| 第一作者： | Meng-Yao Ma |
|---|---|
| 英文第一作者： | Meng-Yao Ma |
| 联系作者： | Hong-Yuan Ma |
| 英文联系作者： | Hong-Yuan Ma |
| 发表年度： | 2021 |
| 卷： | 9 |
| 摘要： | 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 signifificantly higher,
and the mean germination time was signifificantly 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 signifificantly 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 signifificantly 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 signifificantly 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. |
| 刊物名称： | Frontiers in Ecology and Evolution |
| 参与作者： |
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