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Role of plant growth-promoting bacteria in sustainable agriculture. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2020. [DOI: 10.1016/j.bcab.2020.101842] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Porcel R, Zamarreño ÁM, García-Mina JM, Aroca R. Involvement of plant endogenous ABA in Bacillus megaterium PGPR activity in tomato plants. BMC PLANT BIOLOGY 2014; 14:36. [PMID: 24460926 PMCID: PMC3903769 DOI: 10.1186/1471-2229-14-36] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 01/23/2014] [Indexed: 05/08/2023]
Abstract
BACKGROUND Plant growth-promoting rhizobacteria (PGPR) are naturally occurring soil bacteria which benefit plants by improving plant productivity and immunity. The mechanisms involved in these processes include the regulation of plant hormone levels such as ethylene and abscisic acid (ABA). The aim of the present study was to determine whether the activity of Bacillus megaterium PGPR is affected by the endogenous ABA content of the host plant. The ABA-deficient tomato mutants flacca and sitiens and their near-isogenic wild-type parental lines were used. Growth, stomatal conductance, shoot hormone concentration, competition assay for colonization of tomato root tips, and root expression of plant genes expected to be modulated by ABA and PGPR were examined. RESULTS Contrary to the wild-type plants in which PGPR stimulated growth rates, PGPR caused growth inhibition in ABA-deficient mutant plants. PGPR also triggered an over accumulation of ethylene in ABA-deficient plants which correlated with a higher expression of the pathogenesis-related gene Sl-PR1b. CONCLUSIONS Positive correlation between over-accumulation of ethylene and a higher expression of Sl-PR1b in ABA-deficient mutant plants could indicate that maintenance of normal plant endogenous ABA content may be essential for the growth promoting action of B. megaterium by keeping low levels of ethylene production.
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Affiliation(s)
- Rosa Porcel
- Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín (EEZ-CSIC), Profesor Albareda 1, 18008 Granada, Spain
| | - Ángel María Zamarreño
- CIPAV TimacAGRO International-Roullier Group, Polígono Arazuri-Orkoien, c/C no. 32, 31160-Orkoien, Navarra, Spain
| | - José María García-Mina
- CIPAV TimacAGRO International-Roullier Group, Polígono Arazuri-Orkoien, c/C no. 32, 31160-Orkoien, Navarra, Spain
| | - Ricardo Aroca
- Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín (EEZ-CSIC), Profesor Albareda 1, 18008 Granada, Spain
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Buta JG, Spaulding DW. Allelochemicals in tall fescue-abscisic and phenolic acids. J Chem Ecol 2013; 15:1629-36. [PMID: 24272104 DOI: 10.1007/bf01012389] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/1988] [Accepted: 08/01/1988] [Indexed: 11/26/2022]
Abstract
Growth inhibitors that can be leached from excised leaves of tall fescue grass (Festuca arundinacea) were investigated as allelochemicals. Leachates of desiccated Rebel and Kentucky 31 grass cultivars contained three principal inhibitory compounds, abscisic acid (ABA), caffeic acid, andp-coumaric acid. After quantitative analysis, abscisic acid was determined to be the predominant inhibitor. A 10-fold increase in ABA levels in leachates occurred after one day of desiccation. The concentration of ABA was 40% greater in Kentucky 31 leachate than in Rebel. This difference was also found in subsequent analyses of leachates of grasses that had been allowed to dry up to 30 days; however, the ABA concentration was reduced by 60% from the 10-fold increased levels.
