Long days induce adaptive secondary dormancy in the seeds of the Mediterranean plant Aethionema arabicum.
Curr Biol
; 34(13): 2893-2906.e3, 2024 Jul 08.
Article
in En
| MEDLINE
| ID: mdl-38876102
ABSTRACT
Secondary dormancy is an adaptive trait that increases reproductive success by aligning seed germination with permissive conditions for seedling establishment. Aethionema arabicum is an annual plant and member of the Brassicaceae that grows in environments characterized by hot and dry summers. Aethionema arabicum seeds may germinate in early spring when seedling establishment is permissible. We demonstrate that long-day light regimes induce secondary dormancy in the seeds of Aethionema arabicum (CYP accession), repressing germination in summer when seedling establishment is riskier. Characterization of mutants screened for defective secondary dormancy demonstrated that RGL2 mediates repression of genes involved in gibberellin (GA) signaling. Exposure to high temperature alleviates secondary dormancy, restoring germination potential. These data are consistent with the hypothesis that long-day-induced secondary dormancy and its alleviation by high temperatures may be part of an adaptive response limiting germination to conditions permissive for seedling establishment in spring and autumn.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Seeds
/
Germination
/
Brassicaceae
/
Plant Dormancy
Language:
En
Journal:
Curr Biol
/
Curr. biol
/
Current biology
Journal subject:
BIOLOGIA
Year:
2024
Document type:
Article
Country of publication:
Reino Unido