ABSTRACT
The complete chloroplast genome of Juniperus cedrus is a circular molecule of 127 126 bp in length with 115 single copy genes and two duplicated genes (trnI-CAU and trnQ-UUG). The genome contains 82 protein-coding genes, four ribosomal RNA genes and 33 transfer RNA genes. In these genes, eight genes (rpl16, rpl2, rpoC1, petD, petB, ndhB, ndhA and atpF) harbor a single intron and two genes (rps12 and ycf3) harbor two introns. Like other sequenced chloroplast genomes of conifers, this genome does not contain canonical inverted repeats (IRs), and the overall GC content of J. cedrus chloroplast DNA is 35%. The phylogenetic analysis revealed that J. cedrus is more closely related to J. scopulorum and J. bermudiana.
Subject(s)
Cedrus/genetics , Genome, Chloroplast/genetics , Genome, Mitochondrial/genetics , Base Composition/genetics , Base Sequence/genetics , Biological Evolution , Chloroplasts/genetics , Cupressaceae/genetics , DNA, Chloroplast/genetics , Evolution, Molecular , Gene Order , Genes, Mitochondrial/genetics , Genome/genetics , Genome, Plant/genetics , Juniperus/genetics , Mitochondria/genetics , Phylogeny , Sequence Analysis, DNA/methodsABSTRACT
Effects of gap in primitive fir forest in southeast Tibet on species diversity of herb and shrub were studied. The results showed that species composition, distribution and diversity in gap were different from those in non-gap. The improvement of illumination and other habitat conditions resulted in richer species of herb and shrub in gap. There were shade-tolerant and photophilic herb species and shrub species in gap, however, only shade-tolerant herb species and shrub species grew in non-gap. Species diversity and evenness in gap were higher than in non-gap. The diminutive similar coefficient between herb and shrub communities showed that certain difference existed between herb and shrub communities in stands of gap and non-gap. The similar coefficients were little correlative between gap area and communities. Gap was important to improve growth of herb and shrub and maintain species diversity of primitive subalpine fir forest in southwest Tibet.
