Skip to Main content Skip to Navigation
Journal articles

Barley Plants Overexpressing Ferrochelatases (HvFC1 and HvFC2) Show Improved Photosynthetic Rates and Have Reduced Photo-Oxidative Damage under Drought Stress than Non-Transgenic Controls

Abstract : We investigated the roles of two Ferrochelatases (FCs), which encode the terminal enzyme for heme biosynthesis, in drought and oxidative stress tolerance in model cereal plant barley (Hordeum vulgare). Three independent transgenic lines ectopically overexpressing either barley FC1 or FC2 were selected and evaluated under well-watered, drought, and oxidative stress conditions. Both HvFC1 and HvFC2 overexpressing transgenics showed delayed wilting and maintained higher photosynthetic performance relative to controls, after exposure to soil dehydration. In each case, HvFC overexpression significantly upregulated the nuclear genes associated with detoxification of reactive oxygen species (ROS) upon drought stress. Overexpression of HvFCs, also suppressed photo-oxidative damage induced by the deregulated tetrapyrrole biosynthesis mutant tigrina d12. Previous studies suggest that only FC1 is implicated in stress defense responses, however, our study demonstrated that both FC1 and FC2 affect drought stress tolerance. As FC-derived free heme was proposed as a chloroplast-to-nuclear signal, heme could act as an important signal, stimulating drought responsive nuclear gene expression. This study also highlighted tetrapyrrole biosynthetic enzymes as potential targets for engineering improved crop performance, both in well-watered and water-limited environments.
Complete list of metadata

Cited literature [68 references]  Display  Hide  Download

https://hal.inrae.fr/hal-02989386
Contributor : Dominique Fournier <>
Submitted on : Thursday, November 5, 2020 - 10:29:24 AM
Last modification on : Friday, November 6, 2020 - 5:08:28 AM

File

Nagahatenna-Agron-2020-CC-BY.p...
Files produced by the author(s)

Identifiers

Citation

Dilrukshi Nagahatenna, Boris Parent, Everard Edwards, Peter Langridge, Ryan Whitford. Barley Plants Overexpressing Ferrochelatases (HvFC1 and HvFC2) Show Improved Photosynthetic Rates and Have Reduced Photo-Oxidative Damage under Drought Stress than Non-Transgenic Controls. Agronomy, MDPI, 2020, 10 (9), pp.1351. ⟨10.3390/agronomy10091351⟩. ⟨hal-02989386⟩

Share

Metrics

Record views

49

Files downloads

55