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Affiliation(s)
- J G Buta
- Agricultural Research Service U.S. Department of Agriculture, Plant Hormone Laboratory Beltsville Agricultural Research Center, 20705, Beltsville, Maryland
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Choi Y, Lee Y, Kim SY, Lee Y, Hwang JU. Arabidopsis ROP-interactive CRIB motif-containing protein 1 (RIC1) positively regulates auxin signalling and negatively regulates abscisic acid (ABA) signalling during root development. PLANT, CELL & ENVIRONMENT 2013; 36:945-955. [PMID: 23078108 DOI: 10.1111/pce.12028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Auxin and abscisic acid (ABA) modulate numerous aspects of plant development together, mostly in opposite directions, suggesting that extensive crosstalk occurs between the signalling pathways of the two hormones. However, little is known about the nature of this crosstalk. We demonstrate that ROP-interactive CRIB motif-containing protein 1 (RIC1) is involved in the interaction between auxin- and ABA-regulated root growth and lateral root formation. RIC1 expression is highly induced by both hormones, and expressed in the roots of young seedlings. Whereas auxin-responsive gene induction and the effect of auxin on root growth and lateral root formation were suppressed in the ric1 knockout, ABA-responsive gene induction and the effect of ABA on seed germination, root growth and lateral root formation were potentiated. Thus, RIC1 positively regulates auxin responses, but negatively regulates ABA responses. Together, our results suggest that RIC1 is a component of the intricate signalling network that underlies auxin and ABA crosstalk.
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Affiliation(s)
- Yunjung Choi
- POSTECH-UZH Global Research Laboratory, Division of Molecular Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Korea
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Peralta KD, Araya T, Valenzuela S, Sossa K, Martínez M, Peña-Cortés H, Sanfuentes E. Production of phytohormones, siderophores and population fluctuation of two root-promoting rhizobacteria in Eucalyptus globulus cuttings. World J Microbiol Biotechnol 2012; 28:2003-14. [PMID: 22806022 DOI: 10.1007/s11274-012-1003-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Accepted: 01/06/2012] [Indexed: 11/29/2022]
Abstract
Vegetative propagation by stem cuttings and mini-cuttings has been used worldwide for growing Eucalyptus plants. However, clones and hybrids of this plant present a great variability in their rooting capacity, apart from a gradual decrease in the rooting potential due to the ontogenetic age of the mother plant. Several studies have demonstrated that some bacteria promote plant growth and rooting through the action of direct and indirect mechanisms that are not still completely clear. Considering this, the objective of this study was to assess the production of auxins, abscisic acid and siderophores in Bacillus subtilis and Stenotrophomona maltophilia, which in previous studies increased rooting of E. globulus cuttings. Additionally, the population of these bacteria in the rhizosphere, superficial tissues of the stem-base and callus of the mini-cuttings was identified, and quantified by real-time PCR. Only S. maltophilia produced IAA in the presence of tryptophan; none of the bacterial strains produced ABA, but both produced siderophores. A comparative analysis of the separation profiles showed that there is a diverse microbial community in the rhizosphere, and only S. maltophilia was capable of keeping its population at a density of 2.03 × 10(7) cells/mg in different tissues of the mini-cuttings. The results would indicate that the rooting stimulus in E. globulus could be related to the action of one or several mechanisms such as the production of auxins and siderophores, and it could also be associated with the ability of bacteria to stay in the rhizosphere or in plant callus tissues.
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Affiliation(s)
- Katy Díaz Peralta
- Forest Pathology Laboratory, Biotechnology Center, University of Concepción, Concepción, Chile.
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Konings A. Gravitropism of roots: an evaluation of progress during the last three decades. BOTANICA ACTA : BERICHTE DER DEUTSCHEN BOTANISCHEN GESELLSCHAFT = JOURNAL OF THE GERMAN BOTANICAL SOCIETY 1995; 44:195-223. [PMID: 11541285 DOI: 10.1111/j.1438-8677.1995.tb00781.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The response of plant roots to gravity has fascinated many botanists since the early days of plant physiology and much research has been devoted to the elucidation of the sequence of events between the physical reception of gravity and the visible growth response. In the last few decades the ideas on the graviresponse of roots have changed profoundly and much progress has been made in understanding parts of the process. One of the reasons for writing this review was my curiosity to know what has happened since the time I myself was involved in the study of root geotropism, as it was called, about 30 years ago. Some excellent reviews have appeared since then, e.g. Audus (1975), Jackson & Barlow (1981) and Moore & Evans (1986), which were more restricted in scope and, moreover, there have been several fascinating developments. The aim of this review is to discuss briefly all aspects of the graviresponse of roots and the progress made in understanding during the last three decades. Some data on other plant organs are included where appropriate.
