Effect of Smut Infection on the Photosynthetic Physiological Characteristics and Related Defense Enzymes of Sugarcane

文献类型： 外文期刊

第一作者： Song, Xiupeng

作者： Song, Xiupeng;Yan, Meixin;Zhang, Xiaoqiu;Zhang, Baoqing;Huang, Xing;Huang, Dongmei;Verma, Krishan K.;Li, Yang-Rui;Mo, Fenglian;Pan, Yangfei;Li, Yang-Rui

作者机构：

关键词： chlorophyll fluorescence efficiency; photosynthetic responses; enzyme activity; sugarcane; smut

期刊名称：LIFE-BASEL （ 影响因子：3.251； ）

ISSN：

年卷期： 2022 年 12 卷 8 期

页码：

收录情况： SCI

摘要： Pathogen infection seriously affects plant development and crop productivity, sometimes causing total crop failure. In this study, artificial stab inoculation was used to inoculate sugarcane smut. The changes in leaf gas exchange, chlorophyll fluorescence variables, and related defense enzyme activities were measured in sugarcane cultivar ROC22 after pathogen infection. The results showed that the net photosynthetic rate (Pn), stomatal conductance (gs), and transpiration rate (Tr) downregulated in the first three days after smut infection and upregulated on the fourth day; intercellular CO2 concentration (Ci) increased in the first three days of smut infection and reduced on the fourth day. The chlorophyll fluorescence parameters, i.e., Fo, Fm, Fv/Fm, Fs, and Fv '/Fm ' decreased at the initial stage of pathogen infection but increased rapidly up to 3 days after smut infection. It can be seen that sugarcane seedlings showed a positive response to pathogen infection. The correlation coefficient relationship between Pn, gs, and Tr reached above 0.800, showing a significant correlation; Ci was positively correlated with Fv '/Fm ' and phi PSII, reaching above 0.800 and showing a significant correlation; Fo positively correlated with Fv/Fm, Fs, and ETR; Fv /Fm was positively correlated with Fv '/Fm '; Fs significantly correlated with Fv '/Fm '; and Fv '/Fm ' positively correlated with phi PSII. After inoculation with smut, the related defense enzymes, i.e., POD, SOD, PPO, and PAL, were increased and upregulated; photosynthetic parameters can be associated with an increase in enzymatic activities. The results of this study will help to further study of the response mechanism to smut in the sugarcane growing period and provide a theoretical reference for sugarcane resistance to smut breeding.

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