摘要：[Objective] This study aimed to explore the molecular mechanism of senescence in ethylene-insensitive flowers. [Method] The dahlia petals were used as matedal, and the senescence-associated proteins were isolated and identified using two-dimensional electrophoresis, mass spectrometry and an encoding gene was cloned using molecular biology techniques. [Result] In the two-dimensional elec- trophorogram of proteins from dahlia petals at building color, full flowering and flow- er senescence pedods, a total of 44 protein spots with differences in expression level more than two times were detected. From the 44 protein spots, xyloglucan （XTHs）, a senescence-associated protein, was iso- lated and identified and its expression level was increased continuously with the senescence process of dahlia petals. By using the total RNA of dahlia petals as matedal and a pair of degenerate pdmers, the cDNA sequence of XTH gene was cloned by RT-PCR. The encoding region of XTH gene has a full length of 882 bp, encoding 293 amino acid residues, and is named as DpXTH1 （Accession number： HM053613.1）. The cluster analysis showed that the amino acid sequence of DpXTH1 has high homology with those of XTHs in other plants. [Conclusion] The isolated and identified DpXTH1 from dahlia petals belonged to the XTH family in plants, and its biological function was associated with the senescence process and regulation of dahlia petals.

摘要：传统数码印花机采用PC完成图像数据处理和传输,数据带宽低,喷印速度慢。为此,设计以Tilera嵌入式多核处理器为核心的高速数码印花系统。系统通过两路千兆光纤以太网接收图像数据,采用多核处理器实时完成数据解压缩和图像转置。提出移位转置的算法来代替遍历转置算法,使转置效率得到明显提升。处理器以共享内存与mailbox技术方式实现不同核之间的数据共享与同步,大大提高了系统的工作效率。另外利用现场可编程门阵列(FPGA)完成数据格式转换和喷印输出。测试结果表明,系统连接8个喷头的总输出带宽可达1.9 Gb/s,支持分辨率600 dot/inch下高达720 m2/h的喷印速度。