Cell wall modifications in maize pulvini in response to gravitational stress

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DOIResolve DOI: http://doi.org/10.1104/pp.111.179606
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TypeArticle
Journal titlePlant Physiology
Volume156
Issue4
Pages21552171; # of pages: 17
Subjectcell walls; grasses; gravitropic response; metabolite profiles; phytohormones; pulvinus; transcript profiles
AbstractChanges in cell wall polysaccharides, transcript abundance, metabolite profiles, and hormone concentrations were monitored in the upper and lower regions of maize (Zea mays) pulvini in response to gravistimulation, during which maize plants placed in a horizontal position returned to the vertical orientation. Heteroxylan levels increased in the lower regions of the pulvini, together with lignin, but xyloglucans and heteromannan contents decreased. The degree of substitution of heteroxylan with arabinofuranosyl residues decreased in the lower pulvini, which exhibited increased mechanical strength as the plants returned to the vertical position. Few or no changes in noncellulosic wall polysaccharides could be detected on the upper side of the pulvinus, and crystalline cellulose content remained essentially constant in both the upper and lower pulvinus. Microarray analyses showed that spatial and temporal changes in transcript profiles were consistent with the changes in wall composition that were observed in the lower regions of the pulvinus. In addition, the microarray analyses indicated that metabolic pathways leading to the biosynthesis of phytohormones were differentially activated in the upper and lower regions of the pulvinus in response to gravistimulation. Metabolite profiles and measured hormone concentrations were consistent with the microarray data, insofar as auxin, physiologically active gibberellic acid, and metabolites potentially involved in lignin biosynthesis increased in the elongating cells of the lower pulvinus.
Publication date
LanguageEnglish
AffiliationNRC Plant Biotechnology Institute; National Research Council Canada
Peer reviewedYes
NRC number50198
NPARC number18856997
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Record identifier5b928305-0ef9-4049-8759-568d1b8eaa8d
Record created2012-03-30
Record modified2016-05-09
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