Abstract
S ummary The effects of iron deficiency on the growth and metabolism of isolated pea roots grown in sterile culture have been analysed. Changes were followed in whole routs sampled at intervals and in successive sections of roots sampled at a critical stage of deficiency. Transfer of deficient roots to complete nutrient after varying periods in the absence of iron showed the growth restriction was reversible for at least 6 days. Results suggest that the complete cessation of cell division after 6 days in iron‐deficient culture was due primarily to a disturbance localized in the apical meristematic cells. Changes which occurred in the levels of protein nitrogen, ethanol‐soluble nitrogen, amino acids, soluble carbohydrates and respiration are mainly attributed to the cessation of cell division rather than the cause of it. The rate of cell expansion was unaffected by iron deficiency but the final size of mature cells was reduced. Addition of iron to deficient roots stimulated cell division more rapidly than protein synthesis or respiration rate. Insofar as the serial‐sectioning technique used enabled separation to be made of cell division and cell enlargement, the results suggest that the effect of iron deficiency is confined primarily to the former. In addition, the final phase of cell maturation may also be affected but the evidence was inconclusive and these effects may not be determined directly by depletion of the iron supply. Evidence is presented showing that the metabolic changes associated with the transition from cell division through cell expansion to cell maturation depend on the source of root inocula used. Seedling roots showed marked changes in metabolism and meristem size when first isolated due to the depletion of metabolites translocated from the germinated seed, and it was necessary to use inocula taken from cultured excised roots to provide valid data on the changes due to increasing cell age.
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Claims 10
Claim · model-written summary
Results suggest that the complete cessation of cell division in iron-deficient culture was due primarily to a disturbance localized in the apical meristematic cells.
- Taxon
- pea
Lathyrus oleraceuse1 - Organ / stage
- apical meristematic cellse2
- Outcome
- cessation of cell divisione0
- Qualifier
- disturbance localized in the apical meristematic cellse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“isolated pea roots grown in sterile culture”
e0“the complete cessation of cell division after 6 days”
e2“was due primarily to a disturbance localized in the apical meristematic cells”
Claim · model-written summary
Growth restriction caused by iron deficiency was reversible for at least 6 days after transfer to complete nutrient.
- Taxon
- peaLathyrus oleraceuse1
- Treatment
- absence of irone0
- Outcome
- growth restrictione0
- Comparator
- complete nutriente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“isolated pea roots grown in sterile culture”
e0“Transfer of deficient roots to complete nutrient after varying periods in the absence of iron showed the growth restriction was reversible for at least 6 days”
Claim · model-written summary
Changes in protein nitrogen in iron-deficient roots are mainly attributed to the cessation of cell division rather than its cause.
- Taxon
- peaLathyrus oleraceuse1
- Outcome
- protein nitrogene0
- Qualifier
- mainly attributed to the cessation of cell division rather than the cause of ite2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“isolated pea roots grown in sterile culture”
e0“Changes which occurred in the levels of protein nitrogen”
e2“are mainly attributed to the cessation of cell division rather than the cause of it”
Claim · model-written summary
Changes in amino acids, soluble carbohydrates and respiration in iron-deficient roots are mainly attributed to the cessation of cell division rather than its cause.
- Taxon
- peaLathyrus oleraceuse1
- Outcome
- amino acids, soluble carbohydrates and respiratione3
- Qualifier
- mainly attributed to the cessation of cell division rather than the cause of ite3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“isolated pea roots grown in sterile culture”
e3“amino acids, soluble carbohydrates and respiration are mainly attributed to the cessation of cell division rather than the cause of it”
Claim · model-written summary
The rate of cell expansion was unaffected by iron deficiency.
- Taxon
- peaLathyrus oleraceuse1
- Treatment
- iron deficiencye2
- Outcome
- rate of cell expansione2
- Direction
- unaffectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“isolated pea roots grown in sterile culture”
e2“The rate of cell expansion was unaffected by iron deficiency”
Claim · model-written summary
The final size of mature cells was reduced by iron deficiency.
- Taxon
- peaLathyrus oleraceuse1
- Treatment
- iron deficiencye2
- Outcome
- final size of mature cellse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“isolated pea roots grown in sterile culture”
e2“The rate of cell expansion was unaffected by iron deficiency”
e0“the final size of mature cells was reduced”
Claim · model-written summary
Adding iron to deficient roots stimulated cell division more rapidly than protein synthesis or respiration rate.
- Taxon
- peaLathyrus oleraceuse1
- Treatment
- Addition of irone0
- Outcome
- cell divisione0
- Direction
- stimulatede0
- Comparator
- protein synthesis or respiration ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“isolated pea roots grown in sterile culture”
e0“Addition of iron to deficient roots stimulated cell division more rapidly than protein synthesis or respiration rate”
Claim · model-written summary
The effect of iron deficiency is confined primarily to cell division rather than cell enlargement.
- Taxon
- peaLathyrus oleraceuse1
- Outcome
- effect of iron deficiencye0
- Qualifier
- confined primarily to the formere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“isolated pea roots grown in sterile culture”
e0“the results suggest that the effect of iron deficiency is confined primarily to the former”
Claim · model-written summary
Metabolic changes associated with the transition from cell division through cell expansion to cell maturation depend on the source of root inocula used.
- Taxon
- peaLathyrus oleraceuse1
- Outcome
- metabolic changes associated with the transitione0
- Qualifier
- depend on the source of root inocula usede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“isolated pea roots grown in sterile culture”
e0“Evidence is presented showing that the metabolic changes associated with the transition from cell division through cell expansion to cell maturation depend on the source of root inocula used”
Claim · model-written summary
Seedling roots showed marked changes in metabolism and meristem size when first isolated, due to depletion of metabolites translocated from the germinated seed.
- Taxon
- peaLathyrus oleraceuse1
- Organ / stage
- Seedling rootse0
- Outcome
- metabolism and meristem sizee0
- Qualifier
- the depletion of metabolites translocated from the germinated seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“isolated pea roots grown in sterile culture”
e0“Seedling roots showed marked changes in metabolism and meristem size when first isolated due to the depletion of metabolites translocated from the germinated seed”
The same questions in other papers
iron atom · growth · Lathyrus oleraceus (pea)Positive and negative results
9 papers in the same direction as this paper · 2 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- negative
- positive
8 papers more in this group
See all 12 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.