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Photosynthetic responses of oat to leaf blight disease caused by Pantoea agglomerans

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Abstract

The leaf blight disease (LBD) caused by Pantoea agglomerans is a new oat disease in China. In this study, greenhouse experiments were conducted to explore the effect of P. agglomerans on photosynthetic characteristics of oat at different growth stages. Our results showed that the leaf area, chlorophyll relative content (Soil and plant analyzer development, SPAD), net photosynthetic rate (Pn), stomatal conductance (Cs), transpiration rate (Tr), and water use efficiency (WUE) of Avena sativa (B7) and A. nuda (B2) were all significantly (P < 0.05) decreased by LBD after inoculation of P. agglomerans. LBD also inhibited the activity of Rubisco and SBPase. In contrast, oat’s intercellular CO2 concentration (Ci) was increased after inoculation. Furthermore, A. nuda had stronger photosynthesis than A. sativa in all growth stages under inoculation and non-inoculation of P. agglomerans. The photosynthesis ability of oat in the flowering stage was higher than both the jointing and milking stages. Consequently, LBD showed negative influences on photosynthesis characteristics of oat at different growth stages by decreasing the leaf area, SPAD, Pn, Cs, Tr, WUE, and the activity of Rubisco and SBPase.

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Acknowledgements

This study was supported by China Agriculture Research System (CARS-07-C, Oat) and Gansu Provincial Science and Technology Major Projects (No.19ZD2NA002). JFW is thankful for support from USDA-NIFA Multistate Project W4147, and the New Jersey Agricultural Experiment Station.

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Correspondence to Chunjie Li.

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Wang, J., Chen, T., Wei, X. et al. Photosynthetic responses of oat to leaf blight disease caused by Pantoea agglomerans. J Plant Pathol 104, 721–733 (2022). https://doi.org/10.1007/s42161-022-01089-z

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  • DOI: https://doi.org/10.1007/s42161-022-01089-z

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