GROWTH, AUXIN, AND TROPISMS IN DECAPITATED AVENA COLEOPTILES
نویسندگان
چکیده
منابع مشابه
Growth, Auxin, and Tropisms in Decapitated Avena Coleoptiles.
With all the work on auxin appearing in the last years it is remarkable that not more investigations are concerned with the actual role of the auxins inside the plant. Barring some early opposition, the original statement "Without auxin no growth" (12) has stood unchallenged for many years. Probably this was so because all test methods were based on the principle of proportionality between auxi...
متن کاملEffects of cytokinins on growth and auxin in coleoptiles of derooted Avena seedlings.
It is known that removal of the endosperm (deseeding) reduces subsequent auxin production in the oat coleoptile tip and the "regeneration of the physiological tip" (auxin production) in the decapitated coleoptile as determined by the quantities of auxin which are secreted into agar blocks and assayed by the Avena curvature test (10). This decrease in auxin production is associated with parallel...
متن کاملAuxin-induced hydrogen ion excretion from Avena coleoptiles.
Avena coleoptiles excrete hydrogen ions in response to the hormone auxin. Both auxin-induced cell elongation and hydrogen ion excretion occur after only a short lag, and both are prevented by either carbonyl cyanide m-chlorophenylhydrazone or cycloheximide. These results support the idea that hydrogen ions act as a second messenger in auxin-induced cell elongation and can be the wall-loosening ...
متن کاملAuxin-induced growth of Avena coleoptiles involves two mechanisms with different pH optima.
Although rapid auxin-induced growth of coleoptile sections can persist for at least 18 hours, acid-induced growth lasts for a much shorter period of time. Three theories have been proposed to explain this difference in persistence. To distinguish between these theories, the pH dependence for auxin-induced growth of oat (Avena sativa L.) coleoptiles has been determined early and late in the el...
متن کاملpH-Dependence of Extension Growth in Avena Coleoptiles and Its Implications for the Mechanism of Auxin Action.
The pH-dependence of acid-induced growth in excised segments of Avena sativa coleoptiles has been reinvestigated in the pH range 3 to 7. In contrast to previous reports (e.g. DL Rayle [1973] Planta 114: 63-73), only acidic buffers with a pH below 5.0 induce an extension response. A pH of 3.5 to 4.0 is required to mimic auxin-mediated growth. Very similar pH-response curves are obtained with bot...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1942
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.17.2.236