Abstract
【Objective】 The aim of the study was to provide a theoretical basis on water-logging tolerance by comparing the difference in root traits acclimatization to stress environment and form of nitrogen supply.【Method】 Effect of water conditions(water-logging stress and non-water-logging stress) and nitrogen forms,supplied as 7.5 mmol/L(NH4)2SO4,7.5 mmol/L Ca(NO3)2) and the mixture of 7.5 mmol/L(NH4)2SO4 and 7.5 mmol/L Ca(NO3)2 on roots volume,gas volume in root,amount of bleeding sap,roots dehydrogenase activity,amount of nitrogen accumulation,root nitrogen,phosphorus and potassium content of maize(Zea mays L.) plants at seeding stage was carried out by using sand culture experiment.【Result】 The result showed that,under non water-logging stress conditions,the mixture of ammonium and nitrate improves the growth of maize plants over that with ammonium or nitrate alone,while stress tolerance of different parts of maize plants supplied with ammonium was higher than that with the other nitrogen forms,roots showed the highest dry biomass stress coefficient of different parts in ammonium fed maize plants,and the lowest in nitrate fed maize plants.That is to say,water-logging stress tolerance of maize plants supplied with different nitrogen forms depended on the response of the roots to water-logging stress in the experiment.Non water-logging stressed maize plants supplied with ammonium had much higher roots volume,gas volume in roots,and both of which increased in step with each other under water-logging stress conditions to keep relatively constant roots porosity,roots activity per roots biomass,nitrogen,phosphorus and potassium content,and at the same time,to enhance roots activity and amount of bleeding sap of total plant,nitrogen uptake,and the ratio of nitrogen content to phosphorus content,nitrogen content to potassium content and phosphorus content to potassium content,when compared with that of supplied with the other two nitrogen forms.【Conclusion】 Therefore,it revealed that nitrogen form is a major factor affecting maize plants responses to water-logging stress,and negative effects of the stress were alleviated by ammonium rather than nitrate supply,with the higher roots porosity and facilitating increase in gas volume in roots.
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Claims 8
Claim · model-written summary
Mixed ammonium and nitrate improved maize growth under non-waterlogged conditions.
- Treatment
- mixture of ammonium and nitratee0
- Outcome
- growthe0
- Direction
- improvese0
- Comparator
- ammonium or nitrate alonee0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under non water-logging stress conditions,the mixture of ammonium and nitrate improves the growth of maize plants over that with ammonium or nitrate alone”
Claim · model-written summary
Ammonium-fed maize had greater stress tolerance than other nitrogen forms.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stress tolerance of different parts of maize plants supplied with ammonium was higher than that with the other nitrogen forms”
Claim · model-written summary
Root dry-biomass stress coefficient was highest with ammonium and lowest with nitrate.
- Organ / stage
- rootse0
- Treatment
- ammoniume0
- Outcome
- dry biomass stress coefficiente0
- Direction
- higheste0
- Comparator
- nitratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“roots showed the highest dry biomass stress coefficient of different parts in ammonium fed maize plants,and the lowest in nitrate fed maize plants”
Claim · model-written summary
Ammonium-fed maize had higher root and gas volume under non-waterlogging.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non water-logging stressed maize plants supplied with ammonium had much higher roots volume,gas volume in roots”
Claim · model-written summary
Under waterlogging, root volume and gas volume rose together and root porosity remained relatively constant.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both of which increased in step with each other under water-logging stress conditions to keep relatively constant roots porosity”
t0“maize”
Claim · model-written summary
Ammonium supply enhanced root activity and bleeding sap compared with other nitrogen forms.
- Treatment
- ammoniume1
- Outcome
- roots activity and amount of bleeding sape0
- Direction
- enhancee0
- Comparator
- other two nitrogen formse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“to enhance roots activity and amount of bleeding sap of total plant,nitrogen uptake,and the ratio of nitrogen content to phosphorus content,nitrogen content to potassium content and phosphorus content to potassium content,when compared with that of supplied with the other two nitrogen forms”
t0“maize”
e1“under non water-logging stress conditions,the mixture of ammonium and nitrate improves the growth of maize plants over that with ammonium or nitrate alone”
Claim · model-written summary
Ammonium supply enhanced nitrogen uptake and nutrient ratios relative to other forms.
- Treatment
- ammoniume1
- Outcome
- nitrogen uptake,and the ratio of nitrogen content to phosphorus content,nitrogen content to potassium content and phosphorus content to potassium contente0
- Direction
- enhancee0
- Comparator
- other two nitrogen formse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“to enhance roots activity and amount of bleeding sap of total plant,nitrogen uptake,and the ratio of nitrogen content to phosphorus content,nitrogen content to potassium content and phosphorus content to potassium content,when compared with that of supplied with the other two nitrogen forms”
t0“maize”
e1“under non water-logging stress conditions,the mixture of ammonium and nitrate improves the growth of maize plants over that with ammonium or nitrate alone”
Claim · model-written summary
Ammonium rather than nitrate alleviated waterlogging effects.
- Treatment
- ammoniume0
- Outcome
- negative effects of the stresse0
- Direction
- alleviatede0
- Comparator
- nitrate supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“negative effects of the stress were alleviated by ammonium rather than nitrate supply”
t0“maize”
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