Abstract
The effects of low air humidity and low root temperature (LRT) on water uptake, growth and aquaporin gene expression were investigated in rice plants. The daily transpiration of the plants grown at low humidity was 1.5- to 2-fold higher than that at high humidity. LRT at 13°C reduced transpiration, and the extent was larger at lower humidity. LRT also reduced total dry matter production and leaf area expansion, and the extent was again larger at lower humidity. These observations suggest that the suppression of plant growth by LRT is associated with water stress due to decreased water uptake ability of the root. On the other hand, the net assimilation rate was not affected by low humidity and LRT, and water use efficiency was larger for LRT. We found that low humidity induced coordinated up-regulation of many PIP and TIP aquaporin genes in both the leaves and the roots. Expression levels of two root-specific aquaporin genes, OsPIP2;4 and OsPIP2;5, were increased significantly after 6 and 13 d of LRT exposure. Taken together, we discuss the possibility that aquaporins are part of an integrated response of this crop to low air humidity and LRT.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Low humidity raised daily transpiration 1.5- to 2-fold over high humidity.
- Taxon
- rice plants
Oryza sativat0 - Treatment
- low humiditye0
- Outcome
- daily transpiratione0
- Direction
- highere0
- Value
- 1.5- to 2-folde0
- Comparator
- high humiditye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“daily transpiration of the plants grown at low humidity was 1.5- to 2-fold higher than that at high humidity”
t0“Rice Plants”
Claim · model-written summary
LRT at 13°C reduced transpiration more strongly at lower humidity.
- Taxon
- rice plantsOryza sativat0
- Treatment
- LRT at 13°Ce0
- Outcome
- transpiratione0
- Direction
- reducede0
- Qualifier
- larger at lower humiditye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“LRT at 13°C reduced transpiration, and the extent was larger at lower humidity”
t0“Rice Plants”
Claim · model-written summary
LRT reduced dry matter production and leaf area expansion, especially at lower humidity.
- Taxon
- rice plantsOryza sativat0
- Treatment
- LRTe0
- Outcome
- total dry matter production and leaf area expansione0
- Direction
- reducede0
- Qualifier
- larger at lower humiditye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“LRT also reduced total dry matter production and leaf area expansion, and the extent was again larger at lower humidity”
t0“Rice Plants”
Claim · model-written summary
The authors associate LRT growth suppression with root water stress.
- Taxon
- rice plantsOryza sativat0
- Treatment
- LRTe0
- Outcome
- suppression of plant growthe0
- Qualifier
- water stress due to decreased water uptake ability of the roote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suppression of plant growth by LRT is associated with water stress due to decreased water uptake ability of the root”
t0“Rice Plants”
Claim · model-written summary
Low humidity and LRT did not affect net assimilation rate.
- Taxon
- rice plantsOryza sativat0
- Treatment
- low humidity and LRTe0
- Outcome
- net assimilation ratee0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“net assimilation rate was not affected by low humidity and LRT”
t0“Rice Plants”
Claim · model-written summary
LRT increased water use efficiency.
- Taxon
- rice plantsOryza sativat0
- Treatment
- LRTe0
- Outcome
- water use efficiencye0
- Direction
- largere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water use efficiency was larger for LRT”
t0“Rice Plants”
Claim · model-written summary
Low humidity upregulated many PIP and TIP aquaporin genes in leaves and roots.
- Taxon
- rice plantsOryza sativat0
- Organ / stage
- leaves and the rootse0
- Treatment
- low humiditye0
- Gene
- PIP and TIP aquaporin genese0
- Outcome
- PIP and TIP aquaporin genese0
- Direction
- up-regulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low humidity induced coordinated up-regulation of many PIP and TIP aquaporin genes in both the leaves and the roots”
t0“Rice Plants”
Claim · model-written summary
LRT significantly increased OsPIP2;4 and OsPIP2;5 expression after 6 and 13 days.
- Taxon
- rice plantsOryza sativat0
- Treatment
- LRT exposuree0
- Gene
- OsPIP2;4 and OsPIP2;5e0
- Outcome
- Expression levelse0
- Direction
- increasede0
- Qualifier
- after 6 and 13 de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Expression levels of two root-specific aquaporin genes, OsPIP2;4 and OsPIP2;5, were increased significantly after 6 and 13 d of LRT exposure”
t0“Rice Plants”
The same questions in other papers
humidity · molecular: expression · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
humidity · growth · Oryza sativa (rice)Positive and negative results
8 papers in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
10 papers more in this group
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.