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Transcript profiling of a novel plant meristem,the monocot cambium

Journal of Integrative Plant Biology 2017年第6期59卷 436-449页

作者： Matthew Zinkgraf Suzanne Gerttula Andrew Groover US Forest Service Pacific Southwest Research StationDavisCaliforniaUSA Department of Computer Science University of CaliforniaDavisUSA Department of Plant Biology University of CaliforniaDavisUSA

While monocots lack the ability to produce a vascular cambium or woody growth, some monocot lineages evolved a novel lateral meristem, the monocot cambium, which supports secondary radial growth of stems. In contrast to the vascular cambium found in woody angiosperm and gymnosperm species, the monocot cambium produces secondary vascular bundles, which have an amphivasal organization of tracheids encircling a central strand of phloem. Currently there is no information concerning the molecular genetic basis of the develop- ment or evolution of the monocot cambium. Here we report high-quality transcriptomes for monocot cambium and early derivative tissues in two monocot genera, Yucca and Cordyline. Monocot cambium transcript profiles were compared to those of vascular cambia and secondary xylem tissues of two forest tree species, Populus trichocarpa and Eucalyptus grandis. Monocot cambium transcript levels showed that there are extensive overlaps between the regulation of monocot cambia and vascular cambia. Candidate regulatory genes that vary between the monocot and vascular cambia were also identified, and included members of the KANADI and CLE families involved in polarity and cell-cell signaling, respectively. We suggest that the monocot cambium may have evolved in part through reactivation of genetic mechanisms involved in vascular cambium regulation.

关键词： Chun-Ming Liu, Institute of Crop Science, CAAS, ChinaReceived Feb. 18, 2017 Accepted Mar. 15, 2017 Online on Mar. 17,2017

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