Growth, physiological, and heavy metal accumulation traits at seedling stage under heavy metal stress in castor (Ricinus communis L.)
LYU Dong-Mei,1,2,**, ZHU Guang-Long,1,**, WANG Yue1,**, SHI Yu1, LU Fa-Guang1, REN Zhen1, LIU Yu-Qian1, GU Li-Feng1, LU Hai-Tong1, Irshad Ahmad1, JIAO Xiu-Rong1, MENG Tian-Yao1, ZHOU Gui-Sheng,1,*1Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education, Yangzhou University / Co-Innovation Center for Modern Production Technology in Grain Crops of Jiangsu Province, Yangzhou 225009, Jiangsu, China 2Plant Science Department, MacDonald Campus, McGill University, Montreal H9X3V9, Canada
National Key Research and Development Program of China.2018YFE0108100 National Key Research and Development Program of China.2018YFD0800201 Science and Technology Innovation Cultivating Fund of Yangzhou University.2019CXJ198 Innovation and Promotion of Forestry Science and Technology Program of Jiangsu Province.LYKJ[2019]47 Talent Project of ‘LyuYangJinFeng’ of Yangzhou Government.2018
作者简介 About authors 吕冬梅, E-mail: dongmei. lyu@mail.mcgill.ca;
Abstract Agricultural ecology environment and human health are seriously threated by aggravating agricultural non-point source and heavy metals pollution. It is of great significance to explore the cumulative effect of crops on heavy metal pollution and its physiological mechanism. A castor (Ricinus communis L.) variety Zibi 5 was used to study the accumulation effect of heavy metals and associated physiological mechanism under heavy metals treatments (Cu, Zn and Cd at 0, 30, 60, and 120 mg L-1 concentrations). The results showed that seedling growth, physiological traits and heavy metals accumulation significantly affected by heavy metal treatments. Plant height was increased to the maximum with 60 mg L-1 and then decreased. However, root length, fresh weight and dry weight were all decreased under heavy metal treatments. In general, SOD activity was decreased at low treatment concentration but increased at high treatment concentration, the highest activity was showed at 120 mg L-1 under Cu and Zn treatments at 10 DAS (days after sowing), which were 45.5% and 31.8% higher than that under CK, respectively. POD activity was first decreased and then increased on 10 DAS, but significantly increased in both 25 DAS and 45 DAS, as well as prominently increased with prolonged the growth periods. Soluble protein was only significantly increased under 120 mg L-1 Cu treatment, and increased by 18.8%, 66.7%, and 83.3% at each growth stage, respectively. MDA content was significantly increased with the increase of treatment concentration and significantly decreased with prolonged the growth periods, and MDA content was significant higher under Cd treatment than that under Cu and Zn treatments. The accumulation contents of Cu, Zn, and Cd in castor plant were gradually increased with the increase of treatment concentration, and the maximum accumulation was at 120 mg L-1 concentration. Among of them, the accumulation of treatment concentration increased, and the maximum accumulation showed at 120 mg L-1 concentration. Among them, the accumulation of Zn was the highest, followed by Cd. The accumulation content of heavy metals in each organ was shown as root > stem > leaf. This study suggested that castor has a certain tolerance to heavy metals, which was increased the antioxidase activity to alleviate heavy metals stress. The castor has organ specificity in heavy metals accumulation. It is an effective approach to plant castor to repair soil pollution by heavy metals such as Cu, Zn, and Cd. Keywords:castor;heavy metal stress;growth trait;heavy metal accumulation;physiological mechanism
PDF (512KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 吕冬梅, 朱广龙, 王玥, 施雨, 卢发光, 任桢, 刘昱茜, 顾立峰, 卢海潼, Irshad Ahmad, 焦秀荣, 孟天瑶, 周桂生. 苗期重金属胁迫下蓖麻生长、生理和重金属积累效应[J]. 作物学报, 2021, 47(4): 728-737. doi:10.3724/SP.J.1006.2021.04146 LYU Dong-Mei, ZHU Guang-Long, WANG Yue, SHI Yu, LU Fa-Guang, REN Zhen, LIU Yu-Qian, GU Li-Feng, LU Hai-Tong, Irshad Ahmad, JIAO Xiu-Rong, MENG Tian-Yao, ZHOU Gui-Sheng. Growth, physiological, and heavy metal accumulation traits at seedling stage under heavy metal stress in castor (Ricinus communis L.)[J]. Acta Agronomica Sinica, 2021, 47(4): 728-737. doi:10.3724/SP.J.1006.2021.04146
10 DAS: 播种后第10天; 25 DAS: 播种后第25天。柱上同一时期不同大、小写字母表示处理间在0.05水平上差异显著。 Fig. 1Variation of plant height of castor seedlings under different heavy metals treatments
10 DAS: 10 days after seeding; 25 DAS: 25 days after seeding. Values followed by different capital and small letters above the bar at same growth periods are significantly different among treatments at the 0.05 probability level.
10 DAS: 播种后第10天; 25 DAS: 播种后第25天。柱上同一时期不同大、小写字母表示处理间在0.05水平上差异显著。 Fig. 2Variation of root length of castor seedlings under different heavy metals treatments
10 DAS: 10 days after seeding; 25 DAS: 25 days after seeding. Values followed by different capital and small letters above the bar at same growth periods are significantly different among treatments at the 0.05 probability level.
