Roots and Nodules Response Differently to P Starvation in the Mediterranean-Type Legume Virgilia divaricata

Frontiers in Plant Science
Gary G StevensAlex J Valentine

Abstract

Virgilia divaricata is a tree legume that grows in the Cape Floristic Region (CFA) in poor nutrient soils. A comparison between high and low phosphate growth conditions between roots and nodules was conducted and evaluated for the plants ability to cope under low phosphate stress conditions in V. divaricata. We proved that the plant copes with low phosphate stress through an increased allocation of resources, reliance on BNF and enhanced enzyme activity, especially PEPC. Nodules had a lower percentage decline in P compared to roots to uphold its metabolic functions. These strategies partly explain how V. divaricata can sustain growth despite LP conditions. Although the number of nodules declined with LP, their biomass remained unchanged in spite of a plant decline in dry weight. This is achieved via the high efficiency of BNF under P stress. During LP, nodules had a lower % decline at 34% compared to the roots at 88%. We attribute this behavior to P conservation strategies in LP nodules that imply an increase in a metabolic bypass that operates at the PEP branch point in glycolysis. The enhanced activities of nodule PEPC, MDH, and ME, whilst PK declines, suggests that under LP conditions an adenylate bypass was in operation eit...Continue Reading

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Citations

Sep 7, 2019·Plants·Andrés R SchwemberRicardo A Cabeza
Sep 11, 2019·Plants·María Pérez-FernándezAlexandre Valentine

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Methods Mentioned

BETA
NMR

Software Mentioned

KaleidaGraph
VnmrJ

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