Alhagi sparsifolia Shap. （Fabaceae） is a spiny, perennial herb. The species grows in the salinized, arid regions in North China. This study investigated the response characteristics of the root growth and the dis- t...Alhagi sparsifolia Shap. （Fabaceae） is a spiny, perennial herb. The species grows in the salinized, arid regions in North China. This study investigated the response characteristics of the root growth and the dis- tribution of one-year-old A. sparsifolia seedlings to different groundwater depths in controlled plots. The eco- logical adaptability of the root systems of A. sparsifolia seedlings was examined using the artificial digging method. Results showed that： （1） A. sparsifolia seedlings adapted to an increase in groundwater depth mainly through increasing the penetration depth and growth rate of vertical roots. The vertical roots grew rapidly when soil moisture content reached 3%-9%, but slowly when soil moisture content was 13%-20%. The vertical roots stopped growing when soil moisture content reached 30% （the critical soil moisture point）. （2） The morphological plasticity of roots is an important strategy used by A. sparsifolia seedlings to obtain water and adapt to dry soil conditions. When the groundwater table was shallow, horizontal roots quickly expanded and tillering increased in order to compete for light resources, whereas when the groundwater table was deeper, vertical roots developed quickly to exploit space in the deeper soil layers. （3） The decrease in groundwater depth was probably respon- sible for the root distribution in the shallow soil layers. Root biomass and surface area both decreased with soil depth. One strategy of A. sparsifolia seedlings in dealing with the increase in groundwater depth is to increase root biomass in the deep soil layers. The relationship between the root growth/distribution of A. sparsifolia and the depth of groundwater table can be used as guidance for harvesting A. sparsifolia biomass and managing water resources for forage grasses. It is also of ecological significance as it reveals how desert plants adapt to arid environments.展开更多
目的:提取分离骆驼刺茎枝粗多糖,测定其理化性质及抗氧化活性。方法:采用水提醇沉法提取骆驼刺茎枝粗多糖,硫酸苯酚法测定总糖含量,考马斯亮蓝法测定蛋白含量,咔唑硫酸法测定糖醛酸含量,GC法测定单糖组成及相对摩尔比;通过测定骆驼刺茎...目的:提取分离骆驼刺茎枝粗多糖,测定其理化性质及抗氧化活性。方法:采用水提醇沉法提取骆驼刺茎枝粗多糖,硫酸苯酚法测定总糖含量,考马斯亮蓝法测定蛋白含量,咔唑硫酸法测定糖醛酸含量,GC法测定单糖组成及相对摩尔比;通过测定骆驼刺茎枝多糖的还原力,及其对1,1-二苯基-2-三硝基苯肼(DPPH)自由基和羟自由基的清除力,评价骆驼刺茎枝多糖的体外抗氧化活性。结果:水提醇沉制备的骆驼刺茎枝粗多糖总糖含量为73.2%,其中糖醛酸占粗多糖总糖含量的27.2%;蛋白质含量为17.6%;骆驼刺茎枝多糖由Rha、Ara、Xyl、Man、Glc、Gal、Glc A和Gal A 8种单糖组成,相对摩尔比为1.05∶1.00∶1.25∶0.52∶3.05∶1.31∶0.47∶4.78;骆驼刺茎枝多糖的还原力、对DPPH与羟基自由基的清除率随多糖浓度的增大而增强。结论:初步提取分离了骆驼刺茎枝粗多糖,研究了其理化性质和体外抗氧化活性,为骆驼刺的开发利用提供研究基础。展开更多
基金supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-EW-316)the National Natural Science Foundation of China (31070477,30870471)the West Light Foundation of the Chinese Academy of Sciences (XBBS201105)
文摘Alhagi sparsifolia Shap. （Fabaceae） is a spiny, perennial herb. The species grows in the salinized, arid regions in North China. This study investigated the response characteristics of the root growth and the dis- tribution of one-year-old A. sparsifolia seedlings to different groundwater depths in controlled plots. The eco- logical adaptability of the root systems of A. sparsifolia seedlings was examined using the artificial digging method. Results showed that： （1） A. sparsifolia seedlings adapted to an increase in groundwater depth mainly through increasing the penetration depth and growth rate of vertical roots. The vertical roots grew rapidly when soil moisture content reached 3%-9%, but slowly when soil moisture content was 13%-20%. The vertical roots stopped growing when soil moisture content reached 30% （the critical soil moisture point）. （2） The morphological plasticity of roots is an important strategy used by A. sparsifolia seedlings to obtain water and adapt to dry soil conditions. When the groundwater table was shallow, horizontal roots quickly expanded and tillering increased in order to compete for light resources, whereas when the groundwater table was deeper, vertical roots developed quickly to exploit space in the deeper soil layers. （3） The decrease in groundwater depth was probably respon- sible for the root distribution in the shallow soil layers. Root biomass and surface area both decreased with soil depth. One strategy of A. sparsifolia seedlings in dealing with the increase in groundwater depth is to increase root biomass in the deep soil layers. The relationship between the root growth/distribution of A. sparsifolia and the depth of groundwater table can be used as guidance for harvesting A. sparsifolia biomass and managing water resources for forage grasses. It is also of ecological significance as it reveals how desert plants adapt to arid environments.
文摘目的:提取分离骆驼刺茎枝粗多糖,测定其理化性质及抗氧化活性。方法:采用水提醇沉法提取骆驼刺茎枝粗多糖,硫酸苯酚法测定总糖含量,考马斯亮蓝法测定蛋白含量,咔唑硫酸法测定糖醛酸含量,GC法测定单糖组成及相对摩尔比;通过测定骆驼刺茎枝多糖的还原力,及其对1,1-二苯基-2-三硝基苯肼(DPPH)自由基和羟自由基的清除力,评价骆驼刺茎枝多糖的体外抗氧化活性。结果:水提醇沉制备的骆驼刺茎枝粗多糖总糖含量为73.2%,其中糖醛酸占粗多糖总糖含量的27.2%;蛋白质含量为17.6%;骆驼刺茎枝多糖由Rha、Ara、Xyl、Man、Glc、Gal、Glc A和Gal A 8种单糖组成,相对摩尔比为1.05∶1.00∶1.25∶0.52∶3.05∶1.31∶0.47∶4.78;骆驼刺茎枝多糖的还原力、对DPPH与羟基自由基的清除率随多糖浓度的增大而增强。结论:初步提取分离了骆驼刺茎枝粗多糖,研究了其理化性质和体外抗氧化活性,为骆驼刺的开发利用提供研究基础。
