Some cellular and molecular properties of abscisic acid: its particular involvement in growing plant roots

Pilet, Paul

doi:10.1007/s000180050213

Cited by 11 publications

(5 citation statements)

References 127 publications

(148 reference statements)

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“…It has been suggested that ABA may inhibit directly or indirectly cell extension in slow‐growing roots and in the lower side of the root elongation zone during gravitropic bending (Fig. 1; Audus 1983; Pilet 1991, 1998). Accordingly, slightly higher levels of IAA and ABA were found in the lower than in the upper side of maize roots during positive gravireaction (Pilet 1991).…”

Section: Possible Role In Auxin‐regulated Root Gravireactionmentioning

confidence: 99%

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Ethylene‐triggered abscisic acid: A principle in plant growth regulation?

Großmann¹,

Hansen²

2001

Physiologia Plantarum

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The application of auxins to sensitive plant species or their phenomenon in the normal plant growth regulation. Our own results and a reappraisal of the literature indicate that ethyl-overproduction in transgenic plants stimulates ethylene biosynthesis via induction of 1-aminocyclopropane-1-carboxylic acid ene-induced ABA may, indeed, play a role in natural physiological phenomena, such as root gravireaction and suppression (ACC) synthase. Recent studies with auxin herbicides and indole-3-acetic acid (IAA) have revealed that auxin-stimulated of lateral bud growth in apical dominance. In addition, it would be worthwhile to investigate whether ethylene-triggered ethylene triggers an increase in the biosynthesis of abscisic acid (ABA), which then functions as a second messenger,ABA is involved in other processes which coincide with a strong stimulation of ethylene biosynthesis, such as growth leading to growth inhibition and senescence. This raises the inhibition induced by cytokinins and senescence elicited under question of whether ethylene-triggered ABA is restricted to stress conditions. the action of auxin herbicides or whether it is a widespread

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Section: Possible Role In Auxin‐regulated Root Gravireactionmentioning

confidence: 99%

“…comm.). The activity of this inhibitor‐ β is ascribed to ABA (Pilet 1998). This indicates that auxin moving down from the apex induces high ethylene and ABA levels in the lateral buds, which prevent bud outgrowth.…”

Section: Possible Role In Growth Inhibition Of Lateral Budsmentioning

confidence: 99%

Ethylene‐triggered abscisic acid: A principle in plant growth regulation?

Großmann¹,

Hansen²

2001

Physiologia Plantarum

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“…Bertell and Eliasson, 1992; Cary et al, 1995), ethylene (e.g. Cary et al, 1995, abscisic acid (for review, see Pilet, 1998), and jasmonate (Staswick et al, 1992) all have the potential to inhibit root elongation, although at the same time, other processes such as auxin-induced lateral root formation (Zolman et al, 2000) and auxin-or ethylene-induced root hair elongation (Pitts et al, 1998) can occur.* Corresponding author; e-mail muessig@mpimp-golm.mpg.de; fax 49 -331-5250.Article, publication date, and citation information can be found at www.plantphysiol.org/cgi …”

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confidence: 99%

Brassinosteroids Promote Root Growth in Arabidopsis

2003

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Although brassinosteroids (BRs) are known to regulate shoot growth, their role in the regulation of root growth is less clear. We show that low concentrations of BRs such as 24-epicastasterone and 24-epibrassinolide promote root elongation in Arabidopsis wild-type plants up to 50% and in BR-deficient mutants such as dwf1-6 (cbb1) and cbb3 (which is allelic to cpd) up to 150%. The growth-stimulating effect of exogenous BRs is not reduced by the auxin transport inhibitor 2,3,5-triidobenzoic acid. BR-deficient mutants show normal gravitropism, and 2,3,5-triidobenzoic acid or higher concentrations of 2,4-dichlorophenoxyacetic acid and naphtaleneacetic acid inhibit root growth in the mutants to the same extent as in wild-type plants. Simultaneous administration of 24-epibrassinolide and 2,4-dichlorophenoxyacetic acid results in largely additive effects. Exogenous gibberellins do not promote root elongation in the BR-deficient mutants, and the sensitivity to the ethylene precursor 1-aminocyclopropane-1-carboxylic acid is not altered. Thus, the root growth-stimulating effect of BRs appears to be largely independent of auxin and gibberellin action. Furthermore, we analyzed BR interactions with other phytohormones on the gene expression level. Only a limited set of auxin-and ethylene-related genes showed altered expression levels. Genes related to other phytohormones barely showed changes, providing further evidence for an autonomous stimulatory effect of BR on root growth.Recently, the presence of brassinosteroids (BRs) was demonstrated in Arabidopsis, maize (Zea mays), pea (Pisum sativum), and tomato (Lycopersicon esculentum) roots (Kim et al., 2000;Yokota et al., 2001; Bancos et al., 2002;Shimada et al., 2003). In general, the levels of BRs such as castasterone in roots are clearly below the concentrations in shoots, and roots appear to require active BRs to a much lesser extent than shoots. In agreement with the detection of BRs in roots, genes involved in BR biosynthesis (Bancos et al., 2002) and genes involved in BR signaling (Friedrichsen et al., 2000) are expressed in roots. These findings suggest that BRs are important regulatory substances in roots.Previous studies merely analyzed the effects of exogenously supplied BRs on root growth. To this end, different systems such as shoot cuttings (analysis of adventitious root formation), cultured excised roots, root segments, and seedling roots (Roddick and Guan, 1991) were used. In general, BRs inhibit adventitious root formation even though root induction has also been reported occasionally (e.g. Sathiyamoorthy and Nakamura, 1990). Root cuttings were used widely to analyze BR effects on main root elongation and lateral root formation. This system can provide valuable hints in determining whether roots respond directly to BRs or indirectly via primary effects on the shoot. Both inhibitory effects (e.g. Guan and Roddick, 1988;Roddick et al., 1993) and stimulating effects (e.g. Romani et al., 1983) were observed. However, potential cross talk with other phytohormone...

