Academic
Publications
Effect of temperature on the dose–response curves for auxin-induced elongation growth in maize coleoptile segments

Effect of temperature on the dose–response curves for auxin-induced elongation growth in maize coleoptile segments,10.1007/s11738-010-0563-1,Acta Phys

Effect of temperature on the dose–response curves for auxin-induced elongation growth in maize coleoptile segments  
BibTex | RIS | RefWorks Download
The dose–response curves for IAA-induced growth in maize coleoptile segments were studied as a function of time and temperature. In addition, the kinetics of growth rate responses at some auxin concentrations and temperatures was also compared. It was found that the dose–response curves for IAA-induced elongation growth were, independently of time and temperature, bell-shaped with an optimal concentration at 10−5 M IAA. The kinetics of IAA-induced growth rate responses depended on IAA concentration and temperature, and could be separated into two phases (biphasic reaction). The first phase (very rapid) was followed by a long lasting one (second phase), which began about 30 min after auxin addition. For coleoptile segments incubated at 30°C, the amplitudes of the first and second phase were significantly higher, when compared with 25°C, at all IAA concentrations studied. However, when coleoptile segments were incubated at 20°C, the elongation growth of coleoptile segments treated with suboptimal IAA concentrations was diminished, mainly as a result of both phases reduction. In conclusion, we propose that the shape of the dose–response curves for IAA-induced growth in maize coleoptile segments is connected with biphasic kinetic of growth rate response.
Journal: Acta Physiologiae Plantarum - ACTA PHYSIOL PLANT , vol. 33, no. 2, pp. 437-442, 2011
Cumulative Annual
View Publication
The following links allow you to view full publications. These links are maintained by other sources not affiliated with Microsoft Academic Search.