Abstract
A hydroponic experiment was conducted to study the effects of potassium on growth character,acid phosphatase enzyme (APA) and pectin methylisterase enzyme (PME) activity,root pectin,hemicellulose 1(HC1) and hemicellulose 2 (HC2) contents of rice under 250mg · L-1 Fe2+(EDTA-Fe2+) toxicity.The results showed that the growth of rice was inhibited in both Fe-resistant genotype of xieyou9308 and Fe-sensitive genotype of Ⅱyou838 when the two cultivars were exposed to 250mg·L-1 Fe2+ solution for 7d and 14d.The activities of acid phosphatase enzyme and pectin methylisterase enzyme were enhanced for both two rice genotypes,the contents of root pectin,hemicellulose 1 and hemicellulose 2 were increased under iron toxicity.Ⅱyou838 always showed a higher enzyme activity and cell-wall polysaccharide contents than xieyou9308,and its root cell-wall pectin,hemicellulose 1 and hemicellulose 2 contents were increased by a large margin,showing its sensitivity to iron toxicity.With the extension of processing time,the effects of iron toxicity on the relative root length,root pectin methylisterase enzyme activity,hemicellulose 1 and hemicellulose 2 contents of both two genotypes were more significant,but the acid phosphatese enzyme activity and pectin content did not change significantly.The root length was an important indicator of iron toxicity,and had an important relationship with the cell-wall polysaccharide content;High iron toxicity led to accumulation of cell-wall polysaccharide pectin and high pectin methylisterase enzyme activity,increased the number of free carboxyl groups which have more iron-binding sites;The skim membrane increased seriously when the acid phosphatase activity became high,then the membrane structure and function were destructed.The different potassium concentrations could decrease the enzyme activity and the cell-wall polysaccharide content to some extent.When the exogenous potassium concentration was 200 mg·L-1,the relative root length,acid phosphatese enzyme activity,hemicellulose 1 content of both two genotypes and hemicellulose 2 content of Ⅱyou838 were relieved close to the control group value;When the exogenous potassium concentration was 400 mg·L-1,pectin methylisterase enzyme activity,root cell-wall pectin content of both two genotypes and hemicellulose 2 content of xieyou9308 were relieved close to the control group value.As the concentration of exogenous potassium increased,the iron toxicity to both two genotypes of rice was relieved in different degrees.Exogenous potassium decreased the enzyme activity and the cell-wall polysaccharide contents significantly,While the exogenous potassium concentration was higher than 200 mg·L-1,the potassium would also create new form of toxicity to rice,the relative root length began to decrease,the acid phosphatese enzyme activity,hemicellulose 1 and hemicellulose 2 contents were enhanced again,which suggested that exogenous potassium could alleviate iron toxicity of rice to some extent,but just a limited capacity to alleviate iron toxicity not complete remission.Our study suggested that iron tended to modify the metabolism of cell-wall polysaccharides and thus made cell-wall more thick and rigid,inhibited the elongation of root cells and the growth of rice roots,thereby improved their tolerance to iron toxicity.
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Claims 14
Claim · model-written summary
Iron exposure inhibited growth of both rice genotypes after 7 and 14 days.
- Taxon
- rice
Oryza sativae0 - Material
- xieyou9308 and Fe-sensitive genotype of Ⅱyou838e0
- Treatment
- 250mg·L-1 Fe2+ solution for 7d and 14de0
- Outcome
- growth of ricee0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the growth of rice was inhibited in both Fe-resistant genotype of xieyou9308 and Fe-sensitive genotype of Ⅱyou838 when the two cultivars were exposed to 250mg·L-1 Fe2+ solution for 7d and 14d”
Claim · model-written summary
Iron toxicity increased acid phosphatase and pectin methylisterase activity in both genotypes.
- Taxon
- riceOryza sativae0
- Gene
- acid phosphatase enzyme and pectin methylisterase enzymee0
- Outcome
- activities of acid phosphatase enzyme and pectin methylisterase enzymee0
- Direction
- enhancede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of acid phosphatase enzyme and pectin methylisterase enzyme were enhanced for both two rice genotypes”
Claim · model-written summary
Iron toxicity increased root pectin, hemicellulose 1 and hemicellulose 2 contents.
- Taxon
- riceOryza sativat0
- Organ / stage
- roote0
- Treatment
- iron toxicitye0
- Outcome
- contents of root pectin,hemicellulose 1 and hemicellulose 2e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the contents of root pectin,hemicellulose 1 and hemicellulose 2 were increased under iron toxicity”
t0“rice”
Claim · model-written summary
The sensitive genotype had higher enzyme activity and cell-wall polysaccharide content than the resistant genotype.
- Taxon
- riceOryza sativat0
- Material
- Ⅱyou838e0
- Outcome
- enzyme activity and cell-wall polysaccharide contentse0
- Direction
- highere0
- Comparator
- xieyou9308e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ⅱyou838 always showed a higher enzyme activity and cell-wall polysaccharide contents than xieyou9308”
t0“rice”
Claim · model-written summary
Longer iron exposure had more significant effects on relative root length, pectin methylisterase activity and hemicellulose contents.
