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Open AccessArticle

The Changes of Leaf Reflectance Spectrum and Leaf Functional Traits of Osmanthus fragrans Are Related to the Parasitism of Cuscuta japonica

1
Research Center for Urban Forestry, Key Laboratory for Forest Silviculture and Conservation of Ministry of Education, Key Laboratory for Silviculture and Forest Ecosystem Research in Arid- and Semi-arid Region of State Forestry Administration, Beijing Forestry University, Beijing 100083, China
2
College of Forestry, Guangxi University, Nanning 530005, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2021, 11(4), 1937; https://doi.org/10.3390/app11041937
Received: 1 February 2021 / Revised: 14 February 2021 / Accepted: 15 February 2021 / Published: 23 February 2021
Studies on the influence of parasitism on plants based on hyperspectral analysis have not been reported so far. To fully understand the variation characteristics and laws of leaf reflectance spectrum and functional traits after the urban plant parasitized by Cuscuta japonica Choisy. Osmanthus fragrans (Thunb.) Lour. was taken as the research object to analyze the spectral reflectance and functional traits characteristics at different parasitical stages. Results showed that the spectral reflectance was higher than those being parasitized in the visible and near-infrared range. The spectral reflectance in 750~1400 nm was the sensitive range of spectral response of host plant to parasitic infection, which is universal at different parasitic stages. We established a chlorophyll inversion model (y = −65913.323x + 9.783, R2 = 0.6888) based on the reflectance of red valley, which can be used for chlorophyll content of the parasitic Osmanthus fragrans. There was a significant correlation between spectral parameters and chlorophyll content index. Through the change of spectral parameters, we can predict the chlorophyll content of Osmanthus fragrans under different parasitic degrees. After being parasitized, the leaf functional traits of host plant were generally characterized by large leaf thickness, small leaf area, small specific leaf area, low relative chlorophyll content, high leaf dry matter content and high leaf tissue density. These findings indicate that the host plant have adopted a certain trade-off strategy to maintain their growth in the invasion environment of parasitic plants. Therefore, we suspect that the leaf economics spectrum may also exist in the parasitic environment, and there was a general trend toward the “slow investment-return” type in the global leaf economics spectrum. View Full-Text
Keywords: leaf reflectance spectrum; leaf functional traits; leaf economics spectrum; parasitic; Cuscuta japonica Choisy; Osmanthus fragrans leaf reflectance spectrum; leaf functional traits; leaf economics spectrum; parasitic; Cuscuta japonica Choisy; Osmanthus fragrans
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MDPI and ACS Style

Zhu, J.; Xu, Q.; Yao, J.; Zhang, X.; Xu, C. The Changes of Leaf Reflectance Spectrum and Leaf Functional Traits of Osmanthus fragrans Are Related to the Parasitism of Cuscuta japonica. Appl. Sci. 2021, 11, 1937. https://doi.org/10.3390/app11041937

AMA Style

Zhu J, Xu Q, Yao J, Zhang X, Xu C. The Changes of Leaf Reflectance Spectrum and Leaf Functional Traits of Osmanthus fragrans Are Related to the Parasitism of Cuscuta japonica. Applied Sciences. 2021; 11(4):1937. https://doi.org/10.3390/app11041937

Chicago/Turabian Style

Zhu, Jiyou; Xu, Qing; Yao, Jiangming; Zhang, Xinna; Xu, Chengyang. 2021. "The Changes of Leaf Reflectance Spectrum and Leaf Functional Traits of Osmanthus fragrans Are Related to the Parasitism of Cuscuta japonica" Appl. Sci. 11, no. 4: 1937. https://doi.org/10.3390/app11041937

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