Abstract:
The purpose of this present study was to thoroughly analysis the correlation between endogenous hormones in tobacco plants and the level of resistance to tobacco brown spot. Under pot experiment, two tobacco cultivars with different resistance levels, JYH (resistant cultivar) and CBH (sensitive one) were inoculated with tobacco brown spot to check the changes of endogenous hormones due to brown spot infection. The results showed that the contents of endogenous hormones in the two cultivars were influenced by tobacco brown spot infection, and there were obviously different changes in the two cultivars. The abscisic acid (ABA) contents and ethylene (ET) production amount in the two cultivars had a general uptrend in response to tobacco brown spot infection. By contrast, the contents of indole-3-acetic acid (IAA) and cytokinins (CTK) both declined in some degrees. Moreover, tobacco brown spot infection increased the contents of gibberellin (GA) and jasmonate (JA) in JYH, while in CBH, the GA contents increased initially and then declined, and the JA contents continuously declined under stress. Compared with JYH, the content of ABA in CBH increased less, while the contents of GA, IAA, CTK and JA decreased more, and the released amount of ET was higher. In conclusion, the contents and changes of endogenous hormone can reflect the resistance of different varieties to brown spot.
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