Agriophyllum squarrosum is an annual desert plant widely distributed on mobile and semi-mobile dunes in all the sandy deserts of China. We studied the growth and physiological properties of A. squarrosum seedlings und...Agriophyllum squarrosum is an annual desert plant widely distributed on mobile and semi-mobile dunes in all the sandy deserts of China. We studied the growth and physiological properties of A. squarrosum seedlings under different sand burial depths in 2010 and 2011 at Horqin Sandy Land, Inner Mongolia to understand the ability and mechanism that A. squarrosum withstands sand burial. The results showed that A. squarrosum had a strong ability to withstand sand burial. Its survival rate, plant height and biomass increased significantly at a burial depth 25% of seedling height and decreased significantly only when the burial depth exceeded the height of the seedlings; some plants still survived even if the burial depth reached 266% of a seedling height. The malondialdehyde （MDA） content and membrane permeability of the plant did not change significantly as long as the burial depth was not greater than the seedling height; lipid peroxidation increased and cell membranes were damaged if the burial depth was increased further. When subjected to sand burial stress, superoxide dismutase （SOD） and peroxidase （POD） activities and free proline content increased in the seedlings, while the catalase （CAT） activity and soluble sugar content decreased. Sand burial did not lead to water stress. Reductions in photosynthetic area and cell membrane damage caused by sand burial may be the major mechanisms increasing mortality and inhibiting growth of the seedling. But the increases in SOD and POD activities and proline content must play a certain role in reducing sand burial damage.展开更多
The present study focuses on straw checkerboards established in the Shapotou Desert Research and Experimental Station at the southeastern edge of the Tengger Desert and their effects on the species richness and the ab...The present study focuses on straw checkerboards established in the Shapotou Desert Research and Experimental Station at the southeastern edge of the Tengger Desert and their effects on the species richness and the abundance of Agriophyllum squarrosu Moq. Specifically, detailed analyses on the spatial distribution of A. squarrosum and the related soil properties were carried out at a small scale in the straw checkerboards. A. squarrosum is an excellent pioneer plant for revegetation in desert areas. However, the distribution pattern of A. squarrosum and the influencing factors have not been sufficiently delineated. The results showed that the species richness and the abundance of A. squarrosum were decreased exponentially from the border to the center of the straw checkerboards. At the micro-geomorphological scale, the soil texture, soil organic matter （SOM）, soil nutrients （nitrogen, phosphorus and potassium）, and soil infiltration rate in the topsoil tended to increase from the center to the border within a straw checkerboard, while soil moisture presented an opposite tendency. The soil seed bank ofA. squarrosum, soil bulk density, electrical conductivity, sand content, CaCO3 accumulation, and pH showed no significant difference （P〉0.05） between the border and the center of the straw checkerboards. Multiple linear regression analysis indicated that the abundance of A. squarrosum was mainly determined by the concentrations of SOM, nitrogen, and the infiltration rate, implying that nutrient acclimation was the optimal competitive strategy ofA. squarrosum for surviving in a barren natural environment of an arid desert region.展开更多
[Objective] The aim was to investigate the fatty acid and amino acid components of Agriophyllum squarrosum seeds from Xinjiang.[Method] The oil sample was extracted from kernels of A.squarrosum seeds collected from Xi...[Objective] The aim was to investigate the fatty acid and amino acid components of Agriophyllum squarrosum seeds from Xinjiang.[Method] The oil sample was extracted from kernels of A.squarrosum seeds collected from Xinjiang for measuring the components and contents of fatty acids with GC-MS;semi-micro Kjeldahl method and fractional extraction were conducted to get the proteins from the kernels and determine amino acids of the proteins.[Result] The fat content of A.squarrosum seeds was as high as up to 13.7%,among which unsaturated fatty acid and linoleic acid were the major components,accounting for more than 80% of the total fatty acids,while saturated fatty acid content was lower.The content of crude proteins was 24.37% in A.squarrosum seeds,in which globulin and albumin were the main components,accounting for more than 80% of the total proteins,while glutenin,gliadin and residue proteinswere less.Protein got from A.squarrosum seeds belonged to complete protein,contained 18 kinds of amino acids.The content of glutamic acid was the highest（18.3%）,followed by arginine（9.46%）,aspartate（9.27%）,leucine（6.67%）,phenylalanine（5.04%）,serine,methionine,lysine,valine,cystine,histidine and tryptophane.In addition,A.squarrosum seed was rich in essential amino acid.[Conclusion] The paper will provide reference for comprehensive development of A.squarrosum resources from Xinjiang.展开更多
