干旱消除了两种半干旱草原物种与根系对比的根特征可塑性和菌根反应的差异
Dongdong Duan1,2, Xiaoxuan Feng1, Nana Wu1
1State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China.
International journal of molecular sciences
|June 28, 2023
概括
植物根系和树状菌根菌 (AM) 影响资源获取. 干旱影响根特征和AM真菌,根和纤维根植物都受益于在水资源稀缺的情况下的AM真菌.
科学领域:
- 植物生态学植物生态学
- 土壤科学 土壤科学
- 菌类学 菌类学是指菌类学.
背景情况:
- 根特征和树状菌根 (AM) 菌对于植物获得土壤资源至关重要.
- 根特征的可塑性差异和干旱下对AM真菌的响应能力,基于根系类型 (塔根与纤维根),仍未得到充分研究.
研究的目的:
- 研究根植物 (Lespedeza davurica) 和纤维根植物 (Stipa bungeana) 在干旱下如何调整根特征和菌根协会.
- 为了比较AM真菌在不同根类型的资源采集中的作用,在不同的水供应条件下.
主要方法:
- 植物在单一栽培中生长,在绝育和活的土壤中生长,受干旱条件的影响.
- 评估生物量,根特征 (例如,根:发芽比,特定根长度),AM真菌殖民,以及土壤营养物质的可用性 (NO3--N,可用P).
主要成果:
- 干旱减少了生物质和根径,但增加了根:芽的比率,特定的根长度,以及两种物种的土壤营养的可用性.
- 土壤灭菌对根特征和营养素的影响因物种和水条件而异.
- 绝育减少了AM真菌的殖民性,但在活土壤中干旱增加了.
- 在干旱期间,AM真菌对这两种植物类型都至关重要,而不是在水条件下,L. davurica表现出更大的依赖.
结论:
- 根系架构影响植物对干旱和土壤微生物群落的反应.
- 在干旱期间,树枝状菌根真菌在提高水龙头根植和纤维根植植物的资源获取方面发挥着关键的,同样重要的作用.
- 研究结果提供了关于植物在气候变化中利用资源的策略的见解.
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