Micronutrient homeostasis and chloroplast iron protein expression is largely maintained in a chloroplast copper transporter mutant
Gretchen E. Kroh
A B and Marinus Pilon A
+ Author Affiliations
- Author Affiliations
A Biology Department, Colorado State University, 251 W. Pitkin Street, Fort Collins, CO 80523-1878, USA.
B Corresponding author. Email: gkroh@colostate.edu
Functional Plant Biology 47(12) 1041-1052 https://doi.org/10.1071/FP19374
Submitted: 21 December 2019 Accepted: 26 May 2020 Published: 23 June 2020
Abstract
PAAI is a P-Type ATPase that functions to import copper (Cu) into the chloroplast. Arabidopsis thaliana (L.) Heynh. paa1 mutants have lowered plastocyanin levels, resulting in a decreased photosynthetic electron transport rate. In nature, iron (Fe) and Cu homeostasis are often linked and it can be envisioned that paa1 acclimates its photosynthetic machinery by adjusting expression of its chloroplast Fe-proteome, but outside of Cu homeostasis paa1 has not been studied. Here, we characterise paa1 ultrastructure and accumulation of electron transport chain proteins in a paa1 allelic series. Furthermore, using hydroponic growth conditions, we characterised metal homeostasis in paa1 with an emphasis on the effects of Fe deficiency. Surprisingly, the paa1 mutation does not affect chloroplast ultrastructure or the accumulation of other photosynthetic electron transport chain proteins, despite the strong decrease in electron transport rate. The regulation of Fe-related photosynthetic electron transport proteins in response to Fe status was maintained in paa1, suggesting that regulation of the chloroplast Fe proteins ignores operational signals from photosynthetic output. The characterisation of paa1 has revealed new insight into the regulation of expression of the photosynthetic electron transport chain proteins and chloroplast metal homeostasis and can help to develop new strategies for the detection of shoot Fe deficiency.
Additional keywords: chloroplast, copper homeostasis, ferredoxin, iron homeostasis, photosynthesis, SufB.
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