盐碱胁迫下不同木霉菌肥对大豆幼苗氮代谢的影响
- Title:
- Effects of Different Trichoderma Fertilizers on Nitrogen Metabolism of Soybean Seedlings under Saline-alkali Stress
- 摘要:
- 盐碱胁迫对大豆植株生长发育以及氮素吸收等造成不利影响,进而严重影响大豆的产量,而外源施用木霉菌肥是缓解盐碱对大豆胁迫效应的一种有效途径。因此为明确木霉菌对盐碱胁迫下大豆幼苗氮代谢影响机制,本研究选用耐盐碱品种合丰50(HF50),盐碱敏感品种垦丰16(KF16)为试材,采用苏打盐碱土进行盆栽培养,按照每升土1×109孢子·L-1浇入200 mL哈茨木霉、棘孢木霉及木霉菌混合菌液,测定大豆幼苗叶绿体ATP合成及氮代谢等生理生化指标。结果显示:盐碱胁迫显著增加大豆幼苗体内NH4+含量,导致氨毒害,而施用不同木霉菌肥后显著降低了KF16和HF50大豆叶片NH4+含量,降幅分别为38.31%、41.56%、63.62%(KF16)和20.55%、25.58%、55.62%(HF50)。施用木霉菌剂后大豆叶片Ca2+ATP和Mg2+ATP酶活性较对照处理显著提高36.15%~65.22%(KF16)、28.51%~62.47%(HF50)和23.09%~62.58%(KF16)、14.37%~44.10%(HF50),进而促进叶片光合速率,为大豆幼苗氮代谢提供了更多原料和能量,从而提高了大豆氮代谢活性。结果说明不同木霉菌处理能够有效缓解盐碱胁迫对大豆造成的损害,从而促进大豆生长。
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