Abstract：[Background] Regulator for growth, development and reproduction of the plant, is an important means to improve adaptability and production capacity, and has a key impact on ecological construction of desert land management using plant measures. The seed germination ability affects directly the growth, reproduction and production of plants, determines the success of some plants settled in the adversity, and has a critical effect on the life history, population growth, the formation and succession of plants. Astragalus adsurgens is one of the main species for soil and water conservation and ecological construction in the Loess Plateau of China. Understanding the effects of plant growth regulators on seed vigor and germination characteristics of A. adsurgens is for improving adaptive ability to adverse environment and for increasing vegetative coverage during restoration and reconstruction of vegetation. [Methods] The concentrations of 0, 50, 100, 150 and 200 mg/L plant growth regulator GGR6 solution, respectively at 20 ℃ (G50, G100, G150, and G200) and dark conditions (CK) were designed to soak A. adsurgens seed for 24 hours, and the influences of GGR6 on seed vigor and germination characteristics of A. adsurgens were observed. Seed viability test (a constant temperature of 30 ℃) and germination test (constant temperature, relative humidity of 80%, 12 h light and 12 h darkness alternating) were conducted in the artificial climate chamber for the observation of seed vigor, germination energy, germination rate, germination index and vigor index with five replications of each treatment. Excel and SAS 9.0 statistical software were used for data processing, mapping and variance analysis. The suitable GGR6 concentration for A. adsurgens seed germination was selected by membership function method. [Results] 1) The seed germination of A. adsurgens was "unimodal type", and the same tendency presented in the different treatments. The order of seed germination rate was CK > G50 > G100 > G150 > G200 in the first day, and peak value of germination rate (2 to 4 days) was CK < G50 < G100 < G150 < G200. 2) Seed vigor, germination energy, germination rate, germination index, and vigor index of A. adsurgens increased with increasing concentration of GGR6 when GGR6 concentration was below 100 mg/L. The effects of the treatments on seed vigor, germination energy, germination rate, and vigor index were not obvious when the GGR6 concentration was higher than that of 100 mg/L, and germination index also decreased. [Conclusions] 1) GGR6 solution improved the speed and rate of seed germination of A. adsurgens (Germination process advanced 1 day). 2) Each value increased significantly (P < 0.05) when the concentration were 50-100 mg/L. 3) The order of seed vigor and germination characteristic indexes based on the average values of membership function was G100 > G200 > G150 > G50 > CK. The optimal GGR6 concentration was 100 mg/L for seed germination of A. adsurgens.
陈士超1, 王猛1, 高永1, 汪季1, 刘宗奇1, 王香1, 张晓伟2. GGR6浸种处理浓度对沙打旺种子活力及萌发特性的影响[J]. 中国水土保持科学, 2017, 15(2): 70-78.
CHEN Shichao, WANG Meng, GAO Yong, WANG Ji, LIU Zongqi, WANG Xiang, ZHANG Xiaowei. Influences of the different GGR6 concentrations on the seed vigor and germination characteristics of Astragalus adsurgens. SSWC, 2017, 15(2): 70-78.
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2017, Vol. 15 
