不同形态硼对油菜幼苗铝毒的缓解效应及其FTIR特征分析

采用水培法,以油菜品种Cao 221167为试验材料,设置无机态硼酸(BA)和有机态山梨醇硼(SB)及不同Al~(3+)(0、100、200和500μmol L~(–1))处理,研究不同形态硼(B)对油菜幼苗铝(Al)毒的缓解作用及不同形态B之间的缓解效应差异,以及利用FTIR(傅里叶红外光谱)技术分析叶片各物质含量的变化。结果表明,Al毒胁迫下,不同形态B(BA和SB)处理,显著提高植株生物量和根系长度(0、100、200和500μmol L~(–1) Al毒胁迫下BA处理根长分别增加了52.15%、101.45%、366.70%和18.73%;SB处理分别增加了46.80%、133.98%、261.36%和10.77%),提高色素含量和SOD活性,而降低了Al含量、MDA含量和POD活性。不同形态B处理下,油菜幼苗在200μmol L~(–1) Al~(3+)处理下长势、生物量及色素含量最高。在500μmol L~(–1) Al~(3+)处理下,油菜幼苗株高、根长、总干鲜重及色素含量显著低于无Al处理;FTIR分析表明,Al毒胁迫下油菜叶片中蛋白质和低聚糖等含量明显上升,加硼明显降低了蛋白质和低聚糖的含量,且BA处理降低幅度明显高于SB处理。说明不同形态B(BA和SB)的添加均明显缓解Al毒,且BA对Al毒缓解效果优于SB,这为农业生产中施用何种硼肥来缓解Al毒起到一定的指导作用。

Mitigative Effect of Different Forms of Boron on Aluminum Toxicity of Rape Seedlings and Its FTIR Characteristics

An experiment was conducted in hydroponics using rape cultivar Cao 221167. Two treatment of B, inorganic borate (BA) and organic boron sorbitol (SB) along with different concentrations of Al3+ (0, 100, 200, and 500 μmol L–1). The effects of different forms of B on activities of antioxidant enzyme of leaves in rape seedlings were studied, and the changes of leaf component were analyzed by Fourier Transform Infrared Spectroscopy (FTIR) technique. Under Al toxicity, the addition of BA or SB could alleviate Al toxicity in plant, and significantly increase plant biomass and root length. The root length increased by 52.15%, 101.45%, 366.70%, and 18.73% in BA treatments and 46.80%, 133.98%, 261.36%, and 10.77% in SB treatments under 0, 100, 200, and 500 μmol L–1 Al3+ toxicity stress, respectively. B treatments increased pigment content and SOD activity and reduced contents of Al, MDA and POD activity. Under the addition of boron (BA or SB), the growth, biomass and pigment content of rape seedlings were higher in 200 μmol L–1 Al3+ treatment than in other treatments. In the 500 μmol L–1 Al3+ treatment, biomass and pigment content of rape seedling were significantly lower than those without Al application. The results from FTIR indicated that the contents of protein and oligosaccharide in leaves of rape seedling significantly increased under Al toxicity, however, significantly decreased when was added boron (BA or SB). In conclusion, the addition of different forms of B (BA or SB) could alleviate Al toxicity and the effect of BA is better than that of SB. The information provided by this study will facilitate alleviating Al toxicity in plant through applying a kind of B fertilizer in agricultural production.