EFFECT OF VESICULAR‐ARBUSCULAR MYCORRHIZA ON <i>CITRUS JAMBHIRI</i> WATER RELATIONS

Levy, Y.; Krikun, J.

doi:10.1111/j.1469-8137.1980.tb04444.x

Cited by 129 publications

(63 citation statements)

References 17 publications

(16 reference statements)

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“…Equal uncertainty appears to exist in the literature regarding the effects of VAM and ectomycorrhizae on the host leaf water status, stomatal conductance and drought recovery [2][3][4][5]21]. The disagreement among studies regarding effects of mycorrhizae on the host root hydraulic conductance has been suggested to be due to changes in the root cortex anatomy caused by VAM but not by ectomycorrhizae [40] rather than to differences in the hydraulic conductance of the extraradical hyphae [6].…”

Section: Introductionmentioning

confidence: 95%

Influence of the ectomycorrhizas formed by Tuber melanosporum Vitt. on hydraulic conductance and water relations of Quercus ilex L. seedlings

et al. 2000

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-The physiological impact of ectomycorrhizal infection was investigated in the association between Tuber melanosporumVitt. and Quercus ilex L. A number of physiological parameters were investigated on 2-year-old seedlings inoculated for 22 months (I-seedlings) compared to non-inoculated plants (NI-seedlings). I-seedlings had a 100% infection rate in root tips compared to a 25% infection rate in root tips of NI-seedlings. I-seedlings had higher values of net assimilation and stomatal conductance than NIseedlings. Root hydraulic conductance per unit root surface area of I-seedlings was much reduced to 0.44× that of NI-seedlings but had 2.5× more fine root surface area than NI-seedlings. When root conductance was scaled by leaf area, the I-seedlings had 1.27× the root conductance per unit leaf area compared to NI-seedlings. I-seedlings also had significantly higher hydraulic conductances of shoots with leaves, of shoots without leaves and lower leaf blade hydraulic resistances.hydraulic conductance / water relations / ectomycorrhiza / Quercus ilex L. / HPFM Résumé -Influence sur la conductance hydraulique et les relations hydriques des semis de Quercus ilex L. des ectomycorrhizes formées par Tuber melanosporum Vitt. L'impact physiologique dû à l'infection d'ectomycorrhizes a été étudié dans l'association Tuber melanosporum Vitt. et Quercus ilex L. Un certain nombre de paramètres physiologiques ont été mesurés sur des semis de 2 ans inoculés pendant 22 mois (semis-i) en comparaison avec des cultures saines (semis-ni). Les semis-i présentent 100 % de taux d'infection des racines, tandis que les semis-ni atteignent un taux de 25 %. Les semis-i ont des niveaux d'assimilation nette plus élevés par rapport aux semis-ni. La conductance hydraulique des racines par unité de surface des racines pour les semis-i est réduite de plus de 0,44 fois par rapport aux semis-ni, mais comporte une surface de racines 2,5 fois inférieure à celle des semis-ni. En rapportant la conductance des racines à la surface des feuilles, la conductance des racines par unité de surface des feuilles des semis-i est 1,27 fois plus élevée que celle des semis-ni. Les semis-i présentent également une conductance hydraulique des rameaux avec feuilles et sans feuilles bien plus élevée, ainsi qu'une moindre résistance hydraulique des feuilles.conductance hydraulique / relations hydriques / ectomycorrhize / Quercus ilex L. / HPFM Abbreviations PAR: photosyntetically active radiation Ψ L : leaf water potential g L : leaf conductance to water vapor Pn: net photosynthesis A L : total leaf surface area A R : total root surface area Ann. For. Sci. 57 (2000) [305][306][307][308][309][310][311][312] 305

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Section: Introductionmentioning

confidence: 95%

Influence of the ectomycorrhizas formed by Tuber melanosporum Vitt. on hydraulic conductance and water relations of Quercus ilex L. seedlings

et al. 2000

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“…Essas associações melhoram a capacidade de absorção e utilização dos nutrientes (Bougher et al, 1990;Thomson et al, 1994), de absorção de água (Levy & Krikun, 1980), de tolerân-cia a condições desfavoráveis do solo (Wilkins, 1991) e de resistência a microrganismos patogênicos ou deletérios (Marx, 1969;Kope & Fortin, 1989;Newsham et al, 1995).…”

Section: Introductionunclassified

Efeito de inoculante ectomicorrízico produzido por fermentação semi-sólida sobre o crescimento de Eucalyptus dunnii Maiden

Alves

Souza

Podlech

et al. 2001

Pesq. agropec. bras.

