Abstract
Seed germination and seedling stages are not only crucial stages of the life span of plants,but also important adaptation stages to different environmental conditions.The response of Sophora alopecuroides L.and Thermopsis lanceolate L.seed germina-tion and seedling growth to drought stress in border desert lands of the Hexi Corridor were investigated under simulated drought conditions of polyethylene glycol-6000(PEG) with 0.03 MPa,0.10 MPa,0.24 MPa,0.42 MPa,0.65 MPa and 0.94 MPa osmotic potentials.The main objectives of the study were to reveal the adaptive mechanisms of desert plants and to provide further technical guidance on seedling cultivation and restoration of desert vegetation.The result showed that the rate of seed water uptake,germination percentage,germination index,vigor index,seedling height,root length and plant water content decreased with increas-ing PEG drought stress.However,seedling and root dry weight and root/shoot ratio initially increased followed by a decrease.Fur-thermore,seed germination was sensitive to drought stress.The lowest osmotic potential threshold was 0.65 MPa for S.alopecur-oides seeds and 0.42 MPa for T.lanceolate seeds.For seeds incapable of germination under drought stress,germination percentage was high once water was recovered.The results suggested that response of seed germination and seedling growth to drought stress was ecologically essential for later establishment of seedlings and vegetation.In artificial cultivation,however,a key step for suc-cessful planting was guaranteed soil moisture.
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Claims 8
Claim · model-written summary
Increasing PEG drought stress reduced seed water uptake, germination, seedling growth and plant water content in the two species.
- Taxon
- Sophora alopecuroides and Thermopsis lanceolata
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Thermopsis lanceolata
Sophora alopecuroidest0 - Treatment
- PEG drought stresse0
- Outcome
- seed water uptake,germination percentage,germination indexe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“the rate of seed water uptake,germination percentage,germination index,vigor index,seedling height,root length and plant water content decreased with increas-ing PEG drought stress”
t0“Sophora alopecuroides and Thermopsis lanceolata”
Claim · model-written summary
Increasing PEG drought stress reduced vigor index, seedling height and root length.
- Taxon
- Sophora alopecuroides and Thermopsis lanceolataThermopsis lanceolataSophora alopecuroidest0
- Treatment
- PEG drought stresse0
- Outcome
- vigor index,seedling height,root lengthe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“vigor index,seedling height,root length and plant water content decreased with increas-ing PEG drought stress”
t0“Sophora alopecuroides and Thermopsis lanceolata”
Claim · model-written summary
Plant water content decreased as PEG drought stress increased.
- Taxon
- Sophora alopecuroides and Thermopsis lanceolataThermopsis lanceolataSophora alopecuroidest0
- Treatment
- PEG drought stresse0
- Outcome
- plant water contente0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant water content decreased with increas-ing PEG drought stress”
t0“Sophora alopecuroides and Thermopsis lanceolata”
Claim · model-written summary
Seedling and root dry weight and root/shoot ratio first rose and then fell.
- Taxon
- Sophora alopecuroides and Thermopsis lanceolataThermopsis lanceolataSophora alopecuroidest0
- Outcome
- seedling and root dry weight and root/shoot ratioe0
- Direction
- initially increased followed by a decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedling and root dry weight and root/shoot ratio initially increased followed by a decrease”
t0“Sophora alopecuroides and Thermopsis lanceolata”
Claim · model-written summary
Sophora seed germination had a lowest osmotic potential threshold of 0.65 MPa.
- Taxon
- Sophora alopecuroidesSophora alopecuroidest0
- Outcome
- lowest osmotic potential thresholde0
- Value
- 0.65 MPae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest osmotic potential threshold was 0.65 MPa for S.alopecur-oides seeds”
t0“Sophora alopecuroides”
Claim · model-written summary
Thermopsis seed germination had a lowest osmotic potential threshold of 0.42 MPa.
- Taxon
- Thermopsis lanceolataThermopsis lanceolatat0
- Outcome
- T.lanceolate seedse0
- Value
- 0.42 MPae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“0.42 MPa for T.lanceolate seeds”
t0“Thermopsis lanceolata”
Claim · model-written summary
Ungerminated stressed seeds showed high germination after water recovery.
- Taxon
- Sophora alopecuroides and Thermopsis lanceolataThermopsis lanceolataSophora alopecuroidest0
- Treatment
- water was recoverede0
- Outcome
- germination percentagee0
- Direction
- highe0
- Comparator
- under drought stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For seeds incapable of germination under drought stress,germination percentage was high once water was recovered”
t0“Sophora alopecuroides and Thermopsis lanceolata”
Claim · model-written summary
The authors recommend guaranteed soil moisture for artificial cultivation.
- Taxon
- Sophora alopecuroides and Thermopsis lanceolataThermopsis lanceolataSophora alopecuroidest0
- Outcome
- guaranteed soil moisturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In artificial cultivation,however,a key step for suc-cessful planting was guaranteed soil moisture”
t0“Sophora alopecuroides and Thermopsis lanceolata”