3种重金属处理下, 蓖麻10 DAS的植株鲜重和干重显著降低, 25 DAS的鲜重和干重仅在Cd处理下减小, 而Cu和Zn处理下无显著规律(表1)。与对照相比, 10 DAS Cu处理下蓖麻鲜重和干重分别下降了12.6%、36.9%、21.0%和30.0%、13.3%、20.0%; Zn处理下鲜重和干重分别降低了24.8%、5.1%、39.7%和13.3%、3.3%、33.3%; Cd处理下分别降低了12.1%、51.4%、19.6%和26.7%、53.3%、13.3%。25 DAS Cd处理下鲜重和干重分别降低了40.2%、30.9%、21.2%和11.5%、8.2%、6.6% (表1)。
Table 1 表1 表1重金属处理下蓖麻幼苗植株的鲜重和干重变化 Table 1Variation of fresh and dry weight under different heavy metals treatments in caster seedlings
处理 Treatment
浓度 Concentration (mg L-1)
10 DAS
25 DAS
鲜重 Fresh weight (g plant-1)
干重 Dry weight (g plant-1)
鲜重 Fresh weight (g plant-1)
干重 Dry weight (g plant-1)
Cu
0
2.14 a
0.30 a
3.11 c
0.61 c
30
1.87 b
0.21 d
3.33 b
0.71 b
60
1.35 d
0.26 b
3.00 d
0.55 d
120
1.69 c
0.24 c
3.75 a
0.81 a
Zn
0
2.14 a
0.30 a
3.11 b
0.61 a
30
1.61 c
0.26 b
2.79 c
0.42 cd
60
2.03 b
0.29 a
3.28 a
0.55 b
120
1.29 d
0.20 c
3.08 bc
0.47 c
Cd
0
2.14 a
0.30 a
3.11 a
0.61 a
30
1.88 b
0.22 c
1.86 d
0.54 b
60
1.04 d
0.14 d
2.15 c
0.56 b
120
1.72 c
0.26 b
2.45 b
0.57 b
DAS: 播种后天数。表中同一列数据后不同小写字母表示在0.05水平上差异显著。 DAS: days after seeding. Values followed by different small letters are significantly different at the 0.05 probability level.
10 DAS: 播种后第10天; 25 DAS: 播种后第25天。柱上同一时期不同小写字母表示在0.05水平上差异显著。 Fig. 3Accumulation of Cu, Zn, and Cd under different heavy metals treatments in seedlings
10 DAS: 10 days after seeding; 25 DAS: 25 days after seeding. Values followed by different small letters above the bar at same growth periods are significantly different at the 0.05 probability level.
柱上同一时期不同小写字母表示在0.05水平上差异显著。 Fig. 4Concentration of heavy metals (Cu, Zn, and Cd) in roots, stems, and leaves under different heavy metals treatments in castor
Values followed by different small letters above the bar at same growth periods are significantly different at the 0.05 probability level.
柱上同一时期不同小写字母表示在0.05水平上差异显著。DAS: 播种后天数。 Fig. 5Variation of SOD activity at different growth periods under different heavy metals concentration in castor
Values followed by different small letters above the bar at same growth periods are significantly different at the 0.05 probability level. DAS: days after seeding.
Table 2 表2 表2重金属处理下不同时期蓖麻植株叶片的POD活性的变化 Table 2Variation of POD activity in leaf at different growth stages under different heavy metals treatments in castor seedlings
处理 Treatment
浓度 Concentration (mg L-1)
POD (U g-1 FW)
10 DAS
25 DAS
45 DAS
Cu
0
51.5 b
50.8 c
89.2 d
30
39.7 d
64.1 b
125.5 c
60
49.8 c
74.3 ab
166.0 b
120
57.5 a
79.5 a
275.0 a
Zn
0
46.8 c
49.8 d
156.3 d
30
32.0 d
70.7 c
175.9 c
60
60.9 b
79.8 b
269.2 b
120
75.3 a
92.5 a
419.0 a
Cd
0
47.5 b
53.2 d
135.1 d
30
26.4 d
59.4 c
246.1 c
60
37.8 c
82.0 a
327.4 a
120
66.6 a
80.2 b
260.2 b
DAS: 播种后天数。表中同一列同一金属处理下各浓度后不同小写字母表示在0.05水平上差异显著。 DAS: days after seeding. Values followed by different small letters are significantly different at the 0.05 probability level.
柱上同一时期不同小写字母表示在0.05水平上差异显著。DAS: 播种后天数。 Fig. 6Content of soluble protein in leaf at different growth periods under different heavy metals concentration in castor bean
Values followed by different small letters above the bar at same growth periods are significantly different at the 0.05 probability level. DAS: days after seeding.
Table 3 表3 表3不同重金属处理下各时期蓖麻叶片的丙二醛含量 Table 3Content of MDA in leaf at different growth periods under different heavy metals concentration in castor
处理 Treatment
浓度 Concentration (mg L-1)
MDA (μmol g-1 FW)
10 DAS
25 DAS
45 DAS
Cu
0
38.5 d
26.2 d
21.2 d
30
75.3 c
43.6 c
33.3 c
60
96.4 b
69.7 b
49.5 b
120
109.5 a
88.5 a
66.8 a
Zn
0
25.2 d
20.6 d
15.3 d
30
56.4 c
35.4 c
19.8 c
60
78.6 b
57.3 b
32.7 b
120
98.2 a
76.1 a
46.8 a
Cd
0
27.4 d
22.4 d
18.3 d
30
83.3 c
41.8 c
27.3 c
60
126.4 b
88.6 b
42.7 b
120
174.1 a
117.2 a
73.6 a
表中各时期同一种金属处理下各浓度后不同小写字母表示在0.05水平上差异显著。DAS: 播种后天数。 Values followed by different small letters are significantly different at the 0.05 probability level. DAS: days after seeding.
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