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KMID : 0368420120550030218
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Journal of Plant Biology
2012 Volume.55 No. 3 p.218 ~ p.225
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Fine mapping of Pa-6 gene for purple apiculus in rice
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Liu Xu
Sun Xu
Wang Wenying
Ding Hanfeng
Liu Wei
Li Guangxian
Jiang Mingsong
Zhu Changxiang
Yao Fangyin
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Abstract
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Purple apiculus is one of the important agronomic traits of rice. Single-segment substitution line (SSSL) W23-07-6-02-14 in the genetic background of an elite rice variety Huajingxian74 (HJX74) with the substituted interval of RM225-RM217-RM253 on the chromosome 6 was found to have purple apiculus (Pa). To map the gene governing Pa, W23-07-6-02-14 was crossed with the recipient HJX74 to develop an F2 secondary segregation population. The ratio of purple apiculus to green apiculus showed a good fit to 3:1 ratio, indicating that Pa was controlled by a major dominant gene. The gene locus for Pa was tentatively designated as Pa-6. Using 430 individuals from the F2 segregation population, the Pa-6 locus was mapped between two SSR markers RM19556 and RM19561 with genetic distances of 0.2 and 0.3 cM, respectively. For fine mapping of the Pa-6 gene, a large F2:3 segregation population of 3890 individuals was developed from F2 heterzygous plants in the RM19556-RM19561 region. Recombinant analyses further mapped the Pa-6 gene locus to an interval of 41.7-kb bounded L02 and RM19561. Sequence analysis of this 41.7-kb region revealed that it contains eleven open reading frames (ORFs), of which, ORF5 is classified as the one that is associated with the C (chromogen for anthocyanin) gene, it was presumed to be the candidate gene for Pa. This result provided a foundation of map-based cloning and function analysis of the Pa-6 gene.
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KEYWORD
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Pa-6, Physical mapping, Purple apiculus, Rice, Single-segment substitution line (SSSL)
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