AUTHOR=Hu Yanbo , Siddiqui Manzer H. , Li Chunming , Jiang Luping , Zhang Heng , Zhao Xiyang 

TITLE=Polyamine Metabolism, Photorespiration, and Excitation Energy Allocation in Photosystem II Are Potentially Regulatory Hubs in Poplar Adaptation to Soil Nitrogen Availability

JOURNAL=Frontiers in Plant Science

VOLUME=Volume 11 - 2020

YEAR=2020

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2020.01271

DOI=10.3389/fpls.2020.01271

ISSN=1664-462X

ABSTRACT=Poplar growth (leaf area) and N utilization significantly increased under fertilized compared to unfertilized conditions; whereas photosynthetic N utilization efficiency significantly decreased under low N supplies. Growth characteristics were better in XQH than BC5 clone under the same N supplies, indicating a higher N utilization efficiency. Leaf absorbed light energy and thermal dissipation fraction were significantly different for XQH clone between conventional and exponential N additions. Leaf concentrations of putrescine (Put) and acetylated Put were significantly higher in exponential than conventional N addition. Photorespiration significantly increased in leaves of XQH clone under exponential compared to conventional N addition. Our results indicate that an interaction of the clone and N supply pattern significantly occurs in poplar growth; leaf expansion and the storage N allocations are the central hubs in regulation of poplar N utilization.