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Acta Agronomica Sinica ›› 2023, Vol. 49 ›› Issue (7): 1979-1993.doi: 10.3724/SP.J.1006.2023.24160

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Exogenous salicylic acid improves the tolerance of Yunma 1 (Cannabis sativa L.) to copper stress

XIANG Jia-Ming(), DAI Qian, LIU Li-Jun*()   

  1. College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China
  • Received:2022-07-11 Accepted:2022-11-25 Online:2023-07-12 Published:2023-01-11
  • Contact: *E-mail: liulijun@mail.hzau.edu.cn E-mail:dicerx@163.com;liulijun@mail.hzau.edu.cn
  • Supported by:
    The China Agriculture Research System of MOF and MARA(麻类);The China Agriculture Research System of MOF and MARA(CARS-16-E10)

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Abstract:

Industrial hemp is an important natural fiber crop in China. Its main planting areas are richer in copper mines, and the cultivated soil is seriously polluted by copper. Industrial hemp has strong copper tolerance and high biomass and can replace food crops on copper-contaminated soils. It is of great significance to explore how to enhance its copper tolerance. Salicylic acid (SA) plays an important role in plant stress resistance. In this study, to explore the effect of exogenous SA on the copper tolerance and copper enrichment of industrial hemp under copper stress, the copper-sensitive variety Yunma 1 was used as the experimental material. The results showed that copper stress had obvious toxic effects on industrial hemp. Exogenous SA reduced the copper content of hemp fibers and enhanced the absorption and fixation of Cu2+ in roots. The copper content in underground and the copper accumulation were 1610.1% and 857.1% in stress group, respectively, which may be achieved by improving the metabolism of hemicellulose and xyloglucan and the activity of glucosidase. Exogenous SA promoted the photosynthesis and dry matter accumulation of industrial hemp under copper stress, enhanced significantly the oxidoreductase activity, decreased ROS and MDA content, and reduced oxidative damage. The application of exogenous SA under copper stress can specifically induce the relative expression level of CsCIPK25 and CsWRKY32, and enhance the tolerance of industrial hemp under copper stress by regulating ion transport, and copper absorption immobilization, and metal chelate synthesis.

Key words: industrial hemp, copper stress, salicylic acid, the relative expression level of genes

Table 1

Basic information of copper tailings and common soil"

土壤
Soil		 全氮含量
Total nitrogen content
(g kg-1)		 全磷含量
Total phosphorus content (g kg-1)		 全钾含量
Total potassium content (g kg-1)		 总铜含量
Total copper content (mg kg-1)
铜尾矿砂Copper tailing sand 0.0252 0.542 0.61 1110.72
普通土壤Ordinary soil 1.9148 0.904 4.09 33.35

Table 2

Primers for qRT-PCR"

基因
Gene name		 正义引物
Forward primer (5°-3°)		 反义引物
Reverse primer (5°-3°)
CsCIPK25 GAAATGCTCTGCCTTGGCTAT GTGCCACCTCGTAAACCTCC
CsWRKY32 ATCATTTTGGGCATGTAACGGA TTGGCAGATGTGGATGGGTC
CsUBQ TACTGCGCCAGCTAACAAACC GCACCCGTCTGACCTGAATC

Fig. 1

Effects of copper stress and SA spraying on root growth of Yunma 1 at seedling stage C0: no Cu treatment; C1: copper stress; S0: no SA treatment; S1: SA treatment. Different lowercase letters indicate significant differences between the treatments at P < 0.05."

Fig. 2

Effects of SA treatment on the growth of Yunma 1 under copper stress C0: the ordinary soil; C1: copper tailings sand; S0: no SA treatment; S1: SA treatment. Different lowercase letters indicate significant differences between the treatments at P < 0.05."

Table 3

Effects of exogenous SA on the growth of Yunma 1 under copper stress"

处理
Treatment		 株高
Plant height (cm)		 茎粗
Stem diameter (mm)		 地上部干重
Above-ground dry weight (g)		 地下部干重
Under-ground dry weight (g)
C0S0 204.71±5.76 ab 8.14±0.54 ab 27.19±0.81 a 2.53±0.50 ab
C0S1 206.11±7.24 a 8.91±0.37 a 28.51±2.68 a 2.76±0.61 a
C1S0 146.28±8.61 c 7.36±0.37 b 10.50±0.12 d 1.65±0.29 b
C1S1 195.00±6.73 b 8.90±0.58 a 22.74±1.54 bc 2.22±0.19 ab

Fig. 3

Effects of exogenous SA on reactive oxygen species scavenging system of Yunma 1 at seedling stage under copper stress Treatments are the same as those given in Fig. 1. Different lowercase letters indicate significant differences between the treatments at P < 0.05."

Fig. 4

Effects of exogenous SA on copper enrichment in Yunma 1 under copper stress ACC: the above-ground Cu content; UCC: under-ground Cu content; ACA: the above-ground Cu accumulation; UCA: under-ground Cu accumulation; FCC: fiber Cu content; GI: the germination index; VI: vigor index. Treatments are the same as those given in Fig. 2. Different lowercase letters indicate significant differences between the treatments at P < 0.05."

Fig. 5

Effects of copper stress and SA spraying on the differentially expressed genes of Yunma 1 at seedling stage A: Differential gene expression among treatments in transcriptome; B: Effects of exogenous SA on differential gene expression of industrial hemp under copper stress; C: Differential gene expression among all treatments in the transcriptome. Treatments are the same as those given in Fig. 1."

Fig. 6

GO analysis of differentially expressed genes Treatments are the same as those given in Fig. 1."

Fig. 7

KEGG analysis of differentially expressed genes Treatments are the same as those given in Fig. 1."

Fig. 8

Effects of SA treatment on the differentially expressed genes of Yunma 1 under copper stress Treatments are the same as those given in Fig. 1. Different lowercase letters indicate significant differences between the treatments at P < 0.05."

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