Correlations between polyamine ratios and growth patterns in seedling roots |
| |
Authors: | Hui-Juan Shen Arthur W Galston |
| |
Institution: | (1) Department of Biology, Yale University, 06511 New Haven, CT, USA;(2) Present address: Nanjing Technological College of Forest Products, Nanjing, PRC |
| |
Abstract: | The levels of putrescine, cadaverine, spermidine and spermine were determined in seedling roots of pea, tomato, millet and corn, as well as in corn coleoptiles and pea internodes. In all roots, putrescine content increased as elongation progressed, and the putrescine/spermine ratio closely paralleled the sigmoid growth curve up until the time of lateral root initiation. Spermidine and spermine were most abundant near the apices and declined progressively with increasing age of the cells. In the zone of differentiation of root hairs in pea roots, putrescine rose progressively with increasing age, while cadaverine declined. In both pea internodes and corn coleoptiles, the putrescine/spermidine ratio rises with increasing age and elongation. Thus, a block in the conversion of the diamine putrescine to the triamine spermidine may be an important step in the change from cell division to cell elongation.Supported by a Fellowship of the Peoples' Republic of China.Aided by grant 5-RO1-AGO2742 from the National Institutes of Health to A.W.G. |
| |
Keywords: | Growth patterns polyamines putrescine spermidine seedlings |
本文献已被 SpringerLink 等数据库收录! |
|