Abstract:Singlet oxygen (1O2) has a very short half-life of 10−5 s; however, it is a strong oxidant that causes growth arrest and necrotic lesions on plants1–4. Its signaling pathway remains largely unknown. The Arabidopsis flu (FLUORESCENT) mutant accumulates a high level of 1O2 and shows drastic changes in nuclear gene expression5. Only two plastid proteins, EX1 (EXECUTER 1) and EX2 (EXECUTER 2), have been identified in the singlet oxygen signaling6,7. Here we found that the transcription factor ABI4 (ABSCISIC ACID I… Show more
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