Adaptation of the C4 grass Panicum maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation patterns

Adaptation of the C4 grass Panicum maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation patterns

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Dry mass production and persistence of Panicum maximum pastures depends on nitrogen supply.Defoliation influences N uptake and allocation patterns Oviposition Deterrence and Larvicidal Activity of Propyl Ether Dillapiole and Piperidyl Dillapiole Against Aedes (Stegomyia) aegypti (Diptera: Culicidae) yet its effects on plasticity of N dynamics in P.maximum have not been investigated.Stable isotopes of N (15N) were used in order to test the hypothesis that defoliation in terms of proportion of the leaf area removed effects N mobilisation, uptake and allocation patterns in P.maximum.

The plants were initially cut weekly to a height of either 0.15 m or 0.30 m for seven weeks.Eight weeks after the first defoliation, all plants were defoliated for a final time to remove 0, 25, 50, 75 or 100 % of the area of each individual leaf blade of the main tiller.Root Reactions to Environmental Changes: Place Attachment Predicts Interest in Earth Observation Data N uptake was reduced when all leaf area was removed, but more lenient defoliation improved N uptake due to a positive effect on specific N uptake.

Young leaves, side tillers and roots were the main sinks for N from root uptake.Roots of P.maximum became a net source of N for mobilisation immediately after severe defoliation.Root uptake was the main source of N for new growth in P.maximum plants.

Allocation pattern of mobilised N was different from that of N derived from root uptake.It was concluded that adaptation of P.maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation, but changes in N dynamics did not offset negative impacts of complete defoliation of the plants.