SophoraDavidii,一种重要的牧草物种,主要生长在中国西南部的亚热带喀斯特山脉。它对恶劣的土壤条件和干旱环境的适应能力使其成为这些地区生态恢复的理想先驱物种。这项研究调查了酸性,当地富铝土壤对大黄沙棘萌发及幼苗生长生理的影响.实验是在不同程度的酸度和铝应力下进行的,采用三个pH值(3.5至5.5)和四个铝浓度(0.5至2.0mmol·L-1)。结果表明,发芽率,发芽指数,在微酸性条件下(pH4.5-5.5),大黄沙棘种子的活力指数下降但不明显,而强酸(pH=3.5)显著抑制发芽率,发芽指数,与对照组相比,白皮种子的活力指数。铝胁迫(≥0.5mmol·L-1)显著抑制发芽率,发芽指数,和活力指数。此外,幼苗根系对铝浓度的变化敏感,明显的根系生长抑制,以根缩短和颜色加深为特征。值得注意的是,在铝应力(pH=4.3)下,随着铝浓度的增加,达维迪沙门氏菌中丙二醛和脯氨酸的含量逐渐升高,而抗氧化酶活性表现出最初的增加,然后下降。该研究强调了细胞渗透调节物质和保护酶在对抗大维链球菌铝毒性中的关键作用,在酸性环境中加剧生长抑制的关键因素。这些发现为在具有挑战性的土壤条件下对大维的实际农业利用提供了初步的理论见解。
Sophora davidii, a vital forage species, predominantly thrives in the subtropical karst mountains of Southwest China. Its resilience to poor soil conditions and arid environments renders it an ideal pioneer species for ecological restoration in these regions. This study investigates the influence of acidic, aluminum-rich local soil on the germination and seedling growth physiology of S. davidii. Experiments were conducted under varying degrees of acidity and aluminum stress, employing three pH levels (3.5 to 5.5) and four aluminum concentrations (0.5 to 2.0 mmol·L-1). The results showed that germination rate, germination index, and vigor index of S. davidii seeds were decreased but not significantly under slightly acidic conditions (pH 4.5-5.5), while strong acid (pH = 3.5) significantly inhibited the germination rate, germination index, and vigor index of white spurge seeds compared with the control group. Aluminum stress (≥0.5 mmol·L-1) significantly inhibited the germination rate, germination index, and vigor index of S. davidii seed. Moreover, the seedlings\' root systems were sensitive to the changes of aluminum concentration, evident from significant root growth inhibition, characterized by root shortening and color deepening. Notably, under aluminum stress (pH = 4.3), the levels of malondialdehyde and proline in S. davidii escalated with increasing aluminum concentration, while antioxidant enzyme activities demonstrated an initial increase followed by a decline. The study underscores the pivotal role of cellular osmoregulatory substances and protective enzymes in combating aluminum toxicity in S. davidii, a key factor exacerbating growth inhibition in acidic environments. These findings offer preliminary theoretical insights for the practical agricultural utilization of S. davidii in challenging soil conditions.