Abstract
Typical morphological and physiological changes were observed in iron deficient sunflower ( Helianthus annuus L. cv. Sobrid) roots. These changes, or so‐called iron stress reactions, are exclusively confined to the root tips. Typical morphological changes included additional cell division in the rhizodermis layer and enhanced formation of root hairs, leading to an increase in root diameter (“swollen root tips”). These morphological changes were correlated with physiological changes such as increased release of protons, accumulation of phenols in the rhizodermis, and an increased ability of the roots to reduce iron‐III compounds (“reducing capacity”). A marked increase in ability of the root tips to take up and translocate iron occurred simultaneously with these changes. There is good evidence that these morphological and physiological changes are reflections of an effective regulatory mechanism for enhanced mobilization of sparingly soluble iron‐III compounds in the rhizosphere and for iron uptake by sunflower plants.
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Claims 5
Claim · model-written summary
Iron stress reactions in sunflower were confined to root tips.
- Taxon
- sunflower
Helianthus annuust0 - Organ / stage
- root tipse0
- Outcome
- iron stress reactionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These changes, or so‐called iron stress reactions, are exclusively confined to the root tips.”
t0“sunflower”
Claim · model-written summary
Iron deficient sunflower roots showed added rhizodermal cell division and enhanced root hair formation, increasing root diameter.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- root tipst0
- Treatment
- iron deficiency stresst0
- Outcome
- additional cell division in the rhizodermis layer and enhanced formation of root hairse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Typical morphological changes included additional cell division in the rhizodermis layer and enhanced formation of root hairs, leading to an increase in root diameter (“swollen root tips”).”
t0“Iron deficiency stress induced morphological and physiological changes in root tips of sunflower”
Claim · model-written summary
Sunflower root physiological changes included greater proton release, phenol accumulation, and iron III reducing capacity.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- iron deficiency stresst0
- Outcome
- release of protons, accumulation of phenols in the rhizodermis, and an increased ability of the roots to reduce iron‐III compoundse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These morphological changes were correlated with physiological changes such as increased release of protons, accumulation of phenols in the rhizodermis, and an increased ability of the roots to reduce iron‐III compounds (“reducing capacity”).”
t0“Iron deficiency stress induced morphological and physiological changes in root tips of sunflower”
Claim · model-written summary
Sunflower root tips increased iron uptake and translocation capacity.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- root tipse0
- Treatment
- iron deficiency stresst0
- Outcome
- ability of the root tips to take up and translocate irone0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A marked increase in ability of the root tips to take up and translocate iron occurred simultaneously with these changes.”
t0“Iron deficiency stress induced morphological and physiological changes in root tips of sunflower”
Claim · model-written summary
Authors interpret these reactions as regulation enhancing iron mobilization and uptake.
- Taxon
- sunflowerHelianthus annuuse0
- Outcome
- enhanced mobilization of sparingly soluble iron‐III compounds in the rhizosphere and for iron uptakee0
- Qualifier
- effective regulatory mechanisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There is good evidence that these morphological and physiological changes are reflections of an effective regulatory mechanism for enhanced mobilization of sparingly soluble iron‐III compounds in the rhizosphere and for iron uptake by sunflower plants.”
The same questions in other papers
iron atom · nutrient: content · Helianthus annuus (common sunflower)Positive and negative results
1 paper in the same direction as this paper · 8 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- positive
6 papers more in this group
See all 10 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.