Abscisic acid is involved in phenolic compounds biosynthesis, mainly anthocyanins, in leaves of Aristotelia chilensis plants (Mol.) subjected to drought stress

Abstract

Abscisic acid (ABA) regulates the physiological and biochemical mechanisms required to tolerate drought stress, which is considered as an important abiotic stress. It has been postulated that ABA might be involved in regulation of plant phenolic compounds biosynthesis, especially anthocyanins that accumulate in plants subjected to drought stress; however, the evidence for this postulate remains elusive. Therefore, we studied whether ABA is involved in phenolic compounds accumulation, especially anthocyanin biosynthesis, using drought stressed Aristotelia chilensis plants, an endemic berry in Chile. Our approach was to use fluridone, an ABA biosynthesis inhibitor, and then subsequent ABA applications to young and fully-expanded leaves of drought stressed A. chilensis plants during 24, 48 and 72 h of the experiment. Plants were harvested and leaves were collected separately to determine the biochemical status. We observed that fluridone treatments significantly decreased ABA concentrations and total anthocyanin (TA) concentrations in stressed plants, including both young and fully-expanded leaves. TA concentrations following fluridone treatment were reduced around fivefold, reaching control plant levels. ABA application restored ABA levels as well as TA concentrations in stressed plant at 48 h of the experiment. We also observed that TA concentrations followed the same pattern as ABA concentrations in the ABA treated plants. Quantitative real-time PCR revealed that AcUFGT gene expression decreased in fully-expanded leaves of stressed plants treated with fluridone, while a subsequent ABA application increased AcUFGT expression. Taken together, our results suggest that ABA is involved in the regulation of anthocyanin biosynthesis under drought stress.

Selenium and silica nanostructure-based recovery of strawberry plants subjected to drought stress

“…Spraying Se-, SiO 2 - and especially Se/SiO 2 -NPs increased the contents of all three above mentioned biochemical parameters. Increase of anthocyanin and total phenolic contents under drought stress were observed in some plant species 69 . Anthocyanins are a group of phenolic compounds which comprise a large group of secondary metabolites and have antioxidant properties 70 .…”

Growth and physiological responses to successional water deficit and recovery in four warm‐temperate woody species

“…), it is reasonable to expect that aniosohydric species would have a greater osmoregulation ability than isohydric species (Binks et al ). Antioxidant protection also played a role in inter‐ and intracellular signaling for the normal functioning of plant metabolic processes, but it was not present in large amounts, to maintain cell integrity and stability (Table ; González‐Villagra et al ).…”

The ERF transcription factor MdERF38 promotes drought stress‐induced anthocyanin biosynthesis in apple

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