open access publication

Article, 2019

ABA-mediated regulation of leaf and root hydraulic conductance in tomato grown at elevated CO2 is associated with altered gene expression of aquaporins

Horticulture Research, ISSN 2662-6810, 2052-7276, Volume 6, 1, Page 104, 10.1038/s41438-019-0187-6

Contributors

Fang, Liang 0000-0002-0989-0092 [1] [2] Abdelhakim, Lamis Osama Anwar 0000-0002-4300-6731 [2] Hegelund, Josefine Nymark 0000-0002-5663-9503 [2] Li, Shenglan 0000-0002-9892-4599 [2] Liu, Jie 0000-0002-7780-6323 [2] [3] Peng, Xiao-Ying [2] [4] Li, Xiangnan 0000-0003-0417-9151 [5] Wei, Zhenhua 0000-0001-6672-9708 [2] [3] Liu, Fu-Lai 0000-0002-5006-8965 (Corresponding author) [2] [3]

Affiliations

  1. [1] Wageningen University & Research
    2. [NORA names: Netherlands; Europe, EU; OECD];
  2. [2] University of Copenhagen
    3. [NORA names: KU University of Copenhagen; University; Denmark; Europe, EU; Nordic; OECD];
  3. [3] North West Agriculture and Forestry University
    4. [NORA names: China; Asia, East];
  4. [4] Hunan Agricultural University
    5. [NORA names: China; Asia, East];
  5. [5] Northeast Institute of Geography and Agroecology
    6. [NORA names: China; Asia, East]

Abstract

Elevated CO2 concentration in the air (e[CO2]) decreases stomatal density (SD) and stomatal conductance (g s) where abscisic acid (ABA) may play a role, yet the underlying mechanism remains largely elusive. We investigated the effects of e[CO2] (800 ppm) on leaf gas exchange and water relations of two tomato (Solanum lycopersicum) genotypes, Ailsa Craig (WT) and its ABA-deficient mutant (flacca). Compared to plants grown at ambient CO2 (400 ppm), e[CO2] stimulated photosynthetic rate in both genotypes, while depressed the g s only in WT. SD showed a similar response to e[CO2] as g s, although the change was not significant. e[CO2] increased leaf and xylem ABA concentrations and xylem sap pH, where the increases were larger in WT than in flacca. Although leaf water potential was unaffected by CO2 growth environment, e[CO2] lowered osmotic potential, hence tended to increase turgor pressure particularly for WT. e[CO2] reduced hydraulic conductance of leaf and root in WT but not in flacca, which was associated with downregulation of gene expression of aquaporins. It is concluded that ABA-mediated regulation of g s, SD, and gene expression of aquaporins coordinates the whole-plant hydraulics of tomato grown at different CO2 environments.

Keywords

ABA concentration, ABA-deficient mutants, Ailsa, Ailsa Craig, CO2, Craig, WT, abscisic acid, acid, air, altered gene expression, ambient CO<sub>2</sub>, aquaporin, associated with altered gene expression, associated with downregulation, changes, concentration, conductivity, decreased stomatal density, density, effect, elevated CO2, elevated CO<sub>2</sub> concentration, environment, exchange, expression, expression of aquaporins, gas exchange, gene expression, gene expression of aquaporins, genes, genotypes, growth, growth environment, hydraulic conductivity, increase, increased leaf, increased turgor pressure, leaf, leaf gas exchange, leaf water potential, lowered osmotic potential, mechanism, mutants, osmotic potential, photosynthetic rate, plants, potential, pressure, rate, reduced hydraulic conductivity, regulation, regulation of leaf, relations, response, root, root hydraulic conductivity, sap pH, stimulated photosynthetic rates, stomatal conductance, stomatal density, tomato, turgor pressure, water, water potential, water relations, whole-plant hydraulics, xylem, xylem ABA concentration, xylem sap pH

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