Abstract
Improvement of photosynthesis in non-foliar green tissues is beneficial for enhancing crop yield. Recently, we have demonstrated that panicle stomatal conductance is a major limiting factor for photosynthesis. However, mechanisms underlying the responses of panicle stomatal conductance (gs,panicle) and photosynthesis (Apanicle) to environmental stimuli remain unknown. In the present study, the responses of gs,panicle and leaf stomatal conductance (gs,leaf) to exogenous application of abscisic acid and step-changes in vapor pressure deficit were investigated at the anthesis stage in pot-grown rice plants. Furthermore, the effects of drought on Apanicle and leaf photosynthesis (Aleaf) were examined. Smearing and xylem feeding of abscisic acid significantly decreased gs,leaf. In contrast, while smearing of abscisic acid substantially increased gs,panicle, its xylem feeding dramatically decreased gs,panicle. In addition, both gs,leaf and gs,panicle effectively responded to step changes in vapor pressure deficit. Furthermore, both Aleaf and Apanicle were sensitive to plant dehydration; however, given the lower sensitivity of panicle water potential than leaf water potential to drought, Apanicle was less sensitive to soil drought than Aleaf. These findings indicate that gs,panicle is hydropassively regulated, while panicle photosynthesis is less sensitive to drought.
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Claims 9
Claim · model-written summary
ABA smearing reduced leaf stomatal conductance.
- Taxon
- rice
Oryza sativat0 - Treatment
- Smearing and xylem feeding of abscisic acide0
- Outcome
- gs,leafe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Smearing and xylem feeding of abscisic acid significantly decreased gs,leaf”
t0“rice leaves”
Claim · model-written summary
Xylem feeding ABA reduced leaf stomatal conductance.
- Taxon
- riceOryza sativat0
- Treatment
- xylem feeding of abscisic acide0
- Outcome
- gs,leafe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Smearing and xylem feeding of abscisic acid significantly decreased gs,leaf”
t0“rice leaves”
Claim · model-written summary
ABA smearing increased panicle stomatal conductance.
- Taxon
- riceOryza sativat0
- Treatment
- smearing of abscisic acide0
- Outcome
- gs,paniclee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“smearing of abscisic acid substantially increased gs,panicle”
t0“rice leaves”
Claim · model-written summary
Xylem feeding ABA decreased panicle stomatal conductance.
- Taxon
- riceOryza sativat0
- Treatment
- xylem feedinge0
- Outcome
- gs,paniclee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its xylem feeding dramatically decreased gs,panicle”
t0“rice leaves”
Claim · model-written summary
Leaf and panicle stomatal conductance responded to vapor pressure deficit changes.
- Taxon
- riceOryza sativat0
- Treatment
- step changes in vapor pressure deficite0
- Outcome
- gs,leaf and gs,paniclee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both gs,leaf and gs,panicle effectively responded to step changes in vapor pressure deficit”
t0“rice leaves”
Claim · model-written summary
Leaf and panicle photosynthesis were sensitive to dehydration.
- Taxon
- riceOryza sativat0
- Treatment
- plant dehydratione0
- Outcome
- Aleaf and Apaniclee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both Aleaf and Apanicle were sensitive to plant dehydration”
t0“rice leaves”
Claim · model-written summary
Panicle water potential was less drought-sensitive than leaf water potential.
- Taxon
- riceOryza sativat0
- Outcome
- panicle water potentiale0
- Direction
- lowere0
- Comparator
- leaf water potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower sensitivity of panicle water potential than leaf water potential to drought”
t0“rice leaves”
Claim · model-written summary
Panicle photosynthesis was less sensitive to soil drought than leaf photosynthesis.
- Taxon
- riceOryza sativat0
- Outcome
- Apaniclee0
- Direction
- less sensitivee0
- Comparator
- Aleafe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apanicle was less sensitive to soil drought than Aleaf”
t0“rice leaves”
Claim · model-written summary
Authors infer hydropassive regulation of panicle stomatal conductance.
- Taxon
- riceOryza sativat0
- Outcome
- gs,paniclee0
- Qualifier
- hydropassively regulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“gs,panicle is hydropassively regulated”
t0“rice leaves”
The same questions in other papers
infection · physiology: gas exchange · Oryza sativa (rice)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.