Abstract
Hypoxic pretreatment is known to induce anoxia tolerance in plant species sensitive to oxygen deprivation. However, we still do not have detailed information on changes in cytoplasmic and vacuolar pH (pH cyt and pH vac ) in plants under low‐oxygen availability (hypoxia) and under anoxia. To investigate this, we have studied the influence of hypoxia and anoxia on pH cyt and pH vac , glucose‐6‐phosphate (Glc‐6‐P) and nucleotide triphosphate (NTP) contents in rice ( Oryza sativa L.) root tips in comparison with those of wheat ( Triticum aestivum L.) with in vivo 31 P‐nuclear magnetic resonance. Both cereals responded to hypoxia similarly, by rapid cytoplasmic acidification (from pH 7.6–7.7 to 7.1), which was followed by slow partial recovery (0.3 units after 6 h). Anoxia led to a dramatic pH cyt drop in tissues of both species (from pH 7.6–7.7 to less than 7.0) and partial recovery took place in rice only. In wheat, the acidification continued to pH 6.8 after 6 h of exposure. In both plants, NTP content followed the dynamics of pH cyt . There was a strong correlation between NTP content and cytoplasmic H + activity ([H + ] cyt = 10 −pHcyt ) for both hypoxic and anoxic conditions. Glc‐6‐P content increased in rice under anoxia and hypoxia. In wheat, Glc‐6‐P was not detectable under anoxia but increased under hypoxia. In this study, rice root tips were shown to behave as anoxia tolerant tissues. Our results suggest that the initial cytoplasmic acidification and subsequent pH cyt are differently regulated in anoxia tolerant and intolerant plants and depend on the external oxygen concentration.
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Claims 11
Claim · model-written summary
Hypoxia caused rapid cytoplasmic acidification in rice root tips.
- Taxon
- rice
Oryza sativat0 - Treatment
- hypoxiae0
- Outcome
- cytoplasmic acidificatione0
- Direction
- acidificatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice (Oryza sativa)”
e0“Both cereals responded to hypoxia similarly, by rapid cytoplasmic acidification (from pH 7.6–7.7 to 7.1)”
Claim · model-written summary
Hypoxia caused rapid cytoplasmic acidification in wheat root tips.
- Taxon
- wheat
Triticum aestivumt1 - Treatment
- hypoxiae0
- Outcome
- cytoplasmic acidificatione0
- Direction
- acidificatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“wheat (Triticum aestivum)”
e0“Both cereals responded to hypoxia similarly, by rapid cytoplasmic acidification (from pH 7.6–7.7 to 7.1)”
Claim · model-written summary
Anoxia caused a dramatic drop in cytoplasmic pH in rice root tips.
- Taxon
- riceOryza sativat0
- Treatment
- Anoxiae1
- Outcome
- pH cyte1
- Direction
- drope1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice (Oryza sativa)”
e1“Anoxia led to a dramatic pH cyt drop in tissues of both species (from pH 7.6–7.7 to less than 7.0) and partial recovery took place in rice only”
Claim · model-written summary
Under anoxia, the cytoplasmic acidification in wheat root tips continued to pH 6.8 after 6 h.
- Taxon
- wheatTriticum aestivumt1
- Treatment
- Anoxiae1
- Outcome
- acidificatione2
- Direction
- continuede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“wheat (Triticum aestivum)”
e1“Anoxia led to a dramatic pH cyt drop in tissues of both species (from pH 7.6–7.7 to less than 7.0) and partial recovery took place in rice only”
e2“In wheat, the acidification continued to pH 6.8 after 6 h of exposure”
Claim · model-written summary
Under anoxia, cytoplasmic pH partially recovered in rice root tips but not in wheat.
- Taxon
- riceOryza sativat0
- Treatment
- Anoxiae1
- Outcome
- pH cyte1
- Direction
- partial recoverye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice (Oryza sativa)”
e1“Anoxia led to a dramatic pH cyt drop in tissues of both species (from pH 7.6–7.7 to less than 7.0) and partial recovery took place in rice only”
Claim · model-written summary
In rice root tips, NTP content followed cytoplasmic pH dynamics and correlated strongly with cytoplasmic H+ activity.
- Taxon
- riceOryza sativat0
- Treatment
- hypoxic and anoxic conditionse4
- Outcome
- NTP contente3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice (Oryza sativa)”
e3“In both plants, NTP content followed the dynamics of pH cyt”
e4“There was a strong correlation between NTP content and cytoplasmic H + activity ([H + ] cyt = 10 −pHcyt ) for both hypoxic and anoxic conditions”
Claim · model-written summary
In wheat root tips, NTP content followed cytoplasmic pH dynamics and correlated strongly with cytoplasmic H+ activity.
- Taxon
- wheatTriticum aestivumt1
- Treatment
- hypoxic and anoxic conditionse4
- Outcome
- NTP contente3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“wheat (Triticum aestivum)”
e3“In both plants, NTP content followed the dynamics of pH cyt”
e4“There was a strong correlation between NTP content and cytoplasmic H + activity ([H + ] cyt = 10 −pHcyt ) for both hypoxic and anoxic conditions”
Claim · model-written summary
Glc-6-P content increased in rice root tips under anoxia and hypoxia.
- Taxon
- riceOryza sativat0
- Treatment
- anoxia and hypoxiae5
- Outcome
- Glc‐6‐P contente5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice (Oryza sativa)”
e5“Glc‐6‐P content increased in rice under anoxia and hypoxia”
Claim · model-written summary
Glc-6-P increased in wheat root tips under hypoxia.
- Taxon
- wheatTriticum aestivumt1
- Treatment
- hypoxiae6
- Outcome
- Glc‐6‐Pe6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“wheat (Triticum aestivum)”
e6“In wheat, Glc‐6‐P was not detectable under anoxia but increased under hypoxia”
Claim · model-written summary
Glc-6-P was not detectable in wheat root tips under anoxia.
- Taxon
- wheatTriticum aestivumt1
- Outcome
- Glc‐6‐Pe6
- Qualifier
- not detectable under anoxiae6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“wheat (Triticum aestivum)”
e6“In wheat, Glc‐6‐P was not detectable under anoxia but increased under hypoxia”
Claim · model-written summary
Rice root tips behaved as anoxia-tolerant tissues.
- Taxon
- riceOryza sativat0
- Organ / stage
- root tipse7
- Outcome
- anoxia tolerant tissuese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice (Oryza sativa)”
e7“rice root tips were shown to behave as anoxia tolerant tissues”
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