| .钒对作物种子发芽及幼苗生长的影响[J].农业环境科学学报,2013,32(5):. |
| 钒对作物种子发芽及幼苗生长的影响 |
| The Effect of V（Ⅴ） on Seed Germination and Seedling Growth |
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| DOI：10.11654/jaes.2013.05.003 |
| 中文关键词: 重金属 种子 发芽 幼苗生长 |
| 英文关键词: heavy metal seed germination seedling growth |
| 基金项目: |
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| 摘要点击次数: 1977 |
| 全文下载次数: 1816 |
| 中文摘要: |
| 通过水培条件下种子发芽试验方法研究了V5+的生物毒性。V5+对萝卜、玉米、油菜、水稻、豆角、南瓜、向日葵7 种作物的种子萌发及幼苗早期生长影响的研究结果表明，V5+抑制油菜、豆角、萝卜种子萌发，但玉米、水稻、南瓜、向日葵的发芽率与对照无显著差异。在作物幼苗生长阶段，无论是在长度还是在重量方面，V5+对所有供试作物生长均表现为抑制作用。油菜、萝卜、向日葵的幼苗根系对V5+胁迫敏感，所有V5+处理浓度（0.05～1.0 mmol·L-1）条件下，其耐性指数均小于0.5，其次为水稻，再次为玉米和南瓜，豆角对V5+存在一定的耐受力。供试作物根长受V5+抑制的程度高于苗高，V5+对供试作物幼苗生长的抑制作用大于对发芽率的抑制。对比不同作物对V5+胁迫的响应，油菜最敏感，其次是水稻，低浓度V5+即可对其幼苗生长产生显著抑制。 |
| 英文摘要: |
| Hydroponic culture experiments were conducted to investigate the effects of V5+ toxicities on plant seeds germination and seedling growth. The results showed that V5+（0~1.0 mmol·L-1） had not remarkable influence on seeds germination of Zea mays, Oryza. sativa L., Cucurbita moschata Duch., and Helianthus annuus Linn., but inhibited the germination of Brassica napus L., Vigna unguiculata（Linn.）Walp, and Raphanus sativus L.. At seedling growth stage，V5+ exhibited significant inhibition effect on all the tested crops on both length and weight. Root of Brassica napus L., Raphanus sativus L. and Helianthus annuus Linn. was sensitive to V5+ stress with tolerance index less than 0.5, followed by Oryza. sativa L., Zea mays, and Cucurbita moschata Duch., but Vigna unguiculata（Linn.）Walp had certain tolerance. The root length of the tested crops was more inhibited than stem length, and seedling growth was more inhibited than germination by V5+. The stem length was 58.4%~112.6% of the control by 0.05 mmol·L-1 V5+ added, while the corresponding value for root length was 19.1%~84.7%. The EC50 value of various seedling biomass under V5+ stress was 0.07~0.92 mmol·L-1, but the EC50 value was 0.39~1.94 mmol·L-1 for germination. Comparing the response of different crops on V5+ stress, Brassica napus L. was the most sensitive, followed by Oryza. sativa L.. |
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