Research on arbuscular mycorrhizal symbioses repeatedly reported that non-mycorrhizal plants and plants colonized by arbuscular mycorrhizal fungi (AMF) show distinct water consumption rates and physiological responses to certain moisture levels in the atmosphere and soil (Augé 2001, 2004; Augé et al. 2015; Bitterlich et al. 2019). The mechanisms responsible for changed water relations in the mycorrhizal scenario are, however, not as persuasively proven as those for nutrient delivery. While water molecules only accessible to AMF hyphae are found in higher quantities within mycorrhizal as compared to non-mycorrhizal plants (Püschel et al. 2020), the physiological relevance of direct hyphal water delivery has been judged equivocally (Allen 2007; Friese and Allen 1991; George et al. 1992; Püschel et al. 2020; Raven and Edwards 2001). However, a common finding is that plants engaged in arbuscular mycorrhizal symbioses deplete water from soils at higher rates and that physiological adjustments set in at different moisture levels than in plants that have not formed this symbiosis (Augé 2001; Augé et al. 2015). Technological advancements have allowed to prove that arbuscular mycorrhizal plants indeed differ from their non-mycorrhizal counterparts in their physiological and metabolic response to soil moisture, sometimes indicating a higher metabolic capacity to cope with water stress or to take up water (Aroca et al. 2007; Bárzana et al. 2014; Bitterlich et al. 2018c; Porcel et al. 2006; Porcel and Ruiz-Lozano 2004; Ruiz-Lozano et al. 1995; Zou et al. 2019).
Root growth and presence of Rhizophagus irregularis distinctly alter substrate hydraulic properties in a model system with Medicago truncatula
Richard Pauwels, Jan Jansa, David Püschel, Anja Müller, Jan Graefe, Steffen Kolb, Michael Bitterlich: Root growth and presence of Rhizophagus irregularis distinctly alter substrate hydraulic properties in a model system with Medicago truncatula.Plant and Soil ( IF 3.299 ) Pub Date : 2020-09-30