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| Effects of Different Concentrations of Cynanchon，Naphthylacetic Acid and Uniconazole on Growth of Green Onion at Seedling Stage |
| CUI Dandan1，HAN Jinlei2，XU Youquan1，WANG Jing1，LI Shengli1* |
| 1College of Horticulture，Henan Agricultural University，Zhengzhou 450046，Henan，China；2Zhengzhou Park Plaza Affairs Center，Zhengzhou 450046，Henan，China |
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Abstract In order to explore the effects of different plant growth regulators on seedling growth of green onion at seedling stage，the research evaluated the effects of three plant growth regulators（cynanchon，naphthylacetic acid and uniconazole）on the growth of green onion at seedling stage．The results showed that spraying three plant growth regulators could significantly increase the number of roots，stem diameter，seedling strength index and root shoot ratio of green onion seedlings．The plant height of the green onion seedlings treated with cynanchon and uniconazole was significantly decreased，while the plant height of the green onion seedlings treated with naphthylacetic acid was increased．The chlorophyll content and dry weight of the green onion seedlings treated with cynanchon and naphthylacetic acid were increased，while the dry weights of leaves and pseudostems treated with different concentrations of uniconazole were decreased by 7.56%-31.59% and 27.95%-47.33%，respectively，compared to the control at 35 days after treatment．Considering the morphological indexes and dry matter accumulation of the green onion seedlings，the 500 mg·L-1 uniconazole treatment had the best effect on controlling the growth of seedling，and the seedling strength index and root shoot ratio were increased by 111.00% and 91.30% in comparison to the control treatment，respectively．
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Received: 28 July 2023
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