基金funded by the National Natural Science Foundation of China (31270752, 30972422)the National Key Technology R&D Program (2011BAC07B02-06)the Foundation for Excellent Youth Scholars of CAREERI, Chinese Academy of Sciences (Y451081001, Y451111001)
文摘Agriophyllum squarrosum is an annual desert plant widely distributed on mobile and semi-mobile dunes in all the sandy deserts of China. We studied the growth and physiological properties of A. squarrosum seedlings under different sand burial depths in 2010 and 2011 at Horqin Sandy Land, Inner Mongolia to understand the ability and mechanism that A. squarrosum withstands sand burial. The results showed that A. squarrosum had a strong ability to withstand sand burial. Its survival rate, plant height and biomass increased significantly at a burial depth 25% of seedling height and decreased significantly only when the burial depth exceeded the height of the seedlings; some plants still survived even if the burial depth reached 266% of a seedling height. The malondialdehyde （MDA） content and membrane permeability of the plant did not change significantly as long as the burial depth was not greater than the seedling height; lipid peroxidation increased and cell membranes were damaged if the burial depth was increased further. When subjected to sand burial stress, superoxide dismutase （SOD） and peroxidase （POD） activities and free proline content increased in the seedlings, while the catalase （CAT） activity and soluble sugar content decreased. Sand burial did not lead to water stress. Reductions in photosynthetic area and cell membrane damage caused by sand burial may be the major mechanisms increasing mortality and inhibiting growth of the seedling. But the increases in SOD and POD activities and proline content must play a certain role in reducing sand burial damage.
基金supported by the National Natural Science Foundation of China(41671076,41530746)the National Basic Research Program of China(2013CB429905)the Youth Innovation Promotion Association of Chinese Academy of Sciences(2017463)
文摘The present study focuses on straw checkerboards established in the Shapotou Desert Research and Experimental Station at the southeastern edge of the Tengger Desert and their effects on the species richness and the abundance of Agriophyllum squarrosu Moq. Specifically, detailed analyses on the spatial distribution of A. squarrosum and the related soil properties were carried out at a small scale in the straw checkerboards. A. squarrosum is an excellent pioneer plant for revegetation in desert areas. However, the distribution pattern of A. squarrosum and the influencing factors have not been sufficiently delineated. The results showed that the species richness and the abundance of A. squarrosum were decreased exponentially from the border to the center of the straw checkerboards. At the micro-geomorphological scale, the soil texture, soil organic matter （SOM）, soil nutrients （nitrogen, phosphorus and potassium）, and soil infiltration rate in the topsoil tended to increase from the center to the border within a straw checkerboard, while soil moisture presented an opposite tendency. The soil seed bank ofA. squarrosum, soil bulk density, electrical conductivity, sand content, CaCO3 accumulation, and pH showed no significant difference （P〉0.05） between the border and the center of the straw checkerboards. Multiple linear regression analysis indicated that the abundance of A. squarrosum was mainly determined by the concentrations of SOM, nitrogen, and the infiltration rate, implying that nutrient acclimation was the optimal competitive strategy ofA. squarrosum for surviving in a barren natural environment of an arid desert region.
文摘[Objective] The aim was to investigate the fatty acid and amino acid components of Agriophyllum squarrosum seeds from Xinjiang.[Method] The oil sample was extracted from kernels of A.squarrosum seeds collected from Xinjiang for measuring the components and contents of fatty acids with GC-MS;semi-micro Kjeldahl method and fractional extraction were conducted to get the proteins from the kernels and determine amino acids of the proteins.[Result] The fat content of A.squarrosum seeds was as high as up to 13.7%,among which unsaturated fatty acid and linoleic acid were the major components,accounting for more than 80% of the total fatty acids,while saturated fatty acid content was lower.The content of crude proteins was 24.37% in A.squarrosum seeds,in which globulin and albumin were the main components,accounting for more than 80% of the total proteins,while glutenin,gliadin and residue proteinswere less.Protein got from A.squarrosum seeds belonged to complete protein,contained 18 kinds of amino acids.The content of glutamic acid was the highest（18.3%）,followed by arginine（9.46%）,aspartate（9.27%）,leucine（6.67%）,phenylalanine（5.04%）,serine,methionine,lysine,valine,cystine,histidine and tryptophane.In addition,A.squarrosum seed was rich in essential amino acid.[Conclusion] The paper will provide reference for comprehensive development of A.squarrosum resources from Xinjiang.
