Whether nutrients increased or decreased in host tissues were
contingent on soil nutrient levels. Though Allium was more responsive
overall, AM fungi reduced nutrients in Allium under low
fertilizer, but increased shoot nutrients when soil nutrients were
abundant. It may be that at low nutrient levels there is competition
between fungus and plant for limiting nutrients. Such competition
between roots and fungi has been suggested as a mechanism to
explain nitrogen budgets in AM plants (Hodge et al., 2010) and carbon
sequestration in the common mycelial network (Robinson and
Fitter, 1999). However, evidence on the pervasiveness or the effect
size of such competition is almost entirely lacking, and deserves
further study.
Whether nutrients increased or decreased in host tissues werecontingent on soil nutrient levels. Though Allium was more responsiveoverall, AM fungi reduced nutrients in Allium under lowfertilizer, but increased shoot nutrients when soil nutrients wereabundant. It may be that at low nutrient levels there is competitionbetween fungus and plant for limiting nutrients. Such competitionbetween roots and fungi has been suggested as a mechanism toexplain nitrogen budgets in AM plants (Hodge et al., 2010) and carbonsequestration in the common mycelial network (Robinson andFitter, 1999). However, evidence on the pervasiveness or the effectsize of such competition is almost entirely lacking, and deservesfurther study.
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