Abstract
The succinate dehydrogenase (SDH) activity of hyphae of the vesicular-arbuscular (VA) mycorrhizal fungus Glomus mosseae (Nicol. & Gerd.) Gerdmann and Trappe, in symbiotic association with leek (Allium porrum L.) roots, was investigated by histochemical staining in situ. Leek seedlings were transplanted to sand culture and inoculated with spores of G. mosseae placed just below the base of the stem. At intervals (14, 25, 35 and 60 days) after transplanting, the growth medium of seedlings was flooded with nitro blue tetrazolium chloride solution, thereby displacing the nutrient solution. This allowed sites of SDH activity of external and internal fungal structures of the mycorrhizas to be stained without physically disturbing the symbiotic system. After counterstaining harvested roots and mycelium with acid fuchsin, it was possible to differentiate clearly metabolically active and inactive regions of the fungus. The lengths of external hyphae and infected root both increased nearly exponentially, and were in constant proportion (1.4 m hyphae per cm of infected root) for up to 60 days. The percentage length of external hyphae with SDH activity remained almost constant (80%). In each infected length of root there was a gradation of SDH activity from inactive distal (older) hyphae to uniformly active proximal (younger) hyphae. These findings are discussed in relation to the symbiotic activity of the mycobiont.
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Amijee F, Tinker PB, Stribley DP (1989) The development of endomycorrhizal root systems. VIL A detailed study of effects of soil phosphorus on colonization. New Phytol 111:435–446
Buwalda JG, Stribley DP, Tinker PB (1984) The development of endomycorrhizal root systems. V. The detailed pattern of development of infection and the control of infection level by host in young leek plants. New Phytol 96:411–427
Carr GR (1981) Interaction of soil micro-organisms in the rhizosphere of crop plants. PhD thesis, University of London
Cooper KM, Tinker PB (1981) Translocation and transfer of nutrients in vesicular-arbuscular mycorrhizas. IV. Effect of environmental variables on movement of phosphorus. New Phytol 88:327–339
Hamel C, Fyles H, Smith DL (1990) Measurement of development of endomycorrhizal mycelium using three different vital stains. New Phytol 115:297–302
Jasper DA, Abbott LK, Robson AD (1989) Soil disturbance reduces the infectivity of external hyphae of vesicular-arbuscular mycorrhizal fungi. New Phytol 112:93–99
Kough JL, Gianinazzi-Pearson V (1986) Physiological aspects of VA mycorrhizal hyphae in root tissue and soil. In: Gianinazzi-Pearson V, Gianinazzi S (eds) Physiological and genetical aspects of mycorrhizae. INRA, Paris, pp 223–225
Kough JL, Gianinazzi-Pearson V, Gianinazzi S (1987) Depressed metabolic activity of vesicular-arbuscular mycorrhizal fungi after fungicide applications. New Phytol 106:707–415
Macdonald RM, Lewis M (1978) The occurrence of some acid phosphatases and dehydrogenases in the vesicular-arbuscular mycorrhizal fungus Glomus mosseae. New Phytol 80:135–141
Newman EI (1966) A method for estimating the total length of root in a sample. J Appl Ecol 3:139–145
Ocampo JA, Barea JM (1985) Effect of carbamate herbicides on VA mycorrhizal infection and plant growth. Plant Soil 85:375–383
Pearson JN, Smith SE, Smith FA (1991) Effect of photon irradiance on the development and activity of VA mycorrhizal infection in Allium porrum. Mycol Res 95:741–746
Schubert A, Marzachi A, Mazzitelli M, Cravero MC, Bonfante-Fasolo P (1987) Development of total and viable extraradical mycelium in the vesicular-arbuscular fungus Glomus clarum Nicol. & Schenck. New Phytol 107:183–190
Smith SE, Gianinazzi-Pearson V (1990) Phosphate uptake and arbuscular activity in mycorrhizal Allium cepa L: effects of photon irradiance and phosphate nutrition. Aust J Plant Physiol 17:177–188
Smith SE, Walker NA (1981) A quantitative study of mycorrhizal infection in Trifolium: separate determination of the rates of infection and of mycelial growth. New Phytol 89:225–240
Söderström BE (1979) Some problems in assessing the fluorescein diacetate-active fungal biomass in the soil. Soil Biol Biochem 11:147–148
Sylvia DA (1988) Activity of external hyphae of vesicular-arbuscular mycorrhizal fungi. Soil Biol Biochem 20:39–43
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Saito, M., Stribley, D.P. & Hepper, C.M. Succinate dehydrogenase activity of external and internal hyphae of a vesicular-arbuscular mycorrhizal fungus, Glomus mosseae (Nicol. & Gerd.) Gerdmann and Trappe, during mycorrhizal colonization of roots of leek (Allium porrum L.), as revealed by in situ histochemical staining. Mycorrhiza 4, 59–62 (1993). https://doi.org/10.1007/BF00204059
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DOI: https://doi.org/10.1007/BF00204059