Abstract
Soil salinity is important abiotic stress affecting various ecosystems worldwide such as grassland. Distinct ecotypes often evolve within species by natural selection to facilitate adaptation to different types of environmental stress. Leymus chinensis is a perennial rhizomatous grass that is widely distributed in the eastern Eurasian steppe; it has two main ecotypes, namely, yellow-green (YG) and gray-green (GG), which differ in their strategy for coping with salinity stress. Few studies have examined the seed germination of the two ecotypes under salinity stress. In this study, the seed germination and seedling growth of two ecotypes of L. chinensis in response to different levels of salinity (NaCl) stress [0 (control), 20, 50, 100, and 200 mM] were examined. Then, ungerminated seeds were placed under normal conditions to evaluate seedling growth following exposure to salt stress (i.e., regermination). The germination percentage was significantly higher, and the mean germination time was significantly shorter in the GG ecotype than in the YG ecotype at all NaCl concentrations. As the salinity level increased, the radicle length of the two ecotypes decreased; however, GG had longer radicles and a higher number of radicles, even at 200 mM NaCl when no radicle protruding from the seed coat was detected in YG. The shoot length of GG was significantly longer than that of YG at all NaCl levels. After salinity stress was removed, the seed germination percentage increased as the original concentration of NaCl applied increased, but the total germination percentage did not significantly differ among NaCl concentrations. The total seed germination percentage of GG was approximately 80%, whereas that of the YG was approximately 20%. The seedling length of regerminated seeds for both GG and YG was similar. The thousand-grain weight of GG was significantly higher than that of YG. GG was more salt-tolerant than YG and might be better capable of surviving in harsher environments, suggesting that GG might be particularly useful for saline grassland restoration.
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Claims 12
Claim · model-written summary
GG germination percentage was significantly higher than YG at all NaCl concentrations.
Verbatim
e0“The germination percentage was significantly higher, and the mean germination time was significantly shorter in the GG ecotype than in the YG ecotype at all NaCl concentrations”
t0“Leymus chinensis”
Claim · model-written summary
GG mean germination time was significantly shorter than YG at all NaCl concentrations.
Verbatim
e0“The germination percentage was significantly higher, and the mean germination time was significantly shorter in the GG ecotype than in the YG ecotype at all NaCl concentrations”
t0“Leymus chinensis”
Claim · model-written summary
Radicle length of both ecotypes decreased as salinity rose.
Verbatim
e0“As the salinity level increased, the radicle length of the two ecotypes decreased”
t0“Leymus chinensis”
Claim · model-written summary
GG had longer and more radicles than YG, including at 200 mM NaCl.
Verbatim
e0“GG had longer radicles and a higher number of radicles, even at 200 mM NaCl when no radicle protruding from the seed coat was detected in YG”
t0“Leymus chinensis”
Claim · model-written summary
GG shoots were significantly longer than YG at all NaCl levels.
Verbatim
e0“The shoot length of GG was significantly longer than that of YG at all NaCl levels”
t0“Leymus chinensis”
Claim · model-written summary
After salt removal, germination percentage rose with original NaCl concentration.
Verbatim
e0“After salinity stress was removed, the seed germination percentage increased as the original concentration of NaCl applied increased”
t0“Leymus chinensis”
Claim · model-written summary
Total germination percentage did not significantly differ across NaCl concentrations.
- Taxon
- Leymus chinensisLeymus chinensist0
- Treatment
- NaCl concentrationse0
- Outcome
- total germination percentagee0
- Direction
- did not significantly differe0
Not reportedComparator
Verbatim
e0“the total germination percentage did not significantly differ among NaCl concentrations”
t0“Leymus chinensis”
Claim · model-written summary
GG total germination was approximately 80%.
- Taxon
- Leymus chinensisLeymus chinensist0
- Material
- GGe0
- Outcome
- total seed germination percentagee0
- Value
- approximately 80%e0
Verbatim
e0“The total seed germination percentage of GG was approximately 80%”
t0“Leymus chinensis”
Claim · model-written summary
YG total germination was approximately 20%.
- Taxon
- Leymus chinensisLeymus chinensist0
- Material
- YGe0
- Outcome
- that of the YGe0
- Value
- approximately 20%e0
Verbatim
e0“that of the YG was approximately 20%”
t0“Leymus chinensis”
Claim · model-written summary
Regerminated seedling length was similar for both ecotypes.
- Taxon
- Leymus chinensisLeymus chinensist0
- Material
- GG and YGe0
- Outcome
- seedling lengthe0
- Direction
- similare0
Verbatim
e0“The seedling length of regerminated seeds for both GG and YG was similar”
t0“Leymus chinensis”
Claim · model-written summary
GG thousand-grain weight was significantly higher than YG.
Verbatim
e0“The thousand-grain weight of GG was significantly higher than that of YG”
t0“Leymus chinensis”
Claim · model-written summary
Authors infer GG is more salt tolerant and potentially useful for saline grassland restoration.
Verbatim
e0“GG was more salt-tolerant than YG and might be better capable of surviving in harsher environments, suggesting that GG might be particularly useful for saline grassland restoration”
t0“Leymus chinensis”
The same questions in other papers
sodium chloride · growth · Leymus chinensisResults differ
1 paper in the same direction as this paper · 5 in the opposite direction
- negative
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3 papers more in this group
See all 7 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.