Mucilage inhibits germination of desert ephemeral Nepeta micrantha seed under moderate osmotic stress and promotes recovery after release of this stress
Mucilage inhibits germination of desert ephemeral Nepeta micrantha seed under moderate osmotic stress and promotes recovery after release of this stress
复制标题
粘液抑制沙漠短命荆芥种子在中等渗透胁迫下的发芽，并促进胁迫解除后的恢复
DOI：
10.15258/sst.2020.48.1.03
复制
发表时间：
2020-04
影响因子：
1.4
通讯作者：
Lei Wang
中科院分区：
文献类型：
--
作者：
Chunxiang Zhao;Li Jiang;Xiang Shi;Lei Wang
粘液被认为对种子在恶劣的沙漠环境中的生存起着重要作用。荆芥是中国古尔班通古特沙漠的一种短命植物。微甘菊小坚果的外表面含有一层粘液。我们假设
粘液可改善渗透胁迫期间和之后的发芽。在最佳光照和温度条件下测试了完整和脱粘小坚果在不同聚乙二醇（PEG）模拟的干旱胁迫下的发芽情况。完整和脱粘坚果的发芽率下降
随着 PEG 浓度的增加。然而，在相同 PEG 浓度下，完整坚果和脱粘坚果之间的发芽率没有显着差异（15% PEG 除外）。完整小坚果的回收率和最终发芽率明显高于脱粘小坚果
用 15% PEG 处理后的小坚果。这些发现表明粘液对氮的耐旱性有显着贡献。通过在中等渗透胁迫下减少发芽并在该胁迫释放后帮助发芽来抑制金甘菊小坚果的发芽。
Mucilage is considered to play an important role in the survival of seeds in harsh desert environments. Nepeta micrantha is an ephemeral plant of the Gurbantungut Desert, China. The outer surface of N. micrantha nutlets contains a layer of mucilage. We hypothesised that
mucilage improves germination during and after osmotic stress. Germination of both intact and demucilaged nutlets under different polyethylene glycol (PEG)-simulated drought stress was tested at the optimal light and temperature conditions. Germination of intact and demucilaged nutlets decreased
with an increase in PEG concentration. However, there were no significant differences in germination between intact and demucilaged nutlets at the same PEG concentration, except at 15% PEG. Recovery percentage and final germination of intact nutlets were considerably higher than that of demucilaged
nutlets after treatment with 15% PEG. These findings demonstrate that mucilage contributes significantly to drought tolerance ofN. micrantha nutlets by decreasing germination under moderate osmotic stress and aiding germination after the release of this stress.