Structure-activity differences between indoleacetic acid auxins on pea and wheat

Katekar, Gerard F.; Geissler, Art E.

doi:10.1016/s0031-9422(00)80052-7

Cited by 39 publications

(20 citation statements)

References 15 publications

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“…While the concentration of IAA required to inhibit short-term root growth by 50% (I 50 ) was similar for roots of maize and V. mungo (0.01 lM), the IC 50 for inhibition of growth by 4,7-dichloroindoleacetic acid was much higher for roots of maize than for roots of V. mungo (Table 1). These grass/dicot species differences measured in roots fully correspond to the differences reported by Katekar and Geissler (1983) where 4,6-dichloroindoleacetic acid and 4,7-dichloroindoleacetic acid promoted the growth of pea internode segments much more effectively than growth of wheat coleoptile segments.…”

Section: Resultssupporting

confidence: 85%

“…In the same series of studies, however, Å berg (1956) made the conspicuous observation that the auxin 2-naphthoxyacetic acid (2-NOA) was a potent inhibitor of the elongation of roots of the dicotyledonous plants, flax and cress, but had a much weaker effect on roots of the monocotyledonous plant, wheat. In a related context, Katekar and Geissler (1983) found that 4,6-dichloroindoleacetic acid and 4,7-dichloroindoleacetic acid promoted the growth of excised pea stem segments much more effectively than excised wheat coleoptile segments. In contrast, compounds such as IAA itself as well as the 2-, 4-, and 5-monochlorinated derivatives of IAA showed no differing activities on pea and wheat.…”

Section: Introductionmentioning

confidence: 97%

“…Although indole-3-acetic acid (IAA) is the major naturally occurring auxin, numerous compounds structurally similar to IAA have been tested in both cell elongation (Jo¨nsson 1955;Å berg 1956) and auxin transport bioassays (Hertel et al 1969;Delbarre et al 1996;Parry et al 2001). From these studies indirect conclusions have been ventured concerning the ligand specificity of the corresponding receptor and transporter proteins (Å berg 1951;Katekar and Geissler 1983).…”

Section: Introductionmentioning

confidence: 99%

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Species differences in ligand specificity of auxin-controlled elongation and auxin transport: comparing Zea and Vigna

Zhao¹,

Hertel

Ishikawa³

et al. 2002

Planta

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The plant hormone auxin affects cell elongation in both roots and shoots. In roots, the predominant action of auxin is to inhibit cell elongation while in shoots auxin, at normal physiological levels, stimulates elongation. The question of whether the primary receptor for auxin is the same in roots and shoots has not been resolved. In addition to its action on cell elongation in roots and shoots, auxin is transported in a polar fashion in both organs. Although auxin transport is well characterized in both roots and shoots, there is relatively little information on the connection, if any, between auxin transport and its action on elongation. In particular, it is not clear whether the protein mediating polar auxin movement is separate from the protein mediating auxin action on cell elongation or whether these two processes might be mediated by one and the same receptor. We examined the identity of the auxin growth receptor in roots and shoots by comparing the response of roots and shoots of the grass Zea mays L. and the legume Vigna mungo L. to indole-3-acetic acid, 2-naphthoxyacetic acid, 4,6-dichloroindoleacetic acid, and 4,7-dichloroindoleacetic acid. We also studied whether or not a single protein might mediate both auxin transport and auxin action by comparing the polar transport of indole-3-acetic acid and 2-naphthoxyacetic acid through segments from Vigna hypocotyls and maize coleoptiles. For all of the assays performed (root elongation, shoot elongation, and polar transport) the action and transport of the auxin derivatives was much greater in the dicots than in the grass species. The preservation of ligand specificity between roots and shoots and the parallels in ligand specificity between auxin transport and auxin action on growth are consistent with the hypothesis that the auxin receptor is the same in roots and shoots and that this protein may mediate auxin efflux as well as auxin action in both organ types.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Species differences in ligand specificity of auxin-controlled elongation and auxin transport: comparing Zea and Vigna

Zhao¹,

Hertel

Ishikawa³

et al. 2002

Planta

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show abstract

“…Reinecke et al (1995) found that exogenous 4-C1-IAA and, to a lesser extent, 5-Cl-IAA, promoted pericarp growth, whereas IAA, 6-and 7-chloro-, and 4-, 5-, 6-, and 7-fluoro-substituted IAA were inactive or inhibitory. In contrast, in pea stems and wheat coleoptile assays, IAA, 4-, 5-, 6-, and '/-Cl-IAA, and 5-F-IAA were a11 active, although maximum activity was observed at different concentrations (Hoffmann et al, 1952;Katekar and Geissler, 1983).…”

