Journal
PLANT CELL
Volume 24, Issue 1, Pages 163-177Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.111.093575
Keywords
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Funding
- Asia-Europe Forestry Exchange Program
- Austria Science Foundation (FWF) [P13353]
- AKTION Osterreich-Tschechische Republik [21p8]
- FWF [P14477, F03707]
- Max-Planck Gesellschaft
- Deutsche Forschungsgemeinshaft [PE1642/5-1]
- Austrian Science Fund (FWF) [P13353, P14477] Funding Source: Austrian Science Fund (FWF)
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In plants, regulation of cellulose synthesis is fundamental for morphogenesis and plant growth. Cellulose is synthesized at the plasma membrane, and the orientation of synthesis is guided by cortical microtubules; however, the guiding mechanism is currently unknown. We show that the conditional root elongation pom2 mutants are impaired in cell elongation, fertility, and microtubule-related functions. Map-based cloning of the POM-POM2 locus revealed that it is allelic to CELLULOSE SYNTHASE INTERACTING1 (CSI1). Fluorescently tagged POM2/CSI1s associated with both plasma membrane-located cellulose synthases (CESAs) and post-Golgi CESA-containing compartments. Interestingly, while CESA insertions coincided with cortical microtubules in the pom2/csi1 mutants, the microtubule-defined movement of the CESAs was significantly reduced in the mutant. We propose that POM2/CSI1 provides a scaffold between the CESAs and cortical microtubules that guide cellulose synthesis.
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