Abstract
With six mid maturing lowland and upland rice cultivars as materials, the changes in contents of putrescine (Put),spermidine (Spd) and spermine (Spm) in the flag leaf and their relationship with drought resistance under different status of soil moisture were investigated. The contents of Put, Spd and Spm in the leaf were decreased with the senescence of the leaf and were not correlated with the drought resistance of the cultivar under the well watered (control) condition. They were significantly increased under the water deficit stress (WS, soil water potential was kept at -0.05 MPa), and the increment trend was PutSpdSpm. The polyamines in the leaf were accumulated earlier and for a linger time under WS, and the relative contents (WS/control) of Spd and Spm were greater for drought resistant cultivars than for drought sensitive ones. The leaf water potential thresholds at the beginning of the accumulation of Put and Spd or Spm were (-0 50)-(-0 53) MPa and (-0 61)-(-0 62) MPa respectively for drought resistant cultivars and (-0 72)-(-0 74) MPa and (-0 81)-(-0 83) MPa respectively for drought sensitive ones. The relative contents of Spd and Spm were positively and very significantly correlated with drought resistant coefficients of cultivars ( r =0 921 ** -0 984 ** , P 0 01), and the correlation between the relative content of Put and drought resistant coefficients varied with determination stages. The grain yield was significantly increased when leaves were sprayed with 0 1 mmol/L Spd or Spm at the initial of WS. It was not affected by the treatment of 0 2 mmol/L Put but the grain yield was significantly decreased by treated leaves with 1 mmol/L MGBG [methlglyoxal bis (guanyl hydrazone), an inhibitor of polyamine synthesis]. The results suggest that the changes of polyamines in the flag leaf under WS are closely associated with drought resistance of cultivars. Earlier and longer duration of polyamines accumulation in the leaf under WS and greater relative contents of Spd and Spm are the important physiological characters for a drought resistant rice cultivar.
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Claims 16
Claim · model-written summary
Polyamine contents in the leaf decreased with leaf senescence.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- senescence of the leafe1
- Outcome
- contents of Put, Spd and Spme1
- Direction
- decreasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e1“The contents of Put, Spd and Spm in the leaf were decreased with the senescence of the leaf and were not correlated with the drought resistance of the cultivar under the well watered (control) condition”
Claim · model-written summary
Polyamine contents in the leaf were not correlated with drought resistance under well-watered conditions.
- Taxon
- riceOryza sativae0
- Outcome
- contents of Put, Spd and Spme1
- Qualifier
- with the drought resistance of the cultivare1
- Comparator
- well watered (control) conditione1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e1“The contents of Put, Spd and Spm in the leaf were decreased with the senescence of the leaf and were not correlated with the drought resistance of the cultivar under the well watered (control) condition”
Claim · model-written summary
Put, Spd and Spm contents were significantly increased under water deficit stress compared with well-watered control.
- Taxon
- riceOryza sativae0
- Treatment
- water deficit stresse2
- Outcome
- contents of Put, Spd and Spme1
- Direction
- increasede2
- Qualifier
- the increment trend was PutSpdSpme2
- Comparator
- well watered (control) conditione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e1“The contents of Put, Spd and Spm in the leaf were decreased with the senescence of the leaf and were not correlated with the drought resistance of the cultivar under the well watered (control) condition”
e2“They were significantly increased under the water deficit stress (WS, soil water potential was kept at -0.05 MPa), and the increment trend was PutSpdSpm”
Claim · model-written summary
Polyamines in the leaf accumulated earlier and for a longer time under water deficit (WS).
- Taxon
- riceOryza sativae0
- Organ / stage
- leafe3
- Outcome
- accumulated earlier and for a linger timee3
- Qualifier
- under WSe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e3“The polyamines in the leaf were accumulated earlier and for a linger time under WS”
Claim · model-written summary
Relative contents of Spd and Spm under WS were greater in drought resistant cultivars than in drought sensitive ones.
- Taxon
- riceOryza sativae0
- Material
- drought resistant cultivarse4
- Outcome
- relative contents (WS/control) of Spd and Spme4
- Direction
- greatere4
- Comparator
- drought sensitive onese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e4“the relative contents (WS/control) of Spd and Spm were greater for drought resistant cultivars than for drought sensitive ones”
Claim · model-written summary
Leaf water potential threshold for Put and Spd accumulation in drought resistant cultivars was -0.50 to -0.53 MPa.
- Taxon
- riceOryza sativae0
- Material
- drought resistant cultivarse5
- Outcome
- leaf water potential thresholdse5
- Value
- (-0 50)-(-0 53) MPae5
- Qualifier
- at the beginning of the accumulation of Put and Spde5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e5“The leaf water potential thresholds at the beginning of the accumulation of Put and Spd or Spm were (-0 50)-(-0 53) MPa and (-0 61)-(-0 62) MPa respectively for drought resistant cultivars and (-0 72)-(-0 74) MPa and (-0 81)-(-0 83) MPa respectively for drought sensitive ones”
Claim · model-written summary
Leaf water potential threshold for Spd or Spm accumulation in drought resistant cultivars was -0.61 to -0.62 MPa.