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Resumo -O crescimento de Eucalyptus é favorecido por fungos ectomicorrízicos (FECM).De ocorrência comum nas plantações florestais, os FECM diferem, entretanto, em infectividade e eficiência. O objetivo deste estudo foi testar a compatibilidade e a eficiência do inoculante ectomicorrízico produzido por fermentação semi-sólida, em relação a Eucalyptus dunnii Maiden. Neste sentido, o inoculante de Pisolithus sp., produzido por fermentação semi-sólida em vermiculita-solução nutritiva, foi aplicado ao substrato turfa-vermiculita (30:70, v/v) nas concentrações de 0, 1, 3, 5 e 10% (v/v) que foi semeado com E. dunnii, e mantido em casa de vegetação. A inoculação proporcionou colonização radicular e aumento da matéria seca da parte aérea e do conteúdo de P em razão da concentração do inoculante. O peso da matéria seca das plantas com 1% de inoculante não diferiu do peso das testemunhas. A 3% e 5%, a matéria seca aumentou 62%. O maior valor foi obtido com 10% de inoculante, onde o peso das plantas foi 73% superior ao das testemunhas, e o teor de P, 130%. Resultados semelhantes foram obtidos em relação à raiz. Altura e diâmetro foram positivamente afetados pela inoculação, mas não a relação raiz/parte aérea. As doses mais eficientes de inoculante foram aquelas de 3% ou superiores. Este método de produção deverá ser testado com outros FECM, e sua eficiência, avaliada em viveiro e no campo.Termos para indexação: Pisolithus, inoculação, eficácia, fósforo, absorção. Effect of ectomycorrhizal inoculum produced by solid state fermentation on growth of Eucalyptus dunnii MaidenAbstract -Growth of Eucalyptus can be improved by ectomycorrhizal fungi (ECMF). Although widespread in forest plantations, ECMF differ in infectivity and effectiveness, hence the need of selection of compatible and efficient ECMF and the establishment of inoculum production methods. The objective of this study was to test compatibility and efficiency of the ectomycorrizal inoculum produced by solid state fermentation, in relation to Eucalyptus dunnii Maiden. For this purpose, inoculum of Pisolithus sp. was produced by solid state fermentation in vermiculite + nutrient solution and applied to peat:vermiculite (30:70 v/v) at 0, 1, 3, 5 and 10% (v/v). Seeds of E. dunnii were sown and kept in a glasshouse. Inoculation promoted root colonization, plant growth and phosphorus (P) uptake depending upon inoculum concentration. Plant dry matter with 1% inoculum did not differ from that of the controls. At 3% and 5%, plants had 60% more dry matter than the controls. At 10%, inoculum shoot dry weight (dw) was 70% higher, and P content was 130% higher than that of the controls. Similar results were obtained in relation to root dw. Height and diameter were also positively affected by inoculation. Root:shoot ratios were not influenced. The most efficient doses were those at 3% inoculum or higher. This method of inoculum production needs to be tested with other ECMF and its efficiency must be evaluated in the nursery and in the field.

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“…Altered morphology, specifically root/shoot ratio, is also considered to be responsible for the VA mycorrhizal effect on plant water flux (Andersen et al, 1988) and may also be related to enhanced P status. In addition, VA mycorrhizal effects on water flux have been attributed to an altered balance of plant growth substances (Levy & Krikun, 1980;Allen et aL, 1981). The latter hypothesis has, to our knowledge, not been rigorously tested by concurrent measurement of water flux and plant growth substance levels.…”

Section: Introductionmentioning

confidence: 99%

“…Plant-growth substances were measured to test the hypothesis that mycorrhizal fungi alter levels of such compounds which, in turn, alter water fiux through mycorrhizal plants (Levy & Krikun, 1980;Allen et al, 1981). We measured ABA and ZR because of their effect on plant water relations and their reported movement from root to shoot in the xylem sap (Mansfield, 1987).…”

Section: Plant-growth Substancesmentioning

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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EFFECT OF VESICULAR‐ARBUSCULAR MYCORRHIZA ON CITRUS JAMBHIRI WATER RELATIONS

Cited by 129 publications

References 17 publications

Influence of the ectomycorrhizas formed by Tuber melanosporum Vitt. on hydraulic conductance and water relations of Quercus ilex L. seedlings

Influence of the ectomycorrhizas formed by Tuber melanosporum Vitt. on hydraulic conductance and water relations of Quercus ilex L. seedlings

Efeito de inoculante ectomicorrízico produzido por fermentação semi-sólida sobre o crescimento de Eucalyptus dunnii Maiden

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

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