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Integrated precise orbit determination of Shenzhou IV unmanned spacecraft

science{1.(Technological {2.) 2004年第5期47卷 518-525页

作者： l congmin1,2. gu yidong3,{2., chinese academy of sciences, beijing 100080, china 2. Graduate School of the chinese academy of sciences, beijing 100039, china 3. General Establishment of space science and Application, chinese academy of sciences, beijing 100080, china Correspondence should be addressed to l congmin 1. center for {1. {2. and applied research Chinese Academy of Sciences 100080 Beijing China 2. Graduate School of the{1. 100039 Beijing China 3. General Establishment of space {1. and Application Chinese Academy of Sciences 100080 Beijing China

Considering the characteristic orbit of Shenzhou IV spacecraft and the advantages and disadvantages of several types of domestic orbit measurements, a scheme of IPOD is determined, which uses GPS, SlR and USB observation data jointly plus precise ionosphere corrections to GPS observation data. IPOD system and mathematic models of OD are introduced. The results of different joint OD are analyzed using true observation data, and show that radial accuracy is better than {1.m.

关键词： Shenzhou IV unmanned spacecraft integrated precise orbit determination GPS SlR USB.

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The Class Ⅲ peroxidase gene OsPrx30,transcriptionally modulated by the AT-hook protein OsATH1. mediates rice bacterial blight-induced ROS accumulation

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Journal of Integrative Plant Biology 2021年第2期63卷 393-408页

作者： Hao liu Shuangyu Dong Ming li Fengwei gu guili Yang Tao guo Zhiqiang Chen Jiafeng Wang National Engineering research {1. of Plant {2. Breeding South China Agricultural UniversityGuangzhou 510642China guangdong Provincial Key laboratory of Crop Genetic Improvement Crops Research InstituteGuangdong Academy of Agricultural SciencesGuangzhou 510640China

Class Ⅲ peroxidases(CⅢ Prxs) play critical roles in plant immunity by scavenging reactive oxygen species(ROS). However, the functions of CⅢ Prxs in rice(Oryza sativa l.) immunity are largely unexplored. Here, we report a Prx precursor, OsPrx30,that is responsive to the bacterial blight Xanthomonas oryzae pv. oryzae(Xoo). OsPrx30 was primarily expressed in rice roots, leaves, and stems,and its protein product was mainly localized at the endoplasmic reticulum. Overexpression of OsPrx30 enhanced the plant’s susceptibility to Xoo by maintaining a high level of peroxidase(POD) activity and reducing the content of H2.2. whereas depletion of OsPrx30 had the opposite effects. Furthermore, we identified an AT-hook transcription factor, Os ATH1. that is specifically bound to the OsPrx30 promoter. As observed in plants overexpressing OsPrx30, depletion of Os ATH1.enhanced susceptibility to Xoo. Finally, we demonstrated that depletion of Os ATH1.increased histone H3 acetylation at the AT-rich region of the OsPrx30 *** together, these results reveal a mechanism underlying the POD-induced natural resistance to bacterial diseases and suggest a model for transcription regulation of Prx genes in rice.

关键词： AT-hook protein histone acetylation Prxs rice bacterial blight ROS

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