Claim · model-written summary
Dehydration reduced wheat shoot ACC oxidase activity, already evident after 4–5 hours below about 3.0 g H 2 O g −1 DM moisture.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- Dehydratione0
- Outcome
- ACC oxidase activitye0
- Direction
- reducede0
- Qualifier
- at 4–5 h of dehydration, namely when shoot moisture content dropped down below about 3.0 g H 2 O g −1 DMe1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Dehydration induced changes in cell membrane properties since it reduced in vivo capacity of the shoot to convert 1‐aminocyclopropane 1‐carboxylic acid (ACC) to ethylene (i.e. ACC oxidase activity).”
e1“This effect was already observed at 4–5 h of dehydration, namely when shoot moisture content dropped down below about 3.0 g H 2 O g −1 DM”
Title
Françoise Corbineau; Patricia Berjak; Norman Pammenter; et al. Physiologia Plantarum 2004. doi:10.1111/j.1399-3054.2004.00351.x
Other claims from this paper (17)
- Intervention effect Young wheat seedlings remained viable after drying reduced shoot moisture to about 0.30 g H 2 O g −1 dry mass.
- Intervention effect Wheat coleoptile and primary leaf growth resumed on rehydration.
- Observation Wheat primary roots died and new roots regenerated.
- Observation Non-dehydrated wheat shoots had moisture content of 4.0–5.0 g H 2 O g −1 DM.
- Observation Non-dehydrated wheat shoots had active metabolism with EC of 0.85 and well-developed organelles.
- Observation Wheat ACC-dependent ethylene production became almost nil at shoot moisture of 1.0 g H 2 O g −1 DM.
- Intervention effect Dehydration decreased wheat ATP and NTP contents to 1–2% of initial values.
- Intervention effect Dehydration decreased wheat EC to 0.20.
- Intervention effect Wheat shoot sucrose increased to a maximum of about 330 mg g −1 DM after two days of drying, three times non-dehydrated levels.
- Intervention effect Wheat shoots regained original moisture content within three days of rehydration and progressively recovered apparently normal metabolism.
- Intervention effect Wheat cell-wall folding reversed between two and three days of rehydration.
- Observation Rehydrating wheat coleoptile and primary leaf cells showed intensive autophagic activity indicative of damaged-component removal.
- Observation Apparently undamaged organelles and endomembranes persisted in wheat cytoplasm during recovery.
- Observation Wheat restored 60–70% of ACC oxidase activity within 48 hours.
- Observation Wheat restored 80–90% of EC value within 18 hours.
- Observation Wheat ATP/ADP and NTP/ATP ratios remained below non-dehydrated controls, indicating incomplete metabolic repair.
- Mechanism Wheat shoot desiccation tolerance was suggested to involve maintaining cell structure during water loss and repairing dehydration damage.