Abstract
Abstract A few rice cultivars with super high‐yielding potential have successfully been released. However, little is known about the physiological mechanisms underlying the formation of super high yield in rice. Here, we report changes of cytokinin (zeatin + zeatin riboside, ZR) and abscisic acid (ABA) contents in roots and leaves during grain filling and their relation to declining photosynthesis function of leaves in super high‐yielding rice cv. Xieyou 9308 and standard rice cv. Shanyou 63, as a control. ZR contents in roots and leaves decreased in a time‐dependent manner, while their ABA contents were relatively stable at earlier grain filling stage and rapidly increased at later grain filling stage in both cultivars. A rapid decrease in ZR content and a rapid increase in ABA content were observed earlier in roots than in leaves for both cultivars. Declining instantaneous photosynthesis rate (IAPS) of leaves in both cultivars coincided with decreasing ZR contents and increasing ABA contents in both roots and leaves. Leaves with 6‐benzyl aminopurine (6‐BA) treatment exhibited increased IAPS and extended active photosynthesis duration (APD), and the result was reversed in leaves with ABA treatment. A rapid decrease in ZR contents and a rapid increase in ABA contents of roots and leaves in Xieyou 9308 obviously lagged behind those in Shanyou 63. These results suggest that decreased ZR content and increased ABA content in roots cause the decline of photosynthetic function during grain filling stage. The highly efficient photosynthetic function of Xieyou 9308 is due to the delayed change of ZR and ABA contents in its roots.
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Claims 13
Claim · model-written summary
Root and leaf ZR declined over grain filling in both cultivars.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- roots and leavese0
- Outcome
- ZR contentse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZR contents in roots and leaves decreased in a time‐dependent manner”
t0“Rice (Oryza sativa)”
Claim · model-written summary
Root and leaf ABA remained relatively stable early and rose rapidly later in grain filling.
- Taxon
- riceOryza sativat0
- Outcome
- ABA contentse0
- Direction
- rapidly increasede0
- Qualifier
- later grain filling stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“their ABA contents were relatively stable at earlier grain filling stage and rapidly increased at later grain filling stage in both cultivars”
t0“Rice (Oryza sativa)”
Claim · model-written summary
Rapid root ZR decline occurred earlier than leaf ZR decline.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A rapid decrease in ZR content and a rapid increase in ABA content were observed earlier in roots than in leaves for both cultivars”
t0“Rice (Oryza sativa)”
Claim · model-written summary
Rapid root ABA increase occurred earlier than leaf ABA increase.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A rapid decrease in ZR content and a rapid increase in ABA content were observed earlier in roots than in leaves for both cultivars”
t0“Rice (Oryza sativa)”
Claim · model-written summary
Declining leaf photosynthesis coincided with declining ZR in roots and leaves.
- Taxon
- riceOryza sativat0
- Organ / stage
- leavese0
- Compound
- ZRe0
- Outcome
- instantaneous photosynthesis rate (IAPS)e0
- Direction
- Declininge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Declining instantaneous photosynthesis rate (IAPS) of leaves in both cultivars coincided with decreasing ZR contents and increasing ABA contents in both roots and leaves”
t0“Rice (Oryza sativa)”
Claim · model-written summary
Declining leaf photosynthesis coincided with increasing ABA in roots and leaves.
- Taxon
- riceOryza sativat0
- Organ / stage
- leavese0
- Compound
- ABAe0
- Outcome
- instantaneous photosynthesis rate (IAPS)e0
- Direction
- Declininge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Declining instantaneous photosynthesis rate (IAPS) of leaves in both cultivars coincided with decreasing ZR contents and increasing ABA contents in both roots and leaves”
t0“Rice (Oryza sativa)”
Claim · model-written summary
6-BA treatment increased leaf photosynthesis rate and extended active photosynthesis.
- Taxon
- riceOryza sativat0
- Treatment
- 6‐benzyl aminopurine (6‐BA) treatmente0
- Outcome
- IAPS and extended active photosynthesis duration (APD)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves with 6‐benzyl aminopurine (6‐BA) treatment exhibited increased IAPS and extended active photosynthesis duration (APD)”
t0“Rice (Oryza sativa)”
Claim · model-written summary
ABA treatment reversed the 6-BA photosynthetic response.
- Taxon
- riceOryza sativat0
- Treatment
- ABA treatmente0
- Outcome
- resulte0
- Direction
- reversede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and the result was reversed in leaves with ABA treatment”
t0“Rice (Oryza sativa)”
Claim · model-written summary
Root and leaf ZR decline in Xieyou 9308 lagged behind Shanyou 63.
- Taxon
- riceOryza sativat0
- Material
- Xieyou 9308e0
- Outcome
- ZR contentse0
- Direction
- lagged behinde0
- Comparator
- Shanyou 63e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A rapid decrease in ZR contents and a rapid increase in ABA contents of roots and leaves in Xieyou 9308 obviously lagged behind those in Shanyou 63”
t0“Rice (Oryza sativa)”
Claim · model-written summary
Root and leaf ABA increase in Xieyou 9308 lagged behind Shanyou 63.
- Taxon
- riceOryza sativat0
- Material
- Xieyou 9308e0
- Outcome
- ABA contentse0
- Direction
- lagged behinde0
- Comparator
- Shanyou 63e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A rapid decrease in ZR contents and a rapid increase in ABA contents of roots and leaves in Xieyou 9308 obviously lagged behind those in Shanyou 63”
t0“Rice (Oryza sativa)”
Claim · model-written summary
The authors attribute photosynthetic decline to decreased root ZR.
- Taxon
- riceOryza sativat0
- Organ / stage
- rootse0
- Compound
- ZRe0
- Outcome
- decline of photosynthetic functione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased ZR content and increased ABA content in roots cause the decline of photosynthetic function during grain filling stage”
t0“Rice (Oryza sativa)”
Claim · model-written summary
The authors attribute photosynthetic decline to increased root ABA.
- Taxon
- riceOryza sativat0
- Organ / stage
- rootse0
- Compound
- ABAe0
- Outcome
- decline of photosynthetic functione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased ZR content and increased ABA content in roots cause the decline of photosynthetic function during grain filling stage”
t0“Rice (Oryza sativa)”
Claim · model-written summary
The authors attribute efficient photosynthesis in Xieyou 9308 to delayed root ZR and ABA changes.
- Taxon
- riceOryza sativat0
- Material
- Xieyou 9308e0
- Compound
- ZR and ABAe0
- Outcome
- highly efficient photosynthetic functione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highly efficient photosynthetic function of Xieyou 9308 is due to the delayed change of ZR and ABA contents in its roots”
t0“Rice (Oryza sativa)”
The same questions in other papers
N-benzyladenine · physiology: photosynthesis · Oryza sativa (rice)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.