关键词:小麦; 抗叶锈病基因; Lr24; SSR标记; 分子作图 Molecular Identification of Leaf Rust Resistance Gene in Wheat Line 5R625 QIN Jin-Yan1, LI Zai-Feng2, YAN Xiao-Cui1, SU Ji-Hua1, YAO Zhan-Jun1,*, LIU Da-Qun2,* 1College of Agronomy, Agricultural University of Hebei / North China Key Laboratory for Germplasm Resources of Education Ministry, Baoding 071001, China
2College of Plant Protection, Agricultural University of Hebei / Biological Control Center for Plant Disease Pests of Hebei Province, Baoding 071001, China
AbstractWheat line 5R625 shows high resistance to all of Puccinia triticina pathotypes at seedling and adult plant stages, but its resistance mechanism is unclear. In this study, the resistance gene(s) were postulated by artificially inoculating 15 P. triticina pathotypes at the seedling stage and comparing infection types with those of 36 wheat lines with known Lr genes. The result showed that 5R625 might carry Lr9, Lr19, Lr24, Lr28, Lr39, Lr47, Lr51, and Lr53. Further genetic analysis to confirm the resistance gene(s) was carried out using the populations of Fl, F2, and F2:3 derived from the cross between 5R625 and Zhengzhou 5389 (susceptible control). A single dominant gene was found responsible for the resistance at seedling and adult plant stages. This gene was mapped on 3DL chromosome with molecular markers using the F2:3 lines. The linkage map contained five closely linked markers, including STS marker 24-16 and SCAR marker OP-J09 that have proved to be cosegregated with Lr24. Therefore, the leaf rust resistance gene in 5R625 is most likely Lr24.
Keyword:Wheat; Leaf rust resistance gene; Lr24; SSR markers; Molecular mapping Show Figures Show Figures
表1 小麦品系5R625和36个已知Lr基因的对照系对15个叶锈菌株的苗期侵染型 Table 1 Seedling infection types against 15 pathotypes of Puccinia triticina in 5R625 and 36 wheat lines with known Lr genes
小麦品系 Wheat line
基因 Lr gene
叶锈菌小种 Pathotype of Puccinia triticina
PHKS
MHJS
FHDQ
FGBQ
FHBR
FHBQ
FGBR
THJL
FHDR
FGDQ
FHDS
THJP
TGTT
PHGP
THJC
RL6003
Lr1
4
4
;
;
;
;
;
4
0
;
0
4
4
4
4
RL6016
Lr2a
;
;
1+
;
;
1
1
3
;
;
2
3
3
;
4
RL6047
Lr2c
4
1
4
4
4
4
4
4
4
4
4
4
4
4
4
RL6002
Lr3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
RL6010
Lr9
;
;
;
;
0;
0
0
;
0
0
;
;
;
0
;
RL6005
Lr16
4
4
4
4
4
4
3+
3+
4
4
4
4
4
3
4
RL6064
Lr24
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
RL6078
Lr26
4
4
4
1
4
4
;
4
4
1
4
4
2
4
4
RL6007
Lr3ka
X
X
;
;
;
;
1
1
;
;
;
1
4
;
X
RL6053
Lr11
4
4
1
;
;
1+
2
3+
1
1
2
4
3+
4
4
RL6008
Lr17
4
3+
3+
2
2
2
2+
4
3+
4
4
4
4
2+
4
RL6049
Lr30
3C
1
1
;
;
;
;
1
;
;
;
;
4
;
1
RL6051
LrB
3+
4
4
4
3+
4
4
3+
4
4
4
4
4
4
X
RL6004
Lr10
3
3
4
4
4
4
4
2
4
4
4
2+
4
1
X
RL6013
Lr14a
4
4
X
X
X
X
X
X
X
2
4
4
4
3+
X
RL6009
Lr18
1
1+
