Abstract
Abstract A re‐evaluation of the literature on fe‐type Fe‐inefficiency in soybean indicated that fe‐types may not be able to express the Fe‐stress‐response in the presence of elevated phosphate. Experiments were conducted to measure Fe‐uptake‐translocation to shoots, Fe‐uptake rate, and Fe‐chelate reduction rate in Fe and fe soybeans grown under Fe‐stress at varied levels of P and Ca. Increased P significantly and substantially inhibited the increase in Fe uptake of fe‐types, and slightly affected that of Fe‐types. In contrast, peanut had a curvilinear response to increasing P (somewhat lower at intermediate P than at low or high P). The basis for fe‐type Fe‐inefficiency is failure of derepression of Fe‐stress‐response at levels of P found in the environment. This understanding was used to design a method to screen fe‐types, and tested experimentally. Fe_ and 'Wayne'‐type soybean cultivars were green, and fe‐types severely chlorotic in 1/5 Johnson nutrient solutions containing 200 μM P, 5 μM Fe, 10 μM EDDHA, and CaC03 to maintain pH at 7.5; Fe‐availability is controlled by a chelate buffer system. Higher chelator:Fe ratios, lower Fe, or higher P only Increased severity of chlorosis of fe types, having no effect on Fe‐ and 'Wayne'‐type cultivars. Chlorotic leaves contained less than 40 mg Fe/kg dry weight, while other microelements were at normal sufficient levels. The proposed method selectively screens fe‐types from other Fe‐efficiency types in soybean based on the inability of fe‐types to adapt to the availability of Fe in their environment in the presence of phosphate. Key words: IronchlorosisGlycine max L. Arachis hypogea Lchelatorsbathophenanthrolinedisulfonatereductionuptakeabsorptioniron deficiency
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Claims 13
Claim · model-written summary
Increased P significantly inhibited the increase in Fe uptake of fe-type soybean.
- Taxon
- soybean
Glycine maxt0 - Material
- fe‐typese0
- Treatment
- Increased Pe0
- Outcome
- increase in Fe uptakee0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e0“Increased P significantly and substantially inhibited the increase in Fe uptake of fe‐types, and slightly affected that of Fe‐types”
Claim · model-written summary
Increased P slightly affected the increase in Fe uptake of Fe-type soybean.
- Taxon
- soybeanGlycine maxt0
- Material
- Fe‐typese0
- Treatment
- Increased Pe0
- Outcome
- increase in Fe uptakee0
- Direction
- slightly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e0“Increased P significantly and substantially inhibited the increase in Fe uptake of fe‐types, and slightly affected that of Fe‐types”
Claim · model-written summary
Peanut had a curvilinear response to increasing P, with somewhat lower values at intermediate P than at low or high P.
- Taxon
- peanut
Arachis hypogaeat0 - Treatment
- increasing Pe1
- Outcome
- curvilinear responsee1
- Direction
- somewhat lowere1
- Comparator
- low or high Pe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e1“In contrast, peanut had a curvilinear response to increasing P (somewhat lower at intermediate P than at low or high P)”
Claim · model-written summary
Higher chelator:Fe ratios increased the severity of chlorosis of fe-type soybean.
- Taxon
- soybeanGlycine maxt0
- Material
- fe typese2
- Treatment
- Higher chelator:Fe ratiose2
- Outcome
- severity of chlorosise2
- Direction
- Increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e2“Higher chelator:Fe ratios, lower Fe, or higher P only Increased severity of chlorosis of fe types, having no effect on Fe‐ and 'Wayne'‐type cultivars”
Claim · model-written summary
Lower Fe increased the severity of chlorosis of fe-type soybean.
- Taxon
- soybeanGlycine maxt0
- Material
- fe typese2
- Treatment
- lower Fee2
- Outcome
- severity of chlorosise2
- Direction
- Increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e2“Higher chelator:Fe ratios, lower Fe, or higher P only Increased severity of chlorosis of fe types, having no effect on Fe‐ and 'Wayne'‐type cultivars”
Claim · model-written summary
Higher P increased the severity of chlorosis of fe-type soybean.
