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Title: A limited role for carbonic anhydrase in C4 photosynthesis as revealed by a ca1ca2 double mutant in maize.

Journal Article · · Plant Physiology (Bethesda)
 [1];  [2];  [1];  [1];  [2];  [1]
  1. Donald Danforth Plant Science Center, St. Louis, MO (United States)
  2. Washington State Univ., Pullman, WA (United States)

Carbonic anhydrase (CA) catalyzes the first biochemical step of the carbon concentrating mechanism of C4 plants, and in C4 monocots, it has been suggested that CA activity is near limiting for photosynthesis. Here, we test this hypothesis through the characterization of transposon induced mutant alleles of Ca1 and Ca2 in Zea mays. In addition, these two isoforms account for more than 85% of the CA transcript pool. A significant change in isotopic discrimination is observed in mutant plants, which have as little as 3% of wild-type CA activity, but surprisingly, photosynthesis is not reduced under current or elevated pCO2. However, growth and rates of photosynthesis under sub-ambient pCO2 are significantly impaired in the mutants. These findings suggest, that while CA is not limiting for C4 photosynthesis in Z. mays at current pCO2, it likely maintains high rates of photosynthesis when CO2 availability is reduced. Current atmospheric CO2 levels now exceed 400 ppm (~40.53 Pa) and contrast the low CO2 partial pressure (pCO2) conditions under which C4 plants expanded their range ~10 million years ago when the global atmospheric CO2 was below 300 ppm (~30.40 Pa). Thus, as CO2 levels continue to rise, selective pressures for high levels of CA may be limited to arid climates where stomatal closure reduces CO2 availability to the leaf.

Research Organization:
Life Sciences Research Foundation, Baltimore, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Organization:
Life Sciences Research Foundation
Grant/Contract Number:
SC0008510
OSTI ID:
1233449
Journal Information:
Plant Physiology (Bethesda), Vol. 165, Issue 2; ISSN 0032-0889
Publisher:
American Society of Plant BiologistsCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 67 works
Citation information provided by
Web of Science

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Cited By (16)

The molecular evolution of C4 photosynthesis: opportunities for understanding and improving the world’s most productive plants journal November 2018
C 4 photosynthesis in C 3 rice: a theoretical analysis of biochemical and anatomical factors: C 4 photosynthesis in C 3 rice journal October 2016
The draft genome of the C3 panicoid grass species Dichanthelium oligosanthes journal October 2016
Cross species selection scans identify components of C 4 photosynthesis in the grasses journal July 2016
Insights from transcriptome profiling on the non-photosynthetic and stomatal signaling response of maize carbonic anhydrase mutants to low CO2 journal February 2019
Herbarium genomics retraces the origins of C 4 -specific carbonic anhydrase in Andropogoneae (Poaceae) journal March 2018
Three-dimensional microscale modelling of CO 2 transport and light propagation in tomato leaves enlightens photosynthesis : 3-D modelling of photosynthesis in leaves journal July 2015
Identification and characterization of long non-coding RNAs involved in osmotic and salt stress in Medicago truncatula using genome-wide high-throughput sequencing journal June 2015
Translocation of Drought-Responsive Proteins from the Chloroplasts journal January 2020
Online CO 2 and H 2 O oxygen isotope fractionation allows estimation of mesophyll conductance in C 4 plants, and reveals that mesophyll conductance decreases as leaves age in both C 4 and C 3 plants journal January 2016
Molecular diversity and selective sweeps in maize inbred lines adapted to African highlands journal September 2019
Emerging roles for carbonic anhydrase in mesophyll conductance and photosynthesis journal January 2020
Effects of reduced carbonic anhydrase activity on CO 2 assimilation rates in Setaria viridis : a transgenic analysis journal October 2016
Identification of Photosynthesis-Associated C4 Candidate Genes through Comparative Leaf Gradient Transcriptome in Multiple Lineages of C3 and C4 Species journal October 2015
Multiscale Metabolic Modeling of C4 Plants: Connecting Nonlinear Genome-Scale Models to Leaf-Scale Metabolism in Developing Maize Leaves journal March 2016
Real-Time Determination of Photosynthesis, Transpiration, Water-Use Efficiency and Gene Expression of Two Sorghum bicolor (Moench) Genotypes Subjected to Dry-Down journal May 2017

Figures / Tables (7)