By Jules Janick
The newest info on utilized themes in horticultural sciences. This ebook emphasizes utilized themes together with the construction of end result, greens, nut plants, and decorative vegetation of industrial value. a variety of references offer effortless, time-saving and value powerful entry to the first literature.
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Extra info for Horticultural Reviews (Volume 19)
Recently, a family of petunia ACC oxidase genes have been cloned (Tang et al. 1993) and their expression in petunia flowers has been studied in detail (Tang et al. 1994). Four ACC oxidase genes were characterized but only three were found to be actively transcribed. These expressed ACC oxidase genes were termed AC01, AC03, and AC04. In agreement with Pech et al. (1987), each of the three ACC oxidase mRNAs accumulated in the gynoecium during early flower development, reaching their maximal levels at the time of flower opening (Tang et al.
A divergent ACC synthase cDNA was cloned that corresponds to an auxin-regulated ACC synthase gene in orchid that is expressed in the stigma upon pollination, in response to auxin, and in the presence of pollen or auxin and 2,5-norbornadiene (A. Q. Bui and S. D. O'Neill, unpublished). Taken together, there appear to be at least two different types of ACC synthase genes expressed in pollinated orchid flowers that differ markedly in their spatial and hormonal regulation: one that responds to the primary pollination signal (tentatively identified as auxin), and another that serves to amplify that signal by triggering, and in some instances sustaining, autocatalytic ethylene production.
Because of the obvious connection between the cytoskeleton and the distribution of organelles and the regulation of meiosis, various investigators have examined the structure of the microtubules in the megasporocyte and megaspores (Bednara et a1. 1988; Webb and Gunning 1990). These investigations have been greatly assisted by the technique of isolation of the megagametophyte from other ovule tissues (Van Went and Kwee 1990; Theunis et a1. 1991), which makes three-dimensional analysis of the megagametophyte structure and biochemistry more feasible.