The effect of brassinosteroid on auxin‐induced ethylene production by etiolated mung bean segments

Arteca, Richard N.; Tsai, De‐Sheng ‐S; Schlagnhaufer, Carl D.; Mandava, N. Bhushan

doi:10.1111/j.1399-3054.1983.tb06277.x

Cited by 81 publications

(48 citation statements)

References 19 publications

(10 reference statements)

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“…It is known that epidermal cell death in nodes correlates with root emergence in rice and it is mediated by ethylene (Steffens and Sauter, 2009). Since ethylene biosynthesis is activated by BR (Arteca et al, 1983;Yi et al, 1999), this observation may be a BR effect mediated via ethylene biosynthesis. Moreover, most of BU1:OX plants displayed severe sterility.…”

Section: Discussionmentioning

confidence: 95%

BRASSINOSTEROID UPREGULATED1, Encoding a Helix-Loop-Helix Protein, Is a Novel Gene Involved in Brassinosteroid Signaling and Controls Bending of the Lamina Joint in Rice

et al. 2009

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(T.A.) Brassinosteroids (BRs) are involved in many developmental processes and regulate many subsets of downstream genes throughout the plant kingdom. However, little is known about the BR signal transduction and response network in monocots. To identify novel BR-related genes in rice (Oryza sativa), we monitored the transcriptomic response of the brassinosteroid deficient1 (brd1) mutant, with a defective BR biosynthetic gene, to brassinolide treatment. Here, we describe a novel BR-induced rice gene BRASSINOSTEROID UPREGULATED1 (BU1), encoding a helix-loop-helix protein. Rice plants overexpressing BU1 (BU1:OX) showed enhanced bending of the lamina joint, increased grain size, and resistance to brassinazole, an inhibitor of BR biosynthesis. In contrast to BU1:OX, RNAi plants designed to repress both BU1 and its homologs displayed erect leaves. In addition, compared to the wild type, the induction of BU1 by exogenous brassinolide did not require de novo protein synthesis and it was weaker in a BR receptor mutant OsbriI (Oryza sativa brassinosteroid insensitive1, d61) and a rice G protein alpha subunit (RGA1) mutant d1. These results indicate that BU1 protein is a positive regulator of BR response: it controls bending of the lamina joint in rice and it is a novel primary response gene that participates in two BR signaling pathways through OsBRI1 and RGA1. Furthermore, expression analyses showed that BU1 is expressed in several organs including lamina joint, phloem, and epithelial cells in embryos. These results indicate that BU1 may participate in some other unknown processes modulated by BR in rice.Brassinosteroids (BRs) are essential growth regulators, involved in many physiological processes, e.g. cell expansion and division, vascular bundle differentiation, skotomorphogenesis, flowering, senescence, abiotic, and biotic stresses (Szekeres et al

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Section: Discussionmentioning

confidence: 95%

BRASSINOSTEROID UPREGULATED1, Encoding a Helix-Loop-Helix Protein, Is a Novel Gene Involved in Brassinosteroid Signaling and Controls Bending of the Lamina Joint in Rice

et al. 2009

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“…Moreover, the BR-induced bending and inclination can be inhibited by high concentration of IAA transport inhibitor 2,3,5-triiodobenzoic acid (Cao and Chen, 1995;Takeno and Pharis, 1982). The ethylene production by etiolated mung bean hypocotyls is also synergistically promoted by BRs and auxin (Arteca et al, 1983). These physiological observations suggest a cross-talk between BRs and auxin.…”

mentioning

confidence: 86%

Brassinosteroids Interact with Auxin to Promote Lateral Root Development in Arabidopsis

et al. 2004

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Plant hormone brassinosteroids (BRs) and auxin exert some similar physiological effects likely through their functional interaction, but the mechanism for this interaction is unknown. In this study, we show that BRs are required for lateral root development in Arabidopsis and that BRs act synergistically with auxin to promte lateral root formation. BR perception is required for the transgenic expression of the β-glucuronidase gene fused to a synthetic auxin-inducible promoter (DR5::GUS) in root tips, while exogenous BR promotes DR5::GUS expression in the root tips and the stele region proximal to the root tip. BR induction of both lateral root formation and DR5::GUS expression is suppressed by the auxin transport inhibitor N-(1-naphthyl) phthalamic acid. Importantly, BRs promote acropetal auxin transport (from the base to the tip) in the root. Our observations indicate that BRs regulate auxin transport, providing a novel mechanism for hormonal interactions in plants and supporting the hypothesis that BRs promote lateral root development by increasing acropetal auxin transport.

