Pyrrosia bonii is an important ornamental and medical fern from Polypodiaceae. Its complete chloroplast genome sequence was characterized through de novo assembly with Illumina sequencing data. The genome size is 158,174 bp, with large single copy (LSC, 82,479 bp) and small single copy (SSC, 21,723 bp) regions separated by a pair of inverted repeats (IR, 26,986 bp). A total of 132 genes were identified, including 88 protein coding genes, 35 tRNA genes, eight rRNA genes, and one pseudogene. Maximum-likelihood phylogenetic tree revealed that P. bonii was most closely related to Lepisorus clathratus . The study will greatly facilitate the chloroplast phylogenomics of Polypodiaceae.

We reported the complete chloroplast genome of Pyrrosia calvata, a traditional Chinese medicinal fern only restricted to Guangxi, China. Its genome is 158,201 bp in length with 41.59% GC content and includes two inverted repeats (IRs) of 26,983 bp separated by LSC and SSC of 82,517 bp and 21,718 bp, respectively. A total of 131 genes are predicted, including 88 protein-coding genes, 34 tRNA genes, eight rRNA genes, and one pseudogene. ML tree indicates that P. calvata is sister to Lepisorus clathratu. This study provides a new perspective to explore the phylogenetic relationship of Pyrrosia.

China Robot Competition, which integrates the theory and practice of multi-disciplinary intelligent robot system, is one of the most influential robot competitions in China. In this paper, we apply RRT * and APF to the Middle Size Simulation League of soccer on ROS and propose an attack strategy based on extremum. Our experiments showed that the implementation of RRT* and APF optimizes the multiple iterations existing in original obstacle avoidance algorithm and greatly improves the performance of robots when there are fewer obstacles and the maximum speed of obstacle avoidance is limited. Besides, our attack strategy has proved effective on boosting the chances of goal and helped the Central South University to win the championship of China Robot Competition Middle Size Simulation League in 2021.