Physiological and transcriptomic analyses to reveal underlying phenolic acid action in consecutive monoculture problem of Polygonatum odoratum

Table 1 Regression equations of phenolic acid standard samples using external standard method

Phenolic acid standard sample	Regression equation	R²	Retention time (min)
p-hydroxybenzoic acid	y = 19.394x + 0.5019	0.999	15.42
Vanillic acid	y = 19.040x + 0.0441	0.999	19.29
Syringic acid	y = 29.678x - 0.0005	0.999	21.84
Cumaric acid	y = 42.687x + 0.3221	0.999	27.16
Ferulic acid	y = 27.663x - 0.0114	0.999	28.94

ISSN: 1471-2229