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|Title: ||Influence of proportion sand in soil on the effect of soil water potential on foraging pattern of Resinicium bicolor|
|Authors: ||Abd Jamil Z.|
|Issue Date: ||2004|
|Publisher: ||Malaysian Society of Plant Physiology|
|Citation: ||Advances in plant science: Proceedings of the 15th Malaysian Society of Plant Physiology conference: Port Dickson, Negeri Sembilan (Malaysia), 14-16 Sep, 2004, p. 132-140|
|Series: ||Transactions of the Malaysian Society of Plant Physiology|
|Abstract: ||The effect of soil water potential and composition of sand on foraging morphology of Resinicium bicolor was studied in laboratory microcosm for 7 weeks. The microcosm consisted of compacted soil in 24x24 cm tray and using Scots pine (Pinus sylvestris) wood blocks of size 2x2x0.5 cm as inoculum. Six soil water potentials of -0.0013, -0.0025, -0.005, -0.01 and -0.02 MPa were factorially combined with soils to which sand was added at 0%, 20%, 40%, 60% and 80% (oven dry weight basis).The water potential had remarkable effects on the foraging attributes of R. bicolor namely; mycelial extension, mycelial area cover and fractal dimension with the cardinal water potential around -0.005 to -0.01MPa. At the highest water potential (-0.0013 Mpa) reduced all the attributes studied were reduced but the lowest water potential (-0.02 MPa) generally reduced mycelial extension rate and mycelial area cover rate but not fractal dimension. The presence of added sand markedly influenced the effect of water potential on the foraging pattern of R. bicolor. At high water potential levels of -0.0013 to -0.005 MPa the added sand reduced the negative effect of water potential making the foraging morphology appearing similar to those at slightly lower water potential. However, at low water potential levels of -0.01 to -0.02MPa the addition of high percentages of sand had hasten the reducing effect of water potential on these variables. Mycelial cords that develop at high water potentials of -0.0013 or -0.0025 MPa and with less than 40% sand added, develop were compact, well aggregated, sparsely distributed and mostly solitary. Branches, if produced were at the later stages and grew at small angle. At the lowest water potential of -0.01 or -0.02 MPa with 60 - 80% added sand, cord branching started much earlier (15 d) growing at both big and small angles but composed of loosely aggregated cord and, produced 'woolly' appearance due to presence of small short lateral non-elongating hypha.|
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