Abstract
Specific features of low-temperature hardening (6 days at 8°C) of cold-sensitive tobacco plants ( Nicotiana tabacum , cv. Samsun) related to changes in the cell-wall invertase activity were studied. During cold hardening, oppositely directed changes in this enzyme activity occurred in tobacco leaves and roots. In the leaves, cell-wall invertase was activated (approximately by 30%), the content of sugars increased (approximately by 25%), and the content of sucrose, the main transport form of sugars, in the apoplast reduced by three times; all these changes indicate that assimilate outflow from leaves to roots was inhibited. In contrast, in the root system, enzyme activity was decreased almost twice and the content of sugars in them was essentially unchanged. It is suggested that a strategy of low-temperature adaptation of cold-sensitive tobacco plants aimed at creating the high cold tolerance of aboveground parts, even at the expense of the root system, which, under conditions of native vegetation, is not practically exposed to damaging low temperatures.
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Claims 6
Claim · model-written summary
Leaf cell-wall invertase activity rose approximately 30% during hardening.
- Taxon
- tobacco plants
Nicotiana tabacume1 - Organ / stage
- leavese0
- Treatment
- low-temperature hardening (6 days at 8°C)e1
- Gene
- cell-wall invertasee0
- Outcome
- cell-wall invertasee0
- Direction
- activatede0
- Value
- approximately by 30%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the leaves, cell-wall invertase was activated (approximately by 30%)”
e1“low-temperature hardening (6 days at 8°C) of cold-sensitive tobacco plants ( Nicotiana tabacum , cv. Samsun)”
Claim · model-written summary
Leaf sugar content rose approximately 25% during hardening.
- Taxon
- tobacco plantsNicotiana tabacume1
- Organ / stage
- leavese2
- Treatment
- low-temperature hardening (6 days at 8°C)e1
- Outcome
- content of sugarse0
- Direction
- increasede0
- Value
- approximately by 25%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of sugars increased (approximately by 25%)”
e1“low-temperature hardening (6 days at 8°C) of cold-sensitive tobacco plants ( Nicotiana tabacum , cv. Samsun)”
e2“In the leaves, cell-wall invertase was activated (approximately by 30%)”
Claim · model-written summary
Apoplast sucrose content in leaves fell threefold during hardening.
- Taxon
- tobacco plantsNicotiana tabacume1
- Organ / stage
- apoplaste0
- Treatment
- low-temperature hardening (6 days at 8°C)e1
- Outcome
- content of sucrosee0
- Direction
- reducede0
- Value
- three timese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of sucrose, the main transport form of sugars, in the apoplast reduced by three times”
e1“low-temperature hardening (6 days at 8°C) of cold-sensitive tobacco plants ( Nicotiana tabacum , cv. Samsun)”
Claim · model-written summary
Root invertase activity fell almost twofold during hardening.
- Taxon
- tobacco plantsNicotiana tabacume1
- Organ / stage
- root systeme0
- Treatment
- low-temperature hardening (6 days at 8°C)e1
- Outcome
- enzyme activitye0
- Direction
- decreasede0
- Value
- almost twicee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the root system, enzyme activity was decreased almost twice”
e1“low-temperature hardening (6 days at 8°C) of cold-sensitive tobacco plants ( Nicotiana tabacum , cv. Samsun)”
Claim · model-written summary
Root sugar content was essentially unchanged during hardening.
- Taxon
- tobacco plantsNicotiana tabacume1
- Organ / stage
- root systeme2
- Treatment
- low-temperature hardening (6 days at 8°C)e1
- Outcome
- content of sugarse0
- Direction
- essentially unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of sugars in them was essentially unchanged”
e1“low-temperature hardening (6 days at 8°C) of cold-sensitive tobacco plants ( Nicotiana tabacum , cv. Samsun)”
e2“in the root system, enzyme activity was decreased almost twice”
Claim · model-written summary
Leaf changes indicate inhibition of assimilate outflow to roots.
- Taxon
- tobacco plantsNicotiana tabacume1
- Outcome
- assimilate outflow from leaves to rootse0
- Direction
- inhibitede0
- Qualifier
- all these changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all these changes indicate that assimilate outflow from leaves to roots was inhibited”
e1“low-temperature hardening (6 days at 8°C) of cold-sensitive tobacco plants ( Nicotiana tabacum , cv. Samsun)”
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See all 16 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.