title: Improved tolerance to transplanting injury and chilling stress in rice seedlings treated with orysastrobin.
abstract: In addition to their fungicidal activity, strobilurin-type fungicides are reported to show enhancing effects on crop growth and yield. Previous studies suggested that the fungicide has a mitigating effect on abiotic stresses. However, there are few reports about growth enhancement through abiotic stress alleviation by strobilurin-type fungicides, but the mechanism of action of the growth enhancement is still not clear. The present study revealed that orysastrobin enhanced rice seedling growth after root cutting injury and chilling stress. We also found that orysastrobin decreased the transpiration rate and increased ascorbate peroxidase and glutathione reductase activities. This stress alleviation was eliminated by the application of naproxen, a putative abscisic acid biosynthesis inhibitor. These results suggested that orysastrobin improved tolerance against transplanting injury and chilling stress in rice seedlings by inducing water-retaining activity through the suppression of transpiration, and also by inducing reactive oxygen scavenging activity thus inhibiting reactive oxygen species accumulation.
authors.affiliation: Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Naoto
authors.initials: N
authors.lastname: Takahashi
authors.affiliation: Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Yukari
authors.initials: Y
authors.lastname: Sunohara
authors.affiliation: Agricultural Station, Development and Registration - Crop Protection, BASF Japan Ltd., Tahara, Aichi 441-3413, Japan.
authors.forename: Masami
authors.initials: M
authors.lastname: Fujiwara
authors.affiliation: Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: hmatsu@biol.tsukuba.ac.jp.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Matsumoto
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism; D000222:Adaptation, Physiological / Q000502:physiology*; D000975:Antioxidants / Q000378:metabolism; D060387:Ascorbate Peroxidases / Q000378:metabolism; D044482:Benzeneacetamides / Q000494:pharmacology*; D003080:Cold Temperature; D018525:Germination / Q000187:drug effects; D005980:Glutathione Reductase / Q000187:drug effects / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000378:metabolism; D007097:Imines / Q000494:pharmacology*; D009288:Naproxen / Q000494:pharmacology; D012275:Oryza / Q000187:drug effects* / Q000201:enzymology / Q000254:growth & development; D018526:Plant Transpiration / Q000187:drug effects; D017382:Reactive Oxygen Species / Q000378:metabolism / Q000494:pharmacology; D036226:Seedlings / Q000187:drug effects* / Q000201:enzymology / Q000254:growth & development*; D013312:Stress, Physiological / Q000502:physiology; D000073739:Strobilurins; D014867:Water / Q000737:chemistry
chemical_list: D000975:Antioxidants; D044482:Benzeneacetamides; D007097:Imines; D017382:Reactive Oxygen Species; D000073739:Strobilurins; D014867:Water; D009288:Naproxen; D000040:Abscisic Acid; D006861:Hydrogen Peroxide; D060387:Ascorbate Peroxidases; D005980:Glutathione Reductase; C570345:orysastrobin
keywords: Chilling stress; Orysastrobin; Reactive oxygen species; Transpiration rate; Transplanting injury