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

被引：2

作者：

Xing J. ^{[1
]}

Zhang Y. ^{[1
]}

Shi Y. ^{[2
]}

Li J. ^{[1
]}

Li M. ^{[1
]}

Shen W. ^{[1
]}

Wang L. ^{[3
]}

Zhao J. ^{[1
]}

机构：

[1] Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing

[2] National Academy of Forestry and Grassland Administration, Beijing

[3] Research Institute of Forestry, Chinese Academy of Forestry, Beijing

来源：

Linye Kexue/Scientia Silvae Sinicae | 2021年 / 57卷 / 09期

关键词：

F[!sub]v[!/sub]/F[!sub]m[!/sub; Non-stomatal limitation; Pathogen; Photosynthesis; Populus alba var. pyramidalis; Stomatal limitation; WUE;

D O I：

10.11707/j.1001-7488.20210912

中图分类号：

学科分类号：

摘要：

【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 (Pn), stomatal conductance (Gs), transpiration rate (Tr) and Ci(intercellular CO2 concentration).【Result】 In 3-9 days after inoculation, V. sordida and B. dothidea significantly inhibited the net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr),Fv/ Fm, ФPSⅡ, ETR and qp 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 Gs-Ci relationship in pathogen infected saplings and increased the Ci at a very low level of Gs. V. sordida inhibited the photosynthesis mainly through the non-stomatal limitation pathway. However, B. dothidea did not change the Gs-Ci relationship in pathogen infected saplings, the Ci is positively correlated with Gs and B. dothidea inhibited photosynthesis through stomatal limitation pathway.【Conclusion】This study has revealed that the change of Fv/Fm cannot reflect all the environmental stresses that the host plant encountered, and Fv/Fm= 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. © 2021, Editorial Department of Scientia Silvae Sinicae. All right reserved.

引用

页码：121 / 129

页数：8

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