Hydropriming accelerates seed germination of Medicago sativa under stressful conditions: A thermal and hydrotime model approach
Hydropriming accelerates seed germination of Medicago sativa under stressful conditions: A thermal and hydrotime model approach
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水引发在应激条件下加速紫花苜蓿种子发芽：热和水时间模型方法
DOI：
10.18805/lr.v0i0.8404
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发表时间：
2017-08-01
期刊：
影响因子：
0.8
通讯作者：
Hu, Xiaowen
中科院分区：
文献类型：
--
作者：
Li, Rong;Min, Dandan;Hu, Xiaowen
本研究测定了引发对温度、水势和盐分的响应对种子萌发的影响。热模型和水时间模型被用来评估启动后模型参数的变化。引发缩短了两个品种的发芽温度，但略有提高“陇东”发芽的基温，从1.0℃提高到3.5℃。在高水势下，引发显着提高发芽率，而在低水势下，引发效果不明显。此外，引发降低了水时间常数，但使两个品种的中位数基础水势值略为正。因此，引发提高了种子在水中的发芽率，但在严重水分胁迫下却降低了发芽率。盐胁迫下，两个品种的发芽率均显著提高。此外，引发促进了两个品种幼苗对温度、水分和盐分胁迫的反应。
This study determined the effects of priming on germination in response to temperature, water potential and NaCl. Thermal and hydrotime models were utilized to evaluate changes in parameters of the model after priming. Priming reduced the amount of thermal time in both cultivars, but slightly increased the base temperature for germination from 1.0 to 3.5°C in “Longdong”. Priming significantly increased germination rate at high water potential but had no effect at low water potential. Further, priming reduced the hydrotime constant but made the median base water potential value slightly more positive in both cultivars. Thus, priming increased germination rate in water but decrease it under severe water stress. Germination rate was significantly increased in both cultivars under salinity (NaCl) stress. Moreover, priming improved seedling growth in response to temperature, water and salinity stress in both cultivars.