Gibberellin-Abscisic Acid Balances during Arbuscular Mycorrhiza Formation in Tomato

0463759 - ÚEB 2017 RIV CH eng J - Journal Article
Martin-Rodriguez, J.A. - Huertas, R. - Ho-Plagaro, T. - Ocampo, J.A. - Turečková, Veronika - Tarkowská, Danuše - Ludwig-Mueller, J. - Garcia-Garrido, J.M.
Gibberellin-Abscisic Acid Balances during Arbuscular Mycorrhiza Formation in Tomato.
Frontiers in Plant Science. Roč. 7, AUG 23 (2016), s. 1273. ISSN 1664-462X. E-ISSN 1664-462X
R&D Projects: GA ČR GA14-34792S; GA MŠMT(CZ) LO1204
Institutional support: RVO:61389030
Keywords : arbuscular mycorrhiza * plant hormones * gibberellins
Subject RIV: CB - Analytical Chemistry, Separation
Impact factor: 4.291, year: 2016

Plant hormones have become appropriate candidates for driving functional plant mycorrhization programs, including the processes that regulate the formation of arbuscules in arbuscular mycorrhizal (AM) symbiosis. Here, we examine the role played by ABA/GA interactions regulating the formation of AM in tomato. We report differences in ABA and GA metabolism between control and mycorrhizal roots. Active synthesis and catabolism of ABA occur in AM roots. GAs level increases as a consequence of a symbiosis-induced mechanism that requires functional arbuscules which in turn is dependent on a functional ABA pathway. A negative interaction in their metabolism has been demonstrated. ABA attenuates GA-biosynthetic and increases GA-catabolic gene expression leading to a reduction in bioactive GAs. Vice versa, GA activated ABA catabolism mainly in mycorrhizal roots. The negative impact of GA; on arbuscule abundance in wild-type plants is partially offset by treatment with ABA and the application of a GA biosynthesis inhibitor rescued the arbuscule abundance in the ABA-deficient sitiens mutant. These findings, coupled with the evidence that ABA application leads to reduce bioactive GAi, support the hypothesis that ABA could act modifying bioactive GA level to regulate AM. Taken together, our results suggest that these hormones perform essential functions and antagonize each other by oppositely regulating AM formation in tomato roots.
Permanent Link: http://hdl.handle.net/11104/0262843