- Taxon
- riceOryza sativat0
- Treatment
- iron toxicitye0
- Outcome
- relative root length,root pectin methylisterase enzyme activity,hemicellulose 1 and hemicellulose 2 contentse0
- Qualifier
- extension of processing timee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the extension of processing time,the effects of iron toxicity on the relative root length,root pectin methylisterase enzyme activity,hemicellulose 1 and hemicellulose 2 contents of both two genotypes were more significant”
t0“rice”
Claim · model-written summary
Acid phosphatese enzyme activity and pectin content did not change significantly with longer exposure.
- Taxon
- riceOryza sativat0
- Gene
- acid phosphatese enzymee0
- Outcome
- acid phosphatese enzyme activity and pectin contente0
- Direction
- did not changee0
Not reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the acid phosphatese enzyme activity and pectin content did not change significantly”
t0“rice”
Claim · model-written summary
Potassium decreased enzyme activity and cell-wall polysaccharide content.
- Taxon
- riceOryza sativat0
- Treatment
- different potassium concentrationse0
- Outcome
- enzyme activity and the cell-wall polysaccharide contente0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The different potassium concentrations could decrease the enzyme activity and the cell-wall polysaccharide content to some extent”
t0“rice”
Claim · model-written summary
At 200 mg/L potassium, relative root length, acid phosphatese activity and hemicellulose 1 in both genotypes approached control values.
- Taxon
- riceOryza sativat0
- Material
- both two genotypese0
- Treatment
- exogenous potassium concentration was 200 mg·L-1e0
- Outcome
- relative root length,acid phosphatese enzyme activity,hemicellulose 1 contente0
- Direction
- relieved close toe0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the exogenous potassium concentration was 200 mg·L-1,the relative root length,acid phosphatese enzyme activity,hemicellulose 1 content of both two genotypes and hemicellulose 2 content of Ⅱyou838 were relieved close to the control group value”
t0“rice”
Claim · model-written summary
At 200 mg/L potassium, hemicellulose 2 content in Ⅱyou838 approached control values.
- Taxon
- riceOryza sativat0
- Material
- Ⅱyou838e0
- Treatment
- exogenous potassium concentration was 200 mg·L-1e0
- Outcome
- hemicellulose 2 contente0
- Direction
- relieved close toe0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the exogenous potassium concentration was 200 mg·L-1,the relative root length,acid phosphatese enzyme activity,hemicellulose 1 content of both two genotypes and hemicellulose 2 content of Ⅱyou838 were relieved close to the control group value”
t0“rice”
Claim · model-written summary
At 400 mg/L potassium, pectin methylisterase activity and root pectin in both genotypes approached control values.
- Taxon
- riceOryza sativat0
- Treatment
- exogenous potassium concentration was 400 mg·L-1e0
- Outcome
- pectin methylisterase enzyme activity,root cell-wall pectin contente0
- Direction
- relieved close toe0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the exogenous potassium concentration was 400 mg·L-1,pectin methylisterase enzyme activity,root cell-wall pectin content of both two genotypes and hemicellulose 2 content of xieyou9308 were relieved close to the control group value”
t0“rice”
Claim · model-written summary
At 400 mg/L potassium, hemicellulose 2 content in xieyou9308 approached control values.
- Taxon
- riceOryza sativat0
- Material
- xieyou9308e0
- Treatment
- exogenous potassium concentration was 400 mg·L-1e0
- Outcome
- hemicellulose 2 contente0
- Direction
- relieved close toe0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the exogenous potassium concentration was 400 mg·L-1,pectin methylisterase enzyme activity,root cell-wall pectin content of both two genotypes and hemicellulose 2 content of xieyou9308 were relieved close to the control group value”
t0“rice”
Claim · model-written summary
Potassium above 200 mg/L decreased relative root length and increased acid phosphatese and hemicellulose contents again.
- Taxon
- riceOryza sativae0
- Treatment
- exogenous potassium concentration was higher than 200 mg·L-1e0
- Outcome
- relative root lengthe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the exogenous potassium concentration was higher than 200 mg·L-1,the potassium would also create new form of toxicity to rice,the relative root length began to decrease,the acid phosphatese enzyme activity,hemicellulose 1 and hemicellulose 2 contents were enhanced again”
Claim · model-written summary
At potassium above 200 mg/L, acid phosphatese activity and hemicellulose contents increased again.
- Taxon
- riceOryza sativae0
- Treatment
- exogenous potassium concentration was higher than 200 mg·L-1e0
- Outcome
- acid phosphatese enzyme activity,hemicellulose 1 and hemicellulose 2 contentse0
- Direction
- enhanced againe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the exogenous potassium concentration was higher than 200 mg·L-1,the potassium would also create new form of toxicity to rice,the relative root length began to decrease,the acid phosphatese enzyme activity,hemicellulose 1 and hemicellulose 2 contents were enhanced again”
Claim · model-written summary
The authors proposed that iron changed cell-wall polysaccharide metabolism, thickening walls and inhibiting root elongation.
- Taxon
- riceOryza sativae0
- Outcome
- elongation of root cells and the growth of rice rootse0
- Direction
- inhibitede0
- Qualifier
- metabolism of cell-wall polysaccharidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“iron tended to modify the metabolism of cell-wall polysaccharides and thus made cell-wall more thick and rigid,inhibited the elongation of root cells and the growth of rice roots,thereby improved their tolerance to iron toxicity”
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