Dev122325 1978..1983
نویسندگان
چکیده
During plant epidermal development, many cell types are generated fromprotodermal cells, a process requiringcomplex co-ordinationof cell division, growth, endoreduplication and the acquisition of differentiated cellular morphologies. Herewe show that theArabidopsis phytocalpain DEFECTIVE KERNEL 1 (DEK1) promotes the differentiated epidermal state. Plants with reduced DEK1 activity produce cotyledon epidermis with protodermal characteristics, despite showing normal growth and endoreduplication. Furthermore, in non-embryonic tissues (true leaves, sepals), DEK1 is required for epidermis differentiationmaintenance.We show that the HD-ZIP IV family of epidermis-specific differentiationpromoting transcription factors are key, albeit indirect, targets of DEK1 activity.We propose amodel inwhichDEK1 influencesHD-ZIP IV gene expression, and thus epidermis differentiation, by promoting cell adhesion and communication in the epidermis.
منابع مشابه
Comparison of the physical fitness of men and women entering the U.S. Army: 1978-1998.
PURPOSE To compare the physical fitness levels of recruits entering the U.S. Army in 1998 to those entering in 1978 and 1983. METHODS In 1998, 182 men and 168 women were tested before beginning basic training at Fort Jackson, SC. The measurements were 1) skin-fold estimation of percent body fat (%BF); 2) maximum oxygen uptake by treadmill running (VO2max); and 3) upper-body (UB), lower-body (...
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The subjects of nutrient partition during lactation in ruminants and the hormonal control of the relevant aspects of metabolism, particularly in relation to blood hormone concentrations, have been extensively reviewed (Convey, 1974; Bassett, 1978; Bines & Hart, 1978; Trenkle, 1978, 1981; Bauman & Currie, 1980; Bell, 1980; Cowie et al. 1980; McDowell, 1983). The purpose of this paper is to descr...
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Marrs, B. L. (1978) Curr. Top. Bioenerg. 8,261-294 393-407 Niederman, R. A. & Gibson, K. D. (1978) in The Photosynthetic Bacteria (Clayton, R. K. & Sistrom, W. R. eds.), pp. 79-118, Plenum Press, New York and London Niederman, R. A., Mallon, D. E. & Langan, J. J. (1976) Biochim. Biophys. Acta 440,429-447 Niederman, R. A., Mallon, D. E. & Parks, L. C. (1979) Biochim. Biophys. Acta 555,210-220 Ni...
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