Inactivation of mitochondrial complex I stimulates chloroplast ATPase in Physcomitrium patens.
Journal
Plant physiology
ISSN: 1532-2548
Titre abrégé: Plant Physiol
Pays: United States
ID NLM: 0401224
Informations de publication
Date de publication:
05 10 2021
05 10 2021
Historique:
received:
07
12
2020
accepted:
18
05
2021
entrez:
5
10
2021
pubmed:
6
10
2021
medline:
1
3
2022
Statut:
ppublish
Résumé
Light is the ultimate source of energy for photosynthetic organisms, but respiration is fundamental for supporting metabolism during the night or in heterotrophic tissues. In this work, we isolated Physcomitrella (Physcomitrium patens) plants with altered respiration by inactivating Complex I (CI) of the mitochondrial electron transport chain by independently targeting on two essential subunits. Inactivation of CI caused a strong growth impairment even in fully autotrophic conditions in tissues where all cells are photosynthetically active, demonstrating that respiration is essential for photosynthesis. CI mutants showed alterations in the stoichiometry of respiratory complexes while the composition of photosynthetic apparatus was substantially unaffected. CI mutants showed altered photosynthesis with high activity of both Photosystems I and II, likely the result of high chloroplast ATPase activity that led to smaller ΔpH formation across thylakoid membranes, decreasing photosynthetic control on cytochrome b6f in CI mutants. These results demonstrate that alteration of respiratory activity directly impacts photosynthesis in P. patens and that metabolic interaction between organelles is essential in their ability to use light energy for growth.
Identifiants
pubmed: 34608952
pii: 6299409
doi: 10.1093/plphys/kiab276
pmc: PMC8491079
doi:
Substances chimiques
Chloroplast Proteins
0
Plant Proteins
0
Adenosine Triphosphatases
EC 3.6.1.-
Types de publication
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
931-946Informations de copyright
© American Society of Plant Biologists 2021. All rights reserved. For permissions, please email: journals.permissions@oup.com.
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