Introgression of qPE9-1 allele, conferring the panicle erectness, leads to the decrease of grain yield per plant in japonica rice (Oryza sativa L.)

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• 作者：Xiuhua Yi¹ ; ^a ; Zujian Zhang¹ ; ^a ; Shengyuan Zeng^a ; Chunyan Tian^a ; Juncheng Peng^a ; Min Li^a ; Yue Lu^a ; Qingcai Meng^a ; Minghong Gu^a ; Changjie Yan ; ^a ; ^{yichuan@yzu.edu.cn"" rel=""nofollow}
• 关键词：Rice ; Erect panicle ; Genetic analysis ; qPE9-1
• 刊名：Journal of Genetics and Genomics
• 出版年：2011
• 出版时间：20 May 2011
• 年：2011
• 卷：38
• 期：5
• 页码：217-223
• 全文大小：373 K

文摘

Panicle architecture is closely related to yield formation. The qPE9-1 gene has been proved to be widely used in high-yield rice cultivar developments, conferring erect panicle character in japonica rice. Recently, qPE9-1 has been successfully cloned; however, the genetic effect on grain yield per plant of the erect panicle allele qPE9-1 is controversial yet. In the present study, a drooping panicle parent Nongken 57, carrying qpe9-1 allele, was used as recurrent parent to successively backcross to a typical erect panicle line from the double haploid (DH) population (Wuyunjing 8/Nongken 57), which was previously shown to carry qPE9-1 allele. Thus a pair of near-isogenic lines (NILs) was developed. The comparison of agronomic traits between the NILs showed that, when qpe9-1 was replaced by qPE9-1, the panicle architecture was changed from drooping to erect; moreover, the panicle length, plant height, 1000-grain weight and the tillers were significantly decreased, consequently resulting in the dramatic decrease of grain yield per plant by 30 % . Therefore, we concluded that the qPE9-1 was a major factor controlling panicle architecture, and qPE9-1 had pleiotropic nature, with negative effects on grain yield per plant. This result strongly suggests that the erect panicle allele qPE9-1 should be used together with other favorable genes in the high-yield breeding practice. In addition, the effect of qPE9-1 on eating and cooking quality was also discussed in the present study.