Studies On Quality Standard Of Seeds And Seedlings Of Astragali Radix

Astragalus is a bulk medicinal material commonly used,and the basic plant used for it is Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao and Astragalus membranaceus(Fisch.)Bge.This paper will illustrate the experiment and conclusion followed for testing methods of the seeds of Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)and Astragalus membranaceus(Fisch.)Bge.Through testing and analyzing the purity,germination rate,water content,and other plant seed content of the seed samples from major producing regions,the seed quality classification standards for Astragalus membranaceus were established.Through measuring and analyzing the root and root lengths and the lengths of overwintering buds of A.var.mongholicus seedlings,the quality grading standards for A.var.mongholicus seedlings were formulated.The paper obtained the following results:1.The quality testing of seeds of A.var.mongholicus and Astragalus membranaceus can be implemented in the same way,including index as from germination rate,seed viability,water content and 1000-seed weight.The two kinds of seed weight methods assume to be 1000-grain method,with grain weight being of 5.102~7.009.Seed vigor optimum detection method should be TTC staining,the optimum concentration is 0.5% TTC solution in and the dyeing at 30 ℃being of 120 min.Seeds germinate the suitable condition is 15/25 temperature in paper bed.T℃ he initial count time was 3d,and the last count time was 10 d.The moisture content was measured by high temperature(130±2°C)drying method for 3h.2.Measured by index of clarity basis,Astragalus seed germination rate,moisture content and other plant seeds number,seed quality will be categorized as three levels: the first level is as grading standards for clarity a seed ≥98%,the germination rate ≥95%,water content ≤8%,seed number of other plants ≤500 seeds/Kg;the second is as seed ≥95%,germination rate ≥90%,moisture content ≤8%,number of other plant seeds ≤1000 seeds/Kg;the third grade is as seed clarity ≥ 90%,germination rate ≥ 80%,water content ≤ 8%,number of other plant seeds ≤ 1500/Kg.3.According to the 3 index of root length,root diameter and shoot length,quality of seedlings of A.var.mongholicus is divided into 4 grades: the primary seedling diameter is ≥0.8cm,with the seedling length being ≥30cm,and the shoot length ≤1cm;second seedlings’ diameter is ≥ 0.6cm,with seedling length ≥ 25 cm,and bud length ≤ 1.5cm;tertiary seedling diameter is ≥ 0.4cm,with seedling length being ≥ 20 cm,and bud length ≤ 2cm;the fourth seedling diameter is ≥ 0.4cm,with seedling length being 18~ 20 cm,and bud length ≤2.5cm.