Dryopteris crassirhizoma
Nakai is a fern plant with important evolutionary and medicinal values. Herein, we assembled the complete chloroplast genome of
D. crassirhizoma
by next-generation sequencing technology. The complete chloroplast genome of
D. crassirhizoma
was 153,355 bp in length, and the GC content was 42.86%; the genome consisted of a pair of inverted repeats (IRs, 23,470 bp), a small single copy region (SSC, 21,570 bp) and a large single copy region (LSC, 84,854 bp). The genome contained 111 genes, namely, 73 protein-coding genes, 34 tRNA genes and four rRNA genes. The phylogenetic analysis suggested that both
D. crassirhizoma
and
D. decipiens
from Dryopteridaceae were most closely related to
Lepisorus clathratus
from Polypodiaceae.
Corydalis bungeana Turcz. is a perennial herb belonging to the family Papaveraceae. Its chloroplast genome was sequenced and characterized. The cp genome of C. bungeana is 167,629 bp long with a GC content of 36.52%. A total of 144 genes were identified in this cp genome, including 79 proteincoding genes, 31 tRNAs and four rRNAs. A phylogenetic tree based on the complete nucleic acid sequence indicated that C. bungeana was classified into Corydaleae and had a close relationship with Lamprocapnos spectabilis.
In greenhouse experiment, the allelopathic effects of 6-barley genotypes were assessed on the morphological features of weeds, Bromus diandrus Roth. and Stelleria media L. The inhibitory effects of root exudates depended on the barley genotype and the physico-chemical properties of the soil, and their interactions. The sandy soils with low organic matter and nutrients content showed more the allelopathic potential. A predictive model of the allelopathic activity of barley was proposed based on soil properties and tested weeds. Overall, the stepwise model showed that the content of phenolic acids was the major determinant of allelopathic activity, besides the soil chemical characteristics (electrical conductivity and carbon and sodium content). Soil microbial communities decreased the allelopathic activity of barley.Drainage and aeration might explain the slightly higher inhibitory activity in a non-autoclaved sandy substrate than a clay-loam substrate. When recommending allelopathic barley genotypes for cultivation, the environmental factors, physico-chemical properties of soil and rhizosphere microbiome might reduce or enhance their allelopathic potential.
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