Über ein neues Auxin („Hetero-auxin“) aus Harn. 11. Mitteilung über pflanzliche Wachstumsstoffe

Kögl, Fritz; Haagen‐Smit, A. J.; Erxleben, Hanni

doi:10.1515/bchm2.1934.228.1-2.90

Cited by 162 publications

(24 citation statements)

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“…The transmitted signal in phototropism and gravitropism was later found to be a phytohormone, and its redistribution on opposite sides of the root or shoot was hypothesized to promote differential growth and bending of the organ (Went, 1926;Cholodny, 1927). Over the years, the phytohormone was characterized as indole-3-acetic acid (IAA, auxin;Kögl et al, 1934;Thimann, 1935), and the 'Cholodny-Went' theory was demonstrated for gravitropism and phototropism (Rashotte et al, 2000;Friml et al, 2002). In addition to auxin, second messengers such as Ca 2+ , pH oscillations, reactive oxygen species (ROS) and abscisic acid (ABA) were shown to play an essential role in gravitropism (Young and Evans, 1994;Fasano et al, 2001;Joo et al, 2001;Ponce et al, 2008).…”

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Reactive oxygen species tune root tropic responses

et al. 2016

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The default growth pattern of primary roots of land plants is directed by gravity. However, roots possess the ability to sense and respond directionally to other chemical and physical stimuli, separately and in combination. Therefore, these root tropic responses must be antagonistic to gravitropism. The role of reactive oxygen species (ROS) in gravitropism of maize and Arabidopsis (Arabidopsis thaliana) roots has been previously described. However, which cellular signals underlie the integration of the different environmental stimuli, which lead to an appropriate root tropic response, is currently unknown. In gravity-responding roots, we observed, by applying the ROS-sensitive fluorescent dye dihydrorhodamine-123 and confocal microscopy, a transient asymmetric ROS distribution, higher at the concave side of the root. The asymmetry, detected at the distal elongation zone, was built in the first 2 h of the gravitropic response and dissipated after another 2 h. In contrast, hydrotropically responding roots show no transient asymmetric distribution of ROS. Decreasing ROS levels by applying the antioxidant ascorbate, or the ROS-generation inhibitor diphenylene iodonium attenuated gravitropism while enhancing hydrotropism. Arabidopsis mutants deficient in Ascorbate Peroxidase 1 showed attenuated hydrotropic root bending. Mutants of the root-expressed NADPH oxidase RBOH C, but not rbohD, showed enhanced hydrotropism and less ROS in their roots apices (tested in tissue extracts with Amplex Red). Finally, hydrostimulation prior to gravistimulation attenuated the gravistimulated asymmetric ROS and auxin signals that are required for gravity-directed curvature. We suggest that ROS, presumably H 2 O 2 , function in tuning root tropic responses by promoting gravitropism and negatively regulating hydrotropism.

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Reactive oxygen species tune root tropic responses

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“…The following auxins are of significance as growth regulators. [87-51-4], C 10 H 9 NO 2 , M r 175.2, was isolated from human urine by Kögl in 1934 [20].…”

Section: Auxins and Auxin-type Compoundsmentioning

confidence: 99%

Plant Growth Regulators

Sauter¹,

Zeeh²

2000

Ullmann's Encyclopedia of Industrial Chemistry

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“…Beginning of the structure-activity study of plant growth hormones at Pomona college: formulation of two-point attachment hypothesis for substituted phenoxyacetic acids After indole-3-acetic acid (IAA) was identified to be the natural plant hormone to regulate the plant growth in 1934 [1], a number of analogous aromatic carboxylic acids were synthesized and tested. In 1941, 2-methyl-4-chlorophenoxyacetic acid (2-Me-4-Cl-POA: MCPA) and 2,4-Cl 2 -POA (2,4-D), both being markedly active as the growth hormone, were found to be highly active as selective herbicides to eradicate broad leaf weeds while protecting grass crops by W. G. Templeman and W. A. Sexton at ICI in the UK (now a part of Syngenta) [2].…”

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In memoriam Professor Corwin Hansch: birth pangs of QSAR before 1961

Fujita

2011

J Comput Aided Mol Des

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Über ein neues Auxin („Hetero-auxin“) aus Harn. 11. Mitteilung über pflanzliche Wachstumsstoffe

Cited by 162 publications

References 0 publications

Reactive oxygen species tune root tropic responses

Reactive oxygen species tune root tropic responses

Plant Growth Regulators

In memoriam Professor Corwin Hansch: birth pangs of QSAR before 1961

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