Sugar starvation activates the OsSnRK1a-OsbHLH111/OsSGI1-OsTPP7 module to mediate growth inhibition of rice.

ABSTRACT: Sugar deficiency is the persistent challenge for plants during development. Trehalose-6-phosphate (T6P) is recognized as a key regulator in balancing plant sugar homeostasis. However, the underlying mechanisms by which sugar starvation limits plant development are unclear. Here, a basic helix-loop-helix (bHLH) transcription factor (OsbHLH111) was named starvation-associated growth inhibitor 1 (OsSGI1) and the focus is on the sugar shortage of rice. The transcript and protein levels of OsSGI1 were markedly increased during sugar starvation. The knockout mutants sgi1-1/2/3 exhibited increased grain size and promoted seed germination and vegetative growth, which were opposite to those of overexpression lines. The direct binding of OsSGI1 to sucrose non-fermenting-1 (SNF1)-related protein kina

SUBMITTER: Wang K 

PROVIDER: S-EPMC10502754 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature