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• W2067276078 endingPage "93" @default.
• W2067276078 startingPage "51" @default.
• W2067276078 abstract "1. The article deals mainly with the last decade, although earlier work is briefly surveyed. 2. In general an effect of auxins in increasing cell wall extensibility has been verified, although there is no consistent correlation of growth rate with either elastic or plastic extensibility. There is a general tendency to regard the older methods of measuring extensibilities as too drastic and therefore misleading. 3. Two phases in cell elongation have been recognized, namely, an initial phase of pure wall stretching and a subsequent phase of wall growth by intussusception. Auxins may stimulate the first phase by increasing the swelling capacity of the intermicellar colloids (pectins) through the intermediary of the living protoplasm. The phase of intussusception may also be affected. Most recent theories suggest that these actions are effected by a disturbance of the intramolecular forces concerned in the formation and maintenance of the molecular lattice of the young cell wall (Diehl et al., Burström). 4. The maintenance of cellular osmotic pressures during active elongation has suggested an active solute uptake mediated by an auxin-augmented respiratory process as the cause of cell elongation (Commoner). The results do not justify these conclusions. 5. The early claims of J. Bonner of a stimulation of respiration by auxin in Avena coleoptiles have been verified under certain experimental conditions. It seems possible that the degree of this stimulation may be influenced by the presence of various components of the Gyorgyi C4 dicarboxylic acid respiration cycle, which occurs in Avena coleoptiles. The use of monoiodoacetic acid as a differential inhibitor is misleading and results so far afford no proof of the action of auxins as a coenzyme in the C4-acid cycle. 6. Auxin has no effect on the in vitro activity of a wide range of dehydrogenases extracted from Avena coleoptiles or on catalase and some plant oxidases. The heightened dehydrogenase activity of auxin-treated coleoptiles may be due to an in vivo activation (Berger & Avery) or to an active enzyme synthesis. 7. The production of simple sugars from carbohydrate reserves after auxin application is not due to an activation of diastase or to its ‘elution’ by auxin from a protective colloid. This shift in the starch → sugar equilibrium is probably secondary to the main action of auxin. 8. The original postulates of Koepfli, Thimann & Went concerning the minimum molecular requirements for auxin activity have been verified by all recent work. Most evidence supports the view that auxin is effective only in the undissociated state and not as an anion. It seems unlikely from polarographic investigations that auxins act as respiratory coenzymes by virtue of a reversible oxido-reduction of the essential double bond in the ring. Physiological activity is probably associated with an essential high (lipophilic) surface activity of the ring and its double bond(s), the polar -COOH group being most effective when orientated perpendicular to the plane of this ring. 9. An auxin-induced lowering of the protoplasmic structural viscosity has suggested a dissociating action on the complex plasma proteins (Northen). The resulting heightening of cell activity could originate the many diverse phenomena evoked by auxins. Such an effect on the ‘cytoskeleton’ is supported by the antagonistic action of certain quinonoid compounds (Jones). The acceleration of protoplasmic streaming by auxins and the interaction of malate still needs verification. More direct experiments are necessary to check the suggestion (Veldstra) that auxins regulate permeability, and therefore growth, after adsorption at a lipoid interface in the cell membrane. 10. Studies on the interaction of the auxins have thrown doubt on the ‘hemiauxin’ hypothesis of Went and suggest their action as coenzymes (Skoog). Further experimental data are required. Interactions with other cell metabolites are relatively unexplored, but offer profitable lines for research. 11. The general conclusion drawn is that most recent theories tend to be too restricted and superficial, and, unless auxin exerts a number of discrete effects in different cell systems, we must look deeper for a more fundamental action (e.g. the theories of Northen) to explain the whole range of relevant phenomena." @default.
• W2067276078 created "2016-06-24" @default.
• W2067276078 creator A5085861161 @default.
• W2067276078 date "1949-01-01" @default.
• W2067276078 modified "2023-09-26" @default.
• W2067276078 title "THE MECHANISM OF AUXIN ACTION" @default.
• W2067276078 cites W147454583 @default.
• W2067276078 cites W1525147190 @default.
• W2067276078 cites W1966759602 @default.
• W2067276078 cites W1967157318 @default.
