Auxin-Antiauxin Interaction at High Auxin Concentrations.

Foster, Robert J.; McRae, D. Harold; Bonner, James

doi:10.1104/pp.30.4.323

Cited by 33 publications

(11 citation statements)

References 4 publications

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“…PCIB also distinctly interfered with the effect of NAA, while the auxin effect strongly depended on PCIB concentration (data not shown). Consistent with results of Foster et al, 58 the inhibitory effect of auxin on growth in etiolated seedlings can only be overcome by certain optimal concentrations of PCIB. Very importantly, PCIB had no significant effect on elongation of 3394 (Figs.…”

Section: Discussionsupporting

confidence: 79%

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Development of Erect Leaves in a Modern Maize Hybrid is Associated with Reduced Responsiveness to Auxin and Light of Young Seedlings in vitro

Fellner

Ford

Volkenburgh

2006

Plant Signaling & Behavior

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Modern corn (Zea mays L.) varieties have been selected for their ability to maintain productivity in dense plantings. We have tested the possibility that the physiological consequence of the selection involves changes in responsiveness to light and auxin.Etiolated seedlings of two older corn hybrids 307 and 3306 elongated significantly more than seedlings of a modern corn hybrid 3394. The level of endogenous auxin and activity of PAT in 307 and 3394 were similar. Hybrid 3394 shows resistance to auxinand light-induced responses at the seedling, cell and molecular levels. Intact 3394 plants exhibited less responsiveness to the inhibitory effect of R, FR and W, auxin, anti-auxin and inhibitors of PAT. In excised mesocotyl tissue 3394 seedlings also showed essentially low responsiveness to NAA. Cells of 3394 were insensitive to auxin-and light-induced hyperpolarization of the plasma membrane. Expression of ABP4 was much less in 3394 than in 307, and in contrast to 307, it was not upregulated by NAA, R and FR. Preliminary analysis of abp mutants suggests that ABPs may be involved in development of leaf angle in corn.Our results confirm the understanding that auxin interacts with light in the regulation of growth and development of young seedlings and suggest that in corn ABPs may be involved in growth of maize seedlings and development of leaf angle. We hypothesize that ABP4 plays an important role in the auxin-and/or light-induced growth responses. We also hypothesize that in the modern corn hybrid 3394, ABP4 is "mutated," which may result in the observed 3394 phenotypes, including upright leaves.

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Section: Discussionsupporting

confidence: 79%

“…PCIB is an anti-auxin, or auxin-antagonist, likely competing with auxins for their receptors. [58][59][60][61][62] Our results show that, depending on its concentration, PCIB altered elongation of 307 and 3306. This suggests that PCIB applied alone interfered with the effect of endogenous auxin in elongation growth.…”

Section: Discussionmentioning

confidence: 67%

Development of Erect Leaves in a Modern Maize Hybrid is Associated with Reduced Responsiveness to Auxin and Light of Young Seedlings in vitro

Fellner

Ford

Volkenburgh

2006

Plant Signaling & Behavior

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“…Interractions in in vitro systems between auxins and MH have been the subject of several previous studies (7,8,13,14 (16) and Kulescha (13) suggests that the effect of MH is not on the levels of auxins, but rather on their utilization, and therefore the action of MH on auxin systems is best described as that of an auxin antagonist. These effects are displayed as an antagonism of one chemical on the expression of the particular stimulatory or inhibitory reaction induced by the other.…”

Section: Discussionmentioning

confidence: 99%

Maleic hydrazide-auxin interractions in water uptake of potato discs

Taylorson

Holm

1961

Plant Physiol.

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“…The reason may be interpreted as follows. First, PCIB is an antiauxin or an auxin antagonist; it inhibits the action of auxin by binding to auxin receptor sites and thus inhibits many auxin-induced physiological effects (Foster et al, 1995;Heupel and Stange, 1995;Kim et al, 2000;Xie et al, 2000). Second, microspore cultures of different plants produce different concentrations of endogenous hormones (Baillie et al, 1992;Ferrie et al, 1999), so when PCIB and endogenous hormones work together, different plants have different optimal PCIB concentrations.…”

Section: Discussionmentioning

confidence: 99%

Effects of p-chlorophenoxyisobutyric acid, arabinogalactan, and activated charcoal on microspore embryogenesis in kale

Niu¹,

Zhang²,

Tong³

et al. 2015

Genet. Mol. Res.

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ABSTRACT. To improve embryogenesis in microspore cultures of kale (Brassica oleracea L. var. acephala DC.), 6-benzylaminopurine (6-BA), naphthaleneacetic acid (NAA), arabinogalactan (AG), p-chlorophenoxyisobutyric acid (PCIB), and activated charcoal (AC) were added to the medium using four varieties of kale. The results showed that the addition of AG (0.1-0.2 g/L), AC (0.1-0.2 g/L) or a combination of 6-BA (0.1-0.2 mg/L) and NAA (0.1-0.2 mg/L) promoted embryogenesis. Adding 40 μM PCIB or a combination of 40 μM PCIB and 0.2 g/L AC to NLN-13 medium at pH 5.8 effectively enhanced embryogenesis. Treatment with a combination of 40 μM PCIB and 10 mg/L AG gave the highest rate of embryonic induction, especially in genotype "Y007," which showed a twelve-fold increase in yield.

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Auxin-Antiauxin Interaction at High Auxin Concentrations.

Cited by 33 publications

References 4 publications

Development of Erect Leaves in a Modern Maize Hybrid is Associated with Reduced Responsiveness to Auxin and Light of Young Seedlings in vitro

Development of Erect Leaves in a Modern Maize Hybrid is Associated with Reduced Responsiveness to Auxin and Light of Young Seedlings in vitro

Maleic hydrazide-auxin interractions in water uptake of potato discs

Effects of p-chlorophenoxyisobutyric acid, arabinogalactan, and activated charcoal on microspore embryogenesis in kale

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