Gametophytic Gene Expression in Embryo-lethal Mutants of Arabidopsis thaliana
The genetic control of embryo development in higher plants has been approached in part through the isolation and characterization of embryo-lethal mutants (Meinke 1986). The most extensive studies have dealt with defective kernel mutants of corn (Sheridan and Neuffer 1982), embryo-lethal mutants of Arabidopsis (Müller 1963; Meinke 1985), and variant cell lines of carrot unable to complete somatic embryogenesis in vitro (Breton and Sung 1982). Arabidopsis thaliana (Cruciferae) has been used as a model plant system for various studies in developmental and molecular genetics because it produces many seeds per plant and has a short generation time, low chromosome number, well-characterized mutants (Rédei 1975), an established linkage map (Koornneef et al. 1983), and an unusually small genome with little repetitive DNA (Leutwiler et al. 1984). Recessive embryolethal mutants of Arabidopsis isolated following EMS seed mutagenesis have been shown previously to differ with respect to the stage of developmental arrest, the color of arrested embryos and aborted seeds, the percentage and distribution of aborted seeds in heterozygous siliques, the extent of abnormal embryo development, the response of mutant embryos in culture, the development of homozygous mutant plants, the formation of protein and lipid bodies, and the accumulation of seed storage proteins (Meinke and Sussex 1979a,b; Meinke 1982, 1985; Meinke et al. 1985; Marsden and Meinke 1985).
KeywordsCorn Dicarboxylate Stam
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