Involvement of Hydrogen Peroxide in Cotton Leaf Abscission Induced by Thidiazuron
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Involvement of Hydrogen Peroxide in Cotton Leaf Abscission Induced by Thidiazuron Sijia Li1,2 · Ruixian Liu2,3 · Xiaojing Wang2,3 · Liang Zhao2,3 · Jian Chen4,5 · Changqin Yang2,3 · Guowei Zhang2,3 · Wanchao Ni1,2 · Li Zhang6 Received: 9 August 2019 / Accepted: 7 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Thidiazuron (TDZ) has been extensively applied as chemical defoliant in cotton production, but the physiological mechanisms for its defoliating activity are poorly understood. Hydrogen peroxide (H2O2) is regarded as an endogenous regulator of abscission. In the current study, we found that H2O2 was involved in cotton leaf abscission induced by TDZ. TDZ induced water loss, cell death, and oxidative injury in cotton leaf, leading to significant leaf abscission. TDZ treatment induced a significant increase in H 2O2 production in the leaf, petiole and abscission zone. Treatment with DPI, a respiratory burst oxidase homologue inhibitor, significantly inhibited TDZ-induced H2O2 generation, coinciding with a remarkable decrease in leaf abscission. TDZ treatment stimulated the expression of RbohA in the petiole and pulvinus. These results suggest that H2O2 might play an important role in cotton leaf abscission induced by TDZ. Keywords Hydrogen peroxide · Leaf abscission · Thidiazuron · Cotton
Introduction
Sijia Li and Ruixian Liu contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00344-020-10218-w) contains supplementary material, which is available to authorized users. * Ruixian Liu [email protected] * Jian Chen [email protected] 1
College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, China
2
Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences, Nanjing, China
3
Provincial Key Laboratory of Agrobiology, Jiangsu Academy of Agricultural Sciences, Nanjing, China
4
Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing, China
5
Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, China
6
College of Plant Protection, Shandong Agricultural University, Taian, China
Defoliants and desiccants are classified as harvest aid chemicals because they are commonly used to facilitate mechanical harvesting of crops (Pedersen et al. 2006). It is important to remove cotton foliage prior to harvest to enhance the quality of cotton fiber with less debris during for machine-picking practice (Nickell 1982). Therefore, harvest aids, such as chemical defoliants or desiccants, are currently regarded as essential components of modern cotton production (Du et al. 2013). The removal of leaves before harvesting of the cotton bolls using specific defoliants can facilitate mechanical harvesting and improve the quality of the harvested cotton lint (Suttle 1984). Abscission refers to the detachment of plant organs, such as leaves, flowers, fr
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