Abstract
Abstract Two bush bean cultivars (Phaseolus vulgarls L. cv. 'Wonder Crop 2' and 'Green Lord'), previously classified as sensitive or tolerant to excess Mn, were grown in a growth chamber for 12 days, in Hoagland No.2 nutrient solution containing 0.05, 0.2, 0.5 or 1.0 ppm Mn as MnCl2 · 4H2O, with 1 ppm Fe as Fe‐EDTA, at an initial pH 5.0. The cultivars were characterized with respect to Mn toxicity symptoms, growth and distribution of Mn and Fe within the plants. 'Wonder Crop 2' ('WC‐2') was much more sensitive to Mn toxicity than 'Green Lord' ('GL'). With 1.0 ppm Mn in the solution, Mn‐sensitive 'WC‐2' showed a 31% growth reduction in total dry weight in comparison to plants grown at 0.05 ppm Mn. However, Mn‐tolerant 'GL' showed no growth reduction under the same conditions. Dry matter distribution in the primary leaves and steins of Mn‐sensitive 'WC‐2' significantly increased with increasing Mn concentration in the solution, but that of the roots significantly decreased. In Mn‐tolerant 'GL', Mn in the nutrient solution had no significant effect on dry matter distribution. In both cultivars, Mn concentration in plant tissues increased in proportion to Mn level in the nutrient solution. However, a significantly higher concentration of tissue Mn was required to produce Mn toxicity symptoms in 'GL' than in 'WC‐2'. The Fe concentration in the leaves was not affected by Mn treatment in either cultivar. The Mn‐sensitive 'WC‐2' tended to accumulate more Mn and less Fe in younger leaves and more Fe in roots than did Mn‐tolerant 'GL'. Manganese inhibited the stem exudate production in Mn‐sensitive 'WC‐2' but not in Mn‐tolerant 'GL'. However, the total amount of Fe transported per unit root mass was significantly higher in Mn‐tolerant 'GL' than that in Mn‐sensitive 'WC‐2'. The overall evidence indicated that the superior Mn tolerance of 'GL' bush bean, compared with 'WC‐2', is associated with lower transport of Mn and higher transport of Fe to young leaves, and a greater internal tolerance to a given Mn concentration within the leaves. Key words: Mn toxicityFe deficiencydifferential toleranceMn and Fe uptakestem exudate Phaseolus vulgarls L.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 16
Claim · model-written summary
'WC‐2' was much more sensitive to Mn toxicity than 'GL'.
Verbatim
e0“'Wonder Crop 2' ('WC‐2') was much more sensitive to Mn toxicity than 'Green Lord' ('GL').”
t0“bush bean cultivars”
Claim · model-written summary
At 1.0 ppm Mn, 'WC‐2' total dry weight was reduced 31% versus 0.05 ppm Mn.
Verbatim
e0“With 1.0 ppm Mn in the solution, Mn‐sensitive 'WC‐2' showed a 31% growth reduction in total dry weight in comparison to plants grown at 0.05 ppm Mn.”
t0“bush bean cultivars”
Claim · model-written summary
'GL' had no growth reduction under the same Mn conditions.
Not reportedComparator
Verbatim
e0“However, Mn‐tolerant 'GL' showed no growth reduction under the same conditions.”
t0“MN and Fe in two bush bean cultivars”
Claim · model-written summary
Increasing solution Mn increased primary-leaf and stem dry matter distribution in 'WC‐2'.
Verbatim
e0“Dry matter distribution in the primary leaves and steins of Mn‐sensitive 'WC‐2' significantly increased with increasing Mn concentration in the solution, but that of the roots significantly decreased.”
t0“bush bean cultivars”
Claim · model-written summary
Increasing solution Mn decreased root dry matter distribution in 'WC‐2'.
Verbatim
e0“Dry matter distribution in the primary leaves and steins of Mn‐sensitive 'WC‐2' significantly increased with increasing Mn concentration in the solution, but that of the roots significantly decreased.”
t0“bush bean cultivars”
Claim · model-written summary
Solution Mn had no significant effect on dry matter distribution in 'GL'.
- Taxon
- bush beant0
- Material
- 'GL'e0
- Treatment
- Mn in the nutrient solutione0
- Outcome
- dry matter distributione0
- Direction
- no significant effecte0
Not reportedComparator
Verbatim
e0“In Mn‐tolerant 'GL', Mn in the nutrient solution had no significant effect on dry matter distribution.”
t0“bush bean cultivars”
Claim · model-written summary
Tissue Mn rose in proportion to solution Mn in both cultivars.
