نتایج جستجو برای: gymnosperms
تعداد نتایج: 875 فیلتر نتایج به سال:
Unlignified primary cell walls containing ester-linked ferulic acid fluoresce blue in ultraviolet radiation which changes to green with increased intensity on treatment with ammonium hydroxide. Using this fluorescence behaviour, we detected ester-linked ferulic acid in the primary cell walls of all 41 species of gymnosperms we examined. These species were in 17 families representing all four ex...
We review recent advances on glossopterid reproductive biology and their implications for seed plant phylogeny the ecology of this widespread Permian Gondwanan group. Microsporangiate organs are interpreted to have been arranged in loose compound cones—an organization that evokes comparisons with Ginkgoales, Cordaitales early conifers. The pollen was typically taeniate, bisaccate, primarily ada...
While recent advances have been gained on genome evolution in angiosperm lineages, virtually nothing is known about karyotype evolution in the other group of seed plants, the gymnosperms. Here we used high density gene-based linkage mapping to compare the karyotype structure of two families of conifers (the most abundant group of gymnosperms) separated around 290 million years ago: Pinaceae and...
The WD-repeat proteins are found in eukaryotes and play an important role in the regulation of a wide variety of cellular functions including signal transduction, pre-mRNA processing and cytoskeleton assembly. In this study, a cDNA encoding a WD repeat-containing protein 13 (GbWDR13) was cloned by PCR from Ginkgo biloba. The length of GbWDR13 gene is 1500 bp, encoding 496 amino acids. The predi...
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