Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1007/s00374-026-02026-3 |
| Volltext | Shareable Link |
| Titel (primär) | Drought stress stimulates phenolic acids exudation and suppresses rhizosphere bacterial taxa to reduce lignin content in turfgrass rhizosphere soil |
| Autor | Liu, X.; Wang, S.; Zhang, H.; Wen, H.; Yue, Y.; Fan, X. |
| Quelle | Biology and Fertility of Soils |
| Erscheinungsjahr | 2026 |
| Department | AECOL |
| Sprache | englisch |
| Topic | T5 Future Landscapes |
| Supplements | Supplement 1 Supplement 2 |
| Keywords | Drought; Root exudate; Turfgrass; Rhizosphere soil bacteria; Lignin |
| Abstract | Drought
severely constrains plant growth and impairs soil microbial activity,
and urban lawns act as a vital reservoir of soil organic carbon (SOC).
Nevertheless, how drought regulates rhizosphere bacteria to mediate SOC
fractions in turfgrasses remains poorly understood. We established a
microcosm experiment and found that the contents of lignin and amino
sugars in rhizosphere soil of Carex leucochlora (a native species of China) and Poa pratensis
(an introduced species) decreased significantly with declining soil
water-holding capacity (WHC). At 30% WHC, rhizosphere soil amino sugar
concentrations were markedly higher in Carex than in Poa.
Lower WHC significantly increased the concentrations of organic acids
and phenolic acids in both turfgrass species, whereas carbohydrates and
amino acids only increased in Carex. Drought suppressed soil enzyme activities, yet β-glucosidase and xylanase activities in Carex rhizosphere soil were higher than those in Poa.
Turfgrass genotype predominantly shaped the response of bacterial
communities to drought, with the tricarboxylic acid cycle genes MUT and por exhibiting divergent abundance patterns between the two species. Phenolic acid-responsive Sphingomonas and Bradyrhizobium
served as core regulators in affecting the dynamics of lignin and
keystone modules in the bacterial co-occurrence network. Structural
equation modeling indicated that drought-induced accumulation of
phenolic acids suppressed the abundance of these key bacterial taxa and
soil enzyme activities, thereby reducing lignin and SOC contents.
Overall, drought potentially reduces SOC fractions in turfgrass
rhizosphere by promoting phenolic acid exudation and inhibiting critical
bacteria activities. |
| Liu, X., Wang, S., Zhang, H., Wen, H., Yue, Y., Fan, X. (2026): Drought stress stimulates phenolic acids exudation and suppresses rhizosphere bacterial taxa to reduce lignin content in turfgrass rhizosphere soil Biol. Fert. Soils 10.1007/s00374-026-02026-3 |
|