Abstract
In order to test the drought tolerant ability,the six poplar clones were treated with PEG(mW 6000)solution at three osmotic potential levels(-0.4 MPa, -1.0MPa,-1.6MPa),and their net photosyathesis rates(Pn)were siudied in growth culture chamber. The results show that under -1.6MPa stress Popelys simonii,P.poplaris 36 and 44 kept more photosynthesis product accumulation until the second day, however,that of P.nigra,P.euramericane 25/86 and 28/86 decreased to consumption level since the first day.And also there was the same trend in Pn decline under -1.0 MPa stress.According to this significant difference in Pn of different clones under medium and severe water stress,the concept of water potential conpensation point of net photosynthesis rate(Pn=0)is determined as a indicator evaluating drought tolerance.Thus, the six poplar clones can be divided into two types:The former group in which the water potnetial compensation point appears later,has a higherability to drought tolerance,and the latter group has a lower drought tolerance since the Water potential compensation point appears earlier.This will be significantly important for early identificantion and selection of genetic variation in drought tolerance for poplar clones.
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Claims 6
Claim · model-written summary
Under -1.6 MPa stress, Populus simonii and P. poplaris 36 and 44 kept more photosynthesis product accumulation until the second day.
- Material
- Popelys simonii,P.poplaris 36 and 44e1
- Treatment
- -1.6MPa stresse1
- Outcome
- photosynthesis product accumulatione1
- Direction
- kept moree1
- Qualifier
- until the second daye1
- Comparator
- P.nigra,P.euramericane 25/86 and 28/86e1
- Setting
- growth culture chambere0
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six poplar clones were treated with PEG(mW 6000)solution at three osmotic potential levels(-0.4 MPa, -1.0MPa,-1.6MPa),and their net photosyathesis rates(Pn)were siudied in growth culture chamber”
e1“The results show that under -1.6MPa stress Popelys simonii,P.poplaris 36 and 44 kept more photosynthesis product accumulation until the second day, however,that of P.nigra,P.euramericane 25/86 and 28/86 decreased to consumption level since the first day”
Claim · model-written summary
Under -1.6 MPa stress, P. nigra and P. euramericana 25/86 and 28/86 decreased photosynthesis product accumulation to consumption level since the first day.
- Material
- P.nigra,P.euramericane 25/86 and 28/86e1
- Treatment
- -1.6MPa stresse1
- Outcome
- photosynthesis product accumulatione1
- Direction
- decreasede1
- Qualifier
- since the first daye1
- Comparator
- Popelys simonii,P.poplaris 36 and 44e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six poplar clones were treated with PEG(mW 6000)solution at three osmotic potential levels(-0.4 MPa, -1.0MPa,-1.6MPa),and their net photosyathesis rates(Pn)were siudied in growth culture chamber”
e1“The results show that under -1.6MPa stress Popelys simonii,P.poplaris 36 and 44 kept more photosynthesis product accumulation until the second day, however,that of P.nigra,P.euramericane 25/86 and 28/86 decreased to consumption level since the first day”
Claim · model-written summary
The same trend in Pn decline occurred under -1.0 MPa stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six poplar clones were treated with PEG(mW 6000)solution at three osmotic potential levels(-0.4 MPa, -1.0MPa,-1.6MPa),and their net photosyathesis rates(Pn)were siudied in growth culture chamber”
e2“And also there was the same trend in Pn decline under -1.0 MPa stress”
Claim · model-written summary
The water potential compensation point of Pn (Pn=0) is proposed as an indicator for evaluating drought tolerance in poplar clones.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six poplar clones were treated with PEG(mW 6000)solution at three osmotic potential levels(-0.4 MPa, -1.0MPa,-1.6MPa),and their net photosyathesis rates(Pn)were siudied in growth culture chamber”
e3“According to this significant difference in Pn of different clones under medium and severe water stress,the concept of water potential conpensation point of net photosynthesis rate(Pn=0) is determined as a indicator evaluating drought tolerance”
Claim · model-written summary
Poplar clones whose water potential compensation point appears later have higher drought tolerance.
- Treatment
- water potnetial compensation point appears latere4
- Outcome
- drought tolerancee4
- Direction
- higherabilitye4
- Comparator
- the latter groupe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six poplar clones were treated with PEG(mW 6000)solution at three osmotic potential levels(-0.4 MPa, -1.0MPa,-1.6MPa),and their net photosyathesis rates(Pn)were siudied in growth culture chamber”
e4“The former group in which the water potnetial compensation point appears later,has a higherability to drought tolerance,and the latter group has a lower drought tolerance”
Claim · model-written summary
Poplar clones whose water potential compensation point appears earlier have lower drought tolerance.
- Treatment
- Water potential compensation point appears earliere5
- Outcome
- drought tolerancee4
- Direction
- lowere4
- Comparator
- former groupe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six poplar clones were treated with PEG(mW 6000)solution at three osmotic potential levels(-0.4 MPa, -1.0MPa,-1.6MPa),and their net photosyathesis rates(Pn)were siudied in growth culture chamber”
e4“The former group in which the water potnetial compensation point appears later,has a higherability to drought tolerance,and the latter group has a lower drought tolerance”
e5“since the Water potential compensation point appears earlier”