Front cover: This image compares Arabidopsis Col-0 wild-type (left) and cipk6 mutants (right)following infection with Pst DC3000. Cipk6 plants show reduced disease symptoms (upperpanel) and increased ROS production as determined by DAB staining (middle panel) andcarboxy-H2DCFDA (lower panel). Vishwakarma et al. (2026) identify CIPK6 and interactingproteins CBL1/9 as negative regulators of RBOHD in Arabidopsis thaliana. Image credit: ShaliniYadav, Niraj Kumar Vishwakarma and Debasis Chattopadhyay. (Vishwakarma et al., https://doi.org/10.1111/tpj.70700).
Auxin response factor (ARF) 和油菜素内酯（BR）在植物生长发育中起重要作用，例如决定叶片角度。然而，ARFs与BR信号在调控番茄叶片角度中的关系尚不明确。本研究报道，auxin-responsive factor 11 (SlARF11)正向调控番茄叶片角度，并对BR表现出超敏性。SlARF11是一种非经典ARF，在叶柄基部的上表皮侧高表达。SlARF11与SlGATA5相互作用并位于其上游，SlGATA5是一种GATA转录因子，通过直接结合其下游基因BRASINOSTEROID-INSENSITIVE 2 (SlBIN2.1)的启动子，从而抑制番茄中SlBIN2.1的表达。
SlARF11介导的叶片角度调控涉及叶柄基部的细胞伸长和木质素沉积，显著促进SlGATA5介导的U型细胞周期蛋白（SlCYCU2；1）和苯丙氨酸氨裂解酶4（SlPAL4）的表达。此外，SlBIN2.1位于SlARF11上游并磷酸化SlARF11，从而增强SlARF11与SlGATA5的相互作用。位于SlBIN2.1下游的RASSINOSTERIOD INSENSITIVE1-EMS-SUPPRESSOR 1 (SlBES1)可抑制SlARF11的表达。
小结：本研究解析了SlARF11介导的信号通路通过BR信号通路影响番茄叶片角度的机制。
原文：SlARF11–SlGATA5 stimulates tomato leaf angle by feedback regulation with brassinosteroid signaling
