| Influence of PEG stress on cotyledons physiology and oxymatrine content in germinating seeds of Sophora alopecuroides |
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| DOI：10.7606/j.issn.1000-7601.2016.03.26 |
| Key Words: Sophora alopecuroides germinating seed PEG stress cotyledons physiology oxymatrine |
| Author Name | Affiliation | | LIU Dan | College of Agronomy, Ningxia University, Yinchuan, Ningxia 750021, China | | WANG Xue | College of Agronomy, Ningxia University, Yinchuan, Ningxia 750021, China | | YANG Yi | College of Agronomy, Ningxia University, Yinchuan, Ningxia 750021, China | | DUAN Qi-rong | College of Agronomy, Ningxia University, Yinchuan, Ningxia 750021, China | | LI Ya-bin | College of Agronomy, Ningxia University, Yinchuan, Ningxia 750021, China | | LIU Jing | College of Agronomy, Ningxia University, Yinchuan, Ningxia 750021, China | | LIU Ping | College of Agronomy, Ningxia University, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| The drought resistance and physiological characteristic and oxymatrine (OMA) content of Sophora alopecuroides germinating seed were investigated under the simulation drought stress by PEG-6000. The results showed that germinating energy, germinating percentage, germinating index, and seeds vigor index of S. alopecuroides simultaneously reached maximum at 10% PEG, with maximum value of 66.76%，78.67%, 24.40, and 183.79 respectively. Meanwhile, at 20% PEG stress, significant germinating capability was still detected in germinating seed of S. alopecuroides. With increasing PEG stress, the relative permeability of plasma membrane and proline content increased gradually, while malonaldehyde (MDA) content in cotyledon of S. alopecuroides germinating seed decreased. It was found that the protecting mechanisms of peroxidase (POD), catalase (CAT) and superoxide dismutase (SOD) for S. alopecuroides germinating seed under PEG stress varied, with POD playing major role under mild stress (PEG≤20%) but CAT and SOD under severe stress (PEG＞20%). OMA content in cotyledons of S. alopecuroides germinating seed decreased with higher PEG stress and OMA content was found to be negatively correlated with relative permeability of plasma membrane, proline and MDA content, and activities of SOD, POD and CAT. These results indicate that moderate drought stress is helpful to S. alopecuroides at seed germination stage. |
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