Ethephon Alleviates the Damage of Salt Stress to Rice Seedling Roots
In order to study the regulation effect of exogenous ethephon on the root growth of rice seedlings under salt stress,the effects of different concentrations of ethephon(0,50 and 500 mg/L)on the root morphology and physiological characteristics of rice seedlings under salt stress(0,3 and 6 g/L NaCl)were studied by sand culture with salt tolerant variety'Shuangyou2088'and salt sensitive variety'IR29'.The results show that ETH in different concentrations(0,50 and 500 mg/L)seed soaking can promote the root growth of rice seedlings under salt stress,and significantly increase the root dry weight,total root length,total surface area,total root volume and root-shoot ratio of two rice varieties;increase the activity of root antioxidant enzymes(SOD,APX,CAT),improve the con-tent of osmotic regulating substances(soluble protein and proline),and reduce MDA content.The results showed that ETH decreased MDA content,alleviated oxidative damage caused by salt stress and promoted the growth and development of rice root system by increasing CAT activity of'IR29'and APX activity of'Shuangyou 2088'.The control effect was 50 mg/L ETH＞500 mg/L ETH.These results showed that ETH could be used as an effective rice seed soaking agent to alleviate the inhibition of salt stress on the growth of rice seedlings.This study provides a simple and effective method for improving the salt tolerance of rice.
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