2
2
4
2
4
1+
4
2+
2
4
3+
3C
3
RL6019
Lr2b
1
0 ;
4
;
3
3+
2
4
3
3+
3+
2
4
3C
4
RL6042
Lr3bg
4
4
4
4
4
3+
4
4
4
4
4
4
4
4
4
RL4031
Lr13
3
4
4
3
3
4
4
3
3
2
3+
4
4
4
4
RL6006
Lr14b
4
4
4
4
4
4
4
4
4
4
4
X
4
X
4
RL6052
Lr15
1
;
;
;
;
;
;
4
1
;
;
4
3+
4
4
RL6040
Lr19
0
0
;
0
0
;
0
0
0
0
;
0
0
0
;
RL6092
Lr20
4
4
;
;
;
;
0
;
;
;
;
4
1
4
;
RL6043
Lr21
4
2
2
;
2+
3
2
;
1
;
1+
;
3
1
1
RL6012
Lr23
4
4
4
3+
3+
4
3+
1
4
4
4
4
4
3+
4
RL6079
Lr28
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
RL6080
Lr29
0
0
0
0
;
0
0
;
;
0
3+
4
;
0
0
RL6057
Lr33
3
4
3+
3+
3+
4
2+
3C
3+
3
4
4
4
3+
3+
E84018
Lr36
4
2
1+
;
2
2
1
1
2
2+
3
2+
3+
2+
3+
KS86NGRC02
Lr39
;
; 1
;
;
;
;
;
;
;
;
;
;
;
;
;
KS91WGRC11
Lr24/Lr42
;
;
;
0
0
;
;
;
1
;
;
0
;
0
1
RL6147
Lr44
1
;
4
4
4
4
4
1
4
4
4
;
1+
; 1
1
RL6144
Lr45
4
4
4
4
4
4
4
;
4
4
4
4
;
;
;
PAVON+Lr47
Lr47
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
C78.5
Lr51
;
;
;
;
1
;
0
;
;
;
;
0
;
;
;
-98M71
Lr53
;
0
0
0
0
0
0
;
0
0
0
0
0
0
0
5R625
Lr5R625
0
0
;
;
;
;
0
;
0
0
;
0
;
0
0
郑州5389 Zhengzhou 5389
+
4
4
4
4
3+
4
4
4
4
4
4
4
4
4
4
Infection type (IT) was recorded in a 0-4 scale [21]. “ +” indicates uredinia somewhat larger than usual degrees for the IT, “ C” indicates more than usual degrees of chlorosis and necrosis, and “ X” indicates heterogeneous infection appears on the same leaf. 侵染型按0~4级标准[21]记载, +表示叶锈菌侵染状况比正常该侵染等级严重, C表示叶片上褪绿和坏死现象比正常该等级严重, X表示混合侵染型, 即在同一叶片上分布有多种侵染型。
表1 小麦品系5R625和36个已知Lr基因的对照系对15个叶锈菌株的苗期侵染型 Table 1 Seedling infection types against 15 pathotypes of Puccinia triticina in 5R625 and 36 wheat lines with known Lr genes
图1 叶锈菌生理小种THJP对感病亲本郑州5389(左)和抗病亲本5R625(右)的苗期侵染型Fig. 1 Seedling infection types of susceptible parent Zhengzhou 5389 (left) and resistant parent 5R625 (right) in response to Puccinia triticina pathotype THJP
表2 Table 2 表2(Table 2)
表2 5R625与郑州5389杂交后代的叶锈病抗感分离 Table 2 Segregation of leaf rust resistance in the progenies derived from the cross between 5R625 and Zhengzhou 5389
群体 Population
侵染型 Infection type
抗病株 Resistant plants
感病株 Susceptible plants
χ 23:1
P
0
;
1
2
3
4
5R625
4
16
20
0
郑州5389 Zhengzhou 5389
20
0
20
F1
18
2
20
0
F2苗期 F2 at seedling stage
33
19
52
8
30
104
38
0.235
0.644
F2成株期 F2 at adult stage
92
12
2
38
106
38
0.148
0.699
The resistance of F2 plants was identified at seedling and adult stages using different populations. The inoculants were Puccinia triticina pathotype THJP at seedling stage and pathotype mixture at adult stage. 分别进行两套F2材料苗期和成株期鉴定, 苗期接种叶锈菌生理小种THJP, 成株期为多个强毒性小种混合接种。
表2 5R625与郑州5389杂交后代的叶锈病抗感分离 Table 2 Segregation of leaf rust resistance in the progenies derived from the cross between 5R625 and Zhengzhou 5389
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