ArticleBMC plant biology2026
Rhizosheath is the key structural element for enhancing the drought resistance in alpine desertified grasslands of Kengyilia hirsuta.
Article in BMC plant biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
BACKGROUND AND
aimsTo cope with extreme drought of sandy grassland ecosystems, sand-adapted plants of Kengyilia hirsuta have evolved specialized functional traits for rhizosheath. The majority of studies ignore the natural process of drought-rewatering simulation and lack systematic research on regulatory mechanisms during rhizosheath formation, restricting understanding of the optimal adaptation strategy for sand-adapted plants.
methodsThe research was set up with three drought-rewatering cycles and three sustained drought levels. Rhizosheath weight, root morphology, targeted metabolites, and microbial community structure were measured and analyzed, and the relationships among these variables were examined using multivariate statistics.
resultsUnder continuous drought conditions, maintaining soil moisture at 25% of field capacity (W5) synergistically increased root volume, root tip number, and root hair length, and these changes were significantly positively correlated with the increase in rhizosheath weight. This treatment was also accompanied by the accumulation of stearic acid (C18:0) and the specific enrichment of key microbial taxa, including Myxococcota and Ascomycota, which collectively exhibited a synergistic "morphology-metabolite-microbe" homeostatic optimization association. Under the drought-rewatering cycle regime, rewatering to 25%-40% of field capacity (W2, W3) significantly induced the accumulation of palmitic acid (C16:0) and palmitoleic acid (C16:1N7), and these changes were closely associated with the rapid reassembly of the bacterial community. Proteobacteria were positively correlated with root expansion, Ascomycota were associated with rhizosheath development, and the key fatty acids showed consistency with the directional succession of the microbial community.
conclusionThis study reveals that K. hirsuta adapts to continuous drought and drying-rewetting cycles through two mechanisms: "steady-state resistance" and "plastic adjustments", which collectively constitute a regulatory network for plant water adaptation, providing a theoretical basis for screening stress‑tolerant forage germplasm and research on drought tolerance mechanisms of forage.
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