Abstract
Cold acclimation process plays a vital role in the survival of chilling- and freezing-tolerant plants subjected to cold temperature stress. However, it remains elusive whether a cold acclimation process enhances root water uptake (a component of chilling tolerance) in chilling-sensitive crops such as rice. By analyzing the root hydraulic conductivity under cold stress for a prolonged time, we found that cold stress induced a gradual increase in root osmotic hydraulic conductivity [Lp(r(os))]. Compared with the control treatment (roots and shoots at 25°C), low root temperature (LRT) treatment (roots at 10°C; shoots at 25°C) dramatically reduced Lp(r(os)) within 1 h. However, Lp(r(os)) gradually increased during prolonged LRT treatment and it reached 10-fold higher values at day 5. Moreover, a coordinated up-regulation of root aquaporin gene expression, particularly OsPIP2;5, was observed during LRT treatment. Further, comparison of aquaporin gene expression under root-only chilling (LRT) and whole-plant chilling conditions, and in the roots of intact plants vs. shootless plants, suggests that a shoot to root signal is necessary for inducing the expression of aquaporin genes in the root. Collectively, these results demonstrate that a cold acclimation process for root water uptake functions in rice and is possibly regulated through aquaporins.
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Claims 5
Claim · model-written summary
Cold stress gradually increased root osmotic hydraulic conductivity.
- Taxon
- Rice
Oryza sativat0 - Treatment
- cold stresse0
- Outcome
- root osmotic hydraulic conductivity [Lp(r(os))]e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cold stress induced a gradual increase in root osmotic hydraulic conductivity [Lp(r(os))]”
t0“Rice”
Claim · model-written summary
Low root temperature initially reduced root osmotic hydraulic conductivity relative to 25°C control.
- Taxon
- RiceOryza sativat0
- Treatment
- low root temperature (LRT) treatment (roots at 10°C; shoots at 25°C)e0
- Outcome
- Lp(r(os))e0
- Direction
- reducede0
- Qualifier
- within 1 he0
- Comparator
- control treatment (roots and shoots at 25°C)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the control treatment (roots and shoots at 25°C), low root temperature (LRT) treatment (roots at 10°C; shoots at 25°C) dramatically reduced Lp(r(os)) within 1 h”
t0“Rice”
Claim · model-written summary
During prolonged LRT, root conductivity increased to tenfold higher by day 5.
- Taxon
- RiceOryza sativat0
- Treatment
- prolonged LRT treatmente0
- Outcome
- Lp(r(os))e0
- Direction
- increasede0
- Value
- 10-folde0
- Qualifier
- at day 5e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lp(r(os)) gradually increased during prolonged LRT treatment and it reached 10-fold higher values at day 5”
t0“Rice”
Claim · model-written summary
Root aquaporin expression, especially OsPIP2;5, was upregulated during LRT.
- Taxon
- RiceOryza sativat0
- Treatment
- LRT treatmente0
- Gene
- OsPIP2;5e0
- Outcome
- root aquaporin gene expressione0
- Direction
- up-regulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a coordinated up-regulation of root aquaporin gene expression, particularly OsPIP2;5, was observed during LRT treatment”
t0“Rice”
Claim · model-written summary
Comparisons of root-only, whole-plant, intact, and shootless chilling suggest a shoot-to-root signal is needed for root aquaporin induction.
- Taxon
- RiceOryza sativat0
- Outcome
- expression of aquaporin genes in the roote0
- Qualifier
- a shoot to root signal is necessarye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“comparison of aquaporin gene expression under root-only chilling (LRT) and whole-plant chilling conditions, and in the roots of intact plants vs. shootless plants, suggests that a shoot to root signal is necessary for inducing the expression of aquaporin genes in the root”
t0“Rice”
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cold · soil: physics · Oryza sativa (rice)Positive and negative results
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