研究论文

Development of Specific Markers for Pigm in Marker-Assisted Breeding of Panicle Blast Resistant japonica Rice

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  • Zhenjiang Institute of Agricultural Sciences of the Ning-Zhen Hilly District, Jurong 212400, China;
*Corresponding author, E-mail: 1179809265@qq.com

Received date: 2017-11-09

  Revised date: 2018-01-30

  Online published: 2018-09-10

Abstract

【Objective】 Pigm is a broad-spectrum resistance gene to rice blast, which is isolated from Gumei 4, a variety with durable resistance. Pigm is allelic to Piz, Piz-t, Pi2, Pi9, Pi40 and so on, but shows different resistance spectrum. To breed resistance variety carrying Pigm with molecular marker-assisted selection, discovering Pigm-tightly-linked markers is important.【Method】We identified a unique DNA sequence of Gumei 4 by genomic sequencing, and developed a set of specific markers tagged to Pigm base on the sequence divergence. Then, by means of molecular-assisted selection and background gene screening, Pigm was pyramided to three representative japonica varieties belonging to different ecotypes from Yangtze-Huai River Area. 【Result】 An InDel marker Pigm-4 which is closely linked to the functional unit of Pigm was developed. Pigm-4 showed distinct specificity by genotype screening of various rice varieties, and can distinguish the genotype of Pigm from its alleles Piz, Piz-t, Pi2, Pi9 and Pi40. Although receptors carry with resistant genes such as Pib+Pi54 (Wuyun 2674), Pib+Pita (Wuyunjing 27), Pib+Pi54+Pb1 (Zhendao 18), respectively, but none of them can defense high virulence blast pathogen. Relevant introgression lines were established and inoculations of introgression lines indicate that Pigm can promote resistance level to rice panicle blast significnatly in different japonica backgrounds. 【Conclusion】Pigm can be used as a beneficial gene source in the breeding of blast resistant japonica rice, and Pigm-4 is an excellent marker for the molecular marker-assisted selection of Pigm.

Cite this article

Shengyuan ZENG, Chuang LI, Cancan DU, Liting SUN, Dedao JING, Tianzi LIN, Bo YU, Huafei QIAN, Weicheng YAO, Yiwen ZHOU, Hongbing GONG . Development of Specific Markers for Pigm in Marker-Assisted Breeding of Panicle Blast Resistant japonica Rice[J]. Chinese Journal OF Rice Science, 2018 , 32(5) : 453 -461 . DOI: 10.16819/j.1001-7216.2018.7135

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