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Physiological and molecular mechanisms of nitrogen in alleviating drought stress in Phoebe bournei
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Physiological and molecular mechanisms of nitrogen in alleviating drought stress in Phoebe bournei
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Journal Article
Physiological and molecular mechanisms of nitrogen in alleviating drought stress in Phoebe bournei
2025
Overview
To explore the mechanisms by which nitrogen alleviates drought stress in
Phoebe bournei
, this study integrated drought treatment with exogenous nitrogen application to assess physiological characteristics and employed transcriptome sequencing to decipher transcriptional responses. The results indicated that nitrogen fertilizer mitigated leaf wilting in
P. bournei
under drought stress and significantly enhanced leaf dry weight, fresh weight, thickness, and chlorophyll content. Furthermore, nitrogen improved photosynthesis by inhibiting stomatal closure, enhancing light energy absorption, and accelerating electron transport in PSII. 11 photosynthesis-related genes, including
PFP, TRY, LQY, FTSH, FRO, CURT, PETF, ATPF, PETA, CRRSP,
and
MEN
and 17 carbohydrate metabolism-associated genes, such as
PWD, GBE1, GAPA, PFKA, RFS, ISA, GLGC, PGK, ALDO, GUX, RX9, MIOX, HCT, BAM, MPFP
, and
ERNI
exhibited differential expression in response to nitrogen. Moreover, nitrogen treatment significantly modulated plant hormone metabolism, with 44 upregulated and 14 downregulated differentially expressed genes (DEGs) primarily associated with jasmonic acid (JA) synthesis and signaling. These findings provide new insights into enhancing the drought tolerance of
P. bournei
in the context of global climate change.
Publisher
Nature Publishing Group UK,Nature Portfolio
