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Table 1 Sample information and number of growth rings observed using two different methods

From: Rapid identification of growth years and profiling of bioactive ingredients in Astragalus membranaceus var. mongholicus (Huangqi) roots from Hunyuan, Shanxi

Age (years of growth) Number of specimen TRR TRM
1 5 0 1
2 8 1 2
3 8 2 3
4 8 3 4
5 5 4 5
8 3 a 8
10 1 a 10
  1. TRR the number of growth rings observed with the naked eye after staining of transverse sections with phloroglucinol–HCl reagent, TRM the number of growth rings observed using light microscopy
  2. aThe number of growth rings was not clearly observed after staining of transverse sections with phloroglucinol–HCl reagent