ZHAO Yi,YU Cui-mei,Yang Liu,et al.Differences of Cadmium Stress on Seed Germination and Seedling Growth in the Wild Soybean and Cultivated Soybeans[J].Soybean Science,2019,38(02):267-273.[doi:10.11861/j.issn.1000-9841.2019.02.0267]
野生大豆和不同栽培大豆品种在镉胁迫下种子萌发及幼苗生长的差异
- Title:
- Differences of Cadmium Stress on Seed Germination and Seedling Growth in the Wild Soybean and Cultivated Soybeans
- Keywords:
- Cultivated soybean; Wild soybean; Cadmium stress; Germination; Seedling
- 文献标志码:
- A
- 摘要:
- 为探讨野生大豆和不同栽培大豆品种在镉胁迫下种子萌发的差异,筛选优质的大豆耐镉资源,首先比较5种镉浓度(5,10,25,40 mg?L-1)对野生大豆与栽培大豆的种子发芽率、发芽势、发芽指数、活力指数、根长及芽长等参数,筛选出对镉敏感的性状及适中的镉浓度处理;然后以此为基础比较野生大豆1503、超高产大豆(沈农9号和辽豆14)及普通栽培大豆(辽豆16和沈农20)耐镉性差异。结果表明:野生豆1503和栽培豆辽豆16种子的发芽率、发芽势及发芽指数在较高浓度(25或40 mg?L-1)处理时明显下降,其它浓度处理与对照差异不明显或者高于对照,而活力指数、根长及芽长等指标在较低浓度(5或10 mg?L-1)处理时就表现明显的被抑制效应,尤其对根长抑制更明显。活力指数、根长及芽长对镉胁迫更为敏感,可以作为鉴定耐镉材料及监测镉胁迫对植物的影响的重要指标。在5 mg?L-1镉处理下,1503的活力指数、根长、芽长与对照差异不显著,10 mg?L-1时显著下降,辽豆16在5 mg?L-1时3种参数显著低于对照,因此镉浓度5 mg?L-1的处理适中,可用来比较不同品种的耐镉性。在5 mg?L-1镉处理下,按照3个敏感性状的平均值,筛选出耐镉性较强野生豆1503,镉性较弱的栽培豆沈农20,可用于耐镉育种及耐镉机制研究。
- Abstract:
- To screen the cadmium-tolerant soybean resources, the differences of cadmium stress on the germination and seedling growth of wild soybean and different cultivated soybean seeds were studied.Firstly 5 cadmium concentrations (5,10,25,40 mg?L-1) on the germination rate, germination energy, germination index,vigorin dex, root length and shoot length of wild soybean and cultivated soybean were compared to screen out cadmium sensitive characters and moderate cadmium concentration ,which would be used to compare the cadmium tolerance of wild soybean 1503, super high yield soybean (Shennong 9 and Liaodou 14) and common cultivated soybean (Liaodou 16 and Shennong 20).The results showed that germination rate, germination energy and germination index of the 1503 and Liaodou16 significantly lower than those of control under the treatment of higher concentration(25 or 40 mg?L-1) cadmium.Other treatments were not significantly different from the control group.While the vigor index, root length and shoot length were restrained evidently at lower concentrations (5 or 10 mg?L-1) cadmium and the inhibiting effect of cadmium stress was larger on the root length than the shoot length. The vigor index, root length and bud length were more sensitive to cadmium stress, which could be used as an important indicator to identify cadmium resistant materials and to monitor the degree of cadmium stress. The cadmium concentration of 5 mg?L-1 is moderate, which could be used to compare the cadmium tolerance of different varieties. According to comprehensive effect values in seedlings, 1503 were relatively strong cadmium tolerance, Shennong 20 was relatively weak cadmium tolerance. These soybean materials could be used to explore the tolerance mechanism of soybean under cadmium stress and as important genetic resources in anti-cadmium breeding of soybeans.
参考文献/References:
[1]Yuan X, Wang J, Shang Y E,et al.Health risk assessment of cadmium via dietary intake by adults in China[J].Journal of the Science of Food and Agriculture,2014, 94:373-380.
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备注/Memo
收稿日期:2018-12-14