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Affiliation(s)
- A Konings
- Department of Plant Ecology and Evolutionary Biology, Utrecht University, The Netherlands
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Ravishankar KV, Uma Shaanker R, Ganeshaiah KN. War of hormones over resource allocation to seeds: Strategies and counter-strategies of offspring and maternal parent. J Biosci 1995. [DOI: 10.1007/bf02711584] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Pilet PE. Differential growth and hormone redistribution in gravireacting maize roots. ENVIRONMENTAL AND EXPERIMENTAL BOTANY 1989; 29:37-45. [PMID: 11541034 DOI: 10.1016/0098-8472(89)90037-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
When growing roots are placed in a horizontal position gravity induces a positive curvature. It is classically considered to be the consequence of a faster elongation rate by the upper side compared to the lower side. A critical examination indicates that the gravireaction is caused by differential cell extension depending on several processes. Some of the endogenous regulators which may control the growth and gravitropism of elongating roots are briefly presented. The growth inhibitors produced or released from the root cap move preferentially in a basipetal direction and accumulate in the lower side of the elongation zone of horizontally maintained roots. The identity of these compounds is far from clear, but one of these inhibitors could be abscisic acid (ABA). However, indol-3y1 acetic acid (IAA) is also important for root growth and gravitropism. ABA may interact with IAA. Two other aspects of root cell extension have also to be carefully considered. An elongation gradient measured from the tip to the base of the root was found to be important for the growth of both vertical and horizontal gravireactive roots. It was changed significantly during the gravipresentation and can be considered as the origin of the differential elongation. Sephadex beads have been used as both growth markers and as monitors of surface pH changes when they contain some pH indicator. This technique has shown that the distribution of cell extension along the main root axis is related to a pH gradient, the proton efflux being larger for faster growing parts of roots. A lateral movement of calcium is obtained when Ca2+ is applied across the tips of horizontally placed roots with a preferential transport towards the lower side. Endogenous calcium, which may accumulate inside the endoplasmic reticulum of some cap cells, may also act in the gravireception. These observations and several others strongly suggest that calcium may play an essential role in controlling root growth and several steps of the root gravireaction.
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Affiliation(s)
- P E Pilet
- Institute of Plant Biology and Physiology, University of Lausanne, Switzerland
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CHEN SHINLIN, BREENE WILLIAMM, SCHOWALTER CRAIG. EFFECTS OF GROWTH REGULATORS ON YIELD AND QUALITY OF MUNGBEAN SPROUTS GROWN IN AN AUTOMATICALLY CONTROLLED CHAMBER. J FOOD QUALITY 1987. [DOI: 10.1111/j.1745-4557.1987.tb00814.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Pilet PE, Hervé R, Senn A. Zeta potential of protoplasts from gravireacting maize roots. PLANTA 1984; 162:17-22. [PMID: 24253942 DOI: 10.1007/bf00397415] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/1983] [Accepted: 02/25/1984] [Indexed: 06/02/2023]
Abstract
Protoplasts were isolated from cortical cells of the elongating zone of maize (Zea mays L. cv. LG 11) roots and submitted to microelectrophoresis. Significant and transient differences in zeta potential between protoplasts from upper and lower root sides were compared with the gravireaction and the differential elongation of these roots. The maximum difference in the zeta potential was obtained between protoplasts from the upper and lower cortical cells after 90 min, exactly the time of gravipresentation for which the maximum rate of gravireaction was observed. In addition, this almost corresponded to the time for which the difference between the elongation rates of upper and lower sides of the extending zone began to increase. Consequently, the changes in the charges of the plasmalemma of the cortical cells from the growing part of roots could be more or less directly related to the root graviresponse.
