Affiliation:
1. State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China Sichuan Agricultural University Chengdu 611130 Sichuan China
2. Rice Research Institute Sichuan Agricultural University Chengdu 611130 Sichuan China
3. Technical Center of Chengdu Customs Chengdu 610041 Sichuan China
Abstract
SUMMARYBrassinosteroids (BRs) are a class of steroid phytohormones that control various aspects of plant growth and development. Several transcriptional factors (TFs) have been suggested to play roles in BR signaling. However, their possible relationship remains largely unknown. Here, we identified a rice mutant dwarf and low‐tillering 2 (dlt2) with altered plant architecture, increased grain width, and reduced BR sensitivity. DLT2 encodes a GIBBERELLIN INSENSITIVE (GAI)‐REPRESSOR OF GAI (RGA)‐SCARECROW (GRAS) TF that is mainly localized in the nucleus and has weak transcriptional activity. Our further genetic and biochemical analyses indicate that DLT2 interacts with two BR‐signaling‐related TFs, DLT and BRASSINAZOLE‐RESISTANT 1, and probably modulates their transcriptional activity. These findings imply that DLT2 is implicated in a potentially transcriptional complex that mediates BR signaling and rice development and suggests that DLT2 could be a potential target for improving rice architecture and grain morphology. This work also sheds light on the role of rice GRAS members in regulating numerous developmental processes.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Sichuan Province
Subject
Cell Biology,Plant Science,Genetics
Cited by
2 articles.
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