Abstract
BackgroundStrigolactones (SLs) are considered to be a novel class of phytohormone involved in plant defense responses. Currently, their relationships with other plant hormones, such as abscisic acid (ABA), during responses to salinity stress are largely unknown.ResultsIn this study, the relationship between SL and ABA during the induction of H2O2 – mediated tolerance to salt stress were studied in arbuscular mycorrhizal (AM) Sesbania cannabina seedlings. The SL levels increased after ABA treatments and decreased when ABA biosynthesis was inhibited in AM plants. Additionally, the expression levels of SL-biosynthesis genes in AM plants increased following treatments with exogenous ABA and H2O2. Furthermore, ABA-induced SL production was blocked by a pre-treatment with dimethylthiourea, which scavenges H2O2. In contrast, ABA production was unaffected by dimethylthiourea. Abscisic acid induced only partial and transient increases in the salt tolerance of TIS108 (a SL synthesis inhibitor) treated AM plants, whereas SL induced considerable and prolonged increases in salt tolerance after a pre-treatment with tungstate.ConclusionsThese results strongly suggest that ABA is regulating the induction of salt tolerance by SL in AM S. cannabina seedlings.
Highlights
Strigolactones (SLs) are considered to be a novel class of phytohormone involved in plant defense responses
Effects of abscisic acid (ABA) levels on strigolactone accumulation In S. cannabina seedlings inoculated with an arbuscular mycorrhizal (AM) fungus, the root colonization rate steadily increased as seedlings grew and differed significantly between sampling times (Table 1)
To determine whether ABA affects SL generation, we examined the changes in SL levels in AM S. cannabina seedlings after ABA and tungstate treatments
Summary
Strigolactones (SLs) are considered to be a novel class of phytohormone involved in plant defense responses. Their relationships with other plant hormones, such as abscisic acid (ABA), during responses to salinity stress are largely unknown. Saline-alkali stress is a serious ecological problem that negatively impacts plant survival, development, and productivity [1]. To survive such stress, plants have established beneficial associations with several microorganisms present in the rhizosphere that can alleviate the stress symptoms [2]. One of the most intensively studied and widespread mutualistic plant–microorganism associations involves arbuscular mycorrhizal (AM) fungi.
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