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“…Brassinosteroids are known to act synergistically with auxin to stimulate cell elongation (Katsumi, 1985;Sasse, 1990) and ethylene production (Arteca et al, 1983), suggesting that their effects are mediated by auxin (Takeno and Pharis, 1982) or that brassinosteroids enhance tissue sensitivity to auxin (Mandava, 1988). Despite indirect evidence that the mode of action of brassinosteroids is different from that of auxin (Katsumi, 1991), there are indications that brassinosteroids may somehow influence the endogenous auxin content.…”

Section: Introductionmentioning

confidence: 97%

“…These hormones affect several biological processes, including stem elongation, pollen tube growth, leaf bending, root growth, and xylem formation (Yokota, 1997). These developmental activities are mainly associated with ATPase activity (Cerana et al, 1983), synthesis of 1-aminocyclopropane-1-carboxylic acid synthase (Arteca et al, 1983), alteration in microtubule orientation (Mayumi and Shibaoka, 1995), and modification of cell walls (Zurek et al, 1994). Clouse and Zurek (1991) observed that exogenously supplied brassinolide, the most active brassinosteroid, promoted both tracheary element differentiation and cell division in cultured tuber explants.…”

Section: Introductionmentioning

confidence: 99%

Application of brassinosteroid to Tabebuia alba (Bignoniaceae) plants

Ono

Nakamura

Machado

et al. 2000

Rev. Bras. Fisiol. Veg.

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-The objective of this study was to observe the effects of brassinosteroid, gibberelin, and auxin application on the development and foliar anatomy of Tabebuia alba (Cham.) Sandw. seedlings. T. alba seedlings were grown in plastic bags with fertilized soil and treated with the following: 1-water (control); 2-brassinolide (BR 1 ) 0.104 mM; 3-BR 1 0.208 mM; 4-3-indoleacetic acid (IAA) 0.2854 mM; 5-IAA 0.5708 mM; 6-GA 3 (gibberellin A 3 ) 0.1443 mM; 7-GA 3 0.2887 mM; 8-GA 3 0.072 mM + IAA 0.1427 mM; 9-GA 3 0.1443 mM + IAA 0.2854 mM; 10-GA 3 0.072 mM + BR 1 0.052 mM; and 11-GA 3 0.1443 mM + BR 1 0.104 mM. Plant height and petiole length were measured before the treatments and 21 days after application of the growth regulators. These data allowed the calculation of stem and petiole growth rates. The results showed that GA 3 + brassinolide produced the highest stem and petiole growth rates and brassinolide application stimulated petiole growth but not stem growth. The anatomical study of leaves showed alterations in blade and petiole thickness, palisade and spongy parenchyma height, and epidermis cells. ADITIONAL INDEX TERMS:Tabebuia alba L., brassinosteroids, GA 3 , auxin, growth. APLICAÇÃO DE BRASSINOESTERÓIDE EM PLANTAS DE IPÊ (Tabebuia alba)RESUMO -O objetivo deste estudo foi de se verificar o efeito da aplicação de brassinoesteróide, giberelina e auxina no desenvolvimento e anatomia foliar de plantulas jovens de Tabebuia alba (Cham.) Sandw. Para tanto, utilizaram-se plântulas de ipê de 104 dias cultivadas em saco plástico com capacidade para 1 litro contendo solo adubado. Os tratamentos aplicados via pulverização foliar foram: 1 -água, 2 -brassinólide (BR 1 ) 0,104 mM, 3 -BR 1 0,208mM, 4 -ácido indolil-3-acético (IAA) 0,285mM, 5 -IAA 0,5708mM, 6 -GA 3 (ácido giberélico) 0,1443mM, 7 -GA 3 0,2887mM, 8 -GA 3 0,072mM + IAA 0,1427mM, 9 -GA 3 0,1443mM + IAA 0,285mM, 10 -GA 3 0,072mM + BR1 0,052mM e 11 -GA 3 0,1443nM + BR1 0,208mM. As seguintes observações foram realizadas antes da aplicação dos tratamentos e 21 dias após: altura da planta e comprimento do pecíolo. Com base nesses dados, foi calculada a taxa de crescimento do caule e do pecíolo. Pelos resultados, constatou-se que a aplicação de brassinólide estimula o crescimento do pecíolo, mas não do caule. Os estudos anatômicos das folhas mostraram alterações na espessura do limbo e pecíolo, na altura do parênquima paliçádico e lacunoso e nas células da epiderme.

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The effect of brassinosteroid on auxin‐induced ethylene production by etiolated mung bean segments

Cited by 81 publications

References 19 publications

BRASSINOSTEROID UPREGULATED1, Encoding a Helix-Loop-Helix Protein, Is a Novel Gene Involved in Brassinosteroid Signaling and Controls Bending of the Lamina Joint in Rice

BRASSINOSTEROID UPREGULATED1, Encoding a Helix-Loop-Helix Protein, Is a Novel Gene Involved in Brassinosteroid Signaling and Controls Bending of the Lamina Joint in Rice

Brassinosteroids Interact with Auxin to Promote Lateral Root Development in Arabidopsis

Application of brassinosteroid to Tabebuia alba (Bignoniaceae) plants

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