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3篇 您的检索式：作者名="Shen Shanjiong"

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		题名	作者	年代	出处	被引量
	1	Extra-copy nifA enhances the nodulation efficiency of Sinorhizobium fredii显示文摘Previous investigations have shown that nifA gene is involved in nodulation and symbiotic nitrogen fixation regulation of Rhizobium. We study the role of nifA on nodulation of leguminous plants. We found that Sinorhizo-bium fredii harboring multi-copy plasmid carrying the con-stitutively expressed Klebsiella pneumoniae nifA exhibited an increase of nodulation activity and nodulation competitiveness on soybean plants. The Nod-factor secreted by the rhizobia cells containing the multi-copied nifA was assayed, and preliminary results showed that S. fredii containing the multi-copy plasmid carrying nifA produced higher strength of Nod-factor than the rhizobia containing the same plasmid carrying the vector did.	Zhao Jieping Dai Xiaomi Xu Ling Zhu Jiabi Shen Shanjiong Yu Guanqiao	2002	Chinese Science Bulletin2002，47，7：	2
	2	Functional difference between Sinorhizobium meliloti NifA and Enterobacter cloacae NifA显示文摘The nifA gene is an important regulatory gene and its product, NifA protein, regulates the expression of many nif genes involved in the nitrogen fixation process. We introduced multiple copies of the constitutively expressed Sinorhizobium meliloti (Sm) or Enterobacter cloacae (Ec) nifA gene into both the nifA mutant strain SmY and the wild-type strain Sm1021. Root nodules produced by SmY containing a constitutively expressed Sm nifA gene were capable of fixing nitrogen, while nodules produced by SmY containing the Ec nifA gene remained unable to fix nitrogen, as is the case for SmY itself. However, transfer of an additional Sm nifA gene into Sm1021 improved the nitrogen-fixing efficiency of root nodules to a greater extent than that observed upon transfer of the Ec nifA gene into Sm1021. Comparative analysis of amino acid sequences between Sm NifA and Ec NifA showed that the N-terminal domain was the least similar, but this domain is indispensable for complementation of the Fix? phenotype of SmY by Sm NifA. We conclude that more than one domain is involved in determining functional differences between Sm NifA and Ec NifA.	YANG Chengtao YU Guanqiao SHEN Shanjiong(San Chiun Shen) ZHU Jiabi	2004	Science China(Life Sciences)2004，47，1：	2
	3	Regulatory role of the sequences downstream from nodD3 P1 promoter of Rhizobium meliloti显示文摘The 660 bp region between nodD3 P1 promoter and the following coding region of Rnizopium meliloti has been studied. This region is designated 'downstream sequences' . it consists of two potential open reading frames, ORF1 and ORF2. Studies on the role of the downstream sequences on the activity of nooD3 P1 with nod D3(P1)-/acZ fusion show that deletion of the seguences containing ORF2 causes the increase of the activity of the fusion; on the contrary, addition of extra copies of ORF2 markedly decreases the activity of the fusion. These results indicate that the product of ORF2 plays a negative role in the expression of nod D3.	Bing Zhu Xiaomi Dai Jiabi Zhu Guanqiao Yu Shanjiong Shen	2000	Chinese Science Bulletin2000，45，1：	2

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