关键词:海岛棉; 枯萎病; 类黄酮; 表达分析; 转录组测序 Correlation between Fusarium wilt Resistance and Expression Levels of Genes Involved in Flavonoid Metabolism Pathway in Gossypium barbadense L HUANG Qi-Xiu, QU Yan-Ying, YAO Zheng-Pei, LI Meng-Yu, CHEN Quan-Jia* College of Agronomy / Key Laboratory of Agriculture Biological Technology, Xinjiang Agricultural University, Urumqi 830052, China Fund:This study was supported by the National Natural Science Foundation of China (31560409) AbstractFusarium wilt is one of the important factors threatening the production of island cotton ( Gossypium barbadense L.). Understand the molecular mechanism of Fusarium wilt resistance will facilitate cotton breeding against Fusarium wilt and therefore alleviate the problem in cotton production. On the basis of RNA-seq results in previous studies, differentially expressed genes (DEG) were further analyzed in this study. After inoculating the pathogenic fungus for 0-40 hours, the DEGs expression levels of seven varieties in different wilt resistance were studied using qRT-PCR method. The correlation between gene expression level and disease index was analyzed. The flavonoid biosynthetic pathway genes were found to be related to Fusarium wilt resistance. The qRT-PCR result indicated the significantly higher expression levels of flavonoid metabolic pathway genes in resistant genotypes than those susceptible genotypes. The expression levels of TT7, CHI, and DFR, the key genes in flavonoid metabolic pathways, were significantly higher in resistant genotypes than in susceptible genotypes ( P < 0.05 or P < 0.01) at several time points after inoculation. Particularly, the expression levels of CHIand DFRwere negatively correlated with disease index. Therefore, we conclude that the flavonoid metabolic pathway related genes might be involved in the resistance to Fusarium wilt in cotton, among which CHI, TT7, and DFRare the key genes.
Keyword: Gossypium barbadense; Fusarium wilt; Flavonoids; Expression analysis; RNA-seq Show Figures Show Figures
表4 转录组测序中类黄酮代谢相关基因的表达 Table 4 Expression of related genes in flavonoids by RNA-seq
基因 Gene
品种 Variety
表达趋势 Expression trend
差异倍数 Fold change
基因 Gene
品种 Variety
表达趋势 Expression trend
差异倍数 Fold change
CHS
06-146
Up
15.81
LDOX/ANS
06-146
Up
13.30
RIL 10893
Up
23.90
RIL 10893
Up
11.36
RIL 10895
Up
4.88
RIL 10895
Up
2.80
Xinhai 14
Up
2.34
Xinhai 14
Up
2.00
RIL 10796
Up
2.18
RIL 10796
Up
1.53
RIL 10897
Up
2.15
RIL 10897
Up
1.18
CHI-1
06-146
Up
11.54
DFR-1
06-146
Up
8.27
RIL 10893
Up
9.22
RIL 10893
Up
8.35
RIL 10895
Up
2.52
RIL 10895
Up
1.38
Xinhai 14
Up
1.03
Xinhai 14
Up
1.02
RIL 10796
Up
1.83
RIL 10796
Down
0.46
RIL 10897
Up
1.06
RIL 10897
Up
1.18
CHI-2
06-146
Up
12.99
DFR-2
06-146
Up
8.17
RIL 10893
Up
10.97
RIL 10893
Up
9.12
RIL 10895
Up
2.63
RIL 10895
Up
3.23
Xinhai 14
Up
1.45
Xinhai 14
Up
1.68
RIL 10796
Up
2.01
RIL 10796
Up
1.25
RIL 10897
Up
1.84
RIL 10897
Up
1.74
TT7-1
06-146
Up
11.54
ANR
06-146
Up
6.37
RIL 10893
Up
10.61
RIL 10893
Up
4.97
RIL 10895
Up
6.10
RIL 10895
Up
2.04
Xinhai 14
Up
5.90
Xinhai 14
Up
1.28
RIL 10796
Up
4.50
RIL 10796
Down
0.94
RIL 10897
Up
4.04
RIL 10897
Up
1.29
TT7-2
06-146
Up
5.72
RIL 10893
Up
4.50
RIL 10895
Up
2.62
Xinhai 14
Up
1.89
RIL 10796
Down
0.90
RIL 10897
Up
1.72
The same gene has two forms, for example, CHI gene is displayed as CHI-1 and CHI-2, in fact, CHI-1and CHI-2 are similar to the same sequence of TAIR, this phenomenon is caused by different parts of a sequence alignment. But its expression trends are similar. So in the following gene analysis process unified the display for CHS. 在表中出现同一基因的2个表达, 例如: CHI基因为CHI-1和CHI-2, 实际上CHI-1和CHI-2序列均与拟南芥库中的同一个基因相似, 这种现象是由比对到序列部位不同而导致, 但其表达趋势均类似。因此后续基因分析过程中统一用CHI代表。
表4 转录组测序中类黄酮代谢相关基因的表达 Table 4 Expression of related genes in flavonoids by RNA-seq
表6 抗、感材料间基因表达量方差分析 Table 6 Variance analysis of gene expression between resistant and susceptible varieties
基因 Gene
接菌后时间 Times after inoculation
4 h
10 h
18 h
28 h
40 h
CHI
2.283
16.527* *
15.362* *
11.335* *
9.414* *
DFR
6.991*
32.341* *
19.942* *
5.232*
12.719* *
TT7
3.094
4.641*
2.529
11.492* *
37.741* *
ANR
3.268
0.773
6.473*
0.421
13.133* *
C4H
1.596
4.316
1.921
1.323
16.759* *
CHS
0.011
1.910
4.446*
0.882
9.133* *
LDOX
2.225
6.885*
0.317
6.990*
13.033* *
FLS
1.348
5.079*
3.690
6.276*
30.590* *
* and * * indicate significant difference between resistant and susceptible genotypes at P< 0.05 and P< 0.01, respectively. * 和* * 分别表示在P< 0.05和P< 0.01水平抗、感材料间差异显著。
表6 抗、感材料间基因表达量方差分析 Table 6 Variance analysis of gene expression between resistant and susceptible varieties
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