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“…Existem alguns trabalhos que indicam um efeito estimulante no alongamento celular promovido pelo ácido abscísico (PILET, 1998). Gaither et al (1975) demonstraram que o crescimento radicular de Pisum sativum foi aumentado em 29% quando houve aplicação de 1 µM de ácido abscísico.…”

Section: Dosesunclassified

Bioestimulantes contendo silício e micronutrientes aplicados via foliar em arroz de sequeiro

Vasconcelos¹

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Agradeço primeiramente a Deus, pois só Ele nos conhece e sabe o que passa dentro de nós, nos dando força para prosseguimos com fé e perseverança. Obrigada meu Pai, por sempre estar ao meu lado, me guiando e protegendo, pelo Seu amor incondicional pude concluir mais esta etapa da minha vida. Agradeço especialmente a minha filha Ana Clara-luz e alegria da minha vidapelo amor e compreensão nos momentos em que a dedicação aos estudos foi exclusiva, agradeço pela paciência e força a mim despendida. Seu amor, companheirismo e simplesmente sua existência foram minha inspiração para que eu conseguisse alcançar essa realização. Não tenho palavras para descrever o quanto sou grata por ter você em minha vida. Aos meus pais, Marcília e Teodulo, ao meu irmão Daniel e a toda minha família que, com muito carinho, me apoiaram, sonharam comigo e não mediram esforços para me ajudar no que fosse preciso. Ao Thiago que foi um anjo que Deus me enviou e me ajudou imensamente desde que passou a fazer parte da minha vida, dando todo o apoio que necessitava em todos os momentos, todo carinho, amor, respeito e companheirismo e por tornar minha vida mais fácil e cada dia mais feliz. Seu apoio foi fundamental para que eu chegasse até aqui. Ao professor Gaspar, por sua competente orientação, assim como pela constante disposição em dirimir dúvidas, pelo auxílio, apoio e atenção dispensada neste momento tão importante da minha vida profissional. Ao professor Lísias, pela colaboração e excelente coorientação, apoio, compreensão, incentivo e disposição em ensinar. Ao professor Hamilton, pelo auxílio, orientação, disponibilidade e pelas valiosas contribuições no desenvolvimento deste trabalho. À Timac Agro e à gerente de marketing de produtos estratégicos Fernanda Weber, pelo apoio, incentivo e colaboração nesse projeto. À professora Regina, pela frequente orientação, convívio, apoio, amizade, incentivo e auxílio em meu crescimento profissional. À professora Denise, pela disposição, atenção e orientação, bem como por não medir esforços para auxiliar e sanar dúvidas, estando sempre disposta a ajudar e contribuir para o meu crescimento profissional. Aos professores Stephan e Maria Amélia, pelo auxílio dispensado em momentos cruciais de desenvolvimento deste trabalho. Ao MSc. Diego Tolentino, pelo companheirismo e apoio nas análises estatísticas. Ao Grupo de Pesquisa "Silício na Agricultura" pelo apoio dispendido, especialmente ao colega Bruno Guimarães. Agradeço também aos meus amigos e colegas que sempre torceram por mim e me apoiaram. Obrigada pelo companheirismo e amizade de vocês. À Universidade Federal de Uberlândia, ao Instituto de Ciências Agrárias e professores pela contribuição para minha formação. À CAPES pela concessão de bolsa durante todo o período de realização do mestrado e ao CNPq e FAPEMIG pelo apoio financeiro e incentivo à pesquisa. A todos que de alguma forma me ajudaram e contribuíram para o meu crescimento e formação profissional.

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Some cellular and molecular properties of abscisic acid: its particular involvement in growing plant roots

Cited by 11 publications

References 127 publications

Ethylene‐triggered abscisic acid: A principle in plant growth regulation?

Ethylene‐triggered abscisic acid: A principle in plant growth regulation?

Brassinosteroids Promote Root Growth in Arabidopsis

Bioestimulantes contendo silício e micronutrientes aplicados via foliar em arroz de sequeiro

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