title: Photosynthetic physiological response of Radix Isatidis (Isatis indigotica Fort.) seedlings to nicosulfuron.
abstract: Radix Isatidis (Isatis indigotica Fort.) is one of the most important traditional Chinese medicine plants. However, there is no suitable herbicide used for weed control in Radix Isatidis field during postemergence stage. To explore the safety of sulfonylurea herbicide nicosulfuron on Radix Isatidis (Isatis indigotica Fort.) seedlings and the photosynthetic physiological response of the plant to the herbicide, biological mass, leaf area, photosynthetic pigment content, photosynthetic rate, chlorophyll fluorescence characteristics, and P700 parameters of Radix Isatidis seedlings were analyzed 10 d after nicosulfuron treatment at 5th leaf stage in this greenhouse research. The results showed that biological mass, total chlorophyll, chlorophyll a, and carotenoids content, photosynthetic rate, stomatal conductance, PS II maximum quantum yield, PS II effective quantum yield, PS II electron transport rate, photochemical quenching, maximal P700 change, photochemical quantum yield of PS I, and PS I electron transport rate decreased with increasing herbicide concentrations, whereas initial fluorescence, quantum yield of non-regulated energy dissipation in PS II and quantum yield of non-photochemical energy dissipation due to acceptor side limitation in PS I increased. It suggests that nicosulfuron ≥1 mg L-1 causes the damage of chloroplast, PS II and PS I structure. Electron transport limitations in PS I receptor side, and blocked dark reaction process may be the main cause of the significantly inhibited growth and decreased photosynthetic rate of Radix Isatidis seedlings.
authors.affiliation: Laboratory of Crop Chemical Regulation and Chemical Weed Control, Agronomy College, Shanxi Agricultural University, Taigu, the People's Republic of China.
authors.forename: Xiangyang
authors.initials: X
authors.lastname: Yuan
authors.affiliation: Laboratory of Crop Chemical Regulation and Chemical Weed Control, Agronomy College, Shanxi Agricultural University, Taigu, the People's Republic of China; Institute of Crop Sciences, Shanxi Academy of Agricultural Sciences, Taiyuan, the People's Republic of China.
authors.forename: Liguang
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Laboratory of Crop Chemical Regulation and Chemical Weed Control, Agronomy College, Shanxi Agricultural University, Taigu, the People's Republic of China.
authors.forename: Na
authors.initials: N
authors.lastname: Ning
authors.affiliation: Laboratory of Crop Chemical Regulation and Chemical Weed Control, Agronomy College, Shanxi Agricultural University, Taigu, the People's Republic of China.
authors.forename: Yinyuan
authors.initials: Y
authors.lastname: Wen
authors.affiliation: Laboratory of Crop Chemical Regulation and Chemical Weed Control, Agronomy College, Shanxi Agricultural University, Taigu, the People's Republic of China.
authors.forename: Shuqi
authors.initials: S
authors.lastname: Dong
authors.affiliation: Laboratory of Crop Chemical Regulation and Chemical Weed Control, Agronomy College, Shanxi Agricultural University, Taigu, the People's Republic of China.
authors.forename: Meiqiang
authors.initials: M
authors.lastname: Yin
authors.affiliation: Laboratory of Crop Chemical Regulation and Chemical Weed Control, Agronomy College, Shanxi Agricultural University, Taigu, the People's Republic of China.
authors.forename: Meijun
authors.initials: M
authors.lastname: Guo
authors.affiliation: Laboratory of Crop Chemical Regulation and Chemical Weed Control, Agronomy College, Shanxi Agricultural University, Taigu, the People's Republic of China.
authors.forename: Binqiang
authors.initials: B
authors.lastname: Wang
authors.affiliation: Laboratory of Crop Chemical Regulation and Chemical Weed Control, Agronomy College, Shanxi Agricultural University, Taigu, the People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Feng
authors.affiliation: Laboratory of Crop Chemical Regulation and Chemical Weed Control, Agronomy College, Shanxi Agricultural University, Taigu, the People's Republic of China.
authors.forename: Pingyi
authors.initials: P
authors.lastname: Guo
mesh_terms: D002734:Chlorophyll / Q000031:analogs & derivatives / Q000502:physiology; D004579:Electron Transport / Q000187:drug effects / Q000502:physiology; D031219:Isatis / Q000187:drug effects* / Q000502:physiology; D010788:Photosynthesis / Q000187:drug effects* / Q000502:physiology; D018515:Plant Leaves / Q000187:drug effects / Q000502:physiology; D011725:Pyridines / Q000494:pharmacology*; D036226:Seedlings / Q000187:drug effects* / Q000502:physiology; D013453:Sulfonylurea Compounds / Q000494:pharmacology*
chemical_list: D011725:Pyridines; D013453:Sulfonylurea Compounds; D002734:Chlorophyll; C085815:chlorophyll a'; C416723:nicosulfuron