硼对铝胁迫下油菜幼苗生长及生理特性的影响

为探索硼对油菜（Brassica napus）幼苗铝胁迫的缓解作用，以品种中油杂28为材料，设置2个硼浓度（0.25，25 μmol/L），5个铝浓度（0、50、100、200、400 μmol/L），研究硼对铝胁迫下油菜幼苗生长及生理特性的影响。结果表明：铝胁迫明显抑制油菜幼苗生长，增加膜脂过氧化的产物丙二醛的含量，显著减少叶绿素的含量，进而减少了油菜的生物量。铝胁迫下，相较于低硼处理，加硼显著增加油菜根系的可溶性蛋白、脯氨酸、谷胱甘肽含量，同时降低了铝在油菜体内的积累；且促进合成叶绿素所需的镁元素的吸收，增加油菜的生物量。综上，铝胁迫显著抑制油菜的生长，提高膜脂过氧化程度，加硼不仅弥补了硼不足的问题，同时还可以通过调节抗氧化剂系统，提高蛋白质、脯氨酸含量的积累来抵御铝胁迫。

Effects of boron on growth and physiological characteristics of rape seedlings under aluminum stress

To better understand alleviating effect of boron （B） on aluminum （Al） stress of rapeseed （Brassica napus） seedlings, Zhongyouza 28 was used as experimental material, and 2 B （0.25, 25 μmol/L）, 5 Al （0, 50, 100, 200, 400 μmol/L） were used as treatments. Results showed that Al stress significantly inhibited the growth of rape seedlings, increased the content of malondialdehyde, and product of membrane lipid peroxidation, significantly reduced the content of chlorophyll, and thus reduced the biomass. Under Al stress, compared with low B treatment, B addition significantly increased the contents of soluble protein, proline and glutathione in roots, decreased Al accumulation, promoted the absorption of magnesium to synthesize chlorophyll and increased the biomass of rape. In conclusion, Al stress could significantly inhibit rapeseed growth and improve the degree of membrane lipid peroxidation. While B addition could not only make up for the lack of B, but also resist Al stress by regulating antioxidant system and increasing accumulation of protein and proline content.