Strigolactone Alleviates Herbicide Toxicity via Maintaining Antioxidant Homeostasis in Watermelon ( Citrullus lanatus )

Abid Ali, Guy Kateta Malangisha, Haiyang Yang, Chen Li, Chi Wang, Yubin Yang, Ahmed Mahmoud, Jehanzeb Khan, Jinghua Yang, Zhongyuan Hu and Mingfang Zhang
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Abid Ali: Laboratory of Germplasm Innovation and Molecular Breeding, Department of Horticulture, Zhejiang University, Hangzhou 310029, China
Guy Kateta Malangisha: Laboratory of Germplasm Innovation and Molecular Breeding, Department of Horticulture, Zhejiang University, Hangzhou 310029, China
Haiyang Yang: Laboratory of Germplasm Innovation and Molecular Breeding, Department of Horticulture, Zhejiang University, Hangzhou 310029, China
Chen Li: Laboratory of Germplasm Innovation and Molecular Breeding, Department of Horticulture, Zhejiang University, Hangzhou 310029, China
Chi Wang: Agriculture, Rural Development and Water Conservancy Bureau of Wenling, Wenling 317500, China
Yubin Yang: Agriculture, Rural Development and Water Conservancy Bureau of Wenling, Wenling 317500, China
Ahmed Mahmoud: Laboratory of Germplasm Innovation and Molecular Breeding, Department of Horticulture, Zhejiang University, Hangzhou 310029, China
Jehanzeb Khan: Laboratory of Germplasm Innovation and Molecular Breeding, Department of Horticulture, Zhejiang University, Hangzhou 310029, China
Jinghua Yang: Laboratory of Germplasm Innovation and Molecular Breeding, Department of Horticulture, Zhejiang University, Hangzhou 310029, China
Zhongyuan Hu: Laboratory of Germplasm Innovation and Molecular Breeding, Department of Horticulture, Zhejiang University, Hangzhou 310029, China
Mingfang Zhang: Laboratory of Germplasm Innovation and Molecular Breeding, Department of Horticulture, Zhejiang University, Hangzhou 310029, China

Agriculture, 2021, vol. 11, issue 5, 1-19

Abstract: Strigolactone (SL) plays essential roles in regulating plant growth, development, and stress response. This study was conducted to evaluate the effect of exogenous SL on watermelon resistance against herbicides penoxsulam (PXL) and bensulfuron-methyl (BSM). These herbicides were found to negatively impact watermelon root growth and photosynthetic pigments, probably due to the ultrastructural damage and cell death in leaf and root tissues under herbicide stresses. The activation of SL-related gene expression suggested that the SL pathway may mitigate herbicide toxicity in watermelon. The exogenous SL dose-dependently reversed the PXL- or BSM-induced antioxidant activity, suggesting that SL may participate in maintaining antioxidant enzyme homeostasis under herbicide stresses. The up-regulation of herbicide metabolization and detoxification-related genes (cytochrome P450 and acetolactate synthase) by exogenous SL also in part explained how this phytohormone alleviates herbicide toxicity in watermelon. Our findings will provide valuable information underlying the regulatory effects of SL on herbicide tolerance in Cucurbitaceae crops.

Keywords: strigolactone; herbicides; hydrogen peroxide; antioxidants; ALS; CYP; watermelon (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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