Abstract
Circular drought-hardening was applied on tobacco seedlings raised on floating trays by the circle of water control-half wilting-rehydration-recovery.The results showed that the circular drought-hardening can significantly increased content of the osmotic adjustment substances soluble sugar and proline in leaves,stems and roots of tobacco plants,and decreased osmotic potential in leaves.When the drought-hardened seedlings were subjected to subsequent drought stress,as compared with control without the drought hardening,they could accumulate more soluble sugar and proline in leaves,stems and roots,and maintain higer pressure potential through decreasing osmotic potential in leaves.All these results indicated that osmotic regulation participates in the drought hardening-induced enhancement of drought resistance in tobacco plants.In addition,the circular drought-hardening increased root/shoot ratio of tobacco seedlings.The results suggested that the drought hardening,on the one hand,led to physiological adaptation of tobacco plants to drought through osmotic regulation,on the other hand,to morphological adaption to drought through regulating partition of photosynthates between over-and under-ground part,and enhanced the drought resistance of tobacco plants.
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Claims 6
Claim · model-written summary
Circular drought-hardening significantly increased soluble sugar and proline content in leaves, stems and roots of tobacco plants.
- Taxon
- tobacco plants
Nicotiana tabacume1 - Organ / stage
- leaves,stems and rootse1
- Treatment
- circular drought-hardeninge1
- Outcome
- content of the osmotic adjustment substances soluble sugar and prolinee1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The results showed that the circular drought-hardening can significantly increased content of the osmotic adjustment substances soluble sugar and proline in leaves,stems and roots of tobacco plants”
Claim · model-written summary
Drought-hardened seedlings subjected to subsequent drought stress accumulated more soluble sugar and proline in leaves, stems and roots than control seedlings without drought hardening.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- leaves,stems and rootse2
- Treatment
- subsequent drought stresse2
- Outcome
- soluble sugar and prolinee2
- Direction
- moree2
- Comparator
- control without the drought hardeninge2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Circular drought-hardening was applied on tobacco seedlings”
e2“When the drought-hardened seedlings were subjected to subsequent drought stress,as compared with control without the drought hardening,they could accumulate more soluble sugar and proline in leaves,stems and roots”
Claim · model-written summary
Drought-hardened seedlings under subsequent drought stress maintained higher pressure potential than control seedlings without drought hardening.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- leavese3
- Treatment
- subsequent drought stresse3
- Outcome
- pressure potentiale3
- Direction
- higere3
- Comparator
- control without the drought hardeninge3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Circular drought-hardening was applied on tobacco seedlings”
e3“When the drought-hardened seedlings were subjected to subsequent drought stress,as compared with control without the drought hardening,they could accumulate more soluble sugar and proline in leaves,stems and roots,and maintain higer pressure potential through decreasing osmotic potential in leaves”
Claim · model-written summary
Circular drought-hardening decreased osmotic potential in leaves of tobacco plants.
- Taxon
- tobacco plantsNicotiana tabacume4
- Treatment
- circular drought-hardeninge4
- Outcome
- osmotic potential in leavese4
- Direction
- decreasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The results showed that the circular drought-hardening can significantly increased content of the osmotic adjustment substances soluble sugar and proline in leaves,stems and roots of tobacco plants,and decreased osmotic potential in leaves”
Claim · model-written summary
Circular drought-hardening increased the root/shoot ratio of tobacco seedlings.
- Taxon
- tobacco seedlingsNicotiana tabacume5
- Treatment
- circular drought-hardeninge5
- Outcome
- root/shoot ratioe5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“In addition,the circular drought-hardening increased root/shoot ratio of tobacco seedlings”
Claim · model-written summary
Osmotic regulation is asserted to participate in the drought hardening-induced enhancement of drought resistance in tobacco plants.
- Taxon
- tobacco plantsNicotiana tabacume6
- Outcome
- enhancement of drought resistancee6
- Qualifier
- osmotic regulatione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“All these results indicated that osmotic regulation participates in the drought hardening-induced enhancement of drought resistance in tobacco plants”
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