Response to flooding intensity in Elytrigia repens, E. intermedia (Poaceae: Triticeae) and their hybrid
| Autor: | V Mahelka |
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| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Weed Research. 46:82-90 |
| ISSN: | 1365-3180 0043-1737 |
| DOI: | 10.1111/j.1365-3180.2006.00490.x |
| Popis: | Summary Response to flooding intensity in three closely related taxa, Elytrigia repens, E. intermedia and their hybrid was studied. Plants were exposed to three intensities of flooding for a 30-day period. Response to flooding intensity was estimated by measuring dry mass of the following: total biomass, above-ground living biomass, above-ground dead biomass, below-ground biomass, rhizome and root mass and by the allocation of dry mass into rhizomes and root:shoot ratio. Reduction of nearly all the biomass compartments with increasing flooding intensity was observed in the three taxa. All three taxa can thus be regarded as flood-intolerant. Based on the parameters measured, E. repens is regarded as the relatively most flooding-tolerant, E. intermedia as the least tolerant, while the hybrid displayed intermediate flooding tolerance. The higher flooding tolerance in E. repens was likely related to its ability to accumulate a sufficient mass of rhizomes before flooding, due to higher regeneration ability. E. repens also displayed the highest phenotypic plasticity, as deduced from the reaction norms constructed for total biomass and rhizome mass of particular clones of the three taxa studied. This indicates that, on the species level, E. repens is better adapted to changing environmental conditions and it can be expected to colonize flooded soils. Both Elytrigia species also occur as weeds: E. intermedia grows in agricultural environments in warm regions, while E. repens infests many different types of habitats. Where they co-occur, hybridization between them may lead to the enrichment of their gene pools with genes responsible for survival of the parental species under extreme conditions; their weedy potential may thus be enhanced. |
| Databáze: | OpenAIRE |
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