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The primary consequence of Al exposure is severe inhibition of growth of the primary root
The lack of nitric oxide production in Al treated roots also causes the production of jasmonic acid, a hormone-like molecule in plants known to regulate environmental stresses such as ozone, heavy metals and pathogen attack . Determination of Al-induced toxicity is further complicated by interference with mineral absorption at the root apex, resulting in deficiency…
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The beneficial effects of soil aggregation for plant growth have long been established
The effect of differential oxygen inhibition in the exterior of aggregates is however secondary to the effect of diffusive mass transfer limitation in creating the observed gradients in reduced selenium. This is evidenced by the similarity in reduced selenium gradients observed under anoxic and oxic conditions. Another effect of oxygen is that by enabling aerobic…