Abstract
Abstract: Rapid wilting and subsequent rapid recovery of the shoots of plants whose roots are cooled and rewarmed (first described by Sachs, 1860 [23] ), has been investigated by cryo‐scanning electron microscopy. Squash plants began to wilt within 5 min and were completely wilted 1 h after their roots were placed in nutrient solution at 4d̀C. Recovery began in 5 min and was complete by 45 min when the roots were returned to solution at 22d̀C. Some stomata on the abaxial leaf surface remained fully or partially open in the wilted plants and transpiration continued at a low level. Both control and wilted plants had the same proportion (60%) of large root vessels partially or totally gas‐filled, showing that the supply of water was not limited by the reduction of axial hydraulic conductance due to vessel embolism. However, only 10% of these embolized vessels in the wilted plants contained any liquid, compared to ≅ 80% of similar vessels in control and recovered plants. This is visual evidence of reduced radial hydraulic conductance into the vessels in the cold roots, and that this reduced conductance, together with still open‐stomata, produces wilting. These effects were reversed by rewarming.
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Claims 7
Claim · model-written summary
Squash wilted within five minutes of root cooling and completely within one hour.
Not reportedComparatorDirection
Verbatim
e0“Squash plants”
e1“Squash plants began to wilt within 5 min and were completely wilted 1 h after their roots were placed in nutrient solution at 4d̀C.”
Claim · model-written summary
Rewarming began recovery within five minutes and completed it by 45 minutes.
Not reportedComparatorDirection
Verbatim
e0“Squash plants”
e1“Recovery began in 5 min and was complete by 45 min when the roots were returned to solution at 22d̀C.”
Claim · model-written summary
Some abaxial stomata remained open during wilting and transpiration continued at a low level.
Verbatim
e0“Squash plants”
e1“Some stomata on the abaxial leaf surface remained fully or partially open in the wilted plants and transpiration continued at a low level.”
Claim · model-written summary
Control and wilted plants had the same 60% proportion of gas-filled large root vessels.
Verbatim
e0“Squash plants”
e1“Both control and wilted plants had the same proportion (60%) of large root vessels partially or totally gas‐filled”
Claim · model-written summary
Only 10% of embolized vessels contained liquid in wilted plants versus about 80% in controls and recovered plants.
Verbatim
e0“Squash plants”
e1“only 10% of these embolized vessels in the wilted plants contained any liquid, compared to ≅ 80% of similar vessels in control and recovered plants”
Claim · model-written summary
Reduced radial hydraulic conductance and open stomata were interpreted as causing cooling induced wilting.
Verbatim
e0“Squash plants”
e1“reduced radial hydraulic conductance into the vessels in the cold roots, and that this reduced conductance, together with still open‐stomata, produces wilting”
Claim · model-written summary
Rewarming reversed the cooling effects.
Verbatim
e0“Squash plants”
e1“These effects were reversed by rewarming.”
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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.