Transgenic Rice Plants Harboring Genomic DNA from Zizania latifolia Confer Bacterial Blight Resistance

Abstract

Abstract: Based on the sequence of a resistance gene analog FZ14 derived from Zizania latifolia (Griseb.), a pair of specific PCR primers FZ14P1/FZ14P2 was designed to isolate candidate disease resistance gene. The pooled-PCR approach was adopted using the primer pair to screen a genomic transformation-competent artificial chromosome (TAC) library derived from Z. latifolia. A positive TAC clone (ZR1) was obtained and confirmed by sequence analysis. The results indicated that ZR1 consisted of conserved motifs similar to P-loop (kinase 1a), kinase 2, kinase 3a and GLPL (Gly-Leu-Pro-Leu), suggesting that it could be a portion of NBS-LRR type of resistance gene. Using Agrobacterium-mediated transformation of Nipponbare mature embryo, a total of 48 independent transgenic T0 plants were obtained. Among them, 36 plants were highly resistant to the virulent bacterial blight strain PXO71. The results indicate that ZR1 contains at least one functional bacterial blight resistance gene.

Key words: Zizania latifolia, transformation-competent artificial chromosome library, resistance-gene analog, Oryza sativa, bacterial blight resistance, gene transfer

SHEN Wei-wei, SONG Cheng-li, CHEN Jie, FU Ya-ping, WU Jian-li, JIANG Shao-mei. Transgenic Rice Plants Harboring Genomic DNA from Zizania latifolia Confer Bacterial Blight Resistance[J]. RICE SCIENCE, 2011, 18(1): 17-22 .

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