1
|
Fan Y, Scafaro AP, Asao S, Furbank RT, Agostino A, Day DA, von Caemmerer S, Danila FR, Rug M, Webb D, Lee J, Atkin OK. Dark respiration rates are not determined by differences in mitochondrial capacity, abundance and ultrastructure in C 4 leaves. Plant Cell Environ 2022; 45:1257-1269. [PMID: 35048399 DOI: 10.1111/pce.14267] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 12/28/2021] [Indexed: 06/14/2023]
Abstract
Our understanding of the regulation of respiration in C4 plants, where mitochondria play different roles in the different types of C4 photosynthetic pathway, remains limited. We examined how leaf dark respiration rates (Rdark ), in the presence and absence of added malate, vary in monocots representing the three classical biochemical types of C4 photosynthesis (NADP-ME, NAD-ME and PCK) using intact leaves and extracted bundle sheath strands. In particular, we explored to what extent rates of Rdark are associated with mitochondrial number, volume and ultrastructure. Based on examination of a single species per C4 type, we found that the respiratory response of NAD-ME and PCK type bundle sheath strands to added malate was associated with differences in mitochondrial number, volume, and/or ultrastructure, while NADP-ME type bundle sheath strands did not respond to malate addition. In general, mitochondrial traits reflected the contributions mitochondria make to photosynthesis in the three C4 types. However, despite the obvious differences in mitochondrial traits, no clear correlation was observed between these traits and Rdark . We suggest that Rdark is primarily driven by cellular maintenance demands and not mitochondrial composition per se, in a manner that is somewhat independent of mitochondrial organic acid cycling in the light.
Collapse
Affiliation(s)
- Yuzhen Fan
- Research School of Biology, ARC Centre of Excellence in Plant Energy Biology, The Australian National University, Canberra, Australian Capital Territory, Australia
- Research School of Biology, Division of Plant Sciences, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Andrew P Scafaro
- Research School of Biology, ARC Centre of Excellence in Plant Energy Biology, The Australian National University, Canberra, Australian Capital Territory, Australia
- Research School of Biology, Division of Plant Sciences, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Shinichi Asao
- Research School of Biology, Division of Plant Sciences, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Robert T Furbank
- Research School of Biology, Division of Plant Sciences, The Australian National University, Canberra, Australian Capital Territory, Australia
- Research School of Biology, ARC Centre of Excellence for Translational Photosynthesis, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Antony Agostino
- Research School of Biology, Division of Plant Sciences, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - David A Day
- College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
| | - Susanne von Caemmerer
- Research School of Biology, Division of Plant Sciences, The Australian National University, Canberra, Australian Capital Territory, Australia
- Research School of Biology, ARC Centre of Excellence for Translational Photosynthesis, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Florence R Danila
- Research School of Biology, Division of Plant Sciences, The Australian National University, Canberra, Australian Capital Territory, Australia
- Research School of Biology, ARC Centre of Excellence for Translational Photosynthesis, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Melanie Rug
- Centre for Advanced Microscopy, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Daryl Webb
- Centre for Advanced Microscopy, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Jiwon Lee
- Centre for Advanced Microscopy, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Owen K Atkin
- Research School of Biology, ARC Centre of Excellence in Plant Energy Biology, The Australian National University, Canberra, Australian Capital Territory, Australia
- Research School of Biology, Division of Plant Sciences, The Australian National University, Canberra, Australian Capital Territory, Australia
| |
Collapse
|
2
|
Abstract
It is now over half a century since the biochemical characterization of the C4 photosynthetic pathway, and this special issue highlights the sheer breadth of current knowledge. New genomic and transcriptomic information shows that multi-level regulation of gene expression is required for the pathway to function, yet we know it to be one of the most dynamic examples of convergent evolution. Now, a focus on the molecular transition from C3-C4 intermediates, together with improved mathematical models, experimental tools and transformation systems, holds great promise for improving C4 photosynthesis in crops.
Collapse
Affiliation(s)
- Susanne von Caemmerer
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia
| | - Oula Ghannoum
- ARC Centre of Excellence for Translational Photosynthesis and Hawkesbury Institute for the Environment, Western Sydney University, Richmond NSW 2753, Australia
| | - Robert T Furbank
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia
| |
Collapse
|