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YODA-HSP90 Module Regulates Phosphorylation-Dependent Inactivation of SPEECHLESS to Control Stomatal Development under Acute Heat Stress in Arabidopsis

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Molecular Plant 2020年第4期13卷 612-633页

作者： Despina Samakovli tereza Ticha tereza vavrdova Miroslav Ovecka Ivan Luptovciak Veronika Zapletalova Anna Kucharova Pavel Krenek Yuliya Krasylenko Theoni Margaritopoulou Loukia Roka Dimitra Milioni George Komis Polydefkis Hatzopoulos Jozef Samaj Centre of the Region Hana for Biotechnological and Agricultural Research Faculty of SciencePalacky University OlomoucSlechtitelu 27Olomouc 78371Czech Republic Molecular Biology Laboratory Agricultural University of Athenslera Odos 75Athens 11855Greece Present address:Laboratory of Mycology Department of PhytopathologyBenaki Phytopathological Institute8st.Delta str.GR-14561 KifissiaAtticaGreece

Stomatal ontogenesis,patterning,and function are hallmarks of environmental plant adaptation,especially to conditions limiting plant growth,such as elevated temperatures and reduced water *** specification and distribution of a stomatal cell lineage and its terminal differentiation into guard cells require a master regulatory protein phosphorylation cascade involving the YODA mitogen-activated protein kinase kinase *** signaling results in the activation of MITOGEN-ACTIVATED PROTEIN KINASEs(MPK3 and MPK6),which regulate transcription factors,including SPEECHLESS(SPCH).Here,we report that acute heat stress affects the phosphorylation and deactivation of SPCH and modulates stomatal *** using complem entary molecular,genetic,biochemical,and cell biology approaches,we provide solid evidence that HEAT SHOCK PROTEINS 90(HSP90s)play a crucial role in transducing heat-stress response through the YODA *** studies revealed that YODA and HSP90.1 are epistatic,and they likely function linearly in the same developmental pathway regulating stomata ***90s interact with YODA,affectits cellular polarization,and modulate the phosphorylation of downstream targets,such as MPK6 and SPCH,under both normal and heat-stress ***,HSP90-mediated specification and differentiation of the stomatal cell lineage couples stomatal development to environmental cues,providing an adaptive heat stress response mechanism in plants.

关键词： stomata HSP90 MAPK heat stress Arabidopsis

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