ShHTL7 requires functional brassinosteroid signaling to initiate GA-independent germination.
Plant Signal Behav
; 16(3): 1855845, 2021 03 04.
Article
en En
| MEDLINE
| ID: mdl-33300428
ABSTRACT
In the model plant Arabidopsis thaliana, two mutually antagonistic hormones regulate germination abscisic acid (ABA) which promotes dormancy and gibberellins (GA) which breaks dormancy. Mutants auxotrophic for or insensitive to GA do not germinate. However, changes in the signaling flux through other hormone pathways will permit GA-independent germination. These changes include increased brassinosteroid (BR) signaling and decreased ABA signaling. Recently, strigolactone (SL) was also shown to enable GA-independent germination, provided the seeds express the SL receptor ShHTL7 from the parasitic plant Striga hermonthica. Here we show that a mutation which reduces sensitivity to BR (bri1-6) prevents ShHTL7 from promoting GA-independent germination. Further, we show that neither ShHTL7 nor the constitutive karrikin signaling mutant smax1-2 confer insensitivity to ABA. These results suggest ShHTL7 requires functional BR perception to bypass the GA requirement for germination.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Proteínas de Plantas
/
Transducción de Señal
/
Germinación
/
Striga
/
Brasinoesteroides
/
Giberelinas
Idioma:
En
Revista:
Plant Signal Behav
Asunto de la revista:
BOTANICA
/
FISIOLOGIA
Año:
2021
Tipo del documento:
Article
País de afiliación:
Canadá