Verbatim
e0“In both cultivars, Mn concentration in plant tissues increased in proportion to Mn level in the nutrient solution.”
t0“bush bean cultivars”
Claim · model-written summary
'GL' required a higher tissue Mn concentration than 'WC‐2' for toxicity symptoms.
Verbatim
e0“However, a significantly higher concentration of tissue Mn was required to produce Mn toxicity symptoms in 'GL' than in 'WC‐2'.”
t0“bush bean cultivars”
Claim · model-written summary
Mn treatment did not affect leaf Fe concentration in either cultivar.
- Taxon
- bush beant0
- Organ / stage
- leavese0
- Treatment
- Mn treatmente0
- Outcome
- Fe concentratione0
- Direction
- not affectede0
Not reportedComparator
Verbatim
e0“The Fe concentration in the leaves was not affected by Mn treatment in either cultivar.”
t0“bush bean cultivars”
Claim · model-written summary
'WC‐2' tended to accumulate more Mn in younger leaves than 'GL'.
Verbatim
e0“The Mn‐sensitive 'WC‐2' tended to accumulate more Mn and less Fe in younger leaves and more Fe in roots than did Mn‐tolerant 'GL'.”
t0“bush bean cultivars”
Claim · model-written summary
'WC‐2' tended to accumulate less Fe in younger leaves than 'GL'.
Verbatim
e0“The Mn‐sensitive 'WC‐2' tended to accumulate more Mn and less Fe in younger leaves and more Fe in roots than did Mn‐tolerant 'GL'.”
t0“bush bean cultivars”
Claim · model-written summary
'WC‐2' tended to accumulate more Fe in roots than 'GL'.
Verbatim
e0“The Mn‐sensitive 'WC‐2' tended to accumulate more Mn and less Fe in younger leaves and more Fe in roots than did Mn‐tolerant 'GL'.”
t0“bush bean cultivars”
Claim · model-written summary
Mn inhibited stem exudate production in 'WC‐2'.
- Taxon
- bush beant0
- Material
- 'WC‐2'e0
- Treatment
- Manganesee0
- Outcome
- stem exudate productione0
- Direction
- inhibitede0
Not reportedComparator
Verbatim
e0“Manganese inhibited the stem exudate production in Mn‐sensitive 'WC‐2' but not in Mn‐tolerant 'GL'.”
t0“bush bean cultivars”
Claim · model-written summary
Mn did not inhibit stem exudate production in 'GL'.
Not reportedComparator
Verbatim
e0“Manganese inhibited the stem exudate production in Mn‐sensitive 'WC‐2' but not in Mn‐tolerant 'GL'.”
t0“bush bean cultivars”
Claim · model-written summary
Fe transport per unit root mass was higher in 'GL' than 'WC‐2'.
Verbatim
e0“However, the total amount of Fe transported per unit root mass was significantly higher in Mn‐tolerant 'GL' than that in Mn‐sensitive 'WC‐2'.”
t0“bush bean cultivars”
Claim · model-written summary
The authors associate 'GL' Mn tolerance with lower Mn transport, higher Fe transport to young leaves, and internal Mn tolerance.
- Taxon
- bush beane0
- Material
- 'GL'e0
- Outcome
- superior Mn tolerancee0
- Qualifier
- lower transport of Mn and higher transport of Fe to young leaves, and a greater internal tolerancee0
- Comparator
- 'WC‐2'e0
Not reportedDirection
Verbatim
e0“The overall evidence indicated that the superior Mn tolerance of 'GL' bush bean, compared with 'WC‐2', is associated with lower transport of Mn and higher transport of Fe to young leaves, and a greater internal tolerance to a given Mn concentration within the leaves.”
The same questions in other papers
manganese atom · yield · Phaseolus vulgaris (common bean)Results differ
4 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →manganese atom · growth · Phaseolus vulgaris (common bean)Positive and negative results
4 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 papers →manganese atom · nutrient: content · Phaseolus vulgaris (common bean)Results agree
4 papers in the same direction as this paper
- no effect
- negative
- negative
1 paper more in this group
See all 5 papers →fertilization · growth · Phaseolus vulgaris (common bean)Positive and negative results
21 papers in the same direction as this paper · 121 in the opposite direction
- positive
- positive
- positive
139 papers more in this group
See all 143 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.