Plant competition cues activate a singlet oxygen signaling pathway in Arabidopsis thaliana.

ABSTRACT: Oxidative stress responses of Arabidopsis to reflected low red to far-red signals (R:FR ≈ 0.3) generated by neighboring weeds or an artificial source of FR light were compared with a weed-free control (R:FR ≈1.6). In the low R:FR treatments, induction of the shade avoidance responses (SAR) coincided with increased leaf production of singlet oxygen (¹O₂). This ¹O₂ increase was not due to protochlorophyllide accumulation and did not cause cell death. Chemical treatments, however, with 5-aminolevulinic acid (the precursor of tetrapyrrole biosynthesis) and glutathione (a quinone A reductant) enhanced cell death and growth inhibition. RNA sequencing revealed that transcriptome responses to the reflected low R:FR light treatments minimally resem

SUBMITTER: Berardi N 

PROVIDER: S-EPMC11368760 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature