Low-glutathione mutants are impaired in growth but do not show an increased sensitivity to moderate water deficit


Autoři: Sajid A. K. Bangash aff001;  Stefanie J. Müller-Schüssele aff001;  David Solbach aff001;  Marcus Jansen aff002;  Fabio Fiorani aff002;  Markus Schwarzländer aff001;  Stanislav Kopriva aff004;  Andreas J. Meyer aff001
Působiště autorů: INRES–Chemical Signalling, University of Bonn, Bonn, Germany aff001;  IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, Jülich, Germany aff002;  Bioeconomy Science Center, c/o Forschungszentrum Jülich, Jülich, Germany aff003;  Botanical Institute, Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Germany aff004
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0220589

Souhrn

Glutathione is considered a key metabolite for stress defense and elevated levels have frequently been proposed to positively influence stress tolerance. To investigate whether glutathione affects plant performance and the drought tolerance of plants, wild-type Arabidopsis plants and an allelic series of five mutants (rax1, pad2, cad2, nrc1, and zir1) with reduced glutathione contents between 21 and 63% compared to wild-type glutathione content were phenotypically characterized for their shoot growth under control and water-limiting conditions using a shoot phenotyping platform. Under non-stress conditions the zir1 mutant with only 21% glutathione showed a pronounced dwarf phenotype. All other mutants with intermediate glutathione contents up to 62% in contrast showed consistently slightly smaller shoots than the wild-type. Moderate drought stress imposed through water withdrawal until shoot growth ceased showed that wild-type plants and all mutants responded similarly in terms of chlorophyll fluorescence and growth retardation. These results lead to the conclusion that glutathione is important for general plant performance but that the glutathione content does not affect tolerance to moderate drought conditions typically experienced by crops in the field.

Klíčová slova:

Arabidopsis thaliana – Drought adaptation – Glutathione – Leaves – Phenotypes – Plant resistance to abiotic stress – Seedlings – Water resources


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2019 Číslo 10