d625bb659965e78f3fb16417e525fa55
1229265
application/pdf
photosynthetic_activity_cotyledons_critical.pdf