Effects of Two Seed Coating on Corn Growth and Antioxidant Defense System of ‘Heinuo 100’

doi:10.11924/j.issn.1000-6850.casb2023-0142

Abstract

Abstract:

Through field experiment, the research elucidates the effects of two commonly used systemic pesticides (thiamethoxam and difenoconazole) in the corn seed treatment, and their effects on cluster fresh weight in corn milk-ripe stage, fresh weight in all growth stages and the antioxidant defense system of ‘Heinuo 100’. The results showed that at the recommended application dosage of 6 mL/kg seed, the effect of thiamethoxam and thiamethoxan-difenoconazole mixture on the fresh weight of each part of maize plant was mainly at seedling stage and jointing stage. Compared with the control treatment, thiamethoxam and thiamethoxam-difenoconazole mixture treatment significantly reduced the fresh weight of each part at seedling stage and jointing stage, and there was no significant difference among the three treatments at milk maturity stage. The application of systemic pesticides as the seed treatment agents could increase the fresh weight of ear, but the effect was not significantly different. Both thiamethoxam and thiamethoxan-difenoconazole treatment promoted chlorophyll synthesis, and the mixed application of thiamethoxam and difenoconazole had higher chlorophyll content than that of thiamethoxam alone. Compared with the control treatment, thiamethoxam and thiamethoxam-difenoconazole mixture treatment could increase the activities of SOD, CAT and POD and decrease the GSH and MDA content in maize leaves. It showed that anti-oxidative mechanism of the maize leaf could response and regulate the metabolic process of the maize, thus making the corn plant grow normally at the dosages of systemic pesticides employed in this study.

Key words: thiamethoxam, difenoconazole, corn seed treatment, chlorophyll, antioxidant defense system

WU Yitong, LV Chensheng, LIU Yadong, LI Kaiye. Effects of Two Seed Coating on Corn Growth and Antioxidant Defense System of ‘Heinuo 100’[J]. Chinese Agricultural Science Bulletin, 2024, 40(3): 46-53.

Figures/Tables 7

References 26

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供试农药	农药登记证号	剂型	公司
噻虫嗪	PD20160110	悬浮种衣剂	先正达
噻虫嗪-苯醚甲环唑	PD20161551	悬浮种衣剂	先正达

供试农药	农药登记证号	剂型	公司
噻虫嗪	PD20160110	悬浮种衣剂	先正达
噻虫嗪-苯醚甲环唑	PD20161551	悬浮种衣剂	先正达