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 ga1-3 and gai, and plants expressing pectin methyl-esterase (PME1) from Aspergillus aculeatus, then hypocotyl elongation is reduced. CONCLUSION:Low average levels of pectin DE% are associated with reduced cell elongation, implicating PMEs, the enzymes that regulate DE%, in the cell elongation process and in responses to GA. At high average DE% other components of the cell wall limit GA-induced growth.
journal_name
BMC Plant Bioljournal_title
BMC plant biologyauthors
Derbyshire P,McCann MC,Roberts Kdoi
10.1186/1471-2229-7-31subject
Has Abstractpub_date
2007-06-17 00:00:00pages
31issn
1471-2229pii
1471-2229-7-31journal_volume
7pub_type
杂志文章abstract:BACKGROUND:Chromosome pairing, recombination and DNA repair are essential processes during meiosis in sexually reproducing organisms. Investigating the bread wheat (Triticum aestivum L.) Ph2 (Pairing homoeologous) locus has identified numerous candidate genes that may have a role in controlling such processes, includin...
journal_title:BMC plant biology
pub_type: 杂志文章
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更新日期:2007-12-20 00:00:00
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