1991
DOI: 10.1104/pp.97.2.821
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Mycorrhizal Fungi and Nonhydraulic Root Signals of Soil Drying

Abstract: We propose that mycorrhizal colonization of roots alters nonhydraulic root to shoot communication of soil drying. Split-root rose (Rosa hybrida L. cv Samantha) plants-one side of the root system colonized by Glomus intraradices Schenck & Smith, the other side nonmycorrhizal-displayed different stomatal conductances upon partial drying, depending upon whether mycorrhizal or nonmycorrhizal roots were dried. No differences in leaf water status were observed among control plants and those whose mycorrhizal or nonm… Show more

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Cited by 52 publications
(22 citation statements)
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“…It has been argued that as soil TT declines below leaf T, signals from drying roots cannot be transported to shoots via the transpiration stream since the water potential gradient is unfavourable for water uptake (Jones, 1990). Differences in soil drying rate were also probably involved in different C\ responses in mycorrhiza] and non-mycorrhizal rose leaves to partial soil drying (Auge & Duan, 1991 …”
Section: Myeorrhizal Symbiosis and Non-hydraulic Signallingmentioning
confidence: 99%
“…It has been argued that as soil TT declines below leaf T, signals from drying roots cannot be transported to shoots via the transpiration stream since the water potential gradient is unfavourable for water uptake (Jones, 1990). Differences in soil drying rate were also probably involved in different C\ responses in mycorrhiza] and non-mycorrhizal rose leaves to partial soil drying (Auge & Duan, 1991 …”
Section: Myeorrhizal Symbiosis and Non-hydraulic Signallingmentioning
confidence: 99%
“…Such studies suggest that stomatal closure resulting from soil water depletion is mediated by changes in root water status through effects on the chemical flow of information from root to shoot. The existence of ' nonhydraulic ' root signals has been demonstrated or suggested in several woody species, including Acer pseudoplatanus (Khalil & Grace, 1993), Prunus aviumipseudocerasus , Malusidomestica (Gowing et al, 1990), Prunus dulcis (Fußeder et al, 1992), Rosa hybrida (Auge! & Duan, 1991), some coniferous species (Jackson et al, 1995) andC.…”
Section: mentioning
confidence: 99%
“…Mycorrhizal fungi can also increase the hydraulic conductance of infected roots, enhancing water uptake under drought conditions (Cui & Nobel, 1992). There is also evidence to suggest that mycorrhizal fungi might alter nonhydraulic signals produced by roots in drying soil that affect stomata and leaf expansion (Auge & Duan, 1991;Auge et al, 1994). Greater acquisition of not only P (Marschner & Dell, 1994) but also N (George et al, 1992;Tobar, Azcon & Barea, 1994a, b) by mycorrhizal roots might also become increasingly more important as soil water is depleted and nutrient diffusion rates are drastically lowered.…”
Section: Introductionmentioning
confidence: 99%