FIELD: agriculture. SUBSTANCE: being exposed to low temperatures, two-day corn shoots form a section of root whose axial growth has been initiated during temperature reduction. Low temperature changes the content of cis-ferulic acid in these cells. Said content is determined in shoots by spectral photometric analysis. The relation of cis-ferulic acid content at low temperature (10 C) to its content at an optimum temperature (27 C) determines the degree of cold resistance. This relation being smaller or larger than unity, the plants shall be regarded as resistant or nonresistant to cold, respectively. EFFECT: higher accuracy and reliability of estimate. 1 tbl
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