Pflanzenreich macfarlane sarraceniaceae by A. Engler

By A. Engler

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2). Thus, the regulation of meristem growth can be independent of cell number, and an increase in cell size in any one layer of the meristem can be sensed and compensated for by corresponding changes in cell proliferation. The organization of the tunica-corpus reflects specific patterns of cell divisions within the angiosperm vegetative meristem, with the anticlinal divisions of the tunica layer(s) contributing to surface growth and the variable division orientations of the corpus providing growth by volume (Esau, 1965).

CLV2 acts in the same meristem growth control pathway as CLVJ and CLV3, but also functions more widely during development (Kayes and Clark, 1998). clvl and clv3 alleles dominantly suppress stm mutant phenotypes and vice versa, indicating that CLV1/CLV3 and STM act antagonistically to regulate shoot apical meristem function (Clark et al, 1996). The three CLV genes form critical components of a signal transduction pathway that communicates stem cell fate information between neighboring groups of shoot apical meristem cells.

1998). , 1998), but it is not yet clear which Rop or Rops participate in CLV signaling. Rho/Rac GTPases are members of the Ras GTPase superfamily, and are conserved signaling proteins that mediate many receptor tyrosine kinase signaling events in animals and fungi to control key cellular processes, such as actin cytoskeletal reorganization, cell polarity and polarized cell growth (Chant and Stowers, 1995; Nagata and Hall, 1996). Ras GTPases are not present in the Arabidopsis genome (Initiative, 2000) and have yet to be found in plants.

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