Abstract
Abstract Two experiments are described in which tomato plants (Lycopersicon esculentum L. var Ailsa Craig) were grown in water culture supplied with 10–300 μM Mn. Toxicity symptoms associated with a yield reduction were observed only in treatments in excess of 50 μM Mn indicating that this species is relatively tolerant of high Mn supply. Dark brown/black spots appeared first in the cotyledons. Similar symptoms were observed in the leaves, progressively from the oldest leaf. Manganese concentration in the shoot tissues ranged from 286 to 4240 μg. g‐1 dry weight. The high Mn concentration values found in the shoot tissues of the toxic plants indicate that Mn was highly mobile in the xylem as confirmed by xylem sap analysis. The concentrations of both Ca and Mg were lower in the smaller Mn toxic plants. Not only was uptake of Ca and Mg retarded but so also was the distribution of Ca and Mg to the younger tissues as illustrated by measurements of Ca and Mg concentrations along a leaf age sequence. This is in accord with the cation‐anion balance of the xylem exudates collected from decapitated plants. Higher cation exchange capacity (CEC) was found in the leaf tissues of toxic plants particularly in the older leaves but similar values of C.E.C were recorded for the younger leaf tissues of both control and toxic plants.
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Claims 9
Claim · model-written summary
Manganese above 50 μM was associated with toxicity symptoms and reduced yield.
- Taxon
- tomato plants
Solanum lycopersicume1 - Material
- Ailsa Craige1
- Treatment
- in excess of 50 μM Mne0
- Outcome
- yielde0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Toxicity symptoms associated with a yield reduction were observed only in treatments in excess of 50 μM Mn”
e1“tomato plants (Lycopersicon esculentum L. var Ailsa Craig)”
Claim · model-written summary
Dark spots appeared first in cotyledons and later in leaves from oldest onward.
- Taxon
- tomato plantsSolanum lycopersicume1
- Organ / stage
- cotyledonse0
- Outcome
- Dark brown/black spotse0
- Qualifier
- leaves, progressively from the oldest leafe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dark brown/black spots appeared first in the cotyledons. Similar symptoms were observed in the leaves, progressively from the oldest leaf.”
e1“tomato plants”
Claim · model-written summary
Shoot manganese concentration ranged from 286 to 4240 μg per g dry weight.
- Taxon
- tomato plantsSolanum lycopersicume1
- Organ / stage
- shoot tissuese0
- Outcome
- Manganese concentratione0
- Value
- 286 to 4240 μg. g‐1 dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Manganese concentration in the shoot tissues ranged from 286 to 4240 μg. g‐1 dry weight.”
e1“tomato plants”
Claim · model-written summary
High shoot Mn and xylem sap analysis indicated high xylem mobility of Mn.
- Taxon
- tomato plantsSolanum lycopersicume1
- Organ / stage
- shoot tissuese0
- Outcome
- Mn was highly mobile in the xyleme0
- Qualifier
- as confirmed by xylem sap analysise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high Mn concentration values found in the shoot tissues of the toxic plants indicate that Mn was highly mobile in the xylem as confirmed by xylem sap analysis.”
e1“tomato plants”
Claim · model-written summary
Calcium concentration was lower in smaller Mn-toxic plants.
- Taxon
- tomato plantsSolanum lycopersicume1
- Treatment
- Mne0
- Outcome
- concentrations of both Ca and Mge0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The concentrations of both Ca and Mg were lower in the smaller Mn toxic plants.”
e1“tomato plants”
Claim · model-written summary
Ca and Mg uptake was retarded in Mn-toxic plants.
- Taxon
- tomato plantsSolanum lycopersicume1
- Organ / stage
- younger tissuese0
- Outcome
- uptake of Ca and Mge0
- Direction
- retardede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Not only was uptake of Ca and Mg retarded but so also was the distribution of Ca and Mg to the younger tissues”
e1“tomato plants”
Claim · model-written summary
Ca and Mg distribution to younger tissues was retarded.
- Taxon
- tomato plantsSolanum lycopersicume2
- Organ / stage
- younger tissuese0
- Outcome
- distribution of Ca and Mg to the younger tissuese0
- Direction
- retardede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“distribution of Ca and Mg to the younger tissues”
e1“Not only was uptake of Ca and Mg retarded but so also was the distribution of Ca and Mg to the younger tissues”
e2“tomato plants”
Claim · model-written summary
Toxic plants had higher leaf cation exchange capacity, especially in older leaves.
- Taxon
- tomato plantsSolanum lycopersicume1
- Organ / stage
- leaf tissuese0
- Outcome
- cation exchange capacity (CEC)e0
- Direction
- Highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher cation exchange capacity (CEC) was found in the leaf tissues of toxic plants particularly in the older leaves”
e1“tomato plants”
Claim · model-written summary
Younger leaves had similar cation exchange capacity in control and toxic plants.
- Taxon
- tomato plantsSolanum lycopersicume1
- Organ / stage
- younger leaf tissuese0
- Outcome
- C.E.Ce0
- Direction
- similare0
- Comparator
- control and toxic plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“similar values of C.E.C were recorded for the younger leaf tissues of both control and toxic plants.”
e1“tomato plants”
The same questions in other papers
manganese atom · yield · Solanum lycopersicum (tomato)Positive and negative results
3 papers in the same direction as this paper · 7 in the opposite direction
- no effect
- positive
- positive
7 papers more in this group
See all 11 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.