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Comparative transcriptome analyses revealed photosynthesis- and sucrose metabolism-related responses of endangered evergreen tree species Phoebe bournei (HEMSL.) yang - lauraceae to shade

Author(s)
XINLIANG LIU Jiangxi Academy of Forestry, Jiangxi Nanchang Urban Ecosystem Research Station,Nanchang, Jiangxi,China
YANFANG WU Jiangxi Academy of Forestry, Jiangxi Nanchang Urban Ecosystem Research Station,Nanchang, Jiangxi,China
LIYAN WANG Jiangxi Academy of Forestry, Jiangxi Nanchang Urban Ecosystem Research Station,Nanchang, Jiangxi,China
YUETING ZHANG Jiangxi Academy of Forestry, Jiangxi Nanchang Urban Ecosystem Research Station,Nanchang, Jiangxi,China
XINGLIN TANG Jiangxi Academy of Forestry, Jiangxi Nanchang Urban Ecosystem Research Station,Nanchang, Jiangxi,China
CONG YAN Jiangxi Academy of Forestry, Jiangxi Nanchang Urban Ecosystem Research Station,Nanchang, Jiangxi,China
Abstract
Phoebe bournei (Hemsl.) Yang of the family Lauraceae is an endangered evergreen ornamental tree species. Shade stress greatly affects the growth and development of Phoebe species. To elucidate the molecular mechanisms underlying the shade response, the photosynthesis and transcriptomic profiles of P. bournei were examined under shade stress (11.7% light) and full light. The results showed that shade led to a decrease in the net photosynthetic rate (Pn), stomatal conductance (gs) and transpiration rate (E) of P. bournei plants. The shade treatments resulted in a significant increase in plant height and crown diameter. However, diameter at ground level, leaf mass per area (LMA), and plant biomass were lower for plants grown under shade conditions than under full light. De novo assembly of RNA sequencing (RNA-seq) data resulted in the generation of 89054 unigenes, and a total of 5404 genes were differentially expressed between the shade treatment and full light. The expression of most differentially expressed genes (DEGs) involved in the photosynthesis antenna pathway was upregulated under shade stress. The downregulated expression of most genes associated with photosynthesis was in agreement with the decreased Pn. The expression of many DEGs related to starch and sucrose metabolism was also significantly affected by shade stress. Our findings provide valuable information for understanding the physiological and molecular regulatory pathways of P. bournei in response to shade.
Publication Details
Page(s) 2283-2293
DOI 10.30848/PJB2023-6(28)
Published Journal: Pakistan Journal of Botany, Volume: 55, Issue: 6, Year: 2023

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Keywords
Gas exchange, Plant Growth, Light-shading, Photosynthesis antenna, Starch and sucrose
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