Role of hydroxyproline-rich cell wall protein in growth regulation of rice coleoptiles grown on or under water
- 1 June 1980
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant and Cell Physiology
- Vol. 21 (4) , 511-524
- https://doi.org/10.1093/oxfordjournals.pcp.a076027
Abstract
The elongation of both intact and excised rice coleoptiles was promoted when they were submerged in water. Amino acid analysis of the cell wall revealed that air-type coleoptiles (grown on the surface of water) contained more hydroxyproline than water-type ones (grown under water). The suppression of hydroxylation of peptidyl proline under water was confirmed with air-type sections by examining the imino acid content, 14C-proline incorporation into the cell wall and its modification by α,α′-dipyridyl. Also, dipyridyl significantly promoted the growth of floated sections to the level of submerged sections. Therefore, the lower hydroxyproline content caused by lower oxygen tension in water is concluded to be one of the factors promoting growth of rice coleoptiles under water. However, the hydroxyproline content in the cell wall decreased with growth of both air-and water-type coleoptiles; thus hydroxyproline-rich cell wall protein can not be regarded as the final growth cessation factor in rice coleoptiles.Keywords
This publication has 1 reference indexed in Scilit:
- Direct incorporation of hydroxyproline into protein of sycamore cells incubated at growth-inhibitory levels of hydroxyproline.Proceedings of the National Academy of Sciences, 1967