By Michael T. McManus
Offers an summary of the position of meristematic tissues in plant progress and improvement. A useful source for plant geneticists, developmental biologists, and molecular biologists.
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Extra info for Meristematic Tissues in Plant Growth and Development
Example text
Thus, the CLV3 expression domain overlies the CLVJ expression domain, indicating that these two populations of meristem cells communicate with one another via the CLV signaling pathway. , 1999). , 1999). These data have been interpreted to mean that the coordinated expansion of the CLV expression domains is controlled by a positive, stem-cell-promoting pathway, which in turn 32 MERISTEMATIC TISSUES IN PLANT GROWTH AND DEVELOPMENT is negatively regulated by the stem-cell-restricting CLV pathway.
Both the tunica and the corpus participate in meristem maintenance and organ formation (Poethig and Sussex, 1985a and b), and meristem growth and cell fate specification during development are coordinated between all the cell layers. , 1940; Satina and Blakeslee, 1941). In both cases, growth and development of the meristem occurred normally despite the greatly enlarged epidermal cells. Cell proliferation was markedly reduced in the epidermal layer of these mosaic meristems, so that the area of the LI layer matched that of the underlying layers.
Every reported appearance of ectopic meristems in Arabidopsis, such as in the axils of phabulosa-dominantl (phab-Jd) leaves, is accompanied by STM expression (McConnell and Barton, 1998). Several other class I knox genes have also been identified inArabidopsis, but only one of them, KNAT1, is expressed in the shoot apical meristem and downregulated in incipient organ primordia in a pattern similar to STM (Lincoln et al, 1994). While no KNAT1 loss of function mutations have been described, transgenic Arabidopsis overexpressing KNAT1 can form ectopic meristems on adaxial leaf surfaces, indicating that KNAT1 is also likely to promote shoot apical meristem cell activity (Chuck et al..