腐烂病菌、溃疡病菌侵染早期新疆杨叶片组织光合响应特征的比较

doi:10.11707/j.1001-7488.20210912

Abstract

Abstract:

Objective: In this paper, we studied the photosynthetic response characteristics of Populus alba var. pyramidalis infected with Valsa canker disease and blister canker disease, explored the response differences under the stress of two pathogens, to reveal the pathophysiological mechanism, so as to provide theoretical and experimental basis for the control of poplar canker diseases. Method: In this study, one-year-old P. alba var. pyramidalis saplings were inoculated by V. sordida and Botryosphaeria dothidea pathogens by using a epidermal girdling method, to investigate the physiological responses of the gas-exchange and chlorophyll fluorescence characteristics. The differences of photosynthetic response characteristics and water use efficiency (WUE) were compared between the V. sordida- and B. dothidea-inoculated saplings. Correlations analysis was used to reveal the relationships between the net photosynthetic rate (P_n), stomatal conductance (G_s), transpiration rate (Tr) and C_i(intercellular CO₂ concentration). Result: In 3-9 days after inoculation, V. sordida and B. dothidea significantly inhibited the net photosynthetic rate (P_n), stomatal conductance (G_s), transpiration rate (Tr), F_v/ F_m, Ф_PSⅡ, ETR and q_p of PSⅡ of poplar saplings. Moreover, V. sordida significantly declined the water use efficiency (WUE), but B. dothidea did not affected WUE. V. sordida changed the G_s-C_i relationship in pathogen infected saplings and increased the C_i at a very low level of G_s. V. sordida inhibited the photosynthesis mainly through the non-stomatal limitation pathway. However, B. dothidea did not change the G_s-C_i relationship in pathogen infected saplings, the C_i is positively correlated with G_s and B. dothidea inhibited photosynthesis through stomatal limitation pathway. Conclusion: This study has revealed that the change of F_v/F_m cannot reflect all the environmental stresses that the host plant encountered, and F_v/F_m= 0.75-0.85 is not a good criterion for the disease inspection. There are significantly differences in the photosynthetic, gas-exchange and chlorophyll fluorescence characteristic between B. dothidea and V. sordida canker diseases. Pathogen V. sordida has more severe inhibition on the photosynthesis than pathogen B. dothidea. V. sordida significantly decreases the WUE, while B. dothidea did not change the WUE of poplar saplings, which may be an important physiological reason that poplar Valsa canker disease has more severe damage than Botryosphaeria canker disease does in the arid and semi-arid region of north-west China.

Key words: Populus alba var. pyramidalis, photosynthesis, stomatal limitation, non-stomatal limitation, F_v/F_m, WUE, pathogen

CLC Number:

S714

Junchao Xing,Yinan Zhang,Yan Shi,Jinxin Li,Min Li,Wanna Shen,Li Wang,Jiaping Zhao. Comparisons of Photosynthetic Response and Characteristics in Leaves of Populus alba var. pyramidalis Infected by the Stem Canker Pathogen Valsa sordida and Botryosphaeria dothidea at Early Stage[J]. Scientia Silvae Sinicae, 2021, 57(9): 121-129.

Figures/Tables 7

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References 0

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Comparisons of Photosynthetic Response and Characteristics in Leaves of Populus alba var. pyramidalis Infected by the Stem Canker Pathogen Valsa sordida and Botryosphaeria dothidea at Early Stage

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