Abstract
Six rice cultivars (including 2 japonica/indica hybrid combinations and 1 new plant type line ) were grown in water culture in the green house /or in pots in the screen house. Zeatin (Z) and Zeatin riboside (ZR) contents in grains and roots during grain filling were measured with an enzyme-linked immunosorbent assay (ELISA), and the relationship to the grain filling were examined. Z +ZR content in grains was rather low at initial filling stage, and quickly increased with the filling process , and reached the peak at 9-15 days after flowering (DAF) for superior grains and 12- 21 DAF for inferior ones, and sharply decreased thereafter. Z +ZR content in roots was rather high at heading, and reached the peak at 3-9 DAF. Z+ZR content in grains and roots, and the time reached the peak were associated with grain filling patterns of the cultivars. The cultivar with good grain plumpness and high grain filling rate had high Z+ZR content in grains and roots at early filling stage (3-12 DAF), and early reached the peak. Z+ ZR content in grains and roots at early filling stage, the maximum content, and the mean content in whole filling period significantly or very significantly correlated with Fertilized grainfilling percentage (FGFP), grain weight, the maximum filling rate, and with mean filling rate. Z+ZR content in grains and roots, FGFP and grain weight were obviously decreased when roots were treated with NaN3 at heading, and the result was reversed when roots with 10-6mol/L zeatin. The results suggested that the grain filling pattern may be determined by the changing pattern of cytokinins (Z + ZR) in the grains and roots, and it is an effective approach to improving grain filling by regulating cytokinin levels in the grains and roots during grain filling, especially at early filling stage.
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Claims 10
Claim · model-written summary
Grain Z +ZR rose then peaked at 9-15 DAF in superior grains and declined thereafter.
- Taxon
- Rice
Oryza sativat0 - Organ / stage
- superior grainse0
- Outcome
- Z +ZR content in grainse0
- Direction
- increasede0
- Value
- 9-15 days after flowering (DAF)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Z +ZR content in grains was rather low at initial filling stage, and quickly increased with the filling process , and reached the peak at 9-15 days after flowering (DAF) for superior grains and 12- 21 DAF for inferior ones, and sharply decreased thereafter.”
t0“Rice”
Claim · model-written summary
Inferior grain Z +ZR peaked at 12-21 DAF.
- Taxon
- RiceOryza sativat0
- Organ / stage
- inferior onese0
- Outcome
- Z +ZR content in grainse0
- Direction
- peake0
- Value
- 12- 21 DAFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Z +ZR content in grains was rather low at initial filling stage, and quickly increased with the filling process , and reached the peak at 9-15 days after flowering (DAF) for superior grains and 12- 21 DAF for inferior ones, and sharply decreased thereafter.”
t0“Rice”
Claim · model-written summary
Root Z +ZR peaked at 3-9 DAF.
- Taxon
- RiceOryza sativat0
- Outcome
- Z +ZR content in rootse0
- Direction
- peake0
- Value
- 3-9 DAFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Z +ZR content in roots was rather high at heading, and reached the peak at 3-9 DAF.”
t0“Rice”
Claim · model-written summary
Grain and root cytokinin content and peak timing were associated with cultivar grain filling patterns.
- Taxon
- RiceOryza sativat0
- Organ / stage
- grains and rootse0
- Compound
- Z+ZRe0
- Outcome
- grain filling patternse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Z+ZR content in grains and roots, and the time reached the peak were associated with grain filling patterns of the cultivars.”
t0“Rice”
Claim · model-written summary
Cultivars with good plumpness and high filling rate had high early Z+ZR and early peaks.
- Taxon
- RiceOryza sativat0
- Organ / stage
- early filling stagee0
- Outcome
- Z+ZR content in grains and rootse0
- Direction
- highe0
- Qualifier
- good grain plumpness and high grain filling ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cultivar with good grain plumpness and high grain filling rate had high Z+ZR content in grains and roots at early filling stage (3-12 DAF), and early reached the peak.”
t0“Rice”
Claim · model-written summary
Early, maximum and mean Z+ZR content correlated with filling percentage, grain weight and filling rates.
- Taxon
- RiceOryza sativat0
- Organ / stage
- grains and rootse0
- Compound
- Z+ ZRe0
- Outcome
- Fertilized grainfilling percentage (FGFP), grain weight, the maximum filling rate, and with mean filling ratee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Z+ ZR content in grains and roots at early filling stage, the maximum content, and the mean content in whole filling period significantly or very significantly correlated with Fertilized grainfilling percentage (FGFP), grain weight, the maximum filling rate, and with mean filling rate.”
t0“Rice”
Claim · model-written summary
NaN3 treatment decreased grain and root Z+ZR content, filling percentage and grain weight.
- Taxon
- RiceOryza sativat0
- Treatment
- roots were treated with NaN3 at headinge0
- Outcome
- Z+ZR content in grains and roots, FGFP and grain weighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Z+ZR content in grains and roots, FGFP and grain weight were obviously decreased when roots were treated with NaN3 at heading”
t0“Rice”
Claim · model-written summary
Zeatin root treatment reversed the NaN3-associated decreases.
- Taxon
- RiceOryza sativat0
- Treatment
- 10-6mol/L zeatine0
- Outcome
- Z+ZR content in grains and roots, FGFP and grain weighte1
- Direction
- reversede0
- Comparator
- NaN3e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the result was reversed when roots with 10-6mol/L zeatin”
e1“Z+ZR content in grains and roots, FGFP and grain weight were obviously decreased when roots were treated with NaN3 at heading”
t0“Rice”
Claim · model-written summary
Authors suggest cytokinin changes may determine the grain filling pattern.
- Taxon
- RiceOryza sativat0
- Compound
- cytokinins (Z + ZR)e0
- Outcome
- grain filling patterne0
- Qualifier
- changing patterne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results suggested that the grain filling pattern may be determined by the changing pattern of cytokinins (Z + ZR) in the grains and roots”
t0“Rice”
Claim · model-written summary
Authors recommend regulating cytokinin levels during grain filling, especially early.
- Taxon
- RiceOryza sativat0
- Outcome
- improving grain filling by regulating cytokinin levelse0
- Qualifier
- especially at early filling stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is an effective approach to improving grain filling by regulating cytokinin levels in the grains and roots during grain filling, especially at early filling stage”
t0“Rice”
The same questions in other papers
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2 papers in the same direction as this paper · 1 in the opposite direction
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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.