| Autor: |
DONNINI, SILVIA, DE NISI, PATRIZIA, GABOTTI, DAMIANO, TATO, LILIANA, ZOCCHI, GRAZIANO |
| Předmět: |
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| Zdroj: |
Plant, Cell & Environment; Jun2012, Vol. 35 Issue 6, p1171-1184, 14p |
| Abstrakt: |
ABSTRACT The study of native plants growing in hostile environments is useful to understand how these species respond to stress conditions. Parietaria diffusa (M.&K.) is able to survive in highly calcareous soils and extreme environments, such as house walls, without displaying any chlorotic symptoms. Here, we have investigated the existence of Strategy I complementary/alternative mechanism(s) involved in Fe solubilization and uptake and responsible for Parietaria's extraordinary efficiency. After assessing the specific traits involved in a calcicole-behaviour in the field, we have grown plants in conditions of Fe deficiency, either direct (−Fe) or induced by the presence of bicarbonate (+FeBic). Then, the growth performance, physiological and biochemical responses of the plants were investigated. The study shows that in Parietaria+FeBic, the classical responses of Strategy I plants are activated to a lower extent than in −Fe. In addition, there is a greater production of phenolics and organic acids that are both exuded and accumulated in the roots, which in turn show structures similar to 'proteoid-like roots'. We suggest that in the presence of this constraint, Parietaria undergoes some metabolic rearrangements that involve PEP-consuming reactions and an enhancement of the shikimate pathway. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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