Abstract
In order to evaluate the effect of excess iron on the growth of sisal (Furcraea hexapetala) plants, an experiment was carried out in Tunja, Colombia, under greenhouse conditions. The plants were grown in a substrate in which 100, 150, 200 and 300 ppm of Fe were added. Control plants were provided without the addition of iron. The Chlorophyll Content Index, dry matter, and root to shoot ratio were gradually reduced as the Fe content in the substrate increased. Leaf area, relative growth rate, absolute growth rate, leaf area ratio and specific leaf area were significantly reduced with the higher doses of Fe. In addition, dry matter partitioning was altered in relation to the control plants and a lower allocation of dry matter in the roots of plants exposed to the higher Fe content was observed. Sisal plants are moderately tolerant to the excess Fe, however when exposed to 300 ppm of the metal, growth is drastically reduced.
Zusammenfassung
Um die Wirkung von überschüssigem Eisen auf das Wachstum von Sisal (Furcraea hexapetala) Pflanzen zu bewerten, wurde ein Experiment in Tunja, Kolumbien, unter Treibhausbedingungen durchgeführt. Die Pflanzen wurden in einem Substrat gezüchtet, in dem 100, 150, 200 und 300 ppm Fe zugegeben wurden, und es wurden Kontrollpflanzen ohne Zugabe von Eisen bereitgestellt. Als Ergebnis wurde festgestellt, dass der Chlorophyll-Inhaltsindex, die Trockenmasse und das Wurzel-zu-Punkt-Verhältnis allmählich verringert wurden, wenn der Fe-Gehalt in dem Substrat anstieg. Die Blattfläche, die relative Wachstumsrate, die absolute Wachstumsrate, das Blattflächenverhältnis und die spezifische Blattfläche wurden mit den höheren Dosen von Fe am deutlichsten reduziert. Darüber hinaus wurde der Trockenmasse-Partitionierung in Bezug auf die Kontrollpflanzen verändert und eine geringere Zuteilung der Trockenmasse in den Wurzeln von Pflanzen, die dem höheren Fe-Gehalt ausgesetzt waren, wurde beobachtet. Auf diese Weise wurde beobachtet, dass die Sisalpflanzen für das überschüssige Fe mäßig tolerant sind, aber wenn 300 ppm des Metalls ausgesetzt wurden, wurde der Wert der an dem Wachstum beteiligten Variablen drastisch reduziert.
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F. Casierra-Posada, J.D. Cortés-Bayona and J. Cutler declare that they have no competing interests.
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Casierra-Posada, F., Cortés-Bayona, J.D. & Cutler, J. Effect of Iron Excess on Growth of Sisal Plants (Furcraea hexapetala). Gesunde Pflanzen 69, 123–129 (2017). https://doi.org/10.1007/s10343-017-0396-6
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DOI: https://doi.org/10.1007/s10343-017-0396-6
Keywords
- Abiotic stress
- Heavy metals
- Crassulacean Acid Metabolism (CAM)
- Leaf area
- Growth rates
- Dry matter partitioning