低磷胁迫对柱花草生长及抗氧化系统的影响

以基因型TF291柱花草为供试材料,分析低磷处理（5 μmol/L）对柱花草生长、抗氧化物质及抗氧化保护酶的影响,探索柱花草抗氧化系统在低磷胁迫下的响应机制。结果表明：（1）与对照磷处理（250 μmol/L）相比,低磷处理抑制了柱花草生长,其叶绿素浓度、最大光化学效率、地上部和根部生物量均显著降低（P<0.05）。（2）随着低磷处理时间的增加,15 d时叶片CAT、POD、SOD、ASP、PAL活性和类黄酮含量显著提升（P<0.05）;30 d时叶片CAT、SOD、ASP、PPO活性和MDA、H₂O₂含量显著提高（P<0.05）。本研究结果可为进一步探索低磷胁迫下柱花草抗氧化系统的分子响应机制提供重要依据。

Effects of Low Phosphorus Stress on the Growth and Antioxidant System of Stylosanthes

Using genotype TF291 as the test material, the effects of low phosphorus treatment (5 μmol/L) on the growth, antioxidant and antioxidant enzymes of Stylosanthes were analyzed to explore the response mechanism of the antioxidant system of Stylosanthes under low phosphorus stress. Compared with the control p treatment (250 μmol/L), the low p treatment inhibited the growth of stylox, and the chlorophyll concentration, maximum photochemical efficiency, abovementium and root biomass were significantly reduced (P<0.05). With the increase of the treatment time of low phosphorus, the activity of CAT, POD, SOD, ASP, PAL and the content of flavonoids in leaves were significantly increased at 15 d (P<0.05). The activity of CAT, SOD, ASP, PPO and content of MDA and H₂O₂ in leaves were significantly increased at 30 d (P<0.05). The study would provide an important basis for further exploring the molecular response mechanism of the antioxidant system of Stylosanthes cylindrica under low phosphorus stress.