Chin Bull Bot ›› 2015, Vol. 50 ›› Issue (2): 198-205.doi: 10.3724/SP.J.1259.2015.00198

• 研究报告 • Previous Articles     Next Articles

Genetic Analysis and Gene Mapping of a Rice Spreadingpanicle Mutant

Dan Liu, Jiayu Wang, Jin Liu, Dianrong Ma, Minghui Zhao, Wenfu Chen*   

  1. Rice Research Institute of Shenyang Agricultural University/Key Laboratory of Northeast Rice Biology, Genetics and Breeding of Ministry of Agriculture/Key Laboratory of Northern Japonica Super Rice Breeding, Ministry ofEducation, Shenyang 110866, China
  • Received:2014-04-01 Accepted:2014-05-14 Online:2015-04-10 Published:2015-03-01
  • Contact: Liu Dan,Wang Jiayu,Chen Wenfu
  • About author:

    ? These authors contributed equally to this paper


Rice is the most important crop in our country, and the panicle traits determine the yield and quality of rice. From recombinant inbred lines derived from a cross between Akihikari (japonica) and Qishanzhan (indica), a spreading- panicle mutant (sp) was found that had panicle branches extending outward, increased angle between primary branch and rachis and the panicle grew around this. As compared with the wild-type parent, sp showed significantly reduced panicle weight, grain weight per panicle, 1 000 grain weight, grain width and grain thickness, which implied that the sp gene participated in regulating panicle formation and glumous flower development. Genetic analysis showed that the sp phenotype was controlled by a single dominance nuclear gene. Primary mapping based on the F2 line between sp and 02428 showed that the sp gene was on the long arm of chromosome 4 and at a 62.9 kb region between markers E3 and RM17578. This information provides a basis for cloning this gene and functional mechanism analysis.

Figure 2

The genotype of rice sp distributing on the 12 chromosomes"

Figure 2

Phenotype of rice spreading panicle mutant and parents (A) Phenotype of the sp mutant (Bar=30 cm); (B) Panicle phenotype of sp and Akihikari at anthesis stage (Bar=5 cm); (C) Panicle phenotype of sp at late grain filling stage (Bar=5 cm); (D) Panicle phenotype of sp at ripening stage (Bar=5 cm)"

Figure 3

Scanning electron microscope (SEM) observation of rice sp and parents at ripening stage (A) sp; (B) Akihikari; (C) Qishanzhan. Bar=1 mm"

Table 1

Main agronomic traits of the rice sp mutant and the parents (means±SD)"

Characters sp Akihikari
Panicle weight (g) 2.75±0.34** 3.43±0.14
Grain weight per panicle (g) 2.60±0.31** 3.31±0.13
1 000 grain weight (g) 20.06±0.12** 22.13±0.41
Grain length (mm) 6.98±0.28 7.34±0.24
Grain width (mm) 2.90±0.15** 3.48±0.10
Grain thickness (mm) 2.03±0.04** 2.28±0.10
Plant height (cm) 145.40±2.86** 114.77±4.28
Spikelet number per panicle (ea) 146.80±17.09 160.80±13.61
Primary branch number (ea) 13.60±0.89 12.80±0.45
Second branch number (ea) 21.60±4.28 25.80±2.68

Table 2

Genetic analysis of rice spreading panicle mutant"

Phenotype Observed value Expected value χ2-test
Wild-type (compact panicle) 70 85 3.30
sp (spreading panicle) 270 255

Figure 4

Co-separation of F1 marker in sp/02428 F2 recessive plant population P1: sp; P2: 02428; Plants of 1-70: Recessive plants in F2 population"

Table 3

Seven polymorphic markers for SP mapping"

Primer name Forward sequence (5′-3′) Reverse sequence (5′-3′)
M2 cttcagcttggacaggcgatg gaaaagagatgtctggacg
RM348 ccgctactaatagcagagag ggagctttgttcttgcgaac

Figure 5

Linkage mapping of SP on the chromosome 4 of rice"

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