期刊
PLANT JOURNAL
卷 93, 期 3, 页码 431-444出版社
WILEY
DOI: 10.1111/tpj.13797
关键词
abiotic stress; Arabidopsis thaliana; cold stress; osmotic stress; RNA sequencing; RNA silencing; RDR6 (AT3G49500); scopolin; THO1/HPR1/EMU (At5g09860)
资金
- EU (ATHENA) [KBBE-2009-13]
- BMBF [FKZ 031A108B]
- Leibniz Association
- German Academic Exchange Service (DAAD)
- National Science Foundation
Secondary metabolites are involved in the plant stress response. Among these are scopolin and its active form scopoletin, which are coumarin derivatives associated with reactive oxygen species scavenging and pathogen defence. Here we show that scopolin accumulation can be induced in the root by osmotic stress and in the leaf by low-temperature stress in Arabidopsis thaliana. A genetic screen for altered scopolin levels in A. thaliana revealed a mutant compromised in scopolin accumulation in response to stress; the lesion was present in a homologue of THO1 coding for a subunit of the THO/TREX complex. The THO/TREX complex contributes to RNA silencing, supposedly by trafficking precursors of small RNAs. Mutants defective in THO, AGO1, SDS3 and RDR6 were impaired with respect to scopolin accumulation in response to stress, suggesting a mechanism based on RNA silencing such as the trans-acting small interfering RNA pathway, which requires THO/TREX function.
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