Effects of plant growth regulators and fungicides on the quality of Prunella vulgaris seedlings

doi:10.14088/j.cnki.issn0439-8114.2026.09.018

Abstract

Abstract: To investigate the effects of different plant growth regulators and fungicides on the growth and physiological characteristics of Prunella vulgaris seedlings, and to improve seedling quality, P. vulgaris seeds were used as materials, and under plug seedling cultivation, GA₃(50 mg/L), IAA (25 mg/L), 6-BA (25 mg/L), carbendazim (0.5 g/L), chlorothalonil (0.5 g/L), thiophanate-methyl (0.5 g/L), and purified water (CK) were sprayed, respectively. Seedling morphological characteristics, agronomic traits, dry matter mass, and physiological and biochemical indicators were measured, and a comprehensive evaluation was conducted using the entropy weight method. The results showed that GA₃ significantly altered the aboveground morphology of the seedlings, increasing plant height, leaf length, and aboveground dry matter accumulation, but inhibited stem diameter, root volume, and root dry matter accumulation, making it easy to form weak seedlings. IAA and 6-BA treatments were beneficial for belowground dry matter accumulation and the increase of leaf soluble sugar content, with IAA significantly increasing root soluble protein content, while 6-BA maintained a higher total photosynthetic pigment content. Among the three fungicides, chlorothalonil treatment increased leaf width and the overall quality of the seedlings, whereas carbendazim and thiophanate-methyl treatments inhibited root volume and leaf number, respectively, and significantly reduced the comprehensive quality of the seedlings. The comprehensive evaluation using the entropy weight method showed that the seedlings treated with IAA and 6-BA had the highest comprehensive quality scores, ranking first and second, respectively, outperforming those treated with GA₃ and the three fungicides. In conclusion, spraying IAA or 6-BA could effectively promote the growth and improve the quality of P. vulgaris seedlings; in preventing diseases, chlorothalonil had less adverse effect on seedling quality compared to thiophanate-methyl and carbendazim.

Key words: Prunella vulgaris L., plant growth regulator, fungicide, agronomic traits, physiological characteristics

CLC Number:

S567.23⁺9

WANG Kai, HAN Shu-hua, YAN You-lin, AN Hui-chao, MA Chong, XU Ke-xin, WANG Li, FAN Jing-chao. Effects of plant growth regulators and fungicides on the quality of Prunella vulgaris seedlings[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(9): 111-116.

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