施硒对花生幼苗硒、镉吸收及光合效应的影响

发布时间：2018-06-25 00:40

本文选题：花生 + Se　；参考：《环境化学》2017年11期

【摘要】：选用不同富硒(selenium,Se)特性的两个花生品种,采用水培实验,研究了不同Se、镉(cadmium,Cd)浓度下花生的Se、Cd吸收积累、生长发育及光合特征.结果表明,两个品种花生在Cd0.5处理组施加0.6 mg·L~(-1)Se地上部分生物量出现最大值,而在Cd5处理组施加0.2 mg·L~(-1)Se出现最大值.除CK处理外,富Se品种皖花4号地上部分与根系Se含量分别约为非富Se品种丰花4号的2倍和3倍.花生植株Cd含量随着Se浓度的增加呈现下降的趋势,且在低Cd条件下施Se效果最显著.在Se浓度为0.60 mg·L~(-1)时,皖花4号地上部分及根系Cd含量分别下降了26.84%、14.40%,丰花4号则降低了31.63%、10.41%.两个花生品种相比,富Se品种皖花4号Cd的转运系数低于丰花4号,说明花生大量吸收Se能在一定程度上降低Cd向地上部分转运.Cd胁迫抑制了花生的光合过程,表现为最大光化学效率和光合速率降低,施Se后各指标均有所升高.据研究结果推测,适量施Se可有效降低花生对Cd的积累,促进花生生长,而采用富Se品种则效果更佳.
[Abstract]:Two peanut varieties with different selenium rich characteristics were used to study the absorption, accumulation, growth, development and photosynthetic characteristics of Seo CD in peanut with different concentrations of See and cadmium CD. The results showed that the aboveground biomass of two varieties of peanut was maximum in the treatment of CD 0.5 and 0.2 mg L ~ (-1) se in the treatment of CD _ 5 and CD _ (0.5) respectively, and the highest value was found in the aboveground part of the peanut treated with 0.6 mg L ~ (-1) se and 0.2 mg / L ~ (-1) se respectively. Except CK treatment, se content in shoot and root of Wanhua 4 was about 2 times and 3 times as much as that of Fenghua 4, which was a non-se rich variety, respectively. The CD content of peanut plants decreased with the increase of se concentration, and the effect of se application was the most significant under the condition of low CD. When se concentration was 0.60 mg / L ~ (-1), CD content in the aboveground part and root system of Wanhua No. 4 decreased 26.84 and 14.40, respectively, while Fenghua No. 4 decreased 31.63 and 10.41 respectively. Compared with the two peanut varieties, CD transport coefficient of Wanhua 4 was lower than that of Fenghua 4, indicating that the uptake of se in peanut could reduce CD transport to some extent. CD stress inhibited the photosynthetic process of peanut. The maximum photochemical efficiency and photosynthetic rate decreased, and the indexes increased after se application. According to the research results, suitable application of se can effectively reduce the accumulation of CD in peanut and promote the growth of peanut, but the effect of se rich variety is better.
【作者单位】：青岛农业大学资源与环境学院;
【基金】：国家自然科学基金(41101094,41101472)资助~~
【分类号】：X173;X53

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