- Taxon
- riceOryza sativae0
- Material
- drought resistant cultivarse5
- Outcome
- leaf water potential thresholdse5
- Value
- (-0 61)-(-0 62) MPae5
- Qualifier
- at the beginning of the accumulation of Put and Spd or Spme5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e5“The leaf water potential thresholds at the beginning of the accumulation of Put and Spd or Spm were (-0 50)-(-0 53) MPa and (-0 61)-(-0 62) MPa respectively for drought resistant cultivars and (-0 72)-(-0 74) MPa and (-0 81)-(-0 83) MPa respectively for drought sensitive ones”
Claim · model-written summary
Leaf water potential threshold for Put and Spd accumulation in drought sensitive ones was -0.72 to -0.74 MPa.
- Taxon
- riceOryza sativae0
- Material
- drought sensitive onese5
- Outcome
- leaf water potential thresholdse5
- Value
- (-0 72)-(-0 74) MPae5
- Qualifier
- at the beginning of the accumulation of Put and Spde5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e5“The leaf water potential thresholds at the beginning of the accumulation of Put and Spd or Spm were (-0 50)-(-0 53) MPa and (-0 61)-(-0 62) MPa respectively for drought resistant cultivars and (-0 72)-(-0 74) MPa and (-0 81)-(-0 83) MPa respectively for drought sensitive ones”
Claim · model-written summary
Leaf water potential threshold for Spd or Spm accumulation in drought sensitive ones was -0.81 to -0.83 MPa.
- Taxon
- riceOryza sativae0
- Material
- drought sensitive onese5
- Outcome
- leaf water potential thresholdse5
- Value
- (-0 81)-(-0 83) MPae5
- Qualifier
- at the beginning of the accumulation of Put and Spd or Spme5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e5“The leaf water potential thresholds at the beginning of the accumulation of Put and Spd or Spm were (-0 50)-(-0 53) MPa and (-0 61)-(-0 62) MPa respectively for drought resistant cultivars and (-0 72)-(-0 74) MPa and (-0 81)-(-0 83) MPa respectively for drought sensitive ones”
Claim · model-written summary
Relative contents of Spd and Spm were positively and very significantly correlated with drought resistance coefficients of cultivars.
- Taxon
- riceOryza sativae0
- Material
- cultivarse6
- Outcome
- relative contents of Spd and Spme6
- Direction
- positivelye6
- Value
- r =0 921 ** -0 984 **e6
- Qualifier
- P 0 01e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e6“The relative contents of Spd and Spm were positively and very significantly correlated with drought resistant coefficients of cultivars ( r =0 921 ** -0 984 ** , P 0 01)”
Claim · model-written summary
The correlation between the relative content of Put and drought resistance coefficients varied with determination stages.
- Taxon
- riceOryza sativae0
- Organ / stage
- determination stagese7
- Outcome
- correlation between the relative content of Put and drought resistant coefficientse7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e7“the correlation between the relative content of Put and drought resistant coefficients varied with determination stages”
Claim · model-written summary
Spraying leaves with 0.1 mmol/L Spd or Spm significantly increased grain yield at the start of water deficit.
- Taxon
- riceOryza sativae0
- Treatment
- 0 1 mmol/L Spd or Spme1
- Outcome
- grain yielde1
- Direction
- increasede1
- Qualifier
- at the initial of WSe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e1“The grain yield was significantly increased when leaves were sprayed with 0 1 mmol/L Spd or Spm at the initial of WS”
Claim · model-written summary
Spraying with 0.2 mmol/L Put did not affect grain yield.
- Taxon
- riceOryza sativae0
- Treatment
- 0 2 mmol/L Pute1
- Outcome
- grain yielde2
- Direction
- not affectede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e1“It was not affected by the treatment of 0 2 mmol/L Put”
e2“The grain yield was significantly increased when leaves were sprayed with 0 1 mmol/L Spd or Spm at the initial of WS”
Claim · model-written summary
Treatment with 1 mmol/L MGBG significantly decreased grain yield.
- Taxon
- riceOryza sativae0
- Treatment
- 1 mmol/L MGBGe1
- Outcome
- grain yielde1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e1“the grain yield was significantly decreased by treated leaves with 1 mmol/L MGBG”
Claim · model-written summary
Changes of polyamines in the flag leaf under water deficit are closely associated with drought resistance of cultivars.
- Taxon
- riceOryza sativae0
- Organ / stage
- flag leafe1
- Outcome
- drought resistance of cultivarse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e1“The results suggest that the changes of polyamines in the flag leaf under WS are closely associated with drought resistance of cultivars”
Claim · model-written summary
Earlier and longer polyamine accumulation in the leaf under water deficit, and greater relative Spd and Spm contents, are important physiological characters of drought-resistant rice.
- Taxon
- riceOryza sativae0
- Outcome
- important physiological characters for a drought resistant rice cultivare1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“six mid maturing lowland and upland rice cultivars”
e1“Earlier and longer duration of polyamines accumulation in the leaf under WS and greater relative contents of Spd and Spm are the important physiological characters for a drought resistant rice cultivar”
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See all 14 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.