Effects of Exogenous Calcium on Datura Seed Germination under Drought Stress
Effects of Exogenous Calcium on Datura Seed Germination under Drought Stress
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DOI：
10.30564/jrb.v1i2.862
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发表时间：
2019-09
期刊：
影响因子：
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通讯作者：
Yongji Wang
中科院分区：
文献类型：
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作者：
Yongji Wang
以聚乙二醇（PEG-6000）、0%（CK）、5%、10%、15%、25%分别模拟干旱胁迫，以cacl2浓度为0 （CK）、15、20、25和30mmol/L作为外源钙离子梯度，研究干旱、外源钙以及两者之间的相互作用对曼陀罗种子萌发的影响，从而探索外源钙缓解干旱胁迫对曼陀罗种子萌发抑制的最佳施量。结果表明，曼陀罗种子的发芽率、萌发势和萌发指数均显著低于对照组。在正常水分条件下，中低浓度外源钙对曼陀罗种子萌发无显著影响，高浓度外源钙对曼陀罗种子萌发有抑制作用。干旱胁迫下，随着外源钙浓度的增加，曼陀罗种子3项指标均呈现先升高后降低的趋势。当外源钙浓度为20 mmol/L时，种子萌发各项指标均达到最大值，而当外源钙浓度为25 ~ 30 mmol/L时，种子萌发率呈下降趋势，并随着干旱的加剧而日益急剧。因此，在曼陀罗的生产和利用中，在中低干旱条件下，播前用20 mmol/L外源钙浸泡种子，可提高出苗率。
With polyethylene glycol (PEG-6000), of 0%(CK), 5%, 10%, 15%, 25% used to simulate drought stress, and CaCl 2 concentration 0 (CK), of 15, 20, 25 and 30mmol/L as ion gradient of exogenous calcium, the effects of drought, exogenous calcium and the interaction between the two on the Datura seed germination, so as to explore the optimal application amount of exogenous calcium to ease the suppression of drought stress on Datura seed germination. The results showed that the germination rate, germination potential and germination index of the Datura seeds were significantly lower than those of the control group. Under the normal moisture condition, exogenous calcium of moderate and low concentration had no significant effect on the Datura seed germination, while that of high concentration showed an inhibitory effect on the seed germination. Under drought stress, with the increasing concentration of exogenous calcium, the three indicators of Datura seeds showed a trend of increasing first and then decreasing. When the exogenous calcium had the concentration of 20 mmol/L, all the indicators of seed germination reached the maximum value, while showed a downward trend when exogenous calcium concentration was 25-30 mmol/L, and even increasingly sharp with drought intensifying. Therefore, in the production and utilization of Datura, 20 mmol/L of exogenous calcium can be used to soak seeds before sowing to improve the emergence rate under low and moderate drought conditions.