Greater Leaf Conductance of Well‐watered Va Mycorrhizal Rose Plants Is Not Related to Phosphorus Nutrition*

Augé, Robert M.; Schekel, Kurt A.; Wample, Robert L.

doi:10.1111/j.1469-8137.1986.tb00600.x

Cited by 89 publications

(47 citation statements)

References 34 publications

(38 reference statements)

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“…For example, leaf water potential was about 0.2 MPa lower in mycorrhizal wheat plants than in similar-sized nonmycorrhizal plants when the stomata began to close (Allen & Boosalis, 1983). Similarly, leaf water potential at stomatal closure was 0.7 MPa lower in AMF rose plants than in non-mycorrhizal plants of the same size (Auge et al, 1986).…”

Section: Leaf Water Potentialmentioning

confidence: 95%

Effects of arbuscular mycorrhizal fungi and Bradyrhizobium japonicum on drought stress of soybean

2006

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Mycorrhizal symbiosis can potentially improve water uptake by plants. In a controlled pot culture experiment, soybean plants were inoculated with two species of arbuscular mycorrhizal fungi, Glomus mosseae (Gm) or Glomus etunicatum (Ge), or left non-inoculated (NM) as control in a sterile soil. Four levels of soil moisture (Field capacity, 0.85 FC, 0.7 FC, 0.6 FC) in the presence or absence of the Bradyrhizobium japonicum, were applied to the pots. Relative water content (RWC) of leaf at both plant growth stages (flowering and seed maturation) decreased with the dryness of soil; RWC was higher in all mycorrhizal than non-mycorrhizal plants irrespective of soil moisture level. At the lowest moisture level (0.6 FC) Ge was more efficient than Gm in maintaining high leaf RWC. Leaf water potential (LWP) had the same trend as RWC in flowering stage but it was not significantly influenced by decrease in soil moisture to 0.7 FC during seed maturation stage. Seed and shoot dry weights were affected negatively by drought stress. Mycorrhizal plants, however had significantly higher seed and shoot dry weights than non-mycorrhizal plants at all moisture levels except for seed weight at 0.6 FC. Root mycorrhizal colonization was positively correlated with RWC, LWP, shoot N and K, and seed weight, implying improvement of plant water and nutritional status as a result of colonization. Regardless of moisture treatments, bacterial inoculation caused a significant enhancement in N content and the highest N occurred in rhizobial inoculated plants at 0.85 FC and 0.7 FC. Shoot K was enhanced considerably by both bacterial and fungal inoculations, particularly in plants with dual inoculations where the highest shoot K levels were found. The relatively higher shoot and seed dry weights in plants inoculated with both G. etunicatum and B. japonicum could be ascribed to their higher RWC and LWP, suggesting that drought avoidance is main mechanism of this plant-microbe association in alleviation of water stress in soybean.

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Section: Leaf Water Potentialmentioning

confidence: 95%

Effects of arbuscular mycorrhizal fungi and Bradyrhizobium japonicum on drought stress of soybean

2006

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“…Increases in tissue P concentrations have been shown to account for a large amount of the VA mycorrhizal effect measured in Lp (Graham & Syvertsen, 1984) or whole plant water relations (Nelsen & Safir, 1982;Koide, 1985;Fitter, 1988), with some exceptions (Auge, Schekel & Wample, 1986).…”

Section: Phosphorus Nutrition and Lpmentioning

confidence: 99%

Root hydraulic conductivity and xylem sap levels of zeatin riboside and abscisic acid in ectomycorrhizal Douglas fir seedlings

1990

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SUMMARYMechanistic hypotheses to explain mycorrhizal enhancement of root hydraulic conductivity (Lp) suggest that phosphorus (P) nutrition, plant growth substances and/or altered morphology may be responsible. Such ideas are based on work with VA (vesicular-arbuscular) mycorrhizas. Since VA mycorrhizas and ectomycorrhizas differ m many respects, they may alter host plant water uptake via different mechanisms. This paper examines Lj, in various ectomycorrhizal associations while considering factors which are important to the VA mycorrhizal effect on Lp. Douglas fir Pseudotsuga menziesii (Mirb.) Franco] seedlings inoculated with the ectomycorrhizal fungi Laccaria bicolor (Maire) Orton and Hebeloma crustuliniforme (Bull, ex St. Amans) Quel. and non-inoculated seedlings infected naturally with Thelephora were grown under three low levels of P fertilization (1, 10 and 100/^M P). Seedling morphology, tissue P levels, Lp and plant growth substance levels in xylem sap were measured after nine months growth. Increased tissue P and decreased root/shoot ratio correlated with increased L^, in each of the mycorrhizal treatments. When adjusted for the effect of these two factors, Lp of Laccaria and Hebeloma seedlmgs was still lower than the Thelephora seedlings. In a subsequent experiment, the Lp of seedlings with Hebeloma and Rhizopogon vinicolor Smith mycorrhizas was compared to the Lp of non-mycorrhizal seedlings (grown at 100 mM P) and no differences were found among treatments. The lack of an ectomycorrhizal effect on Lp is quite different from the enhancement of host Lp by VA mycorrhizas. Zeatin riboside concentrations of Thelephora-and Hebeloma-infected seedlings were similar, yet higher than with Laccarta. There was no relationship between plant growth substances and Lp in ectomycorrhizal Douglas fir, despite lower zeatin riboside concentrations for Laccar/a-inoculated plants.

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“…Auge! et al (1995) reported that applied P had no effect on stomata in half-dried sorghum plants, but in other studies they reported a decrease in stomatal conductance in roses (Auge! et al, 1986), and in maize under dry conditions (Auge!…”

Section: mentioning

confidence: 99%

Phosphorus concentrations in the leaves of defoliated white clover affect abscisic acid formation and transpiration in drying soil

et al. 2000

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Increased leaf phosphorus (P) concentration improved the water-use efficiency (WUE) and drought tolerance of regularly defoliated white clover plants by decreasing the rate of daily transpiration per unit leaf area in dry soil. Night transpiration was around 17% of the total daily transpiration. The improved control of transpiration in the high-P plants was associated with an increased individual leaf area and WUE that apparently resulted from net photosynthetic assimilation rate being reduced less than the reductions in the transpiration (27% vs 58%). On the other hand, greater transpiration from low-P plants was associated with poor stomatal control of transpirational loss of water, less ABA in the leaves when exposed to dry soil, and thicker and smaller leaf size compared with high-P leaves. The leaf P concentration was positively related with leaf ABA, and negatively with transpiration rates, under dry conditions (P 0n001). However, leaf ABA was not closely related to the transpiration rate, suggesting that leaf P concentration has a greater influence than ABA on the transpiration rates.

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Greater Leaf Conductance of Well‐watered Va Mycorrhizal Rose Plants Is Not Related to Phosphorus Nutrition*

Cited by 89 publications

References 34 publications

Effects of arbuscular mycorrhizal fungi and Bradyrhizobium japonicum on drought stress of soybean

Effects of arbuscular mycorrhizal fungi and Bradyrhizobium japonicum on drought stress of soybean

Root hydraulic conductivity and xylem sap levels of zeatin riboside and abscisic acid in ectomycorrhizal Douglas fir seedlings

Phosphorus concentrations in the leaves of defoliated white clover affect abscisic acid formation and transpiration in drying soil

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