柠条锦鸡儿细根生长与游离脯氨酸含量关系研究

Relationship between shape of Cartagana’s root and free proline

摘要:

研究区位于内蒙古敖汉旗黄花甸子流域，在10a生柠条锦鸡儿人工林中分别选取了坡上和坡下样本5丛.通过四分之一圆法采集根系，并将标准丛根系按细根、中根、骨骼根进行划分，并测定长度及游离氨基酸含量.通过比较分析不同土壤含水率条件下的各径级根的长度差异，两样地中各径级根中游离氨基酸含量相关性.得出游离脯氨酸含量百分比在不同土壤含水率条件下变化趋势，和游离氨基酸平均含量与根长的相关趋势.结果表明：（1）细根长度和游离脯氨酸含量均与土壤含水率呈负相关关系.（2）游离脯氨酸含量与根系新生细根存在正相关关系.（3）两样地中各径级根之间游离氨基酸含量具有显著相关性，相关系数均在0.980~0.997之间.（4）游离脯氨酸平均含量与细根比表面积存在正相关关系，且R2=0.9371.研究证明游离脯氨酸对植物对抗干旱胁迫的重要作用，为柠条锦鸡儿复壮和内蒙古农牧交错带植被恢复提供科学依据.

Abstract:

The study area was located in the Huanghuaidian sub-basin of Aohanqi, Inner Mongolia, and 5 clusters of samples were selected in the ten-year-old Caragana korshinskii plantation, on the slope and the slope.The roots were collected by a quarter circle method, and the standard plexus root system was divided into fine root, middle root and bone root.The length and the content of free amino acid were measured.By comparing the differences in the length of each root of the different soil moisture content, the content of free amino acids in the roots of the two species was compared and analyzed.The trend of free amino acid and free proline in different soil water content and the trend of free amino acid average content and root length were obtained.The results show: (1) The length and free proline content of the major organs were negatively correlated with soil water content.(2) There was a positive correlation between the free proline content and the root system.(3) The correlation coefficients of free amino acid content between the two groups were between 0.980 and 0.997, and the correlation was significant.(4) There was a positive correlation between the average content of free proline and the specific surface area of fine roots and R2=0.9371.It is proved that free proline plays an important role in plant resistance to drought stress and provides scientific basis for vegetation restoration of Caragana korshinskii and the interlaced zone of agriculture and grazing in Inner Mongolia.