Rice panicle architecture affects grain number per panicle and therefore determines grain yield.The receptor-like kinase OsER1 regulates panicle development by perceiving extracellular small peptide ligands;however,ho...Rice panicle architecture affects grain number per panicle and therefore determines grain yield.The receptor-like kinase OsER1 regulates panicle development by perceiving extracellular small peptide ligands;however,how activated OsER1 fine-tunes panicle morphogenesis remains unclear.This study reveals that members of the conserved SEVEN IN ABSENTIA OF RICE(SINAR)E3 ubiquitin ligase family regulate rice spikelet number in either synergistic or antagonistic manners by modulating the ubiquitination and stability of OsER1.Notably,SINAR1 and SINAR6 reduce the ubiquitination activity of SINAR2/3/4/5 through heterodimer formation,acting as a molecular brake to protect OsER1 from vacuolar degradation.These findings identify SINAR1 and SINAR6 as key components of a negative feedback mechanism that ensures optimal OsER1 signaling and shapes panicle architecture.Targeted suppression of SINAR1 and SINAR6 markedly enhances grain yield by promoting OsER1 degradation,demonstrating that attenuation of OsER1-mediated developmental signaling-while maintaining its function-optimizes rice panicle architecture without compromising spikelet fertility.Together,our findings reveal an antagonistic,ligase-mediated regulatory mechanism that maintains receptor homeostasis and provide a strategy to enhance rice yield through manipulation of dichotomous SINA E3 ligases.展开更多
Global warming impacts crop production and threatens food security.Elevated temperatures are sensed by different cell components.Temperature increases are classified as either mild warm temperatures or excessively hot...Global warming impacts crop production and threatens food security.Elevated temperatures are sensed by different cell components.Temperature increases are classified as either mild warm temperatures or excessively hot temperatures,which are perceived by distinct signaling pathways in plants.Warm temperatures induce thermomorphogenesis,while high-temperature stress triggers heat acclimation and has destructive effects on plant growth and development.In this review,we systematically summarize the heat-responsive genetic networks in Arabidopsis and crop plants based on recent studies.In addition,we highlight the strategies used to improve grain yield under heat stress from a source-sink perspective.We also discuss the remaining issues regarding the characteristics of thermosensors and the urgency required to explore the basis of acclimation under multifactorial stress combination.展开更多
基金supported by the National Key Research and Development Program of China(2022YFD1200102)the National Natural Science Foundation of China(32388201)+1 种基金the Biological Breeding-National Science and Technology Major Project(2023ZD0406801)the CAS-Croucher Funding Scheme for Joint Laboratories,and the State Key Laboratory of Plant Trait Design.
文摘Rice panicle architecture affects grain number per panicle and therefore determines grain yield.The receptor-like kinase OsER1 regulates panicle development by perceiving extracellular small peptide ligands;however,how activated OsER1 fine-tunes panicle morphogenesis remains unclear.This study reveals that members of the conserved SEVEN IN ABSENTIA OF RICE(SINAR)E3 ubiquitin ligase family regulate rice spikelet number in either synergistic or antagonistic manners by modulating the ubiquitination and stability of OsER1.Notably,SINAR1 and SINAR6 reduce the ubiquitination activity of SINAR2/3/4/5 through heterodimer formation,acting as a molecular brake to protect OsER1 from vacuolar degradation.These findings identify SINAR1 and SINAR6 as key components of a negative feedback mechanism that ensures optimal OsER1 signaling and shapes panicle architecture.Targeted suppression of SINAR1 and SINAR6 markedly enhances grain yield by promoting OsER1 degradation,demonstrating that attenuation of OsER1-mediated developmental signaling-while maintaining its function-optimizes rice panicle architecture without compromising spikelet fertility.Together,our findings reveal an antagonistic,ligase-mediated regulatory mechanism that maintains receptor homeostasis and provide a strategy to enhance rice yield through manipulation of dichotomous SINA E3 ligases.
基金supported by the Shanghai Pujiang Program(22PJ1406500)the Shanghai Jiao Tong University 2030 Initiative(WH510363001-11)+3 种基金the National Natural Science Foundation of China(32388201 and 32201705)the Chinese Academy of Sciences(XDB27010104)the Laboratory of Lingnan Modern Agriculture Project(NT2021002)a project funded by the China Postdoctoral Science Foundation(2022T150648).
文摘Global warming impacts crop production and threatens food security.Elevated temperatures are sensed by different cell components.Temperature increases are classified as either mild warm temperatures or excessively hot temperatures,which are perceived by distinct signaling pathways in plants.Warm temperatures induce thermomorphogenesis,while high-temperature stress triggers heat acclimation and has destructive effects on plant growth and development.In this review,we systematically summarize the heat-responsive genetic networks in Arabidopsis and crop plants based on recent studies.In addition,we highlight the strategies used to improve grain yield under heat stress from a source-sink perspective.We also discuss the remaining issues regarding the characteristics of thermosensors and the urgency required to explore the basis of acclimation under multifactorial stress combination.
