Project description:Heat stress is the primary obstacle for landscape application of azalea in hot-summer areas. Heat acclimation can confer acquired thermotolerance to R. hainanense even after a long recovery. The mechanisms and key factors involved in the heat acclimation memory were investigated.
Project description:Homalium hainanense is a large evergreen tree species belonging to Salicaceae family, and its wood is tough, fine-grained, which makes it a good source of commercial use for building construction and furniture manufacturing. In this study, we sequenced the complete chloroplast genome of H. hainanense based on next generation sequencing and used these data to assess genomic resources. The size of the H. hainanense chloroplast genome was 157,852 bp, including a large single-copy region (85,888 bp), a small single-copy region (16,592 bp), and a pair of inverted repeats regions (27,686 bp). The overall GC content of the H. hainanense chloroplast genome was 36.6%. The plastome of H. hainanense was predicted to contain 112 unique genes, including 78 protein coding genes, 30 tRNA genes and 4 rRNA genes. The reconstructed phylogeny revealed that Homalium was monophyletic and H. hainanense was sister to H. stenophyllum, H. paniculiflorum and H. racemosum.
Project description:Four new limonoids, dysohainanins A–D (1–4), and two new triterpenoids, dysohainanins E and F (5 and 6), together with seven known ones were isolated from the twigs and leaves of Dysoxylum hainanense Merr. The structures of the new compounds were determined by a variety of spectroscopic methods. The cytotoxic activities of these compounds were evaluated, and the known compound ent-19-nor-4,16,18-trihydroxy-8(14)-pomaren-15-one (13) showed in vitro cytotoxicity against HL-60, A-549, MCF-7, and SW480 cells, with IC50 values of 24.3, 28.1, 30.7, and 22.5 µM, respectively. Compounds 2 and 3 were tested their insecticidal activities using brine shrimp and both of them were inactive. Electronic Supplementary Material Supplementary material is available for this article at 10.1007/s13659-011-0030-8 and is accessible for authorized users.
