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Abscisic acid

About: Abscisic acid is a research topic. Over the lifetime, 12876 publications have been published within this topic receiving 587031 citations. The topic is also known as: (+)-Abscisic acid & Abscisic acid.


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01 Jan 2017
TL;DR: Taken together, AHLs probably induce an SA-dependent induced systemic resistance in barley via defense gene priming, while the root-accumulated NO is a possible second messenger leading to SA- Accumulation in barley leaves.
Abstract: N-Acyl-D/L-homoserine lactones (AHLs) are produced as microbial signaling compounds during bacterial intra- and inter-specific communication in the rhizosphere. Thus, plants are naturally exposed to these compounds and respond with tissue-specific reactions. In the present study the impact of AHLs on the monocot barley (Hordeum vulgare L.) was investigated. The treatment with C8- and C12- homoserine lactones (HSL) resulted in root and shoot biomass gain as well as in the formation of lateral roots. It is assumed that nitric oxide (NO) has an impact on the lateral root formation. Both AHL derivatives induced the accumulation of NO in the root tissue, while the C12-HSL mediated NO production was lower. Furthermore, investigations on the nutrient uptake underpin increased plant growth. It was determined that 10 µM C8-HSL was the only tested concentration to induce K+ uptake in root epidermal cells. In contrast, all tested concentrations of C12-HSL could stimulate a K+ uptake in roots. It is hypothesized that an AHL-mediated plasma membrane hyperpolarization is the fundamental mechanism of the K+ influx. Systemic induced AHL reactions were also investigated. An RNA seq based transcriptome analysis revealed that C8-HSL treatment induced gene transcripts involved in cell metabolism and partly in defense, while after C12-HSL mainly defense genes were differentially regulated. The investigation of the expression pattern of 6 significantly regulated genes by qRT-PCR revealed a systemic regulation of important defense and PR genes that is mainly caused by salicylic acid (SA). These are a bHLH transcription factor that might be involved in iron-deficiency response; an acidic chitinase (PR3), a subtilisin-chymotrypsin inhibitor 2A (PR6), a leaf specific thionin (PR13), a ribosome-inactivating protein JIP60, and a chaperon protein DnaJ (HSP40). As a systemic response upon AHL exposure, the phytohormone SA accumulated in barley leaves, while the jasmonic acid and jasmonic acid isoleucine content remained unaffected. Additionally, only C12-HSL induced abscisic acid accumulation in barley leaves. Moreover, investigations of the phenylalanine ammonia lyase kinetics in barley leaves revealed that this enzyme reached its highest activity 12 h after AHL application for both AHL derivatives. Despite the enhanced enzyme activity, the flavonoid content (lutonarin and saponarin) was not influenced. A treatment duration of 24 and 96 h with C8- and C12-HSL effected a systemic reduction of the biotrophic pathogen Xanthomonas translucens pv. cerealis. Taken together, besides growth, AHLs probably induce an SA-dependent induced systemic resistance in barley via defense gene priming, while the root-accumulated NO is a possible second messenger leading to SA-accumulation in barley leaves.

7 citations

Journal ArticleDOI
TL;DR: It was concluded that there was a great variation on endogenous plant hormones among the annual wild Cicer species and the data may support selection for various attributes.
Abstract: All processes that regulate of growth, differentiation and development and also stomatal movement are influenced by endogenous hormones in plants. Research related with endogenous hormones is known for cultivated chickpea (Cicer arietinum L.), while in wild chickpeas no data existed. In this study, C. bijugum K.H. Rech.; C. chorassanicum (Bge) M. Pop.; C. cuneatum Hochst. ex Rich.; C. echinospermum P.H. Davis; C. judaicum Boiss.; C. pinnatifidum Jaub. et Sp.; C. reticulatum Ladiz.; and C. yamashitae Kitamura were evaluated for variations in endogenous plant hormone concentrations; indole-3-acetic acid, zeatin, gibberellic acid, and abscisic acid in both leaf and pod. It was concluded that there was a great variation on endogenous plant hormones among the annual wild Cicer species. The data may support selection for various attributes.

7 citations

Journal ArticleDOI
TL;DR: It is proposed that a high ABA level supports the transition of plants to flowering, while a low ABAlevel may be responsible for a low photoperiodic sensitivity of cotyledons in Xanthium plants.
Abstract: The cotyledons ofXanthium strumarium plants are of low sensitivity to photoperiodic treatment and contain only trace amounts of ABA under long-day conditions The first pair of leaves, very sensitive to photoperiodic treatment, contains a higher level ofABA, decreasing with age of the plant Prolonged short-day photoperiodic treatment increases the ABA level in the cotyledons but this is still 10times lower than in the first two leaves Exogenous 10−4M ABA increases the ABA level in the cotyledons to the level corresponding to that in the first leaves, and enhances the photoperiodic sensitivity of cotyledons In contrast to cotyledons, the photoperiodic treatment affects the ABA level in the first pair of leaves only slightly The authors propose that a high ABA level supports the transition of plants to flowering, while a low ABA level may be responsible for a low photoperiodic sensitivity of cotyledons inXanthium plants

7 citations

Journal ArticleDOI
TL;DR: Analysis of ABA- and auxin-related mutants shows that AUX1 is also required for SSA-mediated suppression of primary root growth, and identifiesAUX1-mediated auxin transport as a key transmission step in the sensing of excessive ammonium exposure and its inhibitory effect on root development.
Abstract: A plastic root system is a prerequisite for successful plant acclimation to variable environments. The normally functioning root system is the result of a complex interaction of root-borne signals and shoot-derived regulators. We recently demonstrated that AUX1, a well-studied component of auxin transport, mediates shoot-supplied ammonium (SSA) inhibition of lateral root (LR) formation in Arabidopsis. By contrast, the response did not involve ABA pathways, via which several other abiotic stresses affect LR formation. We proposed that SSA regulates LR emergence by interrupting AUX1-mediated auxin transport from shoot to root. Here, by analyzing both ABA- and auxin-related mutants, we show that AUX1 is also required for SSA-mediated suppression of primary root growth. Ammonium content in shoots was furthermore shown to increase linearly with shoot-, but not root-supplied, ammonium, suggesting it may represent the internal trigger for SSA inhibition of root development. Taken together, our data identify AUX1-mediated auxin transport as a key transmission step in the sensing of excessive ammonium exposure and its inhibitory effect on root development.

7 citations

Patent
26 Nov 1991
TL;DR: In this article, the authors proposed a method to promote fattening and growth of reserve organs such as root part or a fruit of crops by combining or mixing natural type abscisic acid with gibberellin and treating the crops such as a melon, a persimmon, a Japanese radish or rice with the resultant combination or mixture.
Abstract: PURPOSE:To promote fattening and growth of reserve organs such as a root part or a fruit of crops by combining or mixing natural type abscisic acid with gibberellin and treating the crops such as a melon, a persimmon, a Japanese radish or rice with the resultant combination or mixture. CONSTITUTION:Natural type abscisic acid [i.e., (+)-2-cis,4-trans-abscisic acid] which is one of phytohormones is combined or mixed with gibberellin and the resultant combination or mixture is sprayed so as to uniformly wet the whole tree or each fruit in, e.g. a fattening period or a coloring starting period of the fruit in the case of spraying treatment or applied to the peduncle part above the fruit or the trunk in the same period in the case of paste application treatment to promote the fattening and growth of the crops. Remarkably improved effects are exhibited by using the natural type abscisic acid and gibberellin together.

7 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023724
20221,548
2021679
2020666
2019637
2018564