Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources, Ministry of Natural Resources, Hefei 230036, China.
J Agric Food Chem. 2022 Sep 7;70(35):10738-10746. doi: 10.1021/acs.jafc.2c03063. Epub 2022 Aug 26.
To explore the mechanisms of crop straw degradation and phosphorus (P) release by phosphate-solubilizing fungi (PSF), a typical PSF (, ANG) was investigated for the degradation of wheat straw (WST) in this work. The results revealed that significantly increased wheat straw degradation (30%) compared with no treatment (7.7%). Meanwhile, more than 92% of total P was released from WST by , much higher than from WST treatment (69.5%). Although the ratios of inorganic P release between WST and WST + ANG treatments were similar (17.6 vs 19.7%), a significant difference occurred between their release of organic P, i.e., WST (51.9%) vs WST + ANG (72.5%). The high enzyme activity of β-1,4-glucanase and β-glucosidase produced by contributed to the wheat straw degradation and organic P release compared with no treatment. Oxalic acid secreted by dominated the release of inorganic P from WST. Our findings suggested that is an efficient microbial agent for crop straw degradation and P release, which could be a candidate in the pathway of straw return.
为了探索解磷真菌（PSF）促进作物秸秆降解和磷（P）释放的机制，本研究选用一种典型的 PSF（解淀粉芽孢杆菌，ANG）来研究其对小麦秸秆（WST）的降解作用。结果表明，与无 ANG 处理（7.7%）相比，ANG 处理显著提高了小麦秸秆的降解率（30%）。同时，ANG 处理从 WST 中释放的总 P 量超过 92%，远高于 WST 处理（69.5%）。尽管 WST 和 WST+ANG 处理之间的无机 P 释放比例相似（17.6%比 19.7%），但它们有机 P 的释放存在显著差异，即 WST（51.9%）比 WST+ANG（72.5%）。ANG 产生的β-1,4-葡聚糖酶和β-葡萄糖苷酶的高酶活性有助于小麦秸秆的降解和有机 P 的释放，与无 ANG 处理相比。ANG 分泌的草酸主导了 WST 中无机 P 的释放。我们的研究结果表明，ANG 是一种促进作物秸秆降解和 P 释放的有效微生物菌剂，可能是秸秆还田途径中的候选菌。