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Affiliation(s)
- P E Pilet
- Bâtiment de Biologie, Institute of Plant Biology and Physiology of the University, CH-1015, Lausanne, Switzerland
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Pilet P, Bernasconi P. Rubus hispidus callus cultured in vitro and endogenous lysozyme: Growth processes. ACTA ACUST UNITED AC 1984. [DOI: 10.1016/0304-4211(84)90188-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Is plant development regulated by changes in the concentration of growth substances or by changes in the sensitivity to growth substances? Trends Biochem Sci 1983. [DOI: 10.1016/0968-0004(83)90359-6] [Citation(s) in RCA: 100] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Rivier L, Léonard JF, Cottier JP. Rapid effect of osmotic stress on the content and exodiffusion of abscisic acid in Zea mays roots. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/0304-4211(83)90049-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Mulkey TJ, Evans ML, Kuzmanoff KM. The kinetics of abscisic acid action on root growth and gravitropism. PLANTA 1983; 157:150-157. [PMID: 24264069 DOI: 10.1007/bf00393649] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/1982] [Accepted: 10/29/1982] [Indexed: 06/02/2023]
Abstract
Using an auxanometer and time-lapse cinematography we have studied the timing of abscisic acid (ABA) effects on elongation, gravitropic curvature, and hydrogen-ion efflux in several cultivars of maize (Zea mays L.). The effect of high concentrations (e.g. 0.1 mM) of ABA on root elongation is triphasic, including 1) a period of promotion lasting approximately 12 h, 2) a subsequent period of increasing inhibition lasting approximately 12h, and 3) gradual recovery to a rate within approximately 80% of the control rate. With lower concentrations of ABA (e.g. 0.1 μM) only the transient promotive phase is seen. Abscisic acid enhances ethylene biosynthesis in roots of maize but suppression of ethylene biosynthesis does not prevent the long-term inhibitory action of ABA on growth. Application of ABA (0.1 mM) to the upper surface of horizontally placed roots accelerates positive gravitropism. Application of ABA to the lower surface retards gravitropism and in some cases causes the roots to curve upward against the direction of gravity. These observations are consistent with our finding that the initial effect of ABA on root elongation is stimulatory. Since root gravitropism is rapid enough to be completed within the stimulatory phase of ABA action, the data argue against hypotheses of gravitropism based upon accumulation of ABA to inhibitory levels on the lower side of a hirizontal root.
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Affiliation(s)
- T J Mulkey
- Department of Botany, Ohio State University, 43210, Columbus, OH, USA
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Beffa R, Pilet PE. Growth and Gravireaction of Illuminated Maize Roots: Kinetic Analyses. ACTA ACUST UNITED AC 1982. [DOI: 10.1016/s0044-328x(82)80146-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Chanson A, Pilet PE. Transport and metabolism of [2(14)-C]abscisic acid in maize root. PLANTA 1982; 154:556-561. [PMID: 24276351 DOI: 10.1007/bf00403000] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/1981] [Accepted: 02/08/1982] [Indexed: 06/02/2023]
Abstract
The tips of intact maize (cv. LG 11) roots, maintained vertically, were pretreated with a droplet of buffer solution or a bead of anion exchange resin, both containing [2(14)-C]abscisic acid (ABA). A significant basipetal ABA movement was observed and two metabolites of ABA (possibly phaseic acid and dihydrophaseic acid) were found. ABA pretreatment enhanced the gravireaction of 10 mm apical root segments kept both in the dark and in the light. The possibility that ABA could be one of the endogenous growth inhibitors produced or released by the cap cells is discussed.
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Affiliation(s)
- A Chanson
- Institut de Biologie et de Physiologie Végétales de l'Université, 6 Place de la Riponne, CH-1005, Lausanne, Switzerland
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Pilet PE, Rivier L. Abscisic acid distribution in horizontal maize root segments. PLANTA 1981; 153:453-458. [PMID: 24275816 DOI: 10.1007/bf00394985] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/1981] [Accepted: 09/25/1981] [Indexed: 06/02/2023]
Abstract
Using gas chromatography-mass spectrometry (GC/MS) techniques of analyses, it has been found that endogenous abscisic acid (ABA) becomes asymmetrically distributed in the elongation zone of horizontal Zea mays (cv. LG 11) roots which are showing a positive gravitropic response. There is a relative increase in the ABA content of the lower half and a concomitant decrease for the upper half in such roots. Asymmetric distribution of ABA is also detected in the elongation zone of half-decapped roots.
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Affiliation(s)
- P E Pilet
- Institut de Biologie et de Physiologie Végétales, Université de Lausanne, 6 Place de la Riponne, CH-1005, Lausanne, Switzerland
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