1992
DOI: 10.1104/pp.98.4.1342
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Metabolism of 1-Aminocyclopropane-1-Carboxylic Acid in Etiolated Maize Seedlings Grown under Mechanical Impedance

Abstract: We investigated the metabolism of 1-aminocyclopropane-1-carboxylic acid (ACC) in etiolated maize (Zea mays L.) seedlings subjected to mechanical impedance by applying pressure to the growing medium. Total concentrations of ACC varied little in unimpeded seedlings, but impeded organs accumulated ACC. Roots had consistently higher concentrations of ACC than shoots or seeds, regardless of treatment. The concentration of ACC in the roots increased more than 100% during the first hour of treatment irrespective of t… Show more

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Cited by 29 publications
(26 citation statements)
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“…The rate of ethylene production by maize seedlings was shown to be promoted after only 1 h of mechanical impedance by Sarquis et al (1991), and this promotion was fully consistent with increases in ACC concentrations, malonyl/ ACC concentrations, and in vivo ACC synthase activity at 1 h at the level of impedance used in this study (100 kPa) (Sarquis et al, 1992). In the present study, mechanical impedance alone or in combination with hypoxia elevated ACC synthase activity and ethylene biosynthesis rapidly, with statistically significant differences at 1 h. Timing of the response to hypoxia, measured in the same experiments, was clearly different from that of mechanical impedance.…”
Section: Discussionsupporting
confidence: 78%
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“…The rate of ethylene production by maize seedlings was shown to be promoted after only 1 h of mechanical impedance by Sarquis et al (1991), and this promotion was fully consistent with increases in ACC concentrations, malonyl/ ACC concentrations, and in vivo ACC synthase activity at 1 h at the level of impedance used in this study (100 kPa) (Sarquis et al, 1992). In the present study, mechanical impedance alone or in combination with hypoxia elevated ACC synthase activity and ethylene biosynthesis rapidly, with statistically significant differences at 1 h. Timing of the response to hypoxia, measured in the same experiments, was clearly different from that of mechanical impedance.…”
Section: Discussionsupporting
confidence: 78%
“…Use of the triaxial cells requires that the experimental tissue be the primary roots of seedlings. In our experience with maize seedlings, nodal roots respond to hypoxia and N, starvation (Drew et al, 1989;He et al, 1992He et al, , 1994 via effects on ethylene biosynthesis or sensitivity, as do primary roots to physical impedance (Sarquis et al, 1991(Sarquis et al, , 1992. Brailsford et al (1993) also found similar effects of hypoxia on primary maize roots, as previously Plant Physiol.…”
Section: -845-0456supporting
confidence: 81%
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“…If the increased ethylene biosynthesis during mechanical impedance turns out to be a major factor in regulating the root morphology as reported by earlier studies (Goeschl et al, 1966;Kays et al, 1974;Sarquis et al, 1991Sarquis et al, , 1992He et al, 1996), one would assume that eto1-1 roots will not respond to the mechanical impedance. However, in our experimental condition, eto1-1 roots responded to mechanical stimulus in a wild-type manner not only in the absence of exogenous ethylene, but also in the presence of a saturating concentration of ethylene (Figs.…”
Section: Discussionmentioning
confidence: 99%
“…It is generally assumed that increased ethylene evolution in mechanically impeded roots is the primary factor in regulating root morphology and development (Goeschl et al, 1966;Kays et al, 1974;Sarquis et al, 1991Sarquis et al, , 1992He et al, 1996). However, a controversy exists on this issue because several studies failed to detect any change in ethylene evolution or 1-aminocyclopropane-1-carboxylic acid (ACC) synthase and ACC oxidase activities during root mechanical impedance (Lachno et al, 1982;Moss et al, 1988;Hussain et al, 1999Hussain et al, , 2000.…”
Section: Discussionmentioning
confidence: 99%