Spatiotemporal auxin distribution in Arabidopsis tissues is regulated by anabolic and catabolic reactions under long-term ammonium stress

BMC Plant Biology

Anna Podgórska¹  Katarzyna Dobrzyńska¹  Kacper Dziewit¹  Bożena Szal¹  Ondřej Novák²  Aleš Pěnčík² 

[1]Institute of Plant Bioenergetics, Faculty of Biology, University of Warsaw, I. Miecznikowa 01, 02-096, Warsaw, Poland

[2]Laboratory of Growth Regulators, Faculty of Science, Palacký University and Institute of Experimental Botany, The Czech Academy of Sciences, Šlechtitelů 27, CZ-78371, Olomouc, Czech Republic

关键词: Ammonium nutrition;    Arabidopsis thaliana;    Auxin conjugation;    Auxin degradation;    Auxin synthesis;    Root development;   

DOI  :  10.1186/s12870-021-03385-9

来源: Springer

【 摘 要 】

BackgroundThe plant hormone auxin is a major coordinator of plant growth and development in response to diverse environmental signals, including nutritional conditions. Sole ammonium (NH4+) nutrition is one of the unique growth-suppressing conditions for plants. Therefore, the quest to understand NH4+-mediated developmental defects led us to analyze auxin metabolism.ResultsIndole-3-acetic acid (IAA), the most predominant natural auxin, accumulates in the leaves and roots of mature Arabidopsis thaliana plants grown on NH4+, but not in the root tips. We found changes at the expressional level in reactions leading to IAA biosynthesis and deactivation in different tissues. Finally, NH4+ nutrition would facilitate the formation of inactive oxidized IAA as the final product.ConclusionsNH4+-mediated accelerated auxin turnover rates implicate transient and local IAA peaks. A noticeable auxin pattern in tissues correlates with the developmental adaptations of the short and highly branched root system of NH4+-grown plants. Therefore, the spatiotemporal distribution of auxin might be a root-shaping signal specific to adjust to NH4+-stress conditions.

【 授权许可】

CC BY