Section: Dlscusslonmentioning

confidence: 99%

Seed and Hormonal Regulation of Gibberellin 20-Oxidase Expression in Pea Pericarp

1997

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“…[4][5][6][7][8][9][10][11] Its synthesis and biological activities and those of its esters also have been reported. 12,13) Root formation-promoting activities of 4-Cl-IAA and its esters are much higher than the activity of 4-(3-indole)butyric acid (IBA), the active ingredient of a commercially available root formation-promoting agent, the respective promoting activities of 4-Cl-IAA and its ethyl ester being 3.3 and 3.5 times that of IBA for Serissa japonica.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and plant growth-regulating activities of L-lactic acid derivatives of 4-chloroindole-3-acetic acid

et al. 2006

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Introduction4-Chloroindole-3-acetic acid (4-Cl-IAA), isolated from immature seeds of Pisum sativum, [1][2][3] has strong hormonal activity as compared to IAA. [4][5][6][7][8][9][10][11] Its synthesis and biological activities and those of its esters also have been reported. 12,13) Root formation-promoting activities of 4-Cl-IAA and its esters are much higher than the activity of 4-(3-indole)butyric acid (IBA), the active ingredient of a commercially available root formation-promoting agent, the respective promoting activities of 4-Cl-IAA and its ethyl ester being 3.3 and 3.5 times that of IBA for Serissa japonica. 12) We are interested in massproducing tree saplings for reforestation by means of compounds that have strong root formation-promoting activity. We reported that 4-Cl-IAA, 5,6-dichoroindole-3-acetic acid (5,6-Cl 2 -IAA) and their ester derivatives are promising candidates for root formation promoters.14-16) They strongly promote the root formation of tree cuttings by both the soaking and spraying methods. In particular, root formation by spraying has an important advantage because it is easy to massproduce tree saplings for reforestation by that method.16) In root formation by Serissa plants, 4-Cl-IAA esters that bear one to three carbons in the alcohol part of the molecule also have strong root formation-promoting and other plant growthregulating activities.12,13) Our interest is in more polar derivatives bearing three carbons among esters with one to three carbons in the alcohol part of the 4-Cl-IAA ester. We selected lactic acid derivatives of 4-Cl-IAA, polar three-carbon derivatives that bond directly to 4-Cl-IAA, as new candidates for plant growth regulators. The synthesis and plant growth-regulating activities of these L-lactic acid derivatives (1a-1k) of 4-Cl-IAA are reported. The ester derivatives of 4-chloroindole-3-acetic acid (4-Cl-IAA) with L-lactic acid and L-lactic acid esters were synthesized by two schemes from 4-Cl-IAA and L-lactic acid or its esters. Their biological activities were determined by three bioassays (hypocotyl growth inhibition in Chinese cabbage (Brassica pekinensis cv. Kinshu), hypocotyl swelling and lateral root formation in black gram (Vigna mungo (L.) Hepper), and adventitious root formation in black gram cuttings). All the L-lactic acid ester derivatives had strong activities in the three bioassays, but their activities were somewhat weaker than those of 4-Cl-IAA in the first two bioassays. Root formation activity of some esters in cuttings was higher than, or the same as, that of 4-Cl-IAA. At 1ϫ10 Ϫ5 M, roots induced by the esters were about 2 to 4 times those of 4-(3-indole)butyric acid (IBA). Unexpectedly, the free lactic acid derivative had the weakest activity of all the lactic acid derivatives tested in all bioassays. Synthesis and plant growth-regulating activities of L-lactic acid derivatives of 4-chloroindole-3-acetic acid

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Structure-activity differences between indoleacetic acid auxins on pea and wheat

Cited by 39 publications

References 15 publications

Species differences in ligand specificity of auxin-controlled elongation and auxin transport: comparing Zea and Vigna

Species differences in ligand specificity of auxin-controlled elongation and auxin transport: comparing Zea and Vigna

Seed and Hormonal Regulation of Gibberellin 20-Oxidase Expression in Pea Pericarp

Synthesis and plant growth-regulating activities of L-lactic acid derivatives of 4-chloroindole-3-acetic acid

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