Abstract
The role of Fe DTPA (Diethylenetriaminepentaacetic acid) in the occurrence of a specific physiological disorder affecting the leaves of cutting geranium was investigated. Industry reports indicate that affected leaves have excessively high concentrations of Fe and sometimes Mn. Symptoms of the disorder first affect maturing leaves, and may in severe cases affect immature leaves. Symptoms progress from marginal/interveinal chlorosis and necrosis, to affect whole leaf necrosis. Rooted cuttings were grown in a soil-less peat based media, with Fe DTPA concentrations of 1, 5, 15, and 20 ppm. Iron and manganese leaf concentrations were significantly higher in symptom than in non-symptom tissue and increased as Fe DTPA treatment level increased. As Fe DTPA treatment level increased there was a significant increase in dry weight of symptom tissue and a decrease in non-symptom tissue dry weight. Plants grown in media amended with dolomite (pH> 5.8) had similar degrees of symptom occurrence compared to plants grown in unamended media (pH ≈ 5.4).
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Claims 5
Claim · model-written summary
Symptomatic geranium leaf tissue had higher iron and manganese concentrations than nonsymptomatic tissue.
Verbatim
t0“cutting geranium”
e0“Iron and manganese leaf concentrations were significantly higher in symptom than in non-symptom tissue”
Claim · model-written summary
Iron and manganese leaf concentrations increased with Fe DTPA level.
- Taxon
- cutting geraniumt0
- Organ / stage
- leafe0
- Treatment
- Fe DTPAe0
- Outcome
- Iron and manganese leaf concentrationse0
- Direction
- increasede0
Not reportedComparator
Verbatim
t0“cutting geranium”
e0“Iron and manganese leaf concentrations were significantly higher in symptom than in non-symptom tissue and increased as Fe DTPA treatment level increased”
Claim · model-written summary
Higher Fe DTPA increased dry weight of symptomatic tissue.
Not reportedComparator
Verbatim
t0“cutting geranium”
e0“As Fe DTPA treatment level increased there was a significant increase in dry weight of symptom tissue”
Claim · model-written summary
Higher Fe DTPA decreased dry weight of nonsymptomatic tissue.
Not reportedComparator
Verbatim
t0“cutting geranium”
e0“As Fe DTPA treatment level increased there was a significant increase in dry weight of symptom tissue and a decrease in non-symptom tissue dry weight”
Claim · model-written summary
Dolomite-amended and unamended media had similar symptom occurrence.
Verbatim
t0“cutting geranium”
e0“Plants grown in media amended with dolomite (pH> 5.8) had similar degrees of symptom occurrence compared to plants grown in unamended media (pH ≈ 5.4)”