Rapid-growth responses of corn root segments: Effect of citrate-phosphate buffer on elongation

✍ Scribed by Kathryn L. Edwards; Tom K. Scott

• Publisher: Springer-Verlag
• Year: 1976
• Tongue: English
• Weight: 465 KB
• Volume: 129
• Category: Article
• ISSN: 0032-0935
• DOI: 10.1007/bf00398262

✦ Synopsis

The effects of citrate-phosphate buffer on the elongation rate of 2 mm root segments of Zea mays L. was investigated under 02 and N2 conditions by comparing with the effects in non-buffered solution. The buffer at pH 7.0 has an inhibiting effect on the elongation rate of root segments. At pH 4.0 the buffer has a promoting effect on the elongation rate twice that of the H-ion concentration. Nitrogen experiments indicate that growth in neutral buffer is O2 dependent. On the other hand the acid-growth response of root segments in citrate-phosphate buffer appears to have two components, 1) a H-ion component which is partially inhibited by N2 and fluoride and 2) a citrate component which is inhibited in part by N 2 but not by fluoride.