Characteristic analysis of tetra-resistant genetically modified rice
HU Wen-bin1, 3, DENG Xiang-yang1, DENG Xiao-xiang2, DENG Li-hua1, XIAO You-lun4, HE Xing-jian5, FU Xi-qin2, XIAO Guo-ying1
1 Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, P.R.China 2 State Key Laboratory of Hybrid Rice/Hunan Hybrid Rice Research Center, Changsha 410125, P.R.China 3 University of Chinese Academy of Sciences, Beijing 100049, P.R.China 4 Hunan Plant Protection Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, P.R.China 5 Sericultural Research Institute of Hunan Province, Changsha 410125, P.R.China
Abstract In this study, the characteristic of three transformants named as B1C106-1, B1C106-2, and B1C106-3 were studied that carried three innate resistant genes Bph14, Bph15, and Xa23, and two enthetic resistant genes Cry1Ca# and Bar. The five resistant genes were all verified by PCR and the two enthetic genes were identified in single copy insertion by Southern blot. At tillering stage, the Cry1C and PAT (phosphinothricin acetyl transferase) protein contents in leaf, sheath, and stem of T2 generation were in the similar pattern: leaf>stem>sheath, and showed significant difference (P<0.01) among three organs. The average contents of Cry1C protein in plant of B1C106-1, B1C106-2, and B1C106-3 were 12.95, 6.57, and 11.30 μg g–1, respectively, and showed significant difference (P<0.01) among them. However, the average contents of PAT in plant of B1C106-1, B1C106-2, and B1C106-3 were 28.54, 27.66, and 28.02 μg g–1, respectively, and there were no significant difference among three transformants. The glufosinate tolerable concentration of three transformants of T3 generation reached at least 6 g L–1, and the mortality of rice leaf rollers were above 97.4% in 5 days after being fed with fresh transformants’ leaves. The Cry1C protein toxicity was also assessed by silkworms, and the mortality of silkworms feeding mulberry leaves smeared with Cry1C protein extracts of leaves of B1C106-1, B1C106-2, and B1C106-3 were 90, 67.8, and 87.8%, respectively, that were positive correlation (r=0.993) with Cry1C protein contents in plant of three transformants. The three transformants also maintained high resistance to brown planthopper and bacterial blight as the original version. The above results indicate the tetra-resistant rice germplasm was well-developed by pyramiding innate and enthetic resistant genes in an elite line to provide with resistances of glufosinate, rice leaf roller, brown planthopper, and bacterial blight.
This research was supported by the State Key Science and Technology Programme on Breeding of New Genetically Modified Organisms, China (2011ZX08001-003 and 2016ZX08001-003) and the Open Research Fund of State Key Laboratory of Hybrid Rice (Hunan Hybrid Rice Research Center), China.
HU Wen-bin, DENG Xiang-yang, DENG Xiao-xiang, DENG Li-hua, XIAO You-lun, HE Xing-jian, FU Xiqin, XIAO Guo-ying. Characteristic analysis of tetra-resistant genetically modified rice[J]. Journal of Integrative Agriculture,
2018, 17(03): 493-506.
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