- Taxon
- soybeanGlycine maxt0
- Material
- fe typese2
- Treatment
- higher Pe2
- Outcome
- severity of chlorosise2
- Direction
- Increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e2“Higher chelator:Fe ratios, lower Fe, or higher P only Increased severity of chlorosis of fe types, having no effect on Fe‐ and 'Wayne'‐type cultivars”
Claim · model-written summary
Higher chelator:Fe ratios had no effect on chlorosis of Fe-type and Wayne-type soybean cultivars.
- Taxon
- soybeanGlycine maxt0
- Material
- Fe‐ and 'Wayne'‐type cultivarse2
- Treatment
- Higher chelator:Fe ratiose2
- Outcome
- severity of chlorosise2
- Direction
- no effecte2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e2“Higher chelator:Fe ratios, lower Fe, or higher P only Increased severity of chlorosis of fe types, having no effect on Fe‐ and 'Wayne'‐type cultivars”
Claim · model-written summary
Lower Fe had no effect on chlorosis of Fe-type and Wayne-type soybean cultivars.
- Taxon
- soybeanGlycine maxt0
- Material
- Fe‐ and 'Wayne'‐type cultivarse2
- Treatment
- lower Fee2
- Outcome
- severity of chlorosise2
- Direction
- no effecte2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e2“Higher chelator:Fe ratios, lower Fe, or higher P only Increased severity of chlorosis of fe types, having no effect on Fe‐ and 'Wayne'‐type cultivars”
Claim · model-written summary
Higher P had no effect on chlorosis of Fe-type and Wayne-type soybean cultivars.
- Taxon
- soybeanGlycine maxt0
- Material
- Fe‐ and 'Wayne'‐type cultivarse2
- Treatment
- higher Pe2
- Outcome
- severity of chlorosise2
- Direction
- no effecte2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e2“Higher chelator:Fe ratios, lower Fe, or higher P only Increased severity of chlorosis of fe types, having no effect on Fe‐ and 'Wayne'‐type cultivars”
Claim · model-written summary
Chlorotic leaves of the soybean fe-type contained less than 40 mg Fe/kg dry weight.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- Chlorotic leavese3
- Outcome
- Fee3
- Value
- 40 mg Fe/kg dry weighte3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e3“Chlorotic leaves contained less than 40 mg Fe/kg dry weight, while other microelements were at normal sufficient levels”
Claim · model-written summary
Other microelements in chlorotic leaves were at normal sufficient levels.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- Chlorotic leavese3
- Outcome
- other microelementse3
- Qualifier
- normal sufficient levelse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e3“Chlorotic leaves contained less than 40 mg Fe/kg dry weight, while other microelements were at normal sufficient levels”
Claim · model-written summary
The proposed phosphate-based method selectively screens fe-type soybean from other Fe-efficiency types.
- Taxon
- soybeanGlycine maxe4
- Outcome
- selectively screens fe‐typese4
- Comparator
- other Fe‐efficiency typese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The proposed method selectively screens fe‐types from other Fe‐efficiency types in soybean based on the inability of fe‐types to adapt to the availability of Fe in their environment in the presence of phosphate”
Claim · model-written summary
Fe-inefficiency of fe-types is attributed to failure of derepression of the Fe-stress response at environmental phosphate levels.
- Taxon
- soybeanGlycine maxt0
- Outcome
- Fe‐inefficiencye5
- Qualifier
- failure of derepressione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of phosphate on regulation of Fe‐stress response in soybean and peanut”
e5“The basis for fe‐type Fe‐inefficiency is failure of derepression of Fe‐stress‐response at levels of P found in the environment”
The same questions in other papers
iron atom · physiology: pigments · Glycine max (soybean)Results differ
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