Effect of Bursaphelenchus xylophilus infection on leaf photosynthetic characteristics and resource-use efficiency of Pinus massoniana

Ecology and Evolution
Ruihe GaoYouqing Luo

Abstract

Pine wilt disease (PWD) is considered as the most destructive forest-invasive alien species in China. We measured gas exchange parameters and foliar carbon isotope ratios (δ13C) of different infection phases of Masson pine in order to investigate the effect of Bursaphelenchus xylophilus infection on photosynthetic responses and resource-use efficiency. The results showed that net photosynthetic rate (Pn), transpiration rate (T), stomatal conductance (gs), and internal CO 2 concentrations (Ci) decreased in the infested trees at photosynthetic photon flux density (PPFD) levels from 0 to 2,000 μmol m-2 s-1 compared with controls. The maximum net photosynthetic rate (Pmax) was significantly declined in the infected trees than in controls (p < .05). There also exist significant differences in dark respiration rate (Rd) among different infection phases (p < .05), but the value is highest in the middle infection phase, followed by the control and then the terminal infection phase. This indicates that Pinus massoniana plants need to consume more photosynthetic products during the middle infection phase in order to defend against pine sawyer beetle feeding and PWD infection. Isotopic analysis revealed a significant decrease of the folia...Continue Reading

References

Sep 24, 2011·Physiologia Plantarum·Paulo C CavatteFábio M DaMatta

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Citations

Apr 21, 2018·Journal of Applied Microbiology·H ChuC Wang
May 11, 2021·Frontiers in Plant Science·Xinggang TangJinchi Zhang
Dec 25, 2021·Frontiers in Plant Science·Ana M RodriguesCarla António

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Methods Mentioned

BETA
environmental stress

Software Mentioned

GraphPad Prism
SPSS

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