| 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.. |
