Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Restricted cell elongation in Arabidopsis hypocotyls is associated with a reduced average pectin esterification level | BMC Plant Biology BioMed Central Research article Open Access Restricted cell elongation in Arabidopsis hypocotyls is associated with a reduced average pectin esterification level Paul Derbyshire1 Maureen C McCann2 and Keith Roberts 3 Address Department of Metabolic Biology John Innes Centre Colney Lane Norwich NR4 7UH UK 2Department of Biological Sciences Purdue University West Lafayette IN 47907 USA and 3Department of Cell and Developmental Biology John Innes Centre Colney Lane Norwich NR4 7UH UK Email Paul Derbyshire - Maureen C McCann - mmcann@ Keith Roberts - Corresponding author Published 17 June 2007 BMC Plant Biology 2007 7 31 doi 147l-2229-7-3l Received 14 February 2007 Accepted 17 June 2007 This article is available from http 1471-2229 7 3 1 2007 Derbyshire et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background Cell elongation is mainly limited by the extensibility of the cell wall. Dicotyledonous primary growing cell walls contain cellulose xyloglucan pectin and proteins but little is known about how each polymer class contributes to the cell wall mechanical properties that control extensibility. Results We present evidence that the degree of pectin methyl-esterification DE limits cell growth and that a minimum level of about 60 DE is required for normal cell elongation in Arabidopsis hypocotyls. When the average DE falls below this level as in two gibberellic acid GA mutants gal-3 and gai and plants expressing pectin methyl-esterase PMEI from Aspergillus aculeatus then hypocotyl elongation is reduced. Conclusion Low average levels of pectin DE are associated with reduced cell elongation .
