Differential sensitivity to the potential bioherbicide tenuazonic acid probed by the JIP-test based on fast chlorophyll fluorescence kinetics

被引:38
作者
Chen, Shiguo [1 ]
Kang, Ye [1 ]
Zhang, Min [1 ]
Wang, Xiaoxiong [1 ]
Strasser, Reto Joerg [1 ,2 ]
Zhou, Bing [1 ]
Qiang, Sheng [1 ]
机构
[1] Nanjing Agr Univ, Weed Res Lab, Nanjing 210095, Jiangsu, Peoples R China
[2] Univ Geneva, Bioenerget Lab, CH-1254 Geneva, Switzerland
关键词
Phytotoxin; Tolerance; Site of action; Photosynthesis inhibitor; JIP-test; II REACTION-CENTER; PHOTOSYSTEM-II; CHLAMYDOMONAS-REINHARDTII; ALTERNARIA-ALTERNATA; REACTION CENTERS; TRANSIENT; RESISTANCE; HERBICIDE; BINDING; PLANTS;
D O I
10.1016/j.envexpbot.2014.11.009
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Tenuazonic acid (TeA) isolated from the pathogenic fungus Alternaria alternata is a potential photosyn system II (PSII) herbicide effective on many monocotyledonous dicotyledonous plants. Five plant species were selected to evaluate their sensitivity to TeA and to determine if differential binding to the target protein D1 in PSII is a tolerance mechanism. A model, based on both fluorescence parameters PSII performace index PIABS and the variable fluorescence of the J-step V-J,V- is suitable to assess TeA sensitivity in diffrent species. In this model, the K value was confirmed as an indicator of sensitivity to the PSII natural toxin. A high K value associates with higher sensitivity to TeA. The K of three susceptible plants, croftonweed (Ageratina adenophora), common crabgrass (Digitaria sanguinalis) and Arabidopsis thaliana was two to three times greater than that of the tolerant plants, cotton (Gossypium barbadense) and tobacco (Nicotiana tabacum). Analysis of fast Chl a flurescence transients OJIP determined that in the two tolerant species TeA poorly bound to its Q(B) site target site in the D1 protein thus it did not interrupt PSII electron flow beyond Q(A) and did not inactivate PSII reaction centers (RCs). Isotope displacement experiments using [C-14]atrazine and sequencing of D1 and D2 proteins, discarded target site differences and decreased TeA uptake as tolerance mechanisms in cotton and tobacco. Other potential mechanisms limiting TeA from reaching the D1 protein or decreasing its binding affinity to the D1 protein or both are probably involved in the tolerance of cotton and tobacco to the toxin. (C) 2014 Elsevier B.V. All rights reserved.
引用
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页码:1 / 15
页数:15
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