Gibberellin-Abscisic Acid Balances during Arbuscular Mycorrhiza Formation in Tomato.

ABSTRACT: 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. Vic

SUBMITTER: Martin-Rodriguez JA 

PROVIDER: S-EPMC4993810 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature