Analysis of the differences between the leaves and roots of<i>Leymus mollis (Trin.) Hara</i>in their physiological responses to sand burial in the coast of Yantai, China

Ruilian, 周瑞莲 Zhou; Yanhong, 赵彦宏 Zhao; Ruiya, 杨润亚 Yang; Jincheng, 左进城 Zuo; Yueli, 候月立 Hou; Binbin, 周彬彬 Zhou

doi:10.5846/stxb201312172966

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“…Under adverse environments, various reactive oxygen species (H 2 O 2 , -OH and O 2 -) attack the cell membrane structure and biomolecules, resulting in metabolic disorder. The activation of the antioxidant function helps to scavenge ROS and achieves the purpose of survival of the plant by directly acting on the oxygen free radicals and indirectly consuming the free radical-producing intermediate substances [ 39 , 40 ]. Ion transport is the basis of plants' nutrient absorption, mediates the circulation of various ions in plants, and is the precursor of the Ca 2+ signaling pathway, which ultimately participates in antifreeze pathways in plants [ 41 ].…”

Section: Discussionmentioning

confidence: 99%

Extreme environmental adaptation mechanisms of Antarctic bryophytes are mainly the activation of antioxidants, secondary metabolites and photosynthetic pathways

Zhang,

Cao

et al. 2023

BMC Plant Biol

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The environment in Antarctica is characterized by low temperature, intense UVB and few vegetation types. The Pohlia nutans M211 are bryophytes, which are the primary plants in Antarctica and can thrive well in the Antarctic harsh environment. The transcriptional profiling of Pohlia nutans M211 under low temperature and high UVB conditions was analyzed to explore their polar adaptation mechanism in the extreme Antarctic environment by third-generation sequencing and second-generation sequencing. In comparison to earlier second-generation sequencing techniques, a total of 43,101 non-redundant transcripts and 10,532 lncRNA transcripts were obtained, which were longer and more accurate. The analysis results of GO, KEGG, AS (alternative splicing), and WGCNA (weighted gene co-expression network analysis) of DEGs (differentially expressed genes), combined with the biochemical kits revealed that antioxidant, secondary metabolites pathways and photosynthesis were the key adaptive pathways for Pohlia nutans M211 to the Antarctic extreme environment. Furthermore, the low temperature and strong UVB are closely linked for the first time by the gene HY5 (hlongated hypocotyl 5) to form a protein interaction network through the PPI (protein–protein interaction networks) analysis method. The UVR8 module, photosynthetic module, secondary metabolites synthesis module, and temperature response module were the key components of the PPI network. In conclusion, this study will help to further explore the polar adaptation mechanism of Antarctic plants represented by bryophytes and to enrich the polar gene resources.

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Section: Discussionmentioning

confidence: 99%