Abstract
The role of urea in the translocation of (59) Fe from (59) FeEDTA-treated leaves was studied in durum wheat (Triticum durum) grown for 2 weeks in nutrient solution and until grain maturation in soil culture. Five-cm long tips of the first leaf of young wheat seedlings or flag leaves at the early milk stage were immersed twice daily for 10 s in (59) FeEDTA solutions containing increasing amounts of urea (0, 0.2, 0.4 and 0.8% w/v) over 5 days. In the experiment with young wheat seedlings, urea inclusion in the (59) FeEDTA solution increased significantly translocation of (59) Fe from the treated leaf into roots and the untreated part of shoots. When (59) Fe-treated leaves were induced into senescence by keeping them in the dark, there was a strong (59) Fe translocation from these leaves. Adding urea to the (59) Fe solution did not result in an additional increase in Fe translocation from the dark-induced senescent leaves. In the experiment conducted in the greenhouse in soil culture until grain maturation, translocation of (59) Fe from the flag leaves into grains was also strongly promoted by urea, whereas (59) Fe translocation from flag leaves into the untreated shoot was low and not affected by urea. In conclusion, urea contributes to transportation of the leaf-absorbed Fe into sink organs. Probably, nitrogen compounds formed after assimilation of foliar-applied urea (such as amino acids) contributed to Fe chelation and translocation to grains in wheat.
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Claims 6
Claim · model-written summary
Urea increased iron translocation from treated young leaves to roots and untreated shoots.
- Taxon
- wheat
Triticum aestivumt0 - Organ / stage
- treated leafe0
- Treatment
- urea inclusion in the (59) FeEDTA solutione0
- Outcome
- translocation of (59) Fe from the treated leaf into roots and the untreated part of shootse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“urea inclusion in the (59) FeEDTA solution increased significantly translocation of (59) Fe from the treated leaf into roots and the untreated part of shoots.”
t0“wheat”
Claim · model-written summary
Dark-induced senescence strongly promoted iron translocation from treated leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- keeping them in the darke0
- Outcome
- (59) Fe translocation from these leavese0
- Direction
- stronge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When (59) Fe-treated leaves were induced into senescence by keeping them in the dark, there was a strong (59) Fe translocation from these leaves.”
t0“wheat”
Claim · model-written summary
Urea did not further increase iron translocation from dark-induced senescent leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Adding urea to the (59) Fe solutione0
- Outcome
- Fe translocation from the dark-induced senescent leavese0
- Direction
- did not result in an additional increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Adding urea to the (59) Fe solution did not result in an additional increase in Fe translocation from the dark-induced senescent leaves.”
t0“wheat”
Claim · model-written summary
Urea strongly promoted iron translocation from flag leaves to grains in greenhouse soil culture.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- ureae0
- Outcome
- translocation of (59) Fe from the flag leaves into grainse0
- Direction
- strongly promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“translocation of (59) Fe from the flag leaves into grains was also strongly promoted by urea”
t0“wheat”
Claim · model-written summary
Iron translocation from flag leaves into untreated shoots was low and unaffected by urea.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- ureae0
- Outcome
- (59) Fe translocation from flag leaves into the untreated shoote0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“(59) Fe translocation from flag leaves into the untreated shoot was low and not affected by urea”
t0“wheat”
Claim · model-written summary
The authors infer that urea assimilation products may help chelate and transport iron to grain.
- Taxon
- wheatTriticum aestivume0
- Compound
- amino acidse0
- Outcome
- Fe chelation and translocation to grainse0
- Qualifier
- Probablye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Probably, nitrogen compounds formed after assimilation of foliar-applied urea (such as amino acids) contributed to Fe chelation and translocation to grains in wheat.”
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