• W2067276078 cites W1969058459 @default.
• W2067276078 cites W1969447609 @default.
• W2067276078 cites W1976314147 @default.
• W2067276078 cites W1976427729 @default.
• W2067276078 cites W1978410181 @default.
• W2067276078 cites W1979288752 @default.
• W2067276078 cites W1979461695 @default.
• W2067276078 cites W1982516401 @default.
• W2067276078 cites W1984110777 @default.
• W2067276078 cites W1987456609 @default.
• W2067276078 cites W1992083476 @default.
• W2067276078 cites W1992362516 @default.
• W2067276078 cites W1993289583 @default.
• W2067276078 cites W1994569499 @default.
• W2067276078 cites W1994678050 @default.
• W2067276078 cites W1998599837 @default.
• W2067276078 cites W2006171120 @default.
• W2067276078 cites W2006628750 @default.
• W2067276078 cites W2007136096 @default.
• W2067276078 cites W2008369650 @default.
• W2067276078 cites W2008541150 @default.
• W2067276078 cites W2009782247 @default.
• W2067276078 cites W2011526029 @default.
• W2067276078 cites W2012095900 @default.
• W2067276078 cites W2012290990 @default.
• W2067276078 cites W2012627828 @default.
• W2067276078 cites W2013604182 @default.
• W2067276078 cites W2014067349 @default.
• W2067276078 cites W2015676821 @default.
• W2067276078 cites W2020713905 @default.
• W2067276078 cites W2024089354 @default.
• W2067276078 cites W2024330337 @default.
• W2067276078 cites W2024418093 @default.
• W2067276078 cites W2024804050 @default.
• W2067276078 cites W2025532433 @default.
• W2067276078 cites W2027682423 @default.
• W2067276078 cites W2030895879 @default.
• W2067276078 cites W2031986705 @default.
• W2067276078 cites W2032313504 @default.
• W2067276078 cites W2033382515 @default.
• W2067276078 cites W2037100200 @default.
• W2067276078 cites W2038821811 @default.
• W2067276078 cites W2040279248 @default.
• W2067276078 cites W2043706075 @default.
• W2067276078 cites W2045300620 @default.
• W2067276078 cites W2046786686 @default.
• W2067276078 cites W2049626426 @default.
• W2067276078 cites W2051401643 @default.
• W2067276078 cites W2051625798 @default.
• W2067276078 cites W2052756998 @default.
• W2067276078 cites W2061584384 @default.
• W2067276078 cites W2065192882 @default.
• W2067276078 cites W2066515827 @default.
• W2067276078 cites W2068950376 @default.
• W2067276078 cites W2075749833 @default.
• W2067276078 cites W2076176703 @default.
• W2067276078 cites W2078774341 @default.
• W2067276078 cites W2081333946 @default.
• W2067276078 cites W2082627108 @default.
• W2067276078 cites W2083406004 @default.
• W2067276078 cites W2084978866 @default.
• W2067276078 cites W2086082533 @default.
• W2067276078 cites W2087719840 @default.
• W2067276078 cites W2093542146 @default.
• W2067276078 cites W2094052615 @default.
• W2067276078 cites W2095055771 @default.
• W2067276078 cites W2096463022 @default.
• W2067276078 cites W2102827487 @default.
• W2067276078 cites W2110205025 @default.
• W2067276078 cites W2111116706 @default.
• W2067276078 cites W2131750573 @default.
• W2067276078 cites W2148622797 @default.
• W2067276078 cites W2153293081 @default.
• W2067276078 cites W2160948067 @default.
• W2067276078 cites W2204620591 @default.
• W2067276078 cites W2230334197 @default.
• W2067276078 cites W2269356008 @default.
• W2067276078 cites W2312810394 @default.
• W2067276078 cites W2320260065 @default.
• W2067276078 cites W2321220661 @default.
• W2067276078 cites W2332371052 @default.
• W2067276078 cites W2333169667 @default.
• W2067276078 cites W2335232559 @default.
• W2067276078 cites W2410277308 @default.
• W2067276078 cites W2412287978 @default.
• W2067276078 cites W2800467118 @default.
• W2067276078 cites W3021723989 @default.
• W2067276078 